- search(..., scope=code) restricts to 15 programming domains
(official docs, GitHub, registries, Stack Overflow, CVE/NVD):
native include_domains/search_domain_filter where supported
(Tavily, Exa, Perplexity), post-filtering for all providers
(Brave, SearXNG, DