Package restructure and API changes, several fixes

- More emphasis on `api` package. It now holds database model structs
  from `lmcli/models` (which is now gone) as well as the tool spec,
  call, and result types. `tools.Tool` is now `api.ToolSpec`.
  `api.ChatCompletionClient` was renamed to
  `api.ChatCompletionProvider`.

- Change ChatCompletion interface and implementations to no longer do
  automatic tool call recursion - they simply return a ToolCall message
  which the caller can decide what to do with (e.g. prompt for user
  confirmation before executing)

- `api.ChatCompletionProvider` functions have had their ReplyCallback
  parameter removed, as now they only return a single reply.

- Added a top-level `agent` package, moved the current built-in tools
  implementations under `agent/toolbox`. `tools.ExecuteToolCalls` is now
  `agent.ExecuteToolCalls`.

- Fixed request context handling in openai, google, ollama (use
  `NewRequestWithContext`), cleaned up request cancellation in TUI

- Fix tool call tui persistence bug (we were skipping message with empty
  content)

- Now handle tool calling from TUI layer

TODO:
- Prompt users before executing tool calls
- Automatically send tool results to the model (or make this toggleable)

pkg/agent/toolbox/dir_tree.go

@@ -1,4 +1,4 @@
-package tools
+package toolbox
 
 import (
 	"fmt"
@@ -7,8 +7,8 @@ import (
 	"strconv"
 	"strings"
 
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
-	toolutil "git.mlow.ca/mlow/lmcli/pkg/lmcli/tools/util"
+	toolutil "git.mlow.ca/mlow/lmcli/pkg/agent/toolbox/util"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 )
 
 const TREE_DESCRIPTION = `Retrieve a tree-like view of a directory's contents.
@@ -27,10 +27,10 @@ Example result:
 }
 `
 
-var DirTreeTool = model.Tool{
+var DirTreeTool = api.ToolSpec{
 	Name:        "dir_tree",
 	Description: TREE_DESCRIPTION,
-	Parameters: []model.ToolParameter{
+	Parameters: []api.ToolParameter{
 		{
 			Name:        "relative_path",
 			Type:        "string",
@@ -42,7 +42,7 @@ var DirTreeTool = model.Tool{
 			Description: "Depth of directory recursion. Defaults to 0 (no recursion), maximum of 5.",
 		},
 	},
-	Impl: func(tool *model.Tool, args map[string]interface{}) (string, error) {
+	Impl: func(tool *api.ToolSpec, args map[string]interface{}) (string, error) {
 		var relativeDir string
 		if tmp, ok := args["relative_path"]; ok {
 			relativeDir, ok = tmp.(string)
@@ -76,25 +76,25 @@ var DirTreeTool = model.Tool{
 	},
 }
 
-func tree(path string, depth int) model.CallResult {
+func tree(path string, depth int) api.CallResult {
 	if path == "" {
 		path = "."
 	}
 	ok, reason := toolutil.IsPathWithinCWD(path)
 	if !ok {
-		return model.CallResult{Message: reason}
+		return api.CallResult{Message: reason}
 	}
 
 	var treeOutput strings.Builder
 	treeOutput.WriteString(path + "\n")
 	err := buildTree(&treeOutput, path, "", depth)
 	if err != nil {
-		return model.CallResult{
+		return api.CallResult{
 			Message: err.Error(),
 		}
 	}
 
-	return model.CallResult{Result: treeOutput.String()}
+	return api.CallResult{Result: treeOutput.String()}
 }
 
 func buildTree(output *strings.Builder, path string, prefix string, depth int) error {

pkg/agent/toolbox/file_insert_lines.go

@@ -1,22 +1,22 @@
-package tools
+package toolbox
 
 import (
 	"fmt"
 	"os"
 	"strings"
 
-	toolutil "git.mlow.ca/mlow/lmcli/pkg/lmcli/tools/util"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	toolutil "git.mlow.ca/mlow/lmcli/pkg/agent/toolbox/util"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 )
 
 const FILE_INSERT_LINES_DESCRIPTION = `Insert lines into a file, must specify path.
 
 Make sure your inserts match the flow and indentation of surrounding content.`
 
-var FileInsertLinesTool = model.Tool{
+var FileInsertLinesTool = api.ToolSpec{
 	Name:        "file_insert_lines",
 	Description: FILE_INSERT_LINES_DESCRIPTION,
-	Parameters: []model.ToolParameter{
+	Parameters: []api.ToolParameter{
 		{
 			Name:        "path",
 			Type:        "string",
@@ -36,7 +36,7 @@ var FileInsertLinesTool = model.Tool{
 			Required:    true,
 		},
 	},
-	Impl: func(tool *model.Tool, args map[string]interface{}) (string, error) {
+	Impl: func(tool *api.ToolSpec, args map[string]interface{}) (string, error) {
 		tmp, ok := args["path"]
 		if !ok {
 			return "", fmt.Errorf("path parameter to write_file was not included.")
@@ -72,27 +72,27 @@ var FileInsertLinesTool = model.Tool{
 	},
 }
 
-func fileInsertLines(path string, position int, content string) model.CallResult {
+func fileInsertLines(path string, position int, content string) api.CallResult {
 	ok, reason := toolutil.IsPathWithinCWD(path)
 	if !ok {
-		return model.CallResult{Message: reason}
+		return api.CallResult{Message: reason}
 	}
 
 	// Read the existing file's content
 	data, err := os.ReadFile(path)
 	if err != nil {
 		if !os.IsNotExist(err) {
-			return model.CallResult{Message: fmt.Sprintf("Could not read path: %s", err.Error())}
+			return api.CallResult{Message: fmt.Sprintf("Could not read path: %s", err.Error())}
 		}
 		_, err = os.Create(path)
 		if err != nil {
-			return model.CallResult{Message: fmt.Sprintf("Could not create new file: %s", err.Error())}
+			return api.CallResult{Message: fmt.Sprintf("Could not create new file: %s", err.Error())}
 		}
 		data = []byte{}
 	}
 
 	if position < 1 {
-		return model.CallResult{Message: "start_line cannot be less than 1"}
+		return api.CallResult{Message: "start_line cannot be less than 1"}
 	}
 
 	lines := strings.Split(string(data), "\n")
@@ -107,8 +107,8 @@ func fileInsertLines(path string, position int, content string) model.CallResult
 	// Join the lines and write back to the file
 	err = os.WriteFile(path, []byte(newContent), 0644)
 	if err != nil {
-		return model.CallResult{Message: fmt.Sprintf("Could not write to path: %s", err.Error())}
+		return api.CallResult{Message: fmt.Sprintf("Could not write to path: %s", err.Error())}
 	}
 
-	return model.CallResult{Result: newContent}
+	return api.CallResult{Result: newContent}
 }

pkg/agent/toolbox/file_replace_lines.go

@@ -1,12 +1,12 @@
-package tools
+package toolbox
 
 import (
 	"fmt"
 	"os"
 	"strings"
 
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
-	toolutil "git.mlow.ca/mlow/lmcli/pkg/lmcli/tools/util"
+	toolutil "git.mlow.ca/mlow/lmcli/pkg/agent/toolbox/util"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 )
 
 const FILE_REPLACE_LINES_DESCRIPTION = `Replace or remove a range of lines within a file, must specify path.
@@ -15,10 +15,10 @@ Useful for re-writing snippets/blocks of code or entire functions.
 
 Plan your edits carefully and ensure any new content matches the flow and indentation of surrounding text.`
 
-var FileReplaceLinesTool = model.Tool{
+var FileReplaceLinesTool = api.ToolSpec{
 	Name:        "file_replace_lines",
 	Description: FILE_REPLACE_LINES_DESCRIPTION,
-	Parameters: []model.ToolParameter{
+	Parameters: []api.ToolParameter{
 		{
 			Name:        "path",
 			Type:        "string",
@@ -42,7 +42,7 @@ var FileReplaceLinesTool = model.Tool{
 			Description: `Content to replace specified range. Omit to remove the specified range.`,
 		},
 	},
-	Impl: func(tool *model.Tool, args map[string]interface{}) (string, error) {
+	Impl: func(tool *api.ToolSpec, args map[string]interface{}) (string, error) {
 		tmp, ok := args["path"]
 		if !ok {
 			return "", fmt.Errorf("path parameter to write_file was not included.")
@@ -87,27 +87,27 @@ var FileReplaceLinesTool = model.Tool{
 	},
 }
 
-func fileReplaceLines(path string, startLine int, endLine int, content string) model.CallResult {
+func fileReplaceLines(path string, startLine int, endLine int, content string) api.CallResult {
 	ok, reason := toolutil.IsPathWithinCWD(path)
 	if !ok {
-		return model.CallResult{Message: reason}
+		return api.CallResult{Message: reason}
 	}
 
 	// Read the existing file's content
 	data, err := os.ReadFile(path)
 	if err != nil {
 		if !os.IsNotExist(err) {
-			return model.CallResult{Message: fmt.Sprintf("Could not read path: %s", err.Error())}
+			return api.CallResult{Message: fmt.Sprintf("Could not read path: %s", err.Error())}
 		}
 		_, err = os.Create(path)
 		if err != nil {
-			return model.CallResult{Message: fmt.Sprintf("Could not create new file: %s", err.Error())}
+			return api.CallResult{Message: fmt.Sprintf("Could not create new file: %s", err.Error())}
 		}
 		data = []byte{}
 	}
 
 	if startLine < 1 {
-		return model.CallResult{Message: "start_line cannot be less than 1"}
+		return api.CallResult{Message: "start_line cannot be less than 1"}
 	}
 
 	lines := strings.Split(string(data), "\n")
@@ -126,8 +126,8 @@ func fileReplaceLines(path string, startLine int, endLine int, content string) m
 	// Join the lines and write back to the file
 	err = os.WriteFile(path, []byte(newContent), 0644)
 	if err != nil {
-		return model.CallResult{Message: fmt.Sprintf("Could not write to path: %s", err.Error())}
+		return api.CallResult{Message: fmt.Sprintf("Could not write to path: %s", err.Error())}
 	}
 
-	return model.CallResult{Result: newContent}
+	return api.CallResult{Result: newContent}
 }

pkg/agent/toolbox/read_dir.go

@@ -1,4 +1,4 @@
-package tools
+package toolbox
 
 import (
 	"fmt"
@@ -6,8 +6,8 @@ import (
 	"path/filepath"
 	"strings"
 
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
-	toolutil "git.mlow.ca/mlow/lmcli/pkg/lmcli/tools/util"
+	toolutil "git.mlow.ca/mlow/lmcli/pkg/agent/toolbox/util"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 )
 
 const READ_DIR_DESCRIPTION = `Return the contents of the CWD (current working directory).
@@ -25,17 +25,17 @@ Example result:
 For files, size represents the size of the file, in bytes.
 For directories, size represents the number of entries in that directory.`
 
-var ReadDirTool = model.Tool{
+var ReadDirTool = api.ToolSpec{
 	Name:        "read_dir",
 	Description: READ_DIR_DESCRIPTION,
-	Parameters: []model.ToolParameter{
+	Parameters: []api.ToolParameter{
 		{
 			Name:        "relative_dir",
 			Type:        "string",
 			Description: "If set, read the contents of a directory relative to the current one.",
 		},
 	},
-	Impl: func(tool *model.Tool, args map[string]interface{}) (string, error) {
+	Impl: func(tool *api.ToolSpec, args map[string]interface{}) (string, error) {
 		var relativeDir string
 		tmp, ok := args["relative_dir"]
 		if ok {
@@ -53,18 +53,18 @@ var ReadDirTool = model.Tool{
 	},
 }
 
-func readDir(path string) model.CallResult {
+func readDir(path string) api.CallResult {
 	if path == "" {
 		path = "."
 	}
 	ok, reason := toolutil.IsPathWithinCWD(path)
 	if !ok {
-		return model.CallResult{Message: reason}
+		return api.CallResult{Message: reason}
 	}
 
 	files, err := os.ReadDir(path)
 	if err != nil {
-		return model.CallResult{
+		return api.CallResult{
 			Message: err.Error(),
 		}
 	}
@@ -96,5 +96,5 @@ func readDir(path string) model.CallResult {
 		})
 	}
 
-	return model.CallResult{Result: dirContents}
+	return api.CallResult{Result: dirContents}
 }

pkg/agent/toolbox/read_file.go

@@ -1,12 +1,12 @@
-package tools
+package toolbox
 
 import (
 	"fmt"
 	"os"
 	"strings"
 
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
-	toolutil "git.mlow.ca/mlow/lmcli/pkg/lmcli/tools/util"
+	toolutil "git.mlow.ca/mlow/lmcli/pkg/agent/toolbox/util"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 )
 
 const READ_FILE_DESCRIPTION = `Retrieve the contents of a text file relative to the current working directory.
@@ -21,10 +21,10 @@ Example result:
 	"result": "1\tthe contents\n2\tof the file\n"
 }`
 
-var ReadFileTool = model.Tool{
+var ReadFileTool = api.ToolSpec{
 	Name:        "read_file",
 	Description: READ_FILE_DESCRIPTION,
-	Parameters: []model.ToolParameter{
+	Parameters: []api.ToolParameter{
 		{
 			Name:        "path",
 			Type:        "string",
@@ -33,7 +33,7 @@ var ReadFileTool = model.Tool{
 		},
 	},
 
-	Impl: func(tool *model.Tool, args map[string]interface{}) (string, error) {
+	Impl: func(tool *api.ToolSpec, args map[string]interface{}) (string, error) {
 		tmp, ok := args["path"]
 		if !ok {
 			return "", fmt.Errorf("Path parameter to read_file was not included.")
@@ -51,14 +51,14 @@ var ReadFileTool = model.Tool{
 	},
 }
 
-func readFile(path string) model.CallResult {
+func readFile(path string) api.CallResult {
 	ok, reason := toolutil.IsPathWithinCWD(path)
 	if !ok {
-		return model.CallResult{Message: reason}
+		return api.CallResult{Message: reason}
 	}
 	data, err := os.ReadFile(path)
 	if err != nil {
-		return model.CallResult{Message: fmt.Sprintf("Could not read path: %s", err.Error())}
+		return api.CallResult{Message: fmt.Sprintf("Could not read path: %s", err.Error())}
 	}
 
 	lines := strings.Split(string(data), "\n")
@@ -67,7 +67,7 @@ func readFile(path string) model.CallResult {
 		content.WriteString(fmt.Sprintf("%d\t%s\n", i+1, line))
 	}
 
