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## Why Before changing the Codex Bridge JSON schema policy, add integration coverage around real connector-like MCP tool schemas. The existing unit tests cover individual sanitizer behaviors, but they do not make it easy to see whether full fixture schemas keep model-visible guidance, prune only unreachable definitions, drop unsupported JSON Schema fields, and stay within the Responses API schema budget. ## What Changed - Added `tools/tests/json_schema_policy_fixtures.rs`, which converts MCP tool fixtures through `mcp_tool_to_responses_api_tool` and validates the resulting Responses tool parameters. - Added connector-style fixtures for Slack, Google Calendar, Google Drive, Notion, and Microsoft Outlook Email under `tools/tests/fixtures/json_schema_policy/`. - Added fixture assertions for preserved guidance, pruned definitions, expected field drops after `JsonSchema` conversion, marker count baselines, and dangling local `$ref` prevention. - Added a real oversized golden Notion `create_page` input schema fixture to exercise the compaction path that strips descriptions, drops root `$defs`, rewrites local refs, and fits the compacted schema under the budget.