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* fix(tavily): contain malformed web search and fetch payloads web_search and web_fetch normalized the SDK's decoded 200 body without validating its shape: a `results`/`failed_results` container of the wrong type, a non-object entry, or a missing leaf field escaped as a raw TypeError/KeyError/AttributeError instead of the structured format error brave, serper, serply, sofya, tencent_wsa, unbrowse and groundroute return. Validate the container with one shared helper, skip non-object entries while preserving valid objects in order, normalize missing leaf fields to empty text, and coerce a non-string raw_content in web_fetch before truncating. Diagnostics carry only the malformed container's name and type, never the query, URL, key or payload values. backend/tests/test_tavily_response_shapes.py drives the real tools and SDK over an offline HTTPX MockTransport; it fails 32 of 36 cases on main and passes with this change, while test_tavily_tools.py stays green. * docs(readme): note Tavily payload containment Follow the Brave and GroundRoute README entries in the setup wizard step; the containment contract itself lives in community/tavily/AGENTS.md. * fix(tavily): normalize null search fields and test mixed fetch lists --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>