-	return model.CallResult{
+	return api.CallResult{
 		Result: content.String(),
 	}
 }

pkg/agent/toolbox/write_file.go

@@ -1,11 +1,11 @@
-package tools
+package toolbox
 
 import (
 	"fmt"
 	"os"
 
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
-	toolutil "git.mlow.ca/mlow/lmcli/pkg/lmcli/tools/util"
+	toolutil "git.mlow.ca/mlow/lmcli/pkg/agent/toolbox/util"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 )
 
 const WRITE_FILE_DESCRIPTION = `Write the provided contents to a file relative to the current working directory.
@@ -15,10 +15,10 @@ Example result:
 	"message": "success"
 }`
 
-var WriteFileTool = model.Tool{
+var WriteFileTool = api.ToolSpec{
 	Name:        "write_file",
 	Description: WRITE_FILE_DESCRIPTION,
-	Parameters: []model.ToolParameter{
+	Parameters: []api.ToolParameter{
 		{
 			Name:        "path",
 			Type:        "string",
@@ -32,7 +32,7 @@ var WriteFileTool = model.Tool{
 			Required:    true,
 		},
 	},
-	Impl: func(t *model.Tool, args map[string]interface{}) (string, error) {
+	Impl: func(t *api.ToolSpec, args map[string]interface{}) (string, error) {
 		tmp, ok := args["path"]
 		if !ok {
 			return "", fmt.Errorf("Path parameter to write_file was not included.")
@@ -58,14 +58,14 @@ var WriteFileTool = model.Tool{
 	},
 }
 
-func writeFile(path string, content string) model.CallResult {
+func writeFile(path string, content string) api.CallResult {
 	ok, reason := toolutil.IsPathWithinCWD(path)
 	if !ok {
-		return model.CallResult{Message: reason}
+		return api.CallResult{Message: reason}
 	}
 	err := os.WriteFile(path, []byte(content), 0644)
 	if err != nil {
-		return model.CallResult{Message: fmt.Sprintf("Could not write to path: %s", err.Error())}
+		return api.CallResult{Message: fmt.Sprintf("Could not write to path: %s", err.Error())}
 	}
-	return model.CallResult{}
+	return api.CallResult{}
 }

pkg/agent/tools.go

@@ -0,0 +1,48 @@
+package agent
+
+import (
+	"fmt"
+
+	"git.mlow.ca/mlow/lmcli/pkg/agent/toolbox"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
+)
+
+var AvailableTools map[string]api.ToolSpec = map[string]api.ToolSpec{
+	"dir_tree":           toolbox.DirTreeTool,
+	"read_dir":           toolbox.ReadDirTool,
+	"read_file":          toolbox.ReadFileTool,
+	"write_file":         toolbox.WriteFileTool,
+	"file_insert_lines":  toolbox.FileInsertLinesTool,
+	"file_replace_lines": toolbox.FileReplaceLinesTool,
+}
+
+func ExecuteToolCalls(calls []api.ToolCall, available []api.ToolSpec) ([]api.ToolResult, error) {
+	var toolResults []api.ToolResult
+	for _, call := range calls {
+		var tool *api.ToolSpec
+		for i := range available {
+			if available[i].Name == call.Name {
+				tool = &available[i]
+				break
+			}
+		}
+		if tool == nil {
+			return nil, fmt.Errorf("Requested tool '%s' is not available. Hallucination?", call.Name)
+		}
+
+		// Execute the tool
+		result, err := tool.Impl(tool, call.Parameters)
+		if err != nil {
+			return nil, fmt.Errorf("Tool '%s' error: %v\n", call.Name, err)
+		}
+
+		toolResult := api.ToolResult{
+			ToolCallID: call.ID,
+			ToolName:   call.Name,
+			Result:     result,
+		}
+
+		toolResults = append(toolResults, toolResult)
+	}
+	return toolResults, nil
+}

pkg/api/api.go

@@ -2,35 +2,41 @@ package api
 
 import (
 	"context"
-
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 )
 
-type ReplyCallback func(model.Message)
+type ReplyCallback func(Message)
 
 type Chunk struct {
 	Content    string
 	TokenCount uint
 }
 
-type ChatCompletionClient interface {
+type RequestParameters struct {
+	Model string
+
+	MaxTokens   int
+	Temperature float32
+	TopP        float32
+
+	ToolBag []ToolSpec
+}
+
+type ChatCompletionProvider interface {
 	// CreateChatCompletion requests a response to the provided messages.
 	// Replies are appended to the given replies struct, and the
 	// complete user-facing response is returned as a string.
 	CreateChatCompletion(
 		ctx context.Context,
-		params model.RequestParameters,
-		messages []model.Message,
-		callback ReplyCallback,
-	) (string, error)
+		params RequestParameters,
+		messages []Message,
+	) (*Message, error)
 
 	// Like CreateChageCompletion, except the response is streamed via
 	// the output channel as it's received.
 	CreateChatCompletionStream(
 		ctx context.Context,
-		params model.RequestParameters,
-		messages []model.Message,
-		callback ReplyCallback,
-		output chan<- Chunk,
-	) (string, error)
+		params RequestParameters,
+		messages []Message,
+		chunks chan<- Chunk,
+	) (*Message, error)
 }

pkg/api/conversation.go

@@ -0,0 +1,11 @@
+package api
+
+import "database/sql"
+
+type Conversation struct {
+	ID             uint `gorm:"primaryKey"`
+	ShortName      sql.NullString
+	Title          string
+	SelectedRootID *uint
+	SelectedRoot   *Message `gorm:"foreignKey:SelectedRootID"`
+}

pkg/api/message.go

@@ -1,7 +1,6 @@
-package model
+package api
 
 import (
-	"database/sql"
 	"time"
 )
 
@@ -32,24 +31,6 @@ type Message struct {
 	SelectedReply   *Message `gorm:"foreignKey:SelectedReplyID"`
 }
 
-type Conversation struct {
-	ID             uint `gorm:"primaryKey"`
-	ShortName      sql.NullString
-	Title          string
-	SelectedRootID *uint
-	SelectedRoot   *Message `gorm:"foreignKey:SelectedRootID"`
-}
-
-type RequestParameters struct {
-	Model string
-
-	MaxTokens   int
-	Temperature float32
-	TopP        float32
-
-	ToolBag []Tool
-}
-
 func (m *MessageRole) IsAssistant() bool {
 	switch *m {
 	case MessageRoleAssistant, MessageRoleToolCall:

pkg/api/provider/anthropic/anthropic.go

@@ -11,11 +11,9 @@ import (
 	"strings"
 
 	"git.mlow.ca/mlow/lmcli/pkg/api"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/tools"
 )
 
-func buildRequest(params model.RequestParameters, messages []model.Message) Request {
+func buildRequest(params api.RequestParameters, messages []api.Message) Request {
 	requestBody := Request{
 		Model:       params.Model,
 		Messages:    make([]Message, len(messages)),
@@ -30,7 +28,7 @@ func buildRequest(params model.RequestParameters, messages []model.Message) Requ
 	}
 
 	startIdx := 0
-	if len(messages) > 0 && messages[0].Role == model.MessageRoleSystem {
+	if len(messages) > 0 && messages[0].Role == api.MessageRoleSystem {
 		requestBody.System = messages[0].Content
 		requestBody.Messages = requestBody.Messages[1:]
 		startIdx = 1
@@ -48,7 +46,7 @@ func buildRequest(params model.RequestParameters, messages []model.Message) Requ
 		message := &requestBody.Messages[i]
 
 		switch msg.Role {
-		case model.MessageRoleToolCall:
+		case api.MessageRoleToolCall:
 			message.Role = "assistant"
 			if msg.Content != "" {
 				message.Content = msg.Content
@@ -63,7 +61,7 @@ func buildRequest(params model.RequestParameters, messages []model.Message) Requ
 			} else {
 				message.Content = xmlString
 			}
-		case model.MessageRoleToolResult:
+		case api.MessageRoleToolResult:
 			xmlFuncResults := convertToolResultsToXMLFunctionResult(msg.ToolResults)
 			xmlString, err := xmlFuncResults.XMLString()
 			if err != nil {
@@ -105,26 +103,25 @@ func sendRequest(ctx context.Context, c *AnthropicClient, r Request) (*http.Resp
 
 func (c *AnthropicClient) CreateChatCompletion(
 	ctx context.Context,
-	params model.RequestParameters,
-	messages []model.Message,
-	callback api.ReplyCallback,
-) (string, error) {
+	params api.RequestParameters,
+	messages []api.Message,
+) (*api.Message, error) {
 	if len(messages) == 0 {
-		return "", fmt.Errorf("Can't create completion from no messages")
+		return nil, fmt.Errorf("Can't create completion from no messages")
 	}
 
 	request := buildRequest(params, messages)
 
 	resp, err := sendRequest(ctx, c, request)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	defer resp.Body.Close()
 
 	var response Response
 	err = json.NewDecoder(resp.Body).Decode(&response)
 	if err != nil {
-		return "", fmt.Errorf("failed to decode response: %v", err)
+		return nil, fmt.Errorf("failed to decode response: %v", err)
 	}
 
 	sb := strings.Builder{}
@@ -137,34 +134,28 @@ func (c *AnthropicClient) CreateChatCompletion(
 	}
 
 	for _, content := range response.Content {
-		var reply model.Message
 		switch content.Type {
 		case "text":
-			reply = model.Message{
-				Role:    model.MessageRoleAssistant,
-				Content: content.Text,
-			}
-			sb.WriteString(reply.Content)
+			sb.WriteString(content.Text)
 		default:
-			return "", fmt.Errorf("unsupported message type: %s", content.Type)
-		}
-		if callback != nil {
-			callback(reply)
+			return nil, fmt.Errorf("unsupported message type: %s", content.Type)
 		}
 	}
 
-	return sb.String(), nil
+	return &api.Message{
+		Role:    api.MessageRoleAssistant,
+		Content: sb.String(),
+	}, nil
 }
 
 func (c *AnthropicClient) CreateChatCompletionStream(
 	ctx context.Context,
-	params model.RequestParameters,
-	messages []model.Message,
-	callback api.ReplyCallback,
+	params api.RequestParameters,
+	messages []api.Message,
 	output chan<- api.Chunk,
-) (string, error) {
+) (*api.Message, error) {
 	if len(messages) == 0 {
-		return "", fmt.Errorf("Can't create completion from no messages")
+		return nil, fmt.Errorf("Can't create completion from no messages")
 	}
 
 	request := buildRequest(params, messages)
@@ -172,19 +163,18 @@ func (c *AnthropicClient) CreateChatCompletionStream(
 
 	resp, err := sendRequest(ctx, c, request)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	defer resp.Body.Close()
 
 	sb := strings.Builder{}
 
 	lastMessage := messages[len(messages)-1]
-	continuation := false
 	if messages[len(messages)-1].Role.IsAssistant() {
 		// this is a continuation of a previous assistant reply, so we'll
 		// include its contents in the final result
+		// TODO: handle this at higher level
 		sb.WriteString(lastMessage.Content)
-		continuation = true
 	}
 
 	scanner := bufio.NewScanner(resp.Body)
@@ -200,29 +190,29 @@ func (c *AnthropicClient) CreateChatCompletionStream(
 			var event map[string]interface{}
 			err := json.Unmarshal([]byte(line), &event)
 			if err != nil {
-				return "", fmt.Errorf("failed to unmarshal event data '%s': %v", line, err)
+				return nil, fmt.Errorf("failed to unmarshal event data '%s': %v", line, err)
 			}
 			eventType, ok := event["type"].(string)
 			if !ok {
-				return "", fmt.Errorf("invalid event: %s", line)
+				return nil, fmt.Errorf("invalid event: %s", line)
 			}
 			switch eventType {
 			case "error":
-				return sb.String(), fmt.Errorf("an error occurred: %s", event["error"])
+				return nil, fmt.Errorf("an error occurred: %s", event["error"])
 			default:
-				return sb.String(), fmt.Errorf("unknown event type: %s", eventType)
+				return nil, fmt.Errorf("unknown event type: %s", eventType)
 			}
 		} else if strings.HasPrefix(line, "data:") {
 			data := strings.TrimSpace(strings.TrimPrefix(line, "data:"))
 			var event map[string]interface{}
 			err := json.Unmarshal([]byte(data), &event)
 			if err != nil {
-				return "", fmt.Errorf("failed to unmarshal event data: %v", err)
+				return nil, fmt.Errorf("failed to unmarshal event data: %v", err)
 			}
 
 			eventType, ok := event["type"].(string)
 			if !ok {
-				return "", fmt.Errorf("invalid event type")
+				return nil, fmt.Errorf("invalid event type")
 			}
 
 			switch eventType {
@@ -235,15 +225,15 @@ func (c *AnthropicClient) CreateChatCompletionStream(
 			case "content_block_delta":
 				delta, ok := event["delta"].(map[string]interface{})
 				if !ok {
-					return "", fmt.Errorf("invalid content block delta")
+					return nil, fmt.Errorf("invalid content block delta")
 				}
 				text, ok := delta["text"].(string)
 				if !ok {
-					return "", fmt.Errorf("invalid text delta")
+					return nil, fmt.Errorf("invalid text delta")
 				}
 				sb.WriteString(text)
 				output <- api.Chunk{
-					Content: text,
+					Content:    text,
 					TokenCount: 1,
 				}
 			case "content_block_stop":
@@ -251,7 +241,7 @@ func (c *AnthropicClient) CreateChatCompletionStream(
 			case "message_delta":
 				delta, ok := event["delta"].(map[string]interface{})
 				if !ok {
-					return "", fmt.Errorf("invalid message delta")
+					return nil, fmt.Errorf("invalid message delta")
 				}
 				stopReason, ok := delta["stop_reason"].(string)
 				if ok && stopReason == "stop_sequence" {
@@ -261,67 +251,39 @@ func (c *AnthropicClient) CreateChatCompletionStream(
 
 						start := strings.Index(content, "<function_calls>")
 						if start == -1 {
-							return content, fmt.Errorf("reached </function_calls> stop sequence but no opening tag found")
+							return nil, fmt.Errorf("reached </function_calls> stop sequence but no opening tag found")
 						}
 
 						sb.WriteString(FUNCTION_STOP_SEQUENCE)
 						output <- api.Chunk{
-							Content: FUNCTION_STOP_SEQUENCE,
+							Content:    FUNCTION_STOP_SEQUENCE,
 							TokenCount: 1,
 						}
-
 						funcCallXml := content[start:] + FUNCTION_STOP_SEQUENCE
 
 						var functionCalls XMLFunctionCalls
 						err := xml.Unmarshal([]byte(funcCallXml), &functionCalls)
 						if err != nil {
-							return "", fmt.Errorf("failed to unmarshal function_calls: %v", err)
+							return nil, fmt.Errorf("failed to unmarshal function_calls: %v", err)
 						}
 
