Custom GPT actions intermittently fail to dispatch — "actions not available in this chat session," nothing reaches our server

Standard workspace (not FedRAMP), ChatGPT Pro, web.

Our custom GPTs have OAuth-configured actions with a valid OpenAPI 3.1.0 schema. Intermittently, the GPT responds that “the required actions aren’t available in this chat session” and no request reaches our backend (confirmed via server logs — total silence, not an error). Minutes earlier the same GPT, same config, dispatched the same actions successfully. No changes on our side between working and failing runs.

Critically, the Action “Test” button in the GPT builder also fails to fire on these actions — this bypasses the model, instructions, and schema interpretation entirely, so it is not a prompting or configuration issue on our end.

Verified our side is healthy: direct curl to the endpoint returns correct responses (401 without token). The failure is in ChatGPT’s action-dispatch layer, not our server.

Multi-action GPTs are hit hardest; single-action GPTs are more reliable. Intermittent and non-reproducible on identical input.