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handler() — mcp Function Reference

Architecture documentation for the handler() function in overview.ts from the mcp codebase.

Function typescript AnalysisTools ArchitectureMapping calls 5

Entity Profile

Dependency Diagram

graph TD
  7623ea08_e684_62f6_f74f_3b1d646a26f5["handler()"]
  05b504b7_268e_7c49_d109_73f7c3744be0["asErrorResult()"]
  7623ea08_e684_62f6_f74f_3b1d646a26f5 -->|calls| 05b504b7_268e_7c49_d109_73f7c3744be0
  1721f7fd_bb7b_c8c3_9b4b_5677293ae256["resolveOrFetchGraph()"]
  7623ea08_e684_62f6_f74f_3b1d646a26f5 -->|calls| 1721f7fd_bb7b_c8c3_9b4b_5677293ae256
  67622b0f_6b47_8f68_bac5_409b3145d2f2["asTextContentResult()"]
  7623ea08_e684_62f6_f74f_3b1d646a26f5 -->|calls| 67622b0f_6b47_8f68_bac5_409b3145d2f2
  d8e22e5c_06d6_3c1a_d1ff_f9f562d53e5d["renderOverview()"]
  7623ea08_e684_62f6_f74f_3b1d646a26f5 -->|calls| d8e22e5c_06d6_3c1a_d1ff_f9f562d53e5d
  f8f0f24b_951e_04ad_fb80_1ae3dde982e9["classifyApiError()"]
  7623ea08_e684_62f6_f74f_3b1d646a26f5 -->|calls| f8f0f24b_951e_04ad_fb80_1ae3dde982e9
  style 7623ea08_e684_62f6_f74f_3b1d646a26f5 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

src/tools/overview.ts lines 50–70

export const handler: HandlerFunction = async (client, args, defaultWorkdir) => {
  const rawDir = args?.directory as string | undefined;
  const directory = (rawDir && rawDir.trim()) || defaultWorkdir || process.cwd();

  if (!directory || typeof directory !== 'string') {
    return asErrorResult({
      type: 'validation_error',
      message: 'No directory provided and no default workdir configured.',
      code: 'MISSING_DIRECTORY',
      recoverable: false,
      suggestion: 'Provide a directory parameter or start the MCP server with a workdir argument.',
    });
  }

  try {
    const graph = await resolveOrFetchGraph(client, directory);
    return asTextContentResult(renderOverview(graph));
  } catch (error: any) {
    return asErrorResult(classifyApiError(error));
  }
};

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Frequently Asked Questions

What does handler() do?
handler() is a function in the mcp codebase.
What does handler() call?
handler() calls 5 function(s): asErrorResult, asTextContentResult, classifyApiError, renderOverview, resolveOrFetchGraph.

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