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The Spawn quality score answers one question:
The score is a composite of metadata, liveness, and community signal. The maximum is 100.

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Layers

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Tier thresholds

The exact tier can be capped when core gates fail. For example, a dead endpoint should not rank as a high-quality agent just because its metadata looks polished. S+ is a display tier derived from S when the score is 95+. It is not a separate stored tier. Existing API filters still use S, A, B, C, and F.

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Proven callable

The strongest liveness signal is a real protocol proof:
  • MCP tools/call succeeds;
  • A2A message path succeeds;
  • x402 response is verified;
  • another supported protocol completes a safe call.
Declared support is weaker than verified support. Metadata that says “MCP” is only a claim until a probe observes usable behavior.

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Run the checker

Or use the web checker:

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Improve the score

The usual fastest fixes are:
  1. Write a concrete description around the job, inputs, outputs, and protocols.
  2. Add an image and durable metadata URI.
  3. Add one working service entry.
  4. Make MCP tools/list and one safe tools/call work.
  5. Add x402 demo mode if the service is paid.

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