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E1213 — Input bytes failed schema validation

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What happened

Input bytes failed schema validation.

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Why it happened

A payload could not be decoded or encoded under the codec the handler declared (CIP-6 §9.5). Despite the catalog wording, this is not limited to the inbound direction — the handler side normalizes every codec fault to this code, so it covers both:
  • Inbound decode — the payload does not conform to the expected schema (invalid CBOR structure, wrong field types), or is refused by the declared codec’s profile.
  • Return encode — the handler returned a value its declared codec cannot serialize.

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How to fix

For an inbound failure, check the encoding and field layout against the target handler’s expected schema, and confirm the caller’s codec= matches the handler’s decode= — the codec is not carried on the wire, so a mismatch cannot be detected for you. For a return failure, check that the returned value is encodable under the handler’s declared codec. Returning bytes passes through unencoded if you have already serialized the payload yourself.

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