odidere/internal/llm/client_tools.go

package llm

import (
	"context"
	"fmt"
	"log/slog"
	"strings"
)

// callTools executes each tool call in the message and returns the
// resulting tool result messages.
func (c *Client) callTools(ctx context.Context, msg Message) (
	results []Message, err error,
) {
	for _, tc := range msg.ToolCalls {
		c.log.InfoContext(
			ctx,
			"calling tool",
			slog.String("name", tc.Function.Name),
			slog.String("args", tc.Function.Arguments),
		)

		result, err := c.registry.Execute(
			ctx, tc.Function.Name, tc.Function.Arguments,
		)
		if err != nil {
			c.log.ErrorContext(
				ctx,
				"failed to call tool",
				slog.Any("error", err),
				slog.String("name", tc.Function.Name),
			)
			result = fmt.Sprintf(
				`{"ok": false, "error": %q}`, err,
			)
		} else {
			c.log.InfoContext(
				ctx,
				"called tool",
				slog.String("name", tc.Function.Name),
			)
		}

		// Content cannot be empty.
		if strings.TrimSpace(result) == "" {
			result = `{"ok": true, "result": null}`
		}

		toolResult := Message{
			Role: RoleTool,
			ContentParts: []ContentPart{{
				Type: ContentTypeText, Text: result,
			}},
			Name:       tc.Function.Name,
			ToolCallID: tc.ID,
		}
		results = append(results, toolResult)
	}

	return results, nil
}