Contract boundary audit

Skill ID: flutter-mcp-boundary-audit — name is historical; content is repository-neutral. Same workflow applies to MCP stacks, RPC gateways, plugin registries, and OpenAPI-style contracts.

For mcp_flutter, use this skill to audit Flutter adapter parity: fmt_* catalog schemas, CLI exec, VM-service extension gateways, dynamic discovery, migrators, and consumer platform docs. Change app discovery or the Flutter bridge here; change canonical IntentCall registry/session semantics, schema policy, platform projection, or publish behavior upstream.

Find split-brain bugs: what clients see in listings, catalogs, or docs ≠ what runtime enforces on invoke—or validation exists on one gateway only.

Typical symptoms: