Read the evidence claim standard and its reference endpoints.

The standard names evidence fields and principles. Reading it does not verify a claim or grant permission to execute an artifact. This handler is served by the production Postgres backend; the local JSON fixture backend may return 404.

Inputs. Path, query and header fields are listed below. No request body is required.

Outputs. See each status below for its media type, schema and headers. A missing record or unavailable capability is not a successful empty result.

Errors. API JSON failures use the documented response schema. Read code, message and next; retry only when the response allows it. Auth, invalid input and missing records need a caller change.

Rate limits. Public read budgets apply by client IP and route group. This operation can have a smaller route-specific budget. Read Retry-After on 429 or retryable 503 responses.