[cshape]

What

Documents llm.custom.headers on the Custom LLM page: extra headers sent on every request to the customer's endpoint.

• The auth paragraph points to headers for endpoints that need more than the bearer.
• The PATCH example includes a headers object.
• A headers row in the field table: write-only like api_key, sending it replaces the stored set, omit or null keeps it, {} clears it, and headers the platform sends itself can't be set.
• A note that the console doesn't show or edit headers, keeps them on save, and Run test sends them for the saved endpoint.
• versions-publishing.mdx lists headers with api_key as read back as null.

Merge after

• The API serves the field: https://api.fish.audio/openapi.json lists headers on PublicAgentLLMCustomConfig. Until then the PATCH example returns 422.
• The OpenAPI schema is updated: merge the nightly "chore: update OpenAPI schema" PR first, or run npm run update:openapi on this branch. The PR check fails while the committed schema differs from the live one.

Checks

• The PATCH-with-headers example was tested end to end before release.
• mint broken-links --check-anchors: no new broken links; the in-page anchor resolves.

[mintlify]

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Project	Status	Preview	Updated
hanabiaiinc	🟢 Ready	View Preview	Oct 24, 2026, 6:04 AM

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Caution

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