disallow fileparams metadata for custom mcps#19836
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soheil-oai
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Apr 27, 2026
soheil-oai
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Apr 27, 2026
mzeng-openai
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Apr 27, 2026
owenlin0
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Apr 27, 2026
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Summary
Disallow fileParams metadata for custom MCPs
Restricts Codex openai/fileParams handling to the first-party codex_apps MCP server. Custom MCP servers may still advertise the metadata, but Codex now ignores it for upload rewriting, preventing non-Apps tools from receiving signed OpenAI file refs for local paths. Added a regression test for the allowed and denied cases.