Claude Code MCP

Instructions

Implementation Reference

• src/server/tools.ts:213-231 (handler)

  The handler function for the 'editFile' tool that takes file_path and content, writes the content to the file using writeFile utility, and returns a success or error response.

  async ({ file_path, content }) => {
    try {
      await writeFile(file_path, content);
      return {
        content: [{ 
          type: "text", 
          text: `File ${file_path} has been updated.`
        }]
      };
    } catch (error) {
      return {
        content: [{ 
          type: "text", 
          text: error instanceof Error ? error.message : String(error)
        }],
        isError: true
      };
    }
  }

• src/server/tools.ts:209-212 (schema)

  Zod input schema defining parameters for the 'editFile' tool: file_path (string) and content (string).

  {
    file_path: z.string().describe("The absolute path to the file to edit"),
    content: z.string().describe("The new content for the file")
  },

• src/server/tools.ts:206-232 (registration)

  Registration of the 'editFile' tool on the MCP server using server.tool(), including description, schema, and inline handler.

  server.tool(
    "editFile",
    "Create or edit a file",
    {
      file_path: z.string().describe("The absolute path to the file to edit"),
      content: z.string().describe("The new content for the file")
    },
    async ({ file_path, content }) => {
      try {
        await writeFile(file_path, content);
        return {
          content: [{ 
            type: "text", 
            text: `File ${file_path} has been updated.`
          }]
        };
      } catch (error) {
        return {
          content: [{ 
            type: "text", 
            text: error instanceof Error ? error.message : String(error)
          }],
          isError: true
        };
      }
    }
  );

• src/utils/file.ts:112-121 (helper)

  Supporting utility function writeFile that performs the file system write operation using Node.js fs.promises.writeFile.

  export async function writeFile(
    filePath: string,
    content: string
  ): Promise<void> {
    try {
      await fs.writeFile(filePath, content, 'utf-8');
    } catch (error) {
      throw error;
    }
  }