docs: define foreign web-search compatibility contract - #22
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## Summary Follow up the merged foreign web-search compatibility contract from #22 with the intentionally small production fix it identified. This PR: - stops mapping LiteLLM `supports_web_search=false` to Codex `supports_search_tool=false` for exact templates - stops treating `supports_web_search` overrides as provenance/ownership for exact `supports_search_tool` - keeps foreign `supports_search_tool=false` as a conservative **tool-search/deferred-discovery** decision, not a hosted-web-search suppression guarantee - keeps LiteLLM/override `supports_web_search` visible as capability evidence in `explain` - adds regressions for raw exact evidence, exact overrides, and foreign override provenance - aligns the older model-group aggregation design text with the source-backed web-search contract No foreign hosted-web-search enablement is added. Provider/runtime hosted-search behavior remains deferred under `docs/foreign-web-search.md`. Refs #5 <!-- devin-review-badge-begin --> --- <a href="https://app.devin.ai/review/avibacktoblack/litellm-codex-models/pull/23" target="_blank"> <picture> <source media="(prefers-color-scheme: dark)" srcset="https://static.devin.ai/assets/gh-devin-review-dark.svg?v=3"> <img src="https://static.devin.ai/assets/gh-devin-review-light.svg?v=3" alt="Devin Review"> </picture> </a> <!-- devin-review-badge-end -->
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Summary
Close the v0.3 foreign web-search research/design gate before changing production behavior.
This PR records the source-backed contract discovered from current Codex and LiteLLM behavior:
supports_search_toolis about tool discovery/deferred exposure, not hosted web searchweb_searchis gated by provider capability + runtime web-search mode;web_search_tool_typeonly selects request shapeweb_search=truedisabledvariantsupports_web_searchis capability evidence but does not prove that every routed deployment accepts the exact OpenAI Responses hosted-search wire shape Codex emitsThe contract also identifies an immediate follow-up bugfix: stop mapping LiteLLM
supports_web_searchto Codexsupports_search_tool, and stop describing foreignsupports_search_tool=falseas a hosted-search disable guarantee.The companion source index makes the research re-checkable against future version-matched Codex/LiteLLM releases.
Refs #5