-						toolCall := model.Message{
-							Role: model.MessageRoleToolCall,
+						return &api.Message{
+							Role: api.MessageRoleToolCall,
 							// function call xml stripped from content for model interop
 							Content:   strings.TrimSpace(content[:start]),
 							ToolCalls: convertXMLFunctionCallsToToolCalls(functionCalls),
-						}
-
-						toolResults, err := tools.ExecuteToolCalls(toolCall.ToolCalls, params.ToolBag)
-						if err != nil {
-							return "", err
-						}
-
-						toolResult := model.Message{
-							Role:        model.MessageRoleToolResult,
-							ToolResults: toolResults,
-						}
-
-						if callback != nil {
-							callback(toolCall)
-							callback(toolResult)
-						}
-
-						if continuation {
-							messages[len(messages)-1] = toolCall
-						} else {
-							messages = append(messages, toolCall)
-						}
-
-						messages = append(messages, toolResult)
-						return c.CreateChatCompletionStream(ctx, params, messages, callback, output)
+						}, nil
 					}
 				}
 			case "message_stop":
 				// return the completed message
 				content := sb.String()
-				if callback != nil {
-					callback(model.Message{
-						Role:    model.MessageRoleAssistant,
-						Content: content,
-					})
-				}
-				return content, nil
+				return &api.Message{
+					Role:    api.MessageRoleAssistant,
+					Content: content,
+				}, nil
 			case "error":
-				return sb.String(), fmt.Errorf("an error occurred: %s", event["error"])
+				return nil, fmt.Errorf("an error occurred: %s", event["error"])
 			default:
 				fmt.Printf("\nUnrecognized event: %s\n", data)
 			}
@@ -329,8 +291,8 @@ func (c *AnthropicClient) CreateChatCompletionStream(
 	}
 
 	if err := scanner.Err(); err != nil {
-		return "", fmt.Errorf("failed to read response body: %v", err)
+		return nil, fmt.Errorf("failed to read response body: %v", err)
 	}
 
-	return "", fmt.Errorf("unexpected end of stream")
+	return nil, fmt.Errorf("unexpected end of stream")
 }

pkg/api/provider/anthropic/tools.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 	"text/template"
 
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 )
 
 const FUNCTION_STOP_SEQUENCE = "</function_calls>"
@@ -97,7 +97,7 @@ func parseFunctionParametersXML(params string) map[string]interface{} {
 	return ret
 }
 
-func convertToolsToXMLTools(tools []model.Tool) XMLTools {
+func convertToolsToXMLTools(tools []api.ToolSpec) XMLTools {
 	converted := make([]XMLToolDescription, len(tools))
 	for i, tool := range tools {
 		converted[i].ToolName = tool.Name
@@ -117,8 +117,8 @@ func convertToolsToXMLTools(tools []model.Tool) XMLTools {
 	}
 }
 
-func convertXMLFunctionCallsToToolCalls(functionCalls XMLFunctionCalls) []model.ToolCall {
-	toolCalls := make([]model.ToolCall, len(functionCalls.Invoke))
+func convertXMLFunctionCallsToToolCalls(functionCalls XMLFunctionCalls) []api.ToolCall {
+	toolCalls := make([]api.ToolCall, len(functionCalls.Invoke))
 	for i, invoke := range functionCalls.Invoke {
 		toolCalls[i].Name = invoke.ToolName
 		toolCalls[i].Parameters = parseFunctionParametersXML(invoke.Parameters.String)
@@ -126,7 +126,7 @@ func convertXMLFunctionCallsToToolCalls(functionCalls XMLFunctionCalls) []model.
 	return toolCalls
 }
 
-func convertToolCallsToXMLFunctionCalls(toolCalls []model.ToolCall) XMLFunctionCalls {
+func convertToolCallsToXMLFunctionCalls(toolCalls []api.ToolCall) XMLFunctionCalls {
 	converted := make([]XMLFunctionInvoke, len(toolCalls))
 	for i, toolCall := range toolCalls {
 		var params XMLFunctionInvokeParameters
@@ -145,7 +145,7 @@ func convertToolCallsToXMLFunctionCalls(toolCalls []model.ToolCall) XMLFunctionC
 	}
 }
 
-func convertToolResultsToXMLFunctionResult(toolResults []model.ToolResult) XMLFunctionResults {
+func convertToolResultsToXMLFunctionResult(toolResults []api.ToolResult) XMLFunctionResults {
 	converted := make([]XMLFunctionResult, len(toolResults))
 	for i, result := range toolResults {
 		converted[i].ToolName = result.ToolName
@@ -156,11 +156,11 @@ func convertToolResultsToXMLFunctionResult(toolResults []model.ToolResult) XMLFu
 	}
 }
 
-func buildToolsSystemPrompt(tools []model.Tool) string {
+func buildToolsSystemPrompt(tools []api.ToolSpec) string {
 	xmlTools := convertToolsToXMLTools(tools)
 	xmlToolsString, err := xmlTools.XMLString()
 	if err != nil {
-		panic("Could not serialize []model.Tool to XMLTools")
+		panic("Could not serialize []api.Tool to XMLTools")
 	}
 	return TOOL_PREAMBLE + "\n\n" + xmlToolsString + "\n\n" + TOOL_PREAMBLE_FOOTER
 }

pkg/api/provider/google/google.go

@@ -11,11 +11,9 @@ import (
 	"strings"
 
 	"git.mlow.ca/mlow/lmcli/pkg/api"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/tools"
 )
 
-func convertTools(tools []model.Tool) []Tool {
+func convertTools(tools []api.ToolSpec) []Tool {
 	geminiTools := make([]Tool, len(tools))
 	for i, tool := range tools {
 		params := make(map[string]ToolParameter)
@@ -50,7 +48,7 @@ func convertTools(tools []model.Tool) []Tool {
 	return geminiTools
 }
 
-func convertToolCallToGemini(toolCalls []model.ToolCall) []ContentPart {
+func convertToolCallToGemini(toolCalls []api.ToolCall) []ContentPart {
 	converted := make([]ContentPart, len(toolCalls))
 	for i, call := range toolCalls {
 		args := make(map[string]string)
@@ -65,8 +63,8 @@ func convertToolCallToGemini(toolCalls []model.ToolCall) []ContentPart {
 	return converted
 }
 
-func convertToolCallToAPI(functionCalls []FunctionCall) []model.ToolCall {
-	converted := make([]model.ToolCall, len(functionCalls))
+func convertToolCallToAPI(functionCalls []FunctionCall) []api.ToolCall {
+	converted := make([]api.ToolCall, len(functionCalls))
 	for i, call := range functionCalls {
 		params := make(map[string]interface{})
 		for k, v := range call.Args {
@@ -78,7 +76,7 @@ func convertToolCallToAPI(functionCalls []FunctionCall) []model.ToolCall {
 	return converted
 }
 
-func convertToolResultsToGemini(toolResults []model.ToolResult) ([]FunctionResponse, error) {
+func convertToolResultsToGemini(toolResults []api.ToolResult) ([]FunctionResponse, error) {
 	results := make([]FunctionResponse, len(toolResults))
 	for i, result := range toolResults {
 		var obj interface{}
@@ -95,14 +93,14 @@ func convertToolResultsToGemini(toolResults []model.ToolResult) ([]FunctionRespo
 }
 
 func createGenerateContentRequest(
-	params model.RequestParameters,
-	messages []model.Message,
+	params api.RequestParameters,
+	messages []api.Message,
 ) (*GenerateContentRequest, error) {
 	requestContents := make([]Content, 0, len(messages))
 
 	startIdx := 0
 	var system string
-	if len(messages) > 0 && messages[0].Role == model.MessageRoleSystem {
+	if len(messages) > 0 && messages[0].Role == api.MessageRoleSystem {
 		system = messages[0].Content
 		startIdx = 1
 	}
@@ -135,9 +133,9 @@ func createGenerateContentRequest(
 		default:
 			var role string
 			switch m.Role {
-			case model.MessageRoleAssistant:
+			case api.MessageRoleAssistant:
 				role = "model"
-			case model.MessageRoleUser:
+			case api.MessageRoleUser:
 				role = "user"
 			}
 
@@ -183,55 +181,14 @@ func createGenerateContentRequest(
 	return request, nil
 }
 
-func handleToolCalls(
-	params model.RequestParameters,
-	content string,
-	toolCalls []model.ToolCall,
-	callback api.ReplyCallback,
-	messages []model.Message,
-) ([]model.Message, error) {
-	lastMessage := messages[len(messages)-1]
-	continuation := false
-	if lastMessage.Role.IsAssistant() {
-		continuation = true
-	}
-
-	toolCall := model.Message{
-		Role:      model.MessageRoleToolCall,
-		Content:   content,
-		ToolCalls: toolCalls,
-	}
-
-	toolResults, err := tools.ExecuteToolCalls(toolCall.ToolCalls, params.ToolBag)
-	if err != nil {
-		return nil, err
-	}
-
-	toolResult := model.Message{
-		Role:        model.MessageRoleToolResult,
-		ToolResults: toolResults,
-	}
-
-	if callback != nil {
-		callback(toolCall)
-		callback(toolResult)
-	}
-
-	if continuation {
-		messages[len(messages)-1] = toolCall
-	} else {
-		messages = append(messages, toolCall)
-	}
-	messages = append(messages, toolResult)
-
-	return messages, nil
-}
-
-func (c *Client) sendRequest(ctx context.Context, req *http.Request) (*http.Response, error) {
+func (c *Client) sendRequest(req *http.Request) (*http.Response, error) {
 	req.Header.Set("Content-Type", "application/json")
 
 	client := &http.Client{}
-	resp, err := client.Do(req.WithContext(ctx))
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
 
 	if resp.StatusCode != 200 {
 		bytes, _ := io.ReadAll(resp.Body)
@@ -243,42 +200,41 @@ func (c *Client) sendRequest(ctx context.Context, req *http.Request) (*http.Resp
 
 func (c *Client) CreateChatCompletion(
 	ctx context.Context,
-	params model.RequestParameters,
-	messages []model.Message,
-	callback api.ReplyCallback,
-) (string, error) {
+	params api.RequestParameters,
+	messages []api.Message,
+) (*api.Message, error) {
 	if len(messages) == 0 {
-		return "", fmt.Errorf("Can't create completion from no messages")
+		return nil, fmt.Errorf("Can't create completion from no messages")
 	}
 
 	req, err := createGenerateContentRequest(params, messages)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	jsonData, err := json.Marshal(req)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
 	url := fmt.Sprintf(
 		"%s/v1beta/models/%s:generateContent?key=%s",
 		c.BaseURL, params.Model, c.APIKey,
 	)
-	httpReq, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
+	httpReq, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(jsonData))
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
-	resp, err := c.sendRequest(ctx, httpReq)
+	resp, err := c.sendRequest(httpReq)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	defer resp.Body.Close()
 
 	var completionResp GenerateContentResponse
 	err = json.NewDecoder(resp.Body).Decode(&completionResp)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
 	choice := completionResp.Candidates[0]
@@ -301,58 +257,50 @@ func (c *Client) CreateChatCompletion(
 	}
 
 	if len(toolCalls) > 0 {
-		messages, err := handleToolCalls(
-			params, content, convertToolCallToAPI(toolCalls), callback, messages,
-		)
-		if err != nil {
-			return content, err
-		}
-
-		return c.CreateChatCompletion(ctx, params, messages, callback)
+		return &api.Message{
+			Role:      api.MessageRoleToolCall,
+			Content:   content,
+			ToolCalls: convertToolCallToAPI(toolCalls),
+		}, nil
 	}
 
-	if callback != nil {
-		callback(model.Message{
-			Role:    model.MessageRoleAssistant,
-			Content: content,
-		})
-	}
-
-	return content, nil
+	return &api.Message{
+		Role:    api.MessageRoleAssistant,
+		Content: content,
+	}, nil
 }
 
 func (c *Client) CreateChatCompletionStream(
 	ctx context.Context,
-	params model.RequestParameters,
-	messages []model.Message,
-	callback api.ReplyCallback,
+	params api.RequestParameters,
+	messages []api.Message,
 	output chan<- api.Chunk,
-) (string, error) {
+) (*api.Message, error) {
 	if len(messages) == 0 {
-		return "", fmt.Errorf("Can't create completion from no messages")
+		return nil, fmt.Errorf("Can't create completion from no messages")
 	}
 
 	req, err := createGenerateContentRequest(params, messages)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	jsonData, err := json.Marshal(req)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
 	url := fmt.Sprintf(
 		"%s/v1beta/models/%s:streamGenerateContent?key=%s&alt=sse",
 		c.BaseURL, params.Model, c.APIKey,
 	)
-	httpReq, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonData))
+	httpReq, err := http.NewRequestWithContext(ctx, "POST", url, bytes.NewBuffer(jsonData))
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
-	resp, err := c.sendRequest(ctx, httpReq)
+	resp, err := c.sendRequest(httpReq)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	defer resp.Body.Close()
 
@@ -374,7 +322,7 @@ func (c *Client) CreateChatCompletionStream(
 			if err == io.EOF {
 				break
 			}
-			return "", err
+			return nil, err
 		}
 
 		line = bytes.TrimSpace(line)
@@ -387,7 +335,7 @@ func (c *Client) CreateChatCompletionStream(
 		var resp GenerateContentResponse
 		err = json.Unmarshal(line, &resp)
 		if err != nil {
-			return "", err
+			return nil, err
 		}
 
 		tokens := resp.UsageMetadata.CandidatesTokenCount - lastTokenCount
@@ -409,21 +357,15 @@ func (c *Client) CreateChatCompletionStream(
 
