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Filesystem MCP Server

by mark3labs
package handler import ( "context" "fmt" "os" "path/filepath" "github.com/mark3labs/mcp-go/mcp" ) func (fs *FilesystemHandler) HandleWriteFile( ctx context.Context, request mcp.CallToolRequest, ) (*mcp.CallToolResult, error) { path, err := request.RequireString("path") if err != nil { return nil, err } content, err := request.RequireString("content") if err != nil { return nil, err } // Handle empty or relative paths like "." or "./" by converting to absolute path if path == "." || path == "./" { // Get current working directory cwd, err := os.Getwd() if err != nil { return &mcp.CallToolResult{ Content: []mcp.Content{ mcp.TextContent{ Type: "text", Text: fmt.Sprintf("Error resolving current directory: %v", err), }, }, IsError: true, }, nil } path = cwd } validPath, err := fs.validatePath(path) if err != nil { return &mcp.CallToolResult{ Content: []mcp.Content{ mcp.TextContent{ Type: "text", Text: fmt.Sprintf("Error: %v", err), }, }, IsError: true, }, nil } // Check if it's a directory if info, err := os.Stat(validPath); err == nil && info.IsDir() { return &mcp.CallToolResult{ Content: []mcp.Content{ mcp.TextContent{ Type: "text", Text: "Error: Cannot write to a directory", }, }, IsError: true, }, nil } // Create parent directories if they don't exist parentDir := filepath.Dir(validPath) if err := os.MkdirAll(parentDir, 0755); err != nil { return &mcp.CallToolResult{ Content: []mcp.Content{ mcp.TextContent{ Type: "text", Text: fmt.Sprintf("Error creating parent directories: %v", err), }, }, IsError: true, }, nil } if err := os.WriteFile(validPath, []byte(content), 0644); err != nil { return &mcp.CallToolResult{ Content: []mcp.Content{ mcp.TextContent{ Type: "text", Text: fmt.Sprintf("Error writing file: %v", err), }, }, IsError: true, }, nil } // Get file info for the response info, err := os.Stat(validPath) if err != nil { // File was written but we couldn't get info return &mcp.CallToolResult{ Content: []mcp.Content{ mcp.TextContent{ Type: "text", Text: fmt.Sprintf("Successfully wrote to %s", path), }, }, }, nil } resourceURI := pathToResourceURI(validPath) return &mcp.CallToolResult{ Content: []mcp.Content{ mcp.TextContent{ Type: "text", Text: fmt.Sprintf("Successfully wrote %d bytes to %s", info.Size(), path), }, mcp.EmbeddedResource{ Type: "resource", Resource: mcp.TextResourceContents{ URI: resourceURI, MIMEType: "text/plain", Text: fmt.Sprintf("File: %s (%d bytes)", validPath, info.Size()), }, }, }, }, nil }

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