fix: restore search fallback routing - #35690
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- Restore Kimi switch preset to kimi-coding/k2p6 and clean AGENTS guidance - Register MiniMax and Serper as selectable web search backends - Add empty-result/error fallback chain for web_search_tool - Add regression tests for backend selection and fallback behavior - Correct substrate/search docs and switch-agent helper
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This was referenced Jun 26, 2026
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…u-baidu, serpapi, jina, google-cse, sogou, 360-search) v0.17 removed the Parallel free MCP fallback (NousResearch#46350), sharply reducing free search options. This adds 9 new providers as plugins following the existing brave-free/ddgs pattern, registered in backend_candidates in composite quality-score order after the existing backends. New functional providers (search-only): - serper — Google SERP, 2,500 free queries, no credit card - baidu — Baidu AI Search, 100/day free, native Chinese content - bocha — Chinese market leader, 1,000 free starter queries - qiniu-baidu — Qiniu Cloud Baidu, 3M tokens for new users - serpapi — Multi-engine, 100/month free - jina — Full-page extraction, 10M tokens free (blocked in China) - google-cse — Google Custom Search, 100/day (blocked in China) Registry-only entries (no public API, listed for completeness): - sogou, 360-search Two prior attempts (NousResearch#41015 Serper by ViezeVingertjes, NousResearch#35690 fallback by jonathanwxh-cell) were self-closed without review. This salages their approach with a complete provider surface covering both Western and Chinese search engines. Changes: - plugins/web/*/ — 27 new files (provider.py, plugin.yaml, __init__.py per backend) - tools/web_tools.py — +9 entries in _KNOWN_WEB_BACKENDS set, +9 in backend_candidates tuple, +_check_provider_available() helper, generic plugin probe in _is_backend_available()
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