 	// If there are function calls, handle them and recurse
 	if len(toolCalls) > 0 {
-		messages, err := handleToolCalls(
-			params, content.String(), convertToolCallToAPI(toolCalls), callback, messages,
-		)
-		if err != nil {
-			return content.String(), err
-		}
-		return c.CreateChatCompletionStream(ctx, params, messages, callback, output)
+		return &api.Message{
+			Role:      api.MessageRoleToolCall,
+			Content:   content.String(),
+			ToolCalls: convertToolCallToAPI(toolCalls),
+		}, nil
 	}
 
-	if callback != nil {
-		callback(model.Message{
-			Role:    model.MessageRoleAssistant,
-			Content: content.String(),
-		})
-	}
-
-	return content.String(), nil
+	return &api.Message{
+		Role:    api.MessageRoleAssistant,
+		Content: content.String(),
+	}, nil
 }

pkg/api/provider/ollama/ollama.go

@@ -11,7 +11,6 @@ import (
 	"strings"
 
 	"git.mlow.ca/mlow/lmcli/pkg/api"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 )
 
 type OllamaClient struct {
@@ -43,8 +42,8 @@ type OllamaResponse struct {
 }
 
 func createOllamaRequest(
-	params model.RequestParameters,
-	messages []model.Message,
+	params api.RequestParameters,
+	messages []api.Message,
 ) OllamaRequest {
 	requestMessages := make([]OllamaMessage, 0, len(messages))
 
@@ -64,11 +63,11 @@ func createOllamaRequest(
 	return request
 }
 
-func (c *OllamaClient) sendRequest(ctx context.Context, req *http.Request) (*http.Response, error) {
+func (c *OllamaClient) sendRequest(req *http.Request) (*http.Response, error) {
 	req.Header.Set("Content-Type", "application/json")
 
 	client := &http.Client{}
-	resp, err := client.Do(req.WithContext(ctx))
+	resp, err := client.Do(req)
 	if err != nil {
 		return nil, err
 	}
@@ -83,12 +82,11 @@ func (c *OllamaClient) sendRequest(ctx context.Context, req *http.Request) (*htt
 
 func (c *OllamaClient) CreateChatCompletion(
 	ctx context.Context,
-	params model.RequestParameters,
-	messages []model.Message,
-	callback api.ReplyCallback,
-) (string, error) {
+	params api.RequestParameters,
+	messages []api.Message,
+) (*api.Message, error) {
 	if len(messages) == 0 {
-		return "", fmt.Errorf("Can't create completion from no messages")
+		return nil, fmt.Errorf("Can't create completion from no messages")
 	}
 
 	req := createOllamaRequest(params, messages)
@@ -96,46 +94,40 @@ func (c *OllamaClient) CreateChatCompletion(
 
 	jsonData, err := json.Marshal(req)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
-	httpReq, err := http.NewRequest("POST", c.BaseURL+"/chat", bytes.NewBuffer(jsonData))
+	httpReq, err := http.NewRequestWithContext(ctx, "POST", c.BaseURL+"/chat", bytes.NewBuffer(jsonData))
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
-	resp, err := c.sendRequest(ctx, httpReq)
+	resp, err := c.sendRequest(httpReq)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	defer resp.Body.Close()
 
 	var completionResp OllamaResponse
 	err = json.NewDecoder(resp.Body).Decode(&completionResp)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
-	content := completionResp.Message.Content
-	if callback != nil {
-		callback(model.Message{
-			Role:    model.MessageRoleAssistant,
-			Content: content,
-		})
-	}
-
-	return content, nil
+	return &api.Message{
+		Role:    api.MessageRoleAssistant,
+		Content: completionResp.Message.Content,
+	}, nil
 }
 
 func (c *OllamaClient) CreateChatCompletionStream(
 	ctx context.Context,
-	params model.RequestParameters,
-	messages []model.Message,
-	callback api.ReplyCallback,
+	params api.RequestParameters,
+	messages []api.Message,
 	output chan<- api.Chunk,
-) (string, error) {
+) (*api.Message, error) {
 	if len(messages) == 0 {
-		return "", fmt.Errorf("Can't create completion from no messages")
+		return nil, fmt.Errorf("Can't create completion from no messages")
 	}
 
 	req := createOllamaRequest(params, messages)
@@ -143,17 +135,17 @@ func (c *OllamaClient) CreateChatCompletionStream(
 
 	jsonData, err := json.Marshal(req)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
-	httpReq, err := http.NewRequest("POST", c.BaseURL+"/chat", bytes.NewBuffer(jsonData))
+	httpReq, err := http.NewRequestWithContext(ctx, "POST", c.BaseURL+"/chat", bytes.NewBuffer(jsonData))
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
-	resp, err := c.sendRequest(ctx, httpReq)
+	resp, err := c.sendRequest(httpReq)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	defer resp.Body.Close()
 
@@ -166,7 +158,7 @@ func (c *OllamaClient) CreateChatCompletionStream(
 			if err == io.EOF {
 				break
 			}
-			return "", err
+			return nil, err
 		}
 
 		line = bytes.TrimSpace(line)
@@ -177,7 +169,7 @@ func (c *OllamaClient) CreateChatCompletionStream(
 		var streamResp OllamaResponse
 		err = json.Unmarshal(line, &streamResp)
 		if err != nil {
-			return "", err
+			return nil, err
 		}
 
 		if len(streamResp.Message.Content) > 0 {
@@ -189,12 +181,8 @@ func (c *OllamaClient) CreateChatCompletionStream(
 		}
 	}
 
-	if callback != nil {
-		callback(model.Message{
-			Role:    model.MessageRoleAssistant,
-			Content: content.String(),
-		})
-	}
-
-	return content.String(), nil
+	return &api.Message{
+		Role:    api.MessageRoleAssistant,
+		Content: content.String(),
+	}, nil
 }

pkg/api/provider/openai/openai.go

@@ -11,11 +11,9 @@ import (
 	"strings"
 
 	"git.mlow.ca/mlow/lmcli/pkg/api"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/tools"
 )
 
-func convertTools(tools []model.Tool) []Tool {
+func convertTools(tools []api.ToolSpec) []Tool {
 	openaiTools := make([]Tool, len(tools))
 	for i, tool := range tools {
 		openaiTools[i].Type = "function"
@@ -47,7 +45,7 @@ func convertTools(tools []model.Tool) []Tool {
 	return openaiTools
 }
 
-func convertToolCallToOpenAI(toolCalls []model.ToolCall) []ToolCall {
+func convertToolCallToOpenAI(toolCalls []api.ToolCall) []ToolCall {
 	converted := make([]ToolCall, len(toolCalls))
 	for i, call := range toolCalls {
 		converted[i].Type = "function"
@@ -60,8 +58,8 @@ func convertToolCallToOpenAI(toolCalls []model.ToolCall) []ToolCall {
 	return converted
 }
 
-func convertToolCallToAPI(toolCalls []ToolCall) []model.ToolCall {
-	converted := make([]model.ToolCall, len(toolCalls))
+func convertToolCallToAPI(toolCalls []ToolCall) []api.ToolCall {
+	converted := make([]api.ToolCall, len(toolCalls))
 	for i, call := range toolCalls {
 		converted[i].ID = call.ID
 		converted[i].Name = call.Function.Name
@@ -71,8 +69,8 @@ func convertToolCallToAPI(toolCalls []ToolCall) []model.ToolCall {
 }
 
 func createChatCompletionRequest(
-	params model.RequestParameters,
-	messages []model.Message,
+	params api.RequestParameters,
+	messages []api.Message,
 ) ChatCompletionRequest {
 	requestMessages := make([]ChatCompletionMessage, 0, len(messages))
 
@@ -117,56 +115,15 @@ func createChatCompletionRequest(
 	return request
 }
 
-func handleToolCalls(
-	params model.RequestParameters,
-	content string,
-	toolCalls []ToolCall,
-	callback api.ReplyCallback,
-	messages []model.Message,
-) ([]model.Message, error) {
-	lastMessage := messages[len(messages)-1]
-	continuation := false
-	if lastMessage.Role.IsAssistant() {
-		continuation = true
-	}
-
-	toolCall := model.Message{
-		Role:      model.MessageRoleToolCall,
-		Content:   content,
-		ToolCalls: convertToolCallToAPI(toolCalls),
-	}
-
-	toolResults, err := tools.ExecuteToolCalls(toolCall.ToolCalls, params.ToolBag)
-	if err != nil {
-		return nil, err
-	}
-
-	toolResult := model.Message{
-		Role:        model.MessageRoleToolResult,
-		ToolResults: toolResults,
-	}
-
-	if callback != nil {
-		callback(toolCall)
-		callback(toolResult)
-	}
-
-	if continuation {
-		messages[len(messages)-1] = toolCall
-	} else {
-		messages = append(messages, toolCall)
-	}
-	messages = append(messages, toolResult)
-
-	return messages, nil
-}
-
-func (c *OpenAIClient) sendRequest(ctx context.Context, req *http.Request) (*http.Response, error) {
+func (c *OpenAIClient) sendRequest(req *http.Request) (*http.Response, error) {
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("Authorization", "Bearer "+c.APIKey)
 
 	client := &http.Client{}
-	resp, err := client.Do(req.WithContext(ctx))
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
 
 	if resp.StatusCode != 200 {
 		bytes, _ := io.ReadAll(resp.Body)
@@ -178,35 +135,34 @@ func (c *OpenAIClient) sendRequest(ctx context.Context, req *http.Request) (*htt
 
 func (c *OpenAIClient) CreateChatCompletion(
 	ctx context.Context,
-	params model.RequestParameters,
-	messages []model.Message,
-	callback api.ReplyCallback,
-) (string, error) {
+	params api.RequestParameters,
+	messages []api.Message,
+) (*api.Message, error) {
 	if len(messages) == 0 {
-		return "", fmt.Errorf("Can't create completion from no messages")
+		return nil, fmt.Errorf("Can't create completion from no messages")
 	}
 
 	req := createChatCompletionRequest(params, messages)
 	jsonData, err := json.Marshal(req)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
-	httpReq, err := http.NewRequest("POST", c.BaseURL+"/chat/completions", bytes.NewBuffer(jsonData))
+	httpReq, err := http.NewRequestWithContext(ctx, "POST", c.BaseURL+"/chat/completions", bytes.NewBuffer(jsonData))
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
-	resp, err := c.sendRequest(ctx, httpReq)
+	resp, err := c.sendRequest(httpReq)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	defer resp.Body.Close()
 
 	var completionResp ChatCompletionResponse
 	err = json.NewDecoder(resp.Body).Decode(&completionResp)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
 	choice := completionResp.Choices[0]
@@ -221,34 +177,27 @@ func (c *OpenAIClient) CreateChatCompletion(
 
 	toolCalls := choice.Message.ToolCalls
 	if len(toolCalls) > 0 {
-		messages, err := handleToolCalls(params, content, toolCalls, callback, messages)
-		if err != nil {
-			return content, err
-		}
-
-		return c.CreateChatCompletion(ctx, params, messages, callback)
+		return &api.Message{
+			Role:      api.MessageRoleToolCall,
+			Content:   content,
+			ToolCalls: convertToolCallToAPI(toolCalls),
+		}, nil
 	}
 
-	if callback != nil {
-		callback(model.Message{
-			Role:    model.MessageRoleAssistant,
-			Content: content,
-		})
-	}
-
-	// Return the user-facing message.
-	return content, nil
+	return &api.Message{
+		Role:    api.MessageRoleAssistant,
+		Content: content,
+	}, nil
 }
 
 func (c *OpenAIClient) CreateChatCompletionStream(
 	ctx context.Context,
-	params model.RequestParameters,
-	messages []model.Message,
-	callback api.ReplyCallback,
+	params api.RequestParameters,
+	messages []api.Message,
 	output chan<- api.Chunk,
-) (string, error) {
+) (*api.Message, error) {
 	if len(messages) == 0 {
-		return "", fmt.Errorf("Can't create completion from no messages")
+		return nil, fmt.Errorf("Can't create completion from no messages")
 	}
 
 	req := createChatCompletionRequest(params, messages)
@@ -256,17 +205,17 @@ func (c *OpenAIClient) CreateChatCompletionStream(
 
 	jsonData, err := json.Marshal(req)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
-	httpReq, err := http.NewRequest("POST", c.BaseURL+"/chat/completions", bytes.NewBuffer(jsonData))
+	httpReq, err := http.NewRequestWithContext(ctx, "POST", c.BaseURL+"/chat/completions", bytes.NewBuffer(jsonData))
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
-	resp, err := c.sendRequest(ctx, httpReq)
+	resp, err := c.sendRequest(httpReq)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	defer resp.Body.Close()
 
@@ -285,7 +234,7 @@ func (c *OpenAIClient) CreateChatCompletionStream(
 			if err == io.EOF {
 				break
 			}
-			return "", err
+			return nil, err
 		}
 
 		line = bytes.TrimSpace(line)
@@ -301,7 +250,7 @@ func (c *OpenAIClient) CreateChatCompletionStream(
 		var streamResp ChatCompletionStreamResponse
 		err = json.Unmarshal(line, &streamResp)
 		if err != nil {
-			return "", err
+			return nil, err
 		}
 
 		delta := streamResp.Choices[0].Delta
@@ -309,7 +258,7 @@ func (c *OpenAIClient) CreateChatCompletionStream(
 			// Construct streamed tool_call arguments
 			for _, tc := range delta.ToolCalls {
 				if tc.Index == nil {
-					return "", fmt.Errorf("Unexpected nil index for streamed tool call.")
+					return nil, fmt.Errorf("Unexpected nil index for streamed tool call.")
 				}
 				if len(toolCalls) <= *tc.Index {
 					toolCalls = append(toolCalls, tc)
@@ -328,21 +277,15 @@ func (c *OpenAIClient) CreateChatCompletionStream(
 	}
 
 	if len(toolCalls) > 0 {
-		messages, err := handleToolCalls(params, content.String(), toolCalls, callback, messages)
-		if err != nil {
-			return content.String(), err
-		}
-
-		// Recurse into CreateChatCompletionStream with the tool call replies
-		return c.CreateChatCompletionStream(ctx, params, messages, callback, output)
-	} else {
-		if callback != nil {
-			callback(model.Message{
-				Role:    model.MessageRoleAssistant,
-				Content: content.String(),
-			})
-		}
+		return &api.Message{
+			Role:      api.MessageRoleToolCall,
+			Content:   content.String(),
+			ToolCalls: convertToolCallToAPI(toolCalls),
+		}, nil
 	}
 
-	return content.String(), nil
+	return &api.Message{
+		Role:    api.MessageRoleAssistant,
+		Content: content.String(),
+	}, nil
 }

pkg/api/tools.go

@@ -1,4 +1,4 @@
-package model
+package api
 
 import (
 	"database/sql/driver"
@@ -6,11 +6,11 @@ import (
 	"fmt"
 )
 
-type Tool struct {
+type ToolSpec struct {
 	Name        string
 	Description string
 	Parameters  []ToolParameter
-	Impl        func(*Tool, map[string]interface{}) (string, error)
+	Impl        func(*ToolSpec, map[string]interface{}) (string, error)
 }
 
 type ToolParameter struct {
@@ -27,6 +27,12 @@ type ToolCall struct {
 	Parameters map[string]interface{} `json:"parameters" yaml:"parameters"`
 }
 
+type ToolResult struct {
+	ToolCallID string `json:"toolCallID" yaml:"-"`
+	ToolName   string `json:"toolName,omitempty" yaml:"tool"`
+	Result     string `json:"result,omitempty" yaml:"result"`
+}
+
 type ToolCalls []ToolCall
 
 func (tc *ToolCalls) Scan(value any) (err error) {
@@ -50,12 +56,6 @@ func (tc ToolCalls) Value() (driver.Value, error) {
 	return string(jsonBytes), nil
 }
 
-type ToolResult struct {
-	ToolCallID string `json:"toolCallID" yaml:"-"`
-	ToolName   string `json:"toolName,omitempty" yaml:"tool"`
-	Result     string `json:"result,omitempty" yaml:"result"`
-}
-
 type ToolResults []ToolResult
 
 func (tr *ToolResults) Scan(value any) (err error) {

pkg/cmd/continue.go

@@ -4,9 +4,9 @@ import (
 	"fmt"
 	"strings"
 
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
 	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 	"github.com/spf13/cobra"
 )
 
@@ -36,7 +36,7 @@ func ContinueCmd(ctx *lmcli.Context) *cobra.Command {
 			}
 
 			lastMessage := &messages[len(messages)-1]
-			if lastMessage.Role != model.MessageRoleAssistant {
+			if lastMessage.Role != api.MessageRoleAssistant {
 				return fmt.Errorf("the last message in the conversation is not an assistant message")
 			}
 
@@ -50,7 +50,7 @@ func ContinueCmd(ctx *lmcli.Context) *cobra.Command {
 			}
 
 			// Append the new response to the original message
-			lastMessage.Content += strings.TrimRight(continuedOutput, "\n\t ")
+			lastMessage.Content += strings.TrimRight(continuedOutput.Content, "\n\t ")
 
 			// Update the original message
 			err = ctx.Store.UpdateMessage(lastMessage)

pkg/cmd/edit.go

@@ -3,9 +3,9 @@ package cmd
 import (
 	"fmt"
 
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
 	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 	"github.com/spf13/cobra"
 )
 
@@ -53,10 +53,10 @@ func EditCmd(ctx *lmcli.Context) *cobra.Command {
 
 			role, _ := cmd.Flags().GetString("role")
 			if role != "" {
-				if role != string(model.MessageRoleUser) && role != string(model.MessageRoleAssistant) {
+				if role != string(api.MessageRoleUser) && role != string(api.MessageRoleAssistant) {
 					return fmt.Errorf("Invalid role specified. Please use 'user' or 'assistant'.")
 				}
-				toEdit.Role = model.MessageRole(role)
+				toEdit.Role = api.MessageRole(role)
 			}
 
 			// Update the message in-place

pkg/cmd/new.go

@@ -3,9 +3,9 @@ package cmd
 import (
 	"fmt"
 
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
 	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 	"github.com/spf13/cobra"
 )
 
@@ -20,19 +20,19 @@ func NewCmd(ctx *lmcli.Context) *cobra.Command {
 				return fmt.Errorf("No message was provided.")
 			}
 
-			var messages []model.Message
+			var messages []api.Message
 
 			// TODO: probably just make this part of the conversation
 			system := ctx.GetSystemPrompt()
 			if system != "" {
-				messages = append(messages, model.Message{
-					Role:    model.MessageRoleSystem,
+				messages = append(messages, api.Message{
+					Role:    api.MessageRoleSystem,
 					Content: system,
 				})
 			}
 
-			messages = append(messages, model.Message{
-				Role:    model.MessageRoleUser,
+			messages = append(messages, api.Message{
+				Role:    api.MessageRoleUser,
 				Content: input,
 			})
 

pkg/cmd/prompt.go

@@ -3,9 +3,9 @@ package cmd
 import (
 	"fmt"
 
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
 	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 	"github.com/spf13/cobra"
 )
 
@@ -20,19 +20,19 @@ func PromptCmd(ctx *lmcli.Context) *cobra.Command {
 				return fmt.Errorf("No message was provided.")
 			}
 
-			var messages []model.Message
+			var messages []api.Message
 
 			// TODO: stop supplying system prompt as a message
 			system := ctx.GetSystemPrompt()
 			if system != "" {
-				messages = append(messages, model.Message{
-					Role:    model.MessageRoleSystem,
+				messages = append(messages, api.Message{
+					Role:    api.MessageRoleSystem,
 					Content: system,
 				})
 			}
 
-			messages = append(messages, model.Message{
-				Role:    model.MessageRoleUser,
+			messages = append(messages, api.Message{
+				Role:    api.MessageRoleUser,
 				Content: input,
 			})
 

pkg/cmd/remove.go

@@ -4,9 +4,9 @@ import (
 	"fmt"
 	"strings"
 
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
 	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 	"github.com/spf13/cobra"
 )
 
@@ -23,7 +23,7 @@ func RemoveCmd(ctx *lmcli.Context) *cobra.Command {
 			return nil
 		},
 		RunE: func(cmd *cobra.Command, args []string) error {
-			var toRemove []*model.Conversation
+			var toRemove []*api.Conversation
 			for _, shortName := range args {
 				conversation := cmdutil.LookupConversation(ctx, shortName)
 				toRemove = append(toRemove, conversation)

pkg/cmd/reply.go

@@ -3,9 +3,9 @@ package cmd
 import (
 	"fmt"
 
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
 	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 	"github.com/spf13/cobra"
 )
 
@@ -30,8 +30,8 @@ func ReplyCmd(ctx *lmcli.Context) *cobra.Command {
 				return fmt.Errorf("No reply was provided.")
 			}
 
-			cmdutil.HandleConversationReply(ctx, conversation, true, model.Message{
-				Role:    model.MessageRoleUser,
+			cmdutil.HandleConversationReply(ctx, conversation, true, api.Message{
+				Role:    api.MessageRoleUser,
 				Content: reply,
 			})
 			return nil

pkg/cmd/retry.go

@@ -3,9 +3,9 @@ package cmd
 import (
 	"fmt"
 
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
 	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 	"github.com/spf13/cobra"
 )
 
@@ -43,11 +43,11 @@ func RetryCmd(ctx *lmcli.Context) *cobra.Command {
 			retryFromIdx := len(messages) - 1 - offset
 
 			// decrease retryFromIdx until we hit a user message
-			for retryFromIdx >= 0 && messages[retryFromIdx].Role != model.MessageRoleUser {
+			for retryFromIdx >= 0 && messages[retryFromIdx].Role != api.MessageRoleUser {
 				retryFromIdx--
 			}
 
-			if messages[retryFromIdx].Role != model.MessageRoleUser {
+			if messages[retryFromIdx].Role != api.MessageRoleUser {
 				return fmt.Errorf("No user messages to retry")
 			}
 

pkg/cmd/util/util.go

@@ -10,36 +10,36 @@ import (
 
 	"git.mlow.ca/mlow/lmcli/pkg/api"
 	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 	"git.mlow.ca/mlow/lmcli/pkg/util"
 	"github.com/charmbracelet/lipgloss"
 )
 
 // Prompt prompts the configured the configured model and streams the response
 // to stdout. Returns all model reply messages.
-func Prompt(ctx *lmcli.Context, messages []model.Message, callback func(model.Message)) (string, error) {
-	content := make(chan api.Chunk) // receives the reponse from LLM
-	defer close(content)
-
-	// render all content received over the channel
-	go ShowDelayedContent(content)
-
+func Prompt(ctx *lmcli.Context, messages []api.Message, callback func(api.Message)) (*api.Message, error) {
 	m, provider, err := ctx.GetModelProvider(*ctx.Config.Defaults.Model)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 
-	requestParams := model.RequestParameters{
+	requestParams := api.RequestParameters{
 		Model:       m,
 		MaxTokens:   *ctx.Config.Defaults.MaxTokens,
 		Temperature: *ctx.Config.Defaults.Temperature,
 		ToolBag:     ctx.EnabledTools,
 	}
 
-	response, err := provider.CreateChatCompletionStream(
-		context.Background(), requestParams, messages, callback, content,
+	content := make(chan api.Chunk)
+	defer close(content)
+
+	// render the content received over the channel
+	go ShowDelayedContent(content)
+
+	reply, err := provider.CreateChatCompletionStream(
+		context.Background(), requestParams, messages, content,
 	)
-	if response != "" {
+
+	if reply.Content != "" {
 		// there was some content, so break to a new line after it
 		fmt.Println()
 
@@ -48,12 +48,12 @@ func Prompt(ctx *lmcli.Context, messages []model.Message, callback func(model.Me
 			err = nil
 		}
 	}
-	return response, err
+	return reply, err
 }
 
 // lookupConversation either returns the conversation found by the
 // short name or exits the program
-func LookupConversation(ctx *lmcli.Context, shortName string) *model.Conversation {
+func LookupConversation(ctx *lmcli.Context, shortName string) *api.Conversation {
 	c, err := ctx.Store.ConversationByShortName(shortName)
 	if err != nil {
 		lmcli.Fatal("Could not lookup conversation: %v\n", err)
@@ -64,7 +64,7 @@ func LookupConversation(ctx *lmcli.Context, shortName string) *model.Conversatio
 	return c
 }
 
-func LookupConversationE(ctx *lmcli.Context, shortName string) (*model.Conversation, error) {
+func LookupConversationE(ctx *lmcli.Context, shortName string) (*api.Conversation, error) {
 	c, err := ctx.Store.ConversationByShortName(shortName)
 	if err != nil {
 		return nil, fmt.Errorf("Could not lookup conversation: %v", err)
@@ -75,7 +75,7 @@ func LookupConversationE(ctx *lmcli.Context, shortName string) (*model.Conversat
 	return c, nil
 }
 
-func HandleConversationReply(ctx *lmcli.Context, c *model.Conversation, persist bool, toSend ...model.Message) {
+func HandleConversationReply(ctx *lmcli.Context, c *api.Conversation, persist bool, toSend ...api.Message) {
 	messages, err := ctx.Store.PathToLeaf(c.SelectedRoot)
 	if err != nil {
 		lmcli.Fatal("Could not load messages: %v\n", err)
@@ -85,7 +85,7 @@ func HandleConversationReply(ctx *lmcli.Context, c *model.Conversation, persist
 
 // handleConversationReply handles sending messages to an existing
 // conversation, optionally persisting both the sent replies and responses.
-func HandleReply(ctx *lmcli.Context, to *model.Message, persist bool, messages ...model.Message) {
+func HandleReply(ctx *lmcli.Context, to *api.Message, persist bool, messages ...api.Message) {
 	if to == nil {
 		lmcli.Fatal("Can't prompt from an empty message.")
 	}
@@ -97,7 +97,7 @@ func HandleReply(ctx *lmcli.Context, to *model.Message, persist bool, messages .
 
 	RenderConversation(ctx, append(existing, messages...), true)
 
-	var savedReplies []model.Message
+	var savedReplies []api.Message
 	if persist && len(messages) > 0 {
 		savedReplies, err = ctx.Store.Reply(to, messages...)
 		if err != nil {
@@ -106,15 +106,15 @@ func HandleReply(ctx *lmcli.Context, to *model.Message, persist bool, messages .
 	}
 
 	// render a message header with no contents
-	RenderMessage(ctx, (&model.Message{Role: model.MessageRoleAssistant}))
+	RenderMessage(ctx, (&api.Message{Role: api.MessageRoleAssistant}))
 
-	var lastSavedMessage *model.Message
+	var lastSavedMessage *api.Message
 	lastSavedMessage = to
 	if len(savedReplies) > 0 {
 		lastSavedMessage = &savedReplies[len(savedReplies)-1]
 	}
 
-	replyCallback := func(reply model.Message) {
+	replyCallback := func(reply api.Message) {
 		if !persist {
 			return
 		}
@@ -131,16 +131,16 @@ func HandleReply(ctx *lmcli.Context, to *model.Message, persist bool, messages .
 	}
 }
 
-func FormatForExternalPrompt(messages []model.Message, system bool) string {
+func FormatForExternalPrompt(messages []api.Message, system bool) string {
 	sb := strings.Builder{}
 	for _, message := range messages {
 		if message.Content == "" {
 			continue
 		}
 		switch message.Role {
-		case model.MessageRoleAssistant, model.MessageRoleToolCall:
+		case api.MessageRoleAssistant, api.MessageRoleToolCall:
 			sb.WriteString("Assistant:\n\n")
-		case model.MessageRoleUser:
+		case api.MessageRoleUser:
 			sb.WriteString("User:\n\n")
 		default:
 			continue
@@ -150,7 +150,7 @@ func FormatForExternalPrompt(messages []model.Message, system bool) string {
 	return sb.String()
 }
 
-func GenerateTitle(ctx *lmcli.Context, messages []model.Message) (string, error) {
+func GenerateTitle(ctx *lmcli.Context, messages []api.Message) (string, error) {
 	const systemPrompt = `You will be shown a conversation between a user and an AI assistant. Your task is to generate a short title (8 words or less) for the provided conversation that reflects the conversation's topic. Your response is expected to be in JSON in the format shown below.
 
 Example conversation:
@@ -177,28 +177,32 @@ Example response:
 		return "", err
 	}
 
-	generateRequest := []model.Message{
+	generateRequest := []api.Message{
 		{
-			Role:    model.MessageRoleSystem,
+			Role:    api.MessageRoleSystem,
 			Content: systemPrompt,
 		},
 		{
-			Role:    model.MessageRoleUser,
+			Role:    api.MessageRoleUser,
 			Content: string(conversation),
 		},
 	}
 
-	m, provider, err := ctx.GetModelProvider(*ctx.Config.Conversations.TitleGenerationModel)
+	m, provider, err := ctx.GetModelProvider(
+		*ctx.Config.Conversations.TitleGenerationModel,
+	)
 	if err != nil {
 		return "", err
 	}
 
-	requestParams := model.RequestParameters{
+	requestParams := api.RequestParameters{
 		Model:     m,
 		MaxTokens: 25,
 	}
 
-	response, err := provider.CreateChatCompletion(context.Background(), requestParams, generateRequest, nil)
+	response, err := provider.CreateChatCompletion(
+		context.Background(), requestParams, generateRequest,
+	)
 	if err != nil {
 		return "", err
 	}
@@ -207,7 +211,7 @@ Example response:
 	var jsonResponse struct {
 		Title string `json:"title"`
 	}
-	err = json.Unmarshal([]byte(response), &jsonResponse)
+	err = json.Unmarshal([]byte(response.Content), &jsonResponse)
 	if err != nil {
 		return "", err
 	}
@@ -272,7 +276,7 @@ func ShowDelayedContent(content <-chan api.Chunk) {
 // RenderConversation renders the given messages to TTY, with optional space
 // for a subsequent message. spaceForResponse controls how many '\n' characters
 // are printed immediately after the final message (1 if false, 2 if true)
-func RenderConversation(ctx *lmcli.Context, messages []model.Message, spaceForResponse bool) {
+func RenderConversation(ctx *lmcli.Context, messages []api.Message, spaceForResponse bool) {
 	l := len(messages)
 	for i, message := range messages {
 		RenderMessage(ctx, &message)
@@ -283,7 +287,7 @@ func RenderConversation(ctx *lmcli.Context, messages []model.Message, spaceForRe
 	}
 }
 
-func RenderMessage(ctx *lmcli.Context, m *model.Message) {
+func RenderMessage(ctx *lmcli.Context, m *api.Message) {
 	var messageAge string
 	if m.CreatedAt.IsZero() {
 		messageAge = "now"
@@ -295,11 +299,11 @@ func RenderMessage(ctx *lmcli.Context, m *model.Message) {
 	headerStyle := lipgloss.NewStyle().Bold(true)
 
 	switch m.Role {
-	case model.MessageRoleSystem:
+	case api.MessageRoleSystem:
 		headerStyle = headerStyle.Foreground(lipgloss.Color("9")) // bright red
-	case model.MessageRoleUser:
+	case api.MessageRoleUser:
 		headerStyle = headerStyle.Foreground(lipgloss.Color("10")) // bright green
-	case model.MessageRoleAssistant:
+	case api.MessageRoleAssistant:
 		headerStyle = headerStyle.Foreground(lipgloss.Color("12")) // bright blue
 	}
 

pkg/cmd/view.go

@@ -20,7 +20,7 @@ func ViewCmd(ctx *lmcli.Context) *cobra.Command {
 			}
 			return nil
 		},
-		RunE: func(cmd *cobra.Command, args []string)  error {
+		RunE: func(cmd *cobra.Command, args []string) error {
 			shortName := args[0]
 			conversation := cmdutil.LookupConversation(ctx, shortName)
 

pkg/lmcli/lmcli.go

@@ -6,13 +6,12 @@ import (
 	"path/filepath"
 	"strings"
 
+	"git.mlow.ca/mlow/lmcli/pkg/agent"
 	"git.mlow.ca/mlow/lmcli/pkg/api"
 	"git.mlow.ca/mlow/lmcli/pkg/api/provider/anthropic"
 	"git.mlow.ca/mlow/lmcli/pkg/api/provider/google"
 	"git.mlow.ca/mlow/lmcli/pkg/api/provider/ollama"
 	"git.mlow.ca/mlow/lmcli/pkg/api/provider/openai"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/tools"
 	"git.mlow.ca/mlow/lmcli/pkg/util"
 	"git.mlow.ca/mlow/lmcli/pkg/util/tty"
 	"gorm.io/driver/sqlite"
@@ -24,7 +23,7 @@ type Context struct {
 	Store  ConversationStore
 
 	Chroma       *tty.ChromaHighlighter
-	EnabledTools []model.Tool
+	EnabledTools []api.ToolSpec
 
 	SystemPromptFile string
 }
@@ -50,9 +49,9 @@ func NewContext() (*Context, error) {
 
 	chroma := tty.NewChromaHighlighter("markdown", *config.Chroma.Formatter, *config.Chroma.Style)
 
-	var enabledTools []model.Tool
+	var enabledTools []api.ToolSpec
 	for _, toolName := range config.Tools.EnabledTools {
-		tool, ok := tools.AvailableTools[toolName]
+		tool, ok := agent.AvailableTools[toolName]
 		if ok {
 			enabledTools = append(enabledTools, tool)
 		}
@@ -79,7 +78,7 @@ func (c *Context) GetModels() (models []string) {
 	return
 }
 
-func (c *Context) GetModelProvider(model string) (string, api.ChatCompletionClient, error) {
+func (c *Context) GetModelProvider(model string) (string, api.ChatCompletionProvider, error) {
 	parts := strings.Split(model, "@")
 
 	var provider string

pkg/lmcli/store.go

@@ -8,32 +8,32 @@ import (
 	"strings"
 	"time"
 
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	sqids "github.com/sqids/sqids-go"
 	"gorm.io/gorm"
 )
 
 type ConversationStore interface {
-	ConversationByShortName(shortName string) (*model.Conversation, error)
+	ConversationByShortName(shortName string) (*api.Conversation, error)
 	ConversationShortNameCompletions(search string) []string
-	RootMessages(conversationID uint) ([]model.Message, error)
-	LatestConversationMessages() ([]model.Message, error)
+	RootMessages(conversationID uint) ([]api.Message, error)
+	LatestConversationMessages() ([]api.Message, error)
 
-	StartConversation(messages ...model.Message) (*model.Conversation, []model.Message, error)
-	UpdateConversation(conversation *model.Conversation) error
-	DeleteConversation(conversation *model.Conversation) error
-	CloneConversation(toClone model.Conversation) (*model.Conversation, uint, error)
+	StartConversation(messages ...api.Message) (*api.Conversation, []api.Message, error)
+	UpdateConversation(conversation *api.Conversation) error
+	DeleteConversation(conversation *api.Conversation) error
+	CloneConversation(toClone api.Conversation) (*api.Conversation, uint, error)
 
-	MessageByID(messageID uint) (*model.Message, error)
-	MessageReplies(messageID uint) ([]model.Message, error)
+	MessageByID(messageID uint) (*api.Message, error)
+	MessageReplies(messageID uint) ([]api.Message, error)
 
-	UpdateMessage(message *model.Message) error
-	DeleteMessage(message *model.Message, prune bool) error
-	CloneBranch(toClone model.Message) (*model.Message, uint, error)
-	Reply(to *model.Message, messages ...model.Message) ([]model.Message, error)
+	UpdateMessage(message *api.Message) error
+	DeleteMessage(message *api.Message, prune bool) error
+	CloneBranch(toClone api.Message) (*api.Message, uint, error)
+	Reply(to *api.Message, messages ...api.Message) ([]api.Message, error)
 
-	PathToRoot(message *model.Message) ([]model.Message, error)
-	PathToLeaf(message *model.Message) ([]model.Message, error)
+	PathToRoot(message *api.Message) ([]api.Message, error)
+	PathToLeaf(message *api.Message) ([]api.Message, error)
 }
 
 type SQLStore struct {
@@ -43,8 +43,8 @@ type SQLStore struct {
 
 func NewSQLStore(db *gorm.DB) (*SQLStore, error) {
 	models := []any{
-		&model.Conversation{},
-		&model.Message{},
+		&api.Conversation{},
+		&api.Message{},
 	}
 
 	for _, x := range models {
@@ -58,9 +58,9 @@ func NewSQLStore(db *gorm.DB) (*SQLStore, error) {
 	return &SQLStore{db, _sqids}, nil
 }
 
-func (s *SQLStore) createConversation() (*model.Conversation, error) {
+func (s *SQLStore) createConversation() (*api.Conversation, error) {
 	// Create the new conversation
-	c := &model.Conversation{}
+	c := &api.Conversation{}
 	err := s.db.Save(c).Error
 	if err != nil {
 		return nil, err
@@ -75,28 +75,28 @@ func (s *SQLStore) createConversation() (*model.Conversation, error) {
 	return c, nil
 }
 
-func (s *SQLStore) UpdateConversation(c *model.Conversation) error {
+func (s *SQLStore) UpdateConversation(c *api.Conversation) error {
 	if c == nil || c.ID == 0 {
 		return fmt.Errorf("Conversation is nil or invalid (missing ID)")
 	}
 	return s.db.Updates(c).Error
 }
 
-func (s *SQLStore) DeleteConversation(c *model.Conversation) error {
+func (s *SQLStore) DeleteConversation(c *api.Conversation) error {
 	// Delete messages first
-	err := s.db.Where("conversation_id = ?", c.ID).Delete(&model.Message{}).Error
+	err := s.db.Where("conversation_id = ?", c.ID).Delete(&api.Message{}).Error
 	if err != nil {
 		return err
 	}
 	return s.db.Delete(c).Error
 }
 
-func (s *SQLStore) DeleteMessage(message *model.Message, prune bool) error {
+func (s *SQLStore) DeleteMessage(message *api.Message, prune bool) error {
 	panic("Not yet implemented")
 	//return s.db.Delete(&message).Error
 }
 
-func (s *SQLStore) UpdateMessage(m *model.Message) error {
+func (s *SQLStore) UpdateMessage(m *api.Message) error {
 	if m == nil || m.ID == 0 {
 		return fmt.Errorf("Message is nil or invalid (missing ID)")
 	}
@@ -104,7 +104,7 @@ func (s *SQLStore) UpdateMessage(m *model.Message) error {
 }
 
 func (s *SQLStore) ConversationShortNameCompletions(shortName string) []string {
-	var conversations []model.Conversation
+	var conversations []api.Conversation
 	// ignore error for completions
 	s.db.Find(&conversations)
 	completions := make([]string, 0, len(conversations))
@@ -116,17 +116,17 @@ func (s *SQLStore) ConversationShortNameCompletions(shortName string) []string {
 	return completions
 }
 
-func (s *SQLStore) ConversationByShortName(shortName string) (*model.Conversation, error) {
+func (s *SQLStore) ConversationByShortName(shortName string) (*api.Conversation, error) {
 	if shortName == "" {
 		return nil, errors.New("shortName is empty")
 	}
-	var conversation model.Conversation
+	var conversation api.Conversation
 	err := s.db.Preload("SelectedRoot").Where("short_name = ?", shortName).Find(&conversation).Error
 	return &conversation, err
 }
 
-func (s *SQLStore) RootMessages(conversationID uint) ([]model.Message, error) {
-	var rootMessages []model.Message
+func (s *SQLStore) RootMessages(conversationID uint) ([]api.Message, error) {
+	var rootMessages []api.Message
 	err := s.db.Where("conversation_id = ? AND parent_id IS NULL", conversationID).Find(&rootMessages).Error
 	if err != nil {
 		return nil, err
@@ -134,20 +134,20 @@ func (s *SQLStore) RootMessages(conversationID uint) ([]model.Message, error) {
 	return rootMessages, nil
 }
 
-func (s *SQLStore) MessageByID(messageID uint) (*model.Message, error) {
-	var message model.Message
+func (s *SQLStore) MessageByID(messageID uint) (*api.Message, error) {
+	var message api.Message
 	err := s.db.Preload("Parent").Preload("Replies").Preload("SelectedReply").Where("id = ?", messageID).Find(&message).Error
 	return &message, err
 }
 
-func (s *SQLStore) MessageReplies(messageID uint) ([]model.Message, error) {
-	var replies []model.Message
+func (s *SQLStore) MessageReplies(messageID uint) ([]api.Message, error) {
+	var replies []api.Message
 	err := s.db.Where("parent_id = ?", messageID).Find(&replies).Error
 	return replies, err
 }
 
 // StartConversation starts a new conversation with the provided messages
-func (s *SQLStore) StartConversation(messages ...model.Message) (*model.Conversation, []model.Message, error) {
+func (s *SQLStore) StartConversation(messages ...api.Message) (*api.Conversation, []api.Message, error) {
 	if len(messages) == 0 {
 		return nil, nil, fmt.Errorf("Must provide at least 1 message")
 	}
@@ -178,13 +178,13 @@ func (s *SQLStore) StartConversation(messages ...model.Message) (*model.Conversa
 		if err != nil {
 			return nil, nil, err
 		}
-		messages = append([]model.Message{messages[0]}, newMessages...)
+		messages = append([]api.Message{messages[0]}, newMessages...)
 	}
 	return conversation, messages, nil
 }
 
 // CloneConversation clones the given conversation and all of its root meesages
-func (s *SQLStore) CloneConversation(toClone model.Conversation) (*model.Conversation, uint, error) {
+func (s *SQLStore) CloneConversation(toClone api.Conversation) (*api.Conversation, uint, error) {
 	rootMessages, err := s.RootMessages(toClone.ID)
 	if err != nil {
 		return nil, 0, err
@@ -226,8 +226,8 @@ func (s *SQLStore) CloneConversation(toClone model.Conversation) (*model.Convers
 }
 
