npm-mcp

Instructions

Implementation Reference

• src/index.ts:1004-1023 (handler)

  The 'query' tool registration and handler implementation.

  server.tool(
    "query",
    "Query installed packages using CSS-like selectors",
    {
      path: z.string().describe("Absolute path to the package directory"),
      selector: z.string().describe("CSS-like dependency selector (e.g. ':root > .prod', '.dev', '#lodash')"),
    },
    async ({ path, selector }) => {
      const args = ["query", selector];
      try {
        const { stdout } = await run(args, path);
        return { content: [{ type: "text", text: stdout }] };
      } catch (e: any) {
        return {
          content: [{ type: "text", text: `Error: ${e.stderr || e.message}` }],
          isError: true,
        };
      }
    },
  );