Expose fail-when postconditions on inline HTTP grants #267

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opened 2026-07-29 03:29:58 +00:00 by coilyco-ops · 0 comments

coilyco-ops commented

2026-07-29 03:29:58 +00:00

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Outcome

Allow inline opcore grants used by ward-mcp to reject semantically invalid 2xx responses with a JMESPath fail-when predicate.

Required behavior

Parse and validate fail-when on a can grant.
Evaluate it after a successful HTTP response.
Bind request path, query, and body inputs as JMESPath variables.
Return a coded error when the predicate matches.
Keep grants without a predicate unchanged.
Document and test the inline grammar.

Motivating case

Forgejo accepts an unknown numeric issue-label ID with HTTP success and an empty resulting label set. The deploy Forgejo MCP must compare the requested $labels with the returned label IDs and fail loudly instead of accepting the no-op.

Refs coilyco-bridge/deploy#247.

## Outcome Allow inline opcore grants used by ward-mcp to reject semantically invalid 2xx responses with a JMESPath fail-when predicate. ## Required behavior * Parse and validate fail-when on a can grant. * Evaluate it after a successful HTTP response. * Bind request path, query, and body inputs as JMESPath variables. * Return a coded error when the predicate matches. * Keep grants without a predicate unchanged. * Document and test the inline grammar. ## Motivating case Forgejo accepts an unknown numeric issue-label ID with HTTP success and an empty resulting label set. The deploy Forgejo MCP must compare the requested $labels with the returned label IDs and fail loudly instead of accepting the no-op. Refs coilyco-bridge/deploy#247.

coilyco-ops referenced this issue from a commit

2026-07-29 03:35:45 +00:00

feat(opcore): add inline response postconditions, closes #267

coilyco-ops closed this issue

2026-07-29 03:35:45 +00:00

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coilyco-flight-deck/umbra#267

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