 // Reply to a message with a series of messages (each following the next)
-func (s *SQLStore) Reply(to *model.Message, messages ...model.Message) ([]model.Message, error) {
-	var savedMessages []model.Message
+func (s *SQLStore) Reply(to *api.Message, messages ...api.Message) ([]api.Message, error) {
+	var savedMessages []api.Message
 
 	err := s.db.Transaction(func(tx *gorm.DB) error {
 		currentParent := to
@@ -262,7 +262,7 @@ func (s *SQLStore) Reply(to *model.Message, messages ...model.Message) ([]model.
 // CloneBranch returns a deep clone of the given message and its replies, returning
 // a new message object. The new message will be attached to the same parent as
 // the messageToClone
-func (s *SQLStore) CloneBranch(messageToClone model.Message) (*model.Message, uint, error) {
+func (s *SQLStore) CloneBranch(messageToClone api.Message) (*api.Message, uint, error) {
 	newMessage := messageToClone
 	newMessage.ID = 0
 	newMessage.Replies = nil
@@ -304,19 +304,19 @@ func (s *SQLStore) CloneBranch(messageToClone model.Message) (*model.Message, ui
 	return &newMessage, replyCount, nil
 }
 
-func fetchMessages(db *gorm.DB) ([]model.Message, error) {
-	var messages []model.Message
+func fetchMessages(db *gorm.DB) ([]api.Message, error) {
+	var messages []api.Message
 	if err := db.Preload("Conversation").Find(&messages).Error; err != nil {
 		return nil, fmt.Errorf("Could not fetch messages: %v", err)
 	}
 
-	messageMap := make(map[uint]model.Message)
+	messageMap := make(map[uint]api.Message)
 	for i, message := range messages {
 		messageMap[messages[i].ID] = message
 	}
 
 	// Create a map to store replies by their parent ID
-	repliesMap := make(map[uint][]model.Message)
+	repliesMap := make(map[uint][]api.Message)
 	for i, message := range messages {
 		if messages[i].ParentID != nil {
 			repliesMap[*messages[i].ParentID] = append(repliesMap[*messages[i].ParentID], message)
@@ -326,7 +326,7 @@ func fetchMessages(db *gorm.DB) ([]model.Message, error) {
 	// Assign replies, parent, and selected reply to each message
 	for i := range messages {
 		if replies, exists := repliesMap[messages[i].ID]; exists {
-			messages[i].Replies = make([]model.Message, len(replies))
+			messages[i].Replies = make([]api.Message, len(replies))
 			for j, m := range replies {
 				messages[i].Replies[j] = m
 			}
@@ -345,21 +345,21 @@ func fetchMessages(db *gorm.DB) ([]model.Message, error) {
 	return messages, nil
 }
 
-func (s *SQLStore) buildPath(message *model.Message, getNext func(*model.Message) *uint) ([]model.Message, error) {
-	var messages []model.Message
+func (s *SQLStore) buildPath(message *api.Message, getNext func(*api.Message) *uint) ([]api.Message, error) {
+	var messages []api.Message
 	messages, err := fetchMessages(s.db.Where("conversation_id = ?", message.ConversationID))
 	if err != nil {
 		return nil, err
 	}
 
 	// Create a map to store messages by their ID
-	messageMap := make(map[uint]*model.Message)
+	messageMap := make(map[uint]*api.Message)
 	for i := range messages {
 		messageMap[messages[i].ID] = &messages[i]
 	}
 
 	// Build the path
-	var path []model.Message
+	var path []api.Message
 	nextID := &message.ID
 
 	for {
@@ -382,12 +382,12 @@ func (s *SQLStore) buildPath(message *model.Message, getNext func(*model.Message
 // PathToRoot traverses the provided message's Parent until reaching the tree
 // root and returns a slice of all messages traversed in chronological order
 // (starting with the root and ending with the message provided)
-func (s *SQLStore) PathToRoot(message *model.Message) ([]model.Message, error) {
+func (s *SQLStore) PathToRoot(message *api.Message) ([]api.Message, error) {
 	if message == nil || message.ID <= 0 {
 		return nil, fmt.Errorf("Message is nil or has invalid ID")
 	}
 
-	path, err := s.buildPath(message, func(m *model.Message) *uint {
+	path, err := s.buildPath(message, func(m *api.Message) *uint {
 		return m.ParentID
 	})
 	if err != nil {
@@ -401,24 +401,24 @@ func (s *SQLStore) PathToRoot(message *model.Message) ([]model.Message, error) {
 // PathToLeaf traverses the provided message's SelectedReply until reaching a
 // tree leaf and returns a slice of all messages traversed in chronological
 // order (starting with the message provided and ending with the leaf)
-func (s *SQLStore) PathToLeaf(message *model.Message) ([]model.Message, error) {
+func (s *SQLStore) PathToLeaf(message *api.Message) ([]api.Message, error) {
 	if message == nil || message.ID <= 0 {
 		return nil, fmt.Errorf("Message is nil or has invalid ID")
 	}
 
-	return s.buildPath(message, func(m *model.Message) *uint {
+	return s.buildPath(message, func(m *api.Message) *uint {
 		return m.SelectedReplyID
 	})
 }
 
-func (s *SQLStore) LatestConversationMessages() ([]model.Message, error) {
-	var latestMessages []model.Message
+func (s *SQLStore) LatestConversationMessages() ([]api.Message, error) {
+	var latestMessages []api.Message
 
-	subQuery := s.db.Model(&model.Message{}).
+	subQuery := s.db.Model(&api.Message{}).
 		Select("MAX(created_at) as max_created_at, conversation_id").
 		Group("conversation_id")
 
-	err := s.db.Model(&model.Message{}).
+	err := s.db.Model(&api.Message{}).
 		Joins("JOIN (?) as sub on messages.conversation_id = sub.conversation_id AND messages.created_at = sub.max_created_at", subQuery).
 		Group("messages.conversation_id").
 		Order("created_at DESC").

pkg/lmcli/tools/tools.go

@@ -1,48 +0,0 @@
-package tools
-
-import (
-	"fmt"
-
-	"git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
-)
-
-var AvailableTools map[string]model.Tool = map[string]model.Tool{
-	"dir_tree":           DirTreeTool,
-	"read_dir":           ReadDirTool,
-	"read_file":          ReadFileTool,
-	"write_file":         WriteFileTool,
-	"file_insert_lines":  FileInsertLinesTool,
-	"file_replace_lines": FileReplaceLinesTool,
-}
-
-func ExecuteToolCalls(toolCalls []model.ToolCall, toolBag []model.Tool) ([]model.ToolResult, error) {
-	var toolResults []model.ToolResult
-	for _, toolCall := range toolCalls {
-		var tool *model.Tool
-		for _, available := range toolBag {
-			if available.Name == toolCall.Name {
-				tool = &available
-				break
-			}
-		}
-		if tool == nil {
-			return nil, fmt.Errorf("Requested tool '%s' does not exist. Hallucination?", toolCall.Name)
-		}
-
-		// Execute the tool
-		result, err := tool.Impl(tool, toolCall.Parameters)
-		if err != nil {
-			// This can happen if the model missed or supplied invalid tool args
-			return nil, fmt.Errorf("Tool '%s' error: %v\n", toolCall.Name, err)
-		}
-
-		toolResult := model.ToolResult{
-			ToolCallID: toolCall.ID,
-			ToolName:   toolCall.Name,
-			Result:     result,
-		}
-
-		toolResults = append(toolResults, toolResult)
-	}
-	return toolResults, nil
-}

pkg/tui/views/chat/chat.go

@@ -4,7 +4,6 @@ import (
 	"time"
 
 	"git.mlow.ca/mlow/lmcli/pkg/api"
-	models "git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 	"git.mlow.ca/mlow/lmcli/pkg/tui/shared"
 	"github.com/charmbracelet/bubbles/cursor"
 	"github.com/charmbracelet/bubbles/spinner"
@@ -16,37 +15,39 @@ import (
 
 // custom tea.Msg types
 type (
-	// sent on each chunk received from LLM
-	msgResponseChunk api.Chunk
-	// sent when response is finished being received
-	msgResponseEnd string
-	// a special case of common.MsgError that stops the response waiting animation
-	msgResponseError error
-	// sent on each completed reply
-	msgResponse models.Message
 	// sent when a conversation is (re)loaded
 	msgConversationLoaded struct {
-		conversation *models.Conversation
-		rootMessages []models.Message
+		conversation *api.Conversation
+		rootMessages []api.Message
 	}
 	// sent when a new conversation title generated
 	msgConversationTitleGenerated string
-	// sent when a conversation's messages are laoded
-	msgMessagesLoaded []models.Message
 	// sent when the conversation has been persisted, triggers a reload of contents
 	msgConversationPersisted struct {
 		isNew        bool
-		conversation *models.Conversation
-		messages     []models.Message
+		conversation *api.Conversation
+		messages     []api.Message
 	}
+	// sent when a conversation's messages are laoded
+	msgMessagesLoaded []api.Message
+	// a special case of common.MsgError that stops the response waiting animation
+	msgChatResponseError error
+	// sent on each chunk received from LLM
+	msgChatResponseChunk api.Chunk
+	// sent on each completed reply
+	msgChatResponse *api.Message
+	// sent when the response is canceled
+	msgChatResponseCanceled struct{}
+	// sent when results from a tool call are returned
+	msgToolResults []api.ToolResult
 	// sent when the given message is made the new selected reply of its parent
-	msgSelectedReplyCycled *models.Message
+	msgSelectedReplyCycled *api.Message
 	// sent when the given message is made the new selected root of the current conversation
-	msgSelectedRootCycled *models.Message
+	msgSelectedRootCycled *api.Message
 	// sent when a message's contents are updated and saved
-	msgMessageUpdated *models.Message
+	msgMessageUpdated *api.Message
 	// sent when a message is cloned, with the cloned message
-	msgMessageCloned *models.Message
+	msgMessageCloned *api.Message
 )
 
 type focusState int
@@ -77,14 +78,14 @@ type Model struct {
 
 	// app state
 	state           state // current overall status of the view
-	conversation    *models.Conversation
-	rootMessages    []models.Message
-	messages        []models.Message
+	conversation    *api.Conversation
+	rootMessages    []api.Message
+	messages        []api.Message
 	selectedMessage int
 	editorTarget    editorTarget
 	stopSignal      chan struct{}
-	replyChan       chan models.Message
-	replyChunkChan  chan api.Chunk
+	replyChan       chan api.Message
+	chatReplyChunks chan api.Chunk
 	persistence     bool // whether we will save new messages in the conversation
 
 	// ui state
@@ -111,12 +112,12 @@ func Chat(shared shared.Shared) Model {
 		Shared: shared,
 
 		state:        idle,
-		conversation: &models.Conversation{},
+		conversation: &api.Conversation{},
 		persistence:  true,
 
-		stopSignal:     make(chan struct{}),
-		replyChan:      make(chan models.Message),
-		replyChunkChan: make(chan api.Chunk),
+		stopSignal:      make(chan struct{}),
+		replyChan:       make(chan api.Message),
+		chatReplyChunks: make(chan api.Chunk),
 
 		wrap:            true,
 		selectedMessage: -1,
@@ -144,8 +145,8 @@ func Chat(shared shared.Shared) Model {
 
 	system := shared.Ctx.GetSystemPrompt()
 	if system != "" {
-		m.messages = []models.Message{{
-			Role:    models.MessageRoleSystem,
+		m.messages = []api.Message{{
+			Role:    api.MessageRoleSystem,
 			Content: system,
 		}}
 	}
@@ -166,6 +167,5 @@ func Chat(shared shared.Shared) Model {
 func (m Model) Init() tea.Cmd {
 	return tea.Batch(
 		m.waitForResponseChunk(),
-		m.waitForResponse(),
 	)
 }

pkg/tui/views/chat/conversation.go

@@ -2,16 +2,18 @@ package chat
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"time"
 
+	"git.mlow.ca/mlow/lmcli/pkg/agent"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
-	models "git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
 	"git.mlow.ca/mlow/lmcli/pkg/tui/shared"
 	tea "github.com/charmbracelet/bubbletea"
 )
 
-func (m *Model) setMessage(i int, msg models.Message) {
+func (m *Model) setMessage(i int, msg api.Message) {
 	if i >= len(m.messages) {
 		panic("i out of range")
 	}
@@ -19,7 +21,7 @@ func (m *Model) setMessage(i int, msg models.Message) {
 	m.messageCache[i] = m.renderMessage(i)
 }
 
-func (m *Model) addMessage(msg models.Message) {
+func (m *Model) addMessage(msg api.Message) {
 	m.messages = append(m.messages, msg)
 	m.messageCache = append(m.messageCache, m.renderMessage(len(m.messages)-1))
 }
@@ -88,7 +90,7 @@ func (m *Model) generateConversationTitle() tea.Cmd {
 	}
 }
 
-func (m *Model) updateConversationTitle(conversation *models.Conversation) tea.Cmd {
+func (m *Model) updateConversationTitle(conversation *api.Conversation) tea.Cmd {
 	return func() tea.Msg {
 		err := m.Shared.Ctx.Store.UpdateConversation(conversation)
 		if err != nil {
@@ -101,7 +103,7 @@ func (m *Model) updateConversationTitle(conversation *models.Conversation) tea.C
 // Clones the given message (and its descendents). If selected is true, updates
 // either its parent's SelectedReply or its conversation's SelectedRoot to
 // point to the new clone
-func (m *Model) cloneMessage(message models.Message, selected bool) tea.Cmd {
+func (m *Model) cloneMessage(message api.Message, selected bool) tea.Cmd {
 	return func() tea.Msg {
 		msg, _, err := m.Ctx.Store.CloneBranch(message)
 		if err != nil {
@@ -123,7 +125,7 @@ func (m *Model) cloneMessage(message models.Message, selected bool) tea.Cmd {
 	}
 }
 
-func (m *Model) updateMessageContent(message *models.Message) tea.Cmd {
+func (m *Model) updateMessageContent(message *api.Message) tea.Cmd {
 	return func() tea.Msg {
 		err := m.Shared.Ctx.Store.UpdateMessage(message)
 		if err != nil {
@@ -133,7 +135,7 @@ func (m *Model) updateMessageContent(message *models.Message) tea.Cmd {
 	}
 }
 
-func cycleSelectedMessage(selected *models.Message, choices []models.Message, dir MessageCycleDirection) (*models.Message, error) {
+func cycleSelectedMessage(selected *api.Message, choices []api.Message, dir MessageCycleDirection) (*api.Message, error) {
 	currentIndex := -1
 	for i, reply := range choices {
 		if reply.ID == selected.ID {
@@ -158,7 +160,7 @@ func cycleSelectedMessage(selected *models.Message, choices []models.Message, di
 	return &choices[next], nil
 }
 
-func (m *Model) cycleSelectedRoot(conv *models.Conversation, dir MessageCycleDirection) tea.Cmd {
+func (m *Model) cycleSelectedRoot(conv *api.Conversation, dir MessageCycleDirection) tea.Cmd {
 	if len(m.rootMessages) < 2 {
 		return nil
 	}
@@ -178,7 +180,7 @@ func (m *Model) cycleSelectedRoot(conv *models.Conversation, dir MessageCycleDir
 	}
 }
 
-func (m *Model) cycleSelectedReply(message *models.Message, dir MessageCycleDirection) tea.Cmd {
+func (m *Model) cycleSelectedReply(message *api.Message, dir MessageCycleDirection) tea.Cmd {
 	if len(message.Replies) < 2 {
 		return nil
 	}
@@ -218,15 +220,12 @@ func (m *Model) persistConversation() tea.Cmd {
 		// else, we'll handle updating an existing conversation's messages
 		for i := range messages {
 			if messages[i].ID > 0 {
-				// message has an ID, update its contents
+				// message has an ID, update it
 				err := m.Shared.Ctx.Store.UpdateMessage(&messages[i])
 				if err != nil {
 					return shared.MsgError(err)
 				}
 			} else if i > 0 {
-				if messages[i].Content == "" {
-					continue
-				}
 				// messages is new, so add it as a reply to previous message
 				saved, err := m.Shared.Ctx.Store.Reply(&messages[i-1], messages[i])
 				if err != nil {
@@ -243,13 +242,23 @@ func (m *Model) persistConversation() tea.Cmd {
 	}
 }
 
+func (m *Model) executeToolCalls(toolCalls []api.ToolCall) tea.Cmd {
+	return func() tea.Msg {
+		results, err := agent.ExecuteToolCalls(toolCalls, m.Ctx.EnabledTools)
+		if err != nil {
+			return shared.MsgError(err)
+		}
+		return msgToolResults(results)
+	}
+}
+
 func (m *Model) promptLLM() tea.Cmd {
 	m.state = pendingResponse
 	m.replyCursor.Blink = false
 
-	m.tokenCount = 0
 	m.startTime = time.Now()
 	m.elapsed = 0
+	m.tokenCount = 0
 
 	return func() tea.Msg {
 		model, provider, err := m.Shared.Ctx.GetModelProvider(*m.Shared.Ctx.Config.Defaults.Model)
@@ -257,36 +266,34 @@ func (m *Model) promptLLM() tea.Cmd {
 			return shared.MsgError(err)
 		}
 
-		requestParams := models.RequestParameters{
+		requestParams := api.RequestParameters{
 			Model:       model,
 			MaxTokens:   *m.Shared.Ctx.Config.Defaults.MaxTokens,
 			Temperature: *m.Shared.Ctx.Config.Defaults.Temperature,
 			ToolBag:     m.Shared.Ctx.EnabledTools,
 		}
 
-		replyHandler := func(msg models.Message) {
-			m.replyChan <- msg
-		}
-
 		ctx, cancel := context.WithCancel(context.Background())
 
-		canceled := false
 		go func() {
 			select {
 			case <-m.stopSignal:
-				canceled = true
 				cancel()
 			}
 		}()
 
 		resp, err := provider.CreateChatCompletionStream(
-			ctx, requestParams, m.messages, replyHandler, m.replyChunkChan,
+			ctx, requestParams, m.messages, m.chatReplyChunks,
 		)
 
-		if err != nil && !canceled {
-			return msgResponseError(err)
+		if errors.Is(err, context.Canceled) {
+			return msgChatResponseCanceled(struct{}{})
 		}
 
-		return msgResponseEnd(resp)
+		if err != nil {
+			return msgChatResponseError(err)
+		}
+
+		return msgChatResponse(resp)
 	}
 }

pkg/tui/views/chat/input.go

@@ -4,7 +4,7 @@ import (
 	"fmt"
 	"strings"
 
-	models "git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	"git.mlow.ca/mlow/lmcli/pkg/tui/shared"
 	tuiutil "git.mlow.ca/mlow/lmcli/pkg/tui/util"
 	tea "github.com/charmbracelet/bubbletea"
@@ -150,12 +150,12 @@ func (m *Model) handleInputKey(msg tea.KeyMsg) (bool, tea.Cmd) {
 			return true, nil
 		}
 
-		if len(m.messages) > 0 && m.messages[len(m.messages)-1].Role == models.MessageRoleUser {
+		if len(m.messages) > 0 && m.messages[len(m.messages)-1].Role == api.MessageRoleUser {
 			return true, shared.WrapError(fmt.Errorf("Can't reply to a user message"))
 		}
 
-		m.addMessage(models.Message{
-			Role:    models.MessageRoleUser,
+		m.addMessage(api.Message{
+			Role:    api.MessageRoleUser,
 			Content: input,
 		})
 

pkg/tui/views/chat/update.go

@@ -4,7 +4,7 @@ import (
 	"strings"
 	"time"
 
-	models "git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	"git.mlow.ca/mlow/lmcli/pkg/tui/shared"
 	tuiutil "git.mlow.ca/mlow/lmcli/pkg/tui/util"
 	"github.com/charmbracelet/bubbles/cursor"
@@ -21,15 +21,9 @@ func (m *Model) HandleResize(width, height int) {
 	}
 }
 
-func (m *Model) waitForResponse() tea.Cmd {
-	return func() tea.Msg {
-		return msgResponse(<-m.replyChan)
-	}
-}
-
 func (m *Model) waitForResponseChunk() tea.Cmd {
 	return func() tea.Msg {
-		return msgResponseChunk(<-m.replyChunkChan)
+		return msgChatResponseChunk(<-m.chatReplyChunks)
 	}
 }
 
@@ -48,7 +42,7 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 
 			if m.conversation.ShortName.String != m.Shared.Values.ConvShortname {
 				// clear existing messages if we're loading a new conversation
-				m.messages = []models.Message{}
+				m.messages = []api.Message{}
 				m.selectedMessage = 0
 			}
 		}
@@ -87,7 +81,7 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 		}
 		m.rebuildMessageCache()
 		m.updateContent()
-	case msgResponseChunk:
+	case msgChatResponseChunk:
 		cmds = append(cmds, m.waitForResponseChunk()) // wait for the next chunk
 
 		if msg.Content == "" {
@@ -100,8 +94,8 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 			m.setMessageContents(last, m.messages[last].Content+msg.Content)
 		} else {
 			// use chunk in new message
-			m.addMessage(models.Message{
-				Role:    models.MessageRoleAssistant,
+			m.addMessage(api.Message{
+				Role:    api.MessageRoleAssistant,
 				Content: msg.Content,
 			})
 		}
@@ -113,10 +107,10 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 
 		m.tokenCount += msg.TokenCount
 		m.elapsed = time.Now().Sub(m.startTime)
-	case msgResponse:
-		cmds = append(cmds, m.waitForResponse()) // wait for the next response
+	case msgChatResponse:
+		m.state = idle
 
-		reply := models.Message(msg)
+		reply := (*api.Message)(msg)
 		reply.Content = strings.TrimSpace(reply.Content)
 
 		last := len(m.messages) - 1
@@ -124,11 +118,18 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 			panic("Unexpected empty messages handling msgAssistantReply")
 		}
 
-		if reply.Role.IsAssistant() && m.messages[last].Role.IsAssistant() {
-			// this was a continuation, so replace the previous message with the completed reply
-			m.setMessage(last, reply)
+		if m.messages[last].Role.IsAssistant() {
+			// TODO: handle continuations gracefully - some models support them well, others fail horribly.
+			m.setMessage(last, *reply)
 		} else {
-			m.addMessage(reply)
+			m.addMessage(*reply)
+		}
+
+		switch reply.Role {
+		case api.MessageRoleToolCall:
+			// TODO: user confirmation before execution
+			// m.state = waitingForConfirmation
+			cmds = append(cmds, m.executeToolCalls(reply.ToolCalls))
 		}
 
 		if m.persistence {
@@ -140,17 +141,32 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 		}
 
 		m.updateContent()
-	case msgResponseEnd:
+	case msgChatResponseCanceled:
 		m.state = idle
-		last := len(m.messages) - 1
-		if last < 0 {
-			panic("Unexpected empty messages handling msgResponseEnd")
-		}
-		m.setMessageContents(last, strings.TrimSpace(m.messages[last].Content))
 		m.updateContent()
-	case msgResponseError:
+	case msgChatResponseError:
 		m.state = idle
 		m.Shared.Err = error(msg)
+		m.updateContent()
+	case msgToolResults:
+		last := len(m.messages) - 1
+		if last < 0 {
+			panic("Unexpected empty messages handling msgAssistantReply")
+		}
+
+		if m.messages[last].Role != api.MessageRoleToolCall {
+			panic("Previous message not a tool call, unexpected")
+		}
+
+		m.addMessage(api.Message{
+			Role:        api.MessageRoleToolResult,
+			ToolResults: api.ToolResults(msg),
+		})
+
+		if m.persistence {
+			cmds = append(cmds, m.persistConversation())
+		}
+
 		m.updateContent()
 	case msgConversationTitleGenerated:
 		title := string(msg)
@@ -167,7 +183,7 @@ func (m Model) Update(msg tea.Msg) (Model, tea.Cmd) {
 		m.conversation = msg.conversation
 		m.messages = msg.messages
 		if msg.isNew {
-			m.rootMessages = []models.Message{m.messages[0]}
+			m.rootMessages = []api.Message{m.messages[0]}
 		}
 		m.rebuildMessageCache()
 		m.updateContent()

pkg/tui/views/chat/view.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"strings"
 
-	models "git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	"git.mlow.ca/mlow/lmcli/pkg/tui/styles"
 	tuiutil "git.mlow.ca/mlow/lmcli/pkg/tui/util"
 	"github.com/charmbracelet/lipgloss"
@@ -63,22 +63,22 @@ func (m Model) View() string {
 	return lipgloss.JoinVertical(lipgloss.Left, sections...)
 }
 
-func (m *Model) renderMessageHeading(i int, message *models.Message) string {
+func (m *Model) renderMessageHeading(i int, message *api.Message) string {
 	icon := ""
 	friendly := message.Role.FriendlyRole()
 	style := lipgloss.NewStyle().Faint(true).Bold(true)
 
 	switch message.Role {
-	case models.MessageRoleSystem:
+	case api.MessageRoleSystem:
 		icon = "⚙️"
-	case models.MessageRoleUser:
+	case api.MessageRoleUser:
 		style = userStyle
-	case models.MessageRoleAssistant:
+	case api.MessageRoleAssistant:
 		style = assistantStyle
-	case models.MessageRoleToolCall:
+	case api.MessageRoleToolCall:
 		style = assistantStyle
-		friendly = models.MessageRoleAssistant.FriendlyRole()
-	case models.MessageRoleToolResult:
+		friendly = api.MessageRoleAssistant.FriendlyRole()
+	case api.MessageRoleToolResult:
 		icon = "🔧"
 	}
 
@@ -139,21 +139,21 @@ func (m *Model) renderMessage(i int) string {
 	}
 
 	// Show the assistant's cursor
-	if m.state == pendingResponse && i == len(m.messages)-1 && msg.Role == models.MessageRoleAssistant {
+	if m.state == pendingResponse && i == len(m.messages)-1 && msg.Role == api.MessageRoleAssistant {
 		sb.WriteString(m.replyCursor.View())
 	}
 
 	// Write tool call info
 	var toolString string
 	switch msg.Role {
-	case models.MessageRoleToolCall:
+	case api.MessageRoleToolCall:
 		bytes, err := yaml.Marshal(msg.ToolCalls)
 		if err != nil {
 			toolString = "Could not serialize ToolCalls"
 		} else {
 			toolString = "tool_calls:\n" + string(bytes)
 		}
-	case models.MessageRoleToolResult:
+	case api.MessageRoleToolResult:
 		if !m.showToolResults {
 			break
 		}
@@ -221,11 +221,11 @@ func (m *Model) conversationMessagesView() string {
 		m.messageOffsets[i] = lineCnt
 
 		switch message.Role {
-		case models.MessageRoleToolCall:
+		case api.MessageRoleToolCall:
 			if !m.showToolResults && message.Content == "" {
 				continue
 			}
-		case models.MessageRoleToolResult:
+		case api.MessageRoleToolResult:
 			if !m.showToolResults {
 				continue
 			}
@@ -251,9 +251,9 @@ func (m *Model) conversationMessagesView() string {
 	}
 
 	// Render a placeholder for the incoming assistant reply
-	if m.state == pendingResponse && (len(m.messages) == 0 || m.messages[len(m.messages)-1].Role != models.MessageRoleAssistant) {
-		heading := m.renderMessageHeading(-1, &models.Message{
-			Role: models.MessageRoleAssistant,
+	if m.state == pendingResponse && (len(m.messages) == 0 || m.messages[len(m.messages)-1].Role != api.MessageRoleAssistant) {
+		heading := m.renderMessageHeading(-1, &api.Message{
+			Role: api.MessageRoleAssistant,
 		})
 		sb.WriteString(heading)
 		sb.WriteString("\n")

pkg/tui/views/conversations/conversations.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 	"time"
 
-	models "git.mlow.ca/mlow/lmcli/pkg/lmcli/model"
+	"git.mlow.ca/mlow/lmcli/pkg/api"
 	"git.mlow.ca/mlow/lmcli/pkg/tui/shared"
 	"git.mlow.ca/mlow/lmcli/pkg/tui/styles"
 	tuiutil "git.mlow.ca/mlow/lmcli/pkg/tui/util"
@@ -16,15 +16,15 @@ import (
 )
 
 type loadedConversation struct {
-	conv      models.Conversation
-	lastReply models.Message
+	conv      api.Conversation
+	lastReply api.Message
 }
 
 type (
 	// sent when conversation list is loaded
 	msgConversationsLoaded ([]loadedConversation)
 	// sent when a conversation is selected
-	msgConversationSelected models.Conversation
+	msgConversationSelected api.Conversation
 )
 
 type Model struct {