npm-mcp

Instructions

Implementation Reference

• src/index.ts:956-978 (handler)

  Registration and implementation of the "prune" MCP tool.

  server.tool(
    "prune",
    "Remove extraneous packages not listed in package.json",
    {
      path: z.string().describe("Absolute path to the package directory"),
      production: z.boolean().optional().describe("Remove devDependencies"),
      dryRun: z.boolean().optional().describe("Preview changes without making them"),
    },
    async ({ path, production, dryRun }) => {
      const args = ["prune"];
      if (production) args.push("--omit=dev");
      if (dryRun) args.push("--dry-run");
      try {
        const { stdout, stderr } = await run(args, path);
        return { content: [{ type: "text", text: stdout + stderr || "Prune complete" }] };
      } catch (e: any) {
        return {
          content: [{ type: "text", text: `Error: ${e.stderr || e.message}` }],
          isError: true,
        };
      }
    },
  );