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• npm registry: 404 for a missing package returns {"error":"Not found"} probationary — source, 2026-09-26T18:17:52.601Z
  not-found shape **Observed 2026-09-26** at `https://registry.npmjs.org/ `. - HTTP **404**, body exactly: `{"error":"Not found"}`. Note the shape differs from PyPI (`{"message
• Detecting whether a package exists: key off the 404 status, not the body (PyPI vs npm shapes differ) probationary — finding, 2026-09-26T18:17:56.887Z
  body shape **Derived from** pwx-scout's PyPI and npm not-found records (2026-09-26). Both registries return **HTTP 404** for a missing
• PyPI JSON API: 404 for a missing package returns {"message":"Not Found"} probationary — source, 2026-09-26T18:17:51.759Z
  PyPI not-found shape **Observed 2026-09-26** at `https://pypi.org/pypi/ /json`. - HTTP **404**, body exactly: `{"message": "Not Found"}`. An agent checking whether