feat: add RequestPermissionTool for user permission prompts

pkg/tools/permission.go

@@ -1,7 +1,11 @@
 package tools
 
 import (
+	"context"
+	"fmt"
 	"sync"
+
+	"github.com/sipeed/picoclaw/pkg/logger"
 )
 
 type PermissionCache struct {
@@ -19,19 +23,19 @@ func NewPermissionCache() *PermissionCache {
 func (pc *PermissionCache) Check(path string) string {
 	pc.mu.RLock()
 	defer pc.mu.RUnlock()
-	
+
 	// Check exact match
 	if val, ok := pc.perms[path]; ok {
 		return val
 	}
-	
+
 	// Check if any parent path is granted "session"
 	for cachedPath, val := range pc.perms {
 		if val == "session" && len(cachedPath) < len(path) && path[:len(cachedPath)] == cachedPath {
 			return "session"
 		}
 	}
-	
+
 	return ""
 }
 
@@ -46,3 +50,58 @@ func (pc *PermissionCache) Revoke(path string) {
 	defer pc.mu.Unlock()
 	delete(pc.perms, path)
 }
+
+// RequestPermissionTool prompts user for permission when exec tool needs access outside workspace.
+type RequestPermissionTool struct {
+	cache *PermissionCache
+}
+
+func NewRequestPermissionTool(cache *PermissionCache) *RequestPermissionTool {
+	return &RequestPermissionTool{cache: cache}
+}
+
+func (t *RequestPermissionTool) Name() string {
+	return "request_permission"
+}
+
+func (t *RequestPermissionTool) Description() string {
+	return "Request user permission for accessing paths outside workspace. Returns prompt for user."
+}
+
+func (t *RequestPermissionTool) PromptMetadata() PromptMetadata {
+	return PromptMetadata{
+		Layer:  ToolPromptLayerCapability,
+		Slot:   ToolPromptSlotTooling,
+		Source: ToolPromptSourceRegistry,
+	}
+}
+
+func (t *RequestPermissionTool) Parameters() map[string]any {
+	return map[string]any{
+		"type": "object",
+		"properties": map[string]any{
+			"path": map[string]any{
+				"type":        "string",
+				"description": "Path that needs permission",
+			},
+			"command": map[string]any{
+				"type":        "string",
+				"description": "Original command (for context)",
+			},
+		},
+		"required": []string{"path"},
+	}
+}
+
+func (t *RequestPermissionTool) Execute(ctx context.Context, args map[string]any) *ToolResult {
+	path, _ := args["path"].(string)
+	command, _ := args["command"].(string)
+
+	logger.InfoCF("permission", "Permission request", map[string]any{"path": path, "command": command})
+
+	// Return structured prompt that LLM will show to user
+	return &ToolResult{
+		ForLLM: fmt.Sprintf("User permission needed for %s. Ask user: 'Allow once' or 'Allow for session'?", path),
+		ForUser: fmt.Sprintf("⚠️ **Permission Required**\n\nPicoClaw wants to execute: `%s`\nThis accesses `%s` which is outside your workspace.\n\n**How would you like to proceed?**\n- Type `once` for one-time access\n- Type `session` to allow all access to this path for this session\n- Type `no` to deny", command, path),
+	}
+}