Summary A custom Remote MCP server (connected as a ChatGPT app via Developer Mode; OAuth 2.1 + DCR + PKCE) works fine in fresh conversations, but in long-lived or older conversations — including threads inside a Project — its tools stop being exposed to the model for that conversation. The model can…

:coffin: Update after a few more days of testing: still reproducing, with one new wrinkle Still seeing the original behavior consistently: in long/old conversations the connected MCP app’s tools drop out of the manifest, the model says they’re “not available in this thread,” and our server logs s…

Remote MCP app tools silently dropped from a conversation's tool manifest in long/old chats (model can name them but cannot call them)

ChatGPT Apps SDK

iamkishank June 26, 2026, 6:06am 3

facing this exact issue. please let me know if you found a solution. looks like OpenAI really wants Anthropic to win lol.

Free ChatGPT accounts inconsistent when invoking apps

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Remote MCP app tools silently dropped from a conversation's tool manifest in long/old chats (model can name them but cannot call them)

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