tools/filesystem: Add post-edit command support

examples/post_edit.yaml

@@ -0,0 +1,17 @@
+agents:
+  go_developer:
+    description: A Go developer agent with post-edit formatting
+    model: gpt-4
+    instruction: |
+      You are a Go developer assistant.
+    toolsets:
+      - type: filesystem
+        post_edit:
+          - path: "*.go"
+            cmd: "gofmt -w $path"
+
+models:
+  gpt-4:
+    provider: openai
+    model: gpt-4o
+    temperature: 0.1

pkg/config/v1/types.go

@@ -17,6 +17,12 @@ type ScriptShellToolConfig struct {
 	WorkingDir string            `json:"working_dir,omitempty" yaml:"working_dir,omitempty"`
 }
 
+// PostEditConfig represents a post-edit command configuration
+type PostEditConfig struct {
+	Path string `json:"path" yaml:"path"`
+	Cmd  string `json:"cmd" yaml:"cmd"`
+}
+
 // Toolset represents a tool configuration
 type Toolset struct {
 	Type     string            `json:"type,omitempty" yaml:"type,omitempty"`
@@ -34,6 +40,9 @@ type Toolset struct {
 
 	// For the script tool
 	Shell map[string]ScriptShellToolConfig `json:"shell,omitempty" yaml:"shell,omitempty"`
+
+	// For the filesystem tool - post-edit commands
+	PostEdit []PostEditConfig `json:"post_edit,omitempty" yaml:"post_edit,omitempty"`
 }
 
 type Remote struct {

pkg/teamloader/teamloader.go

@@ -245,7 +245,19 @@ func getToolsForAgent(a *latest.AgentConfig, parentDir string, sharedTools map[s
 				return nil, fmt.Errorf("failed to get working directory: %w", err)
 			}
 
-			t = append(t, builtin.NewFilesystemTool([]string{wd}, builtin.WithAllowedTools(toolset.Tools)))
+			opts := []builtin.FileSystemOpt{builtin.WithAllowedTools(toolset.Tools)}
+			if len(toolset.PostEdit) > 0 {
+				postEditConfigs := make([]builtin.PostEditConfig, len(toolset.PostEdit))
+				for i, pe := range toolset.PostEdit {
+					postEditConfigs[i] = builtin.PostEditConfig{
+						Path: pe.Path,
+						Cmd:  pe.Cmd,
+					}
+				}
+				opts = append(opts, builtin.WithPostEditCommands(postEditConfigs))
+			}
+
+			t = append(t, builtin.NewFilesystemTool([]string{wd}, opts...))
 
 		case toolset.Type == "mcp" && toolset.Command != "":
 			if gateway != "" {

pkg/tools/builtin/filesystem.go

@@ -5,7 +5,9 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/fs"
+	"log/slog"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"regexp"
 	"strings"
@@ -14,9 +16,16 @@ import (
 	"github.com/docker/cagent/pkg/tools"
 )
 
+// PostEditConfig represents a post-edit command configuration
+type PostEditConfig struct {
+	Path string // File path pattern (glob-style)
+	Cmd  string // Command to execute (with $path placeholder)
+}
+
 type FilesystemTool struct {
 	allowedDirectories []string
 	allowedTools       []string
+	postEditCommands   []PostEditConfig
 }
 
 type FileSystemOpt func(*FilesystemTool)
@@ -27,6 +36,12 @@ func WithAllowedTools(allowedTools []string) FileSystemOpt {
 	}
 }
 
+func WithPostEditCommands(postEditCommands []PostEditConfig) FileSystemOpt {
+	return func(t *FilesystemTool) {
+		t.postEditCommands = postEditCommands
+	}
+}
+
 func NewFilesystemTool(allowedDirectories []string, opts ...FileSystemOpt) *FilesystemTool {
 	t := &FilesystemTool{
 		allowedDirectories: allowedDirectories,
@@ -439,6 +454,34 @@ func (t *FilesystemTool) Tools(context.Context) ([]tools.Tool, error) {
 	return allowedTools, nil
 }
 
+// executePostEditCommands executes any matching post-edit commands for the given file path
+func (t *FilesystemTool) executePostEditCommands(ctx context.Context, filePath string) error {
+	if len(t.postEditCommands) == 0 {
+		return nil
+	}
+
+	for _, postEdit := range t.postEditCommands {
+		matched, err := filepath.Match(postEdit.Path, filepath.Base(filePath))
+		if err != nil {
+			slog.WarnContext(ctx, "Invalid post-edit pattern", "pattern", postEdit.Path, "error", err)
+			continue
+		}
+		if !matched {
+			continue
+		}
+
+		cmd := exec.CommandContext(ctx, "/bin/sh", "-c", postEdit.Cmd)
+		cmd.Env = cmd.Environ()
+		cmd.Env = append(cmd.Env, "path="+filePath)
+
+		if err := cmd.Run(); err != nil {
+			return fmt.Errorf("post-edit command failed for %s: %w", filePath, err)
+		}
+
+	}
+	return nil
+}
+
 // Security helper to check if path is allowed
 func (t *FilesystemTool) isPathAllowed(path string) error {
 	absPath, err := filepath.Abs(path)
@@ -554,7 +597,7 @@ func (t *FilesystemTool) buildDirectoryTree(path string, maxDepth *int, currentD
 	return node, nil
 }
 
-func (t *FilesystemTool) handleEditFile(_ context.Context, toolCall tools.ToolCall) (*tools.ToolCallResult, error) {
+func (t *FilesystemTool) handleEditFile(ctx context.Context, toolCall tools.ToolCall) (*tools.ToolCallResult, error) {
 	var args struct {
 		Path  string `json:"path"`
 		Edits []struct {
@@ -596,6 +639,11 @@ func (t *FilesystemTool) handleEditFile(_ context.Context, toolCall tools.ToolCa
 		return &tools.ToolCallResult{Output: fmt.Sprintf("Error writing file: %s", err)}, nil
 	}
 
+	// Execute post-edit commands
+	if err := t.executePostEditCommands(ctx, args.Path); err != nil {
+		return &tools.ToolCallResult{Output: fmt.Sprintf("File edited successfully but post-edit command failed: %s", err)}, nil
+	}
+
 	return &tools.ToolCallResult{Output: fmt.Sprintf("File edited successfully. Changes:\n%s", strings.Join(changes, "\n"))}, nil
 }
 
@@ -1010,7 +1058,7 @@ func (t *FilesystemTool) handleSearchFilesContent(_ context.Context, toolCall to
 	return &tools.ToolCallResult{Output: strings.Join(results, "\n")}, nil
 }
 
-func (t *FilesystemTool) handleWriteFile(_ context.Context, toolCall tools.ToolCall) (*tools.ToolCallResult, error) {
+func (t *FilesystemTool) handleWriteFile(ctx context.Context, toolCall tools.ToolCall) (*tools.ToolCallResult, error) {
 	var args struct {
 		Path    string `json:"path"`
 		Content string `json:"content"`
@@ -1027,6 +1075,11 @@ func (t *FilesystemTool) handleWriteFile(_ context.Context, toolCall tools.ToolC
 		return &tools.ToolCallResult{Output: fmt.Sprintf("Error writing file: %s", err)}, nil
 	}
 
+	// Execute post-edit commands
+	if err := t.executePostEditCommands(ctx, args.Path); err != nil {
+		return &tools.ToolCallResult{Output: fmt.Sprintf("File written successfully but post-edit command failed: %s", err)}, nil
+	}
+
 	return &tools.ToolCallResult{Output: fmt.Sprintf("File written successfully: %s (%d bytes)", args.Path, len(args.Content))}, nil
 }
 

pkg/tools/builtin/filesystem_test.go

@@ -625,6 +625,82 @@ func TestFilesystemTool_StartStop(t *testing.T) {
 	require.NoError(t, err)
 }
 
+func TestFilesystemTool_PostEditCommands(t *testing.T) {
+	tmpDir := t.TempDir()
+
+	testFile := filepath.Join(tmpDir, "test.go")
+	testContent := `package main
+
+func main() {
+	fmt.Println("hello")
+}`
+
+	postEditConfigs := []PostEditConfig{
+		{
+			Path: "*.go",
+			Cmd:  "touch $path.formatted",
+		},
+	}
+	tool := NewFilesystemTool([]string{tmpDir}, WithPostEditCommands(postEditConfigs))
+
+	formattedFile := testFile + ".formatted"
+	t.Run("write_file", func(t *testing.T) {
+		handler := getToolHandler(t, tool, "write_file")
+
+		// Use proper JSON marshaling for the arguments
+		args := map[string]any{
+			"path":    testFile,
+			"content": testContent,
+		}
+		argsBytes, err := json.Marshal(args)
+		require.NoError(t, err)
+
+		toolCall := tools.ToolCall{
+			Function: tools.FunctionCall{
+				Arguments: string(argsBytes),
+			},
+		}
+
+		result, err := handler(t.Context(), toolCall)
+		require.NoError(t, err)
+		assert.Contains(t, result.Output, "File written successfully")
+
+		_, err = os.Stat(formattedFile)
+		require.NoError(t, err, "Post-edit command should have created formatted file")
+		require.NoError(t, os.Remove(formattedFile))
+	})
+
+	t.Run("edit_file", func(t *testing.T) {
+		editHandler := getToolHandler(t, tool, "edit_file")
+
+		editArgs := map[string]any{
+			"path": testFile,
+			"edits": []map[string]any{
+				{
+					"oldText": "fmt.Println",
+					"newText": "fmt.Printf",
+				},
+			},
+		}
+		editArgsBytes, err := json.Marshal(editArgs)
+		require.NoError(t, err)
+
+		editCall := tools.ToolCall{
+			Function: tools.FunctionCall{
+				Arguments: string(editArgsBytes),
+			},
+		}
+
+		editResult, err := editHandler(t.Context(), editCall)
+		require.NoError(t, err)
+		assert.Contains(t, editResult.Output, "File edited successfully")
+
+		// Check that post-edit was run again
+		_, err = os.Stat(formattedFile)
+		require.NoError(t, err, "Post-edit command should have run after edit")
+	})
+}
+
 // Helper functions
 
 func getToolHandler(t *testing.T, tool *FilesystemTool, toolName string) tools.ToolHandler {