Update from code changes: document universal search API

[mintlify]

Summary

Documents the new Universal Search REST API for customers with the Universal Search entitlement. Covers three endpoints: POST /universal-search/v1/search for querying Mintlify-hosted documentation and the wider web, POST /universal-search/v1/context for assembling a token-budgeted retrieval-augmented generation payload, and POST /universal-search/v1/contents for fetching stitched Markdown for specific pages by ID or URL with per-input success or error statuses. Related upstream changes: https://github.com/mintlify/server/pull/6678, https://github.com/mintlify/server/pull/6682, and https://github.com/mintlify/server/pull/6677.

Changes

• Added api/universal-search/search.mdx, api/universal-search/context.mdx, and api/universal-search/contents.mdx API reference pages, with guidance on authentication, entitlement, request shape, partial-success behavior, and format selection.
• Added universal-search-openapi.json describing all three endpoints, a shared result schema, request bodies, per-item error tags (not_found, not_synced, invalid_id, fetch_error), txt vs. json context formats, and example requests.
• Updated api/introduction.mdx to list all three endpoints, add the universal search API key row, and describe when to use it.
• Wired the new group and pages into the API reference navigation for English, Spanish, French, and Chinese, and added localized MDX pages and OpenAPI specs.
• Registered the new OpenAPI file in gt.config.json.

Update history

• Initial run: documented POST /universal-search/v1/search — new API reference page, OpenAPI spec, third API key type in api/introduction.mdx, navigation entries for en/es/fr/zh, localized page and spec copies, and gt.config.json registration. Documents https://github.com/mintlify/server/pull/6678.
• Follow-up run: documented POST /universal-search/v1/contents — added api/universal-search/contents.mdx, extended universal-search-openapi.json with the new path and a shared Result schema, wired it into nav and api/introduction.mdx, and mirrored MDX, OpenAPI, and nav updates for es/fr/zh. Documents https://github.com/mintlify/server/pull/6677.
• Follow-up run: documented POST /universal-search/v1/context — added api/universal-search/context.mdx covering the txt/json output formats, product retrieval bias, and 10,000-token budget; extended universal-search-openapi.json with the new path; wired it into nav and api/introduction.mdx; and mirrored MDX, OpenAPI, and nav updates for es/fr/zh. Documents https://github.com/mintlify/server/pull/6682.
• Follow-up run: no docs change. The upstream commit (https://github.com/mintlify/server/pull/6731) adds an internal eval harness under evals/universal-search/ for measuring Universal Search quality against historical ClickHouse queries. It has no customer-facing API, entitlement, or behavior change, so nothing was added to the docs.

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[mintlify]

Update from code changes updated this PR.

Added Universal Search contents endpoint reference with translations

Source PRs

• mintlify/server#6677 — feat: implement POST /v1/contents for Universal Search API

[mintlify]

Update from code changes updated this PR.

Added Universal Search context endpoint reference with translations

Source PRs

• mintlify/server#6682 — universal search context endpoint impl

[mintlify]

Update from code changes updated this PR.

Added nothing; upstream change was internal tooling only

Source PRs

• mintlify/server#6731