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Unknown key

typehttps://docs.frem.sh/reference/api/errors/unknown-key
HTTP status400 Bad Request

What it means

A SAST rule uses a key outside the allowlist. Only pattern, metavariable, taint, paths, fix, options and metadata keys are allowed, so a rule cannot reach outside itself (for example with join or extract).

Example detail messages returned with this error:

  • rule key not allowed: join.

What to do

Remove the key detail names.

Response shape

All fremforge API errors are RFC 9457 problem+json:

{
  "type": "https://docs.frem.sh/reference/api/errors/unknown-key",
  "title": "Bad Request",
  "status": 400,
  "detail": "..."
}

Branch on type, not on title or detail - those are human-readable and may be reworded.

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