Function createWriteTool

packages/computer/src/tools/fs/write.ts:21–47

(options: WriteToolOptions)

});

export function createWriteTool(options: WriteToolOptions): Tool<z.infer<typeof inputSchema>> {
  const { store } = options;
  const maxBytes = options.maxBytes ?? DEFAULT_MAX_BYTES;

  return tool({
    description: "Write content to a file. Overwrites any existing file at the path.",
    inputSchema,
    execute: async ({ path, content }) => {
      const bytes = new TextEncoder().encode(content);
      if (bytes.length > maxBytes) {
        return {
          error: `Content too large: ${bytes.length} bytes exceeds the ${maxBytes}-byte write cap. Use the edit tool for incremental changes to existing files, or split the write into smaller pieces.`,
        };
      }
      try {
        // Preserve the existing file's mode when overwriting so executable
        // scripts don't silently lose their +x bit. For new files we leave
        // `mode` undefined and let the store apply its own default.
        const existing = await store.stat(path);
        await store.write(path, bytes, existing ? { mode: existing.mode } : undefined);
        return { path, bytesWritten: bytes.length };
      } catch (err) {
        return { error: err instanceof Error ? err.message : String(err) };
      }
    },
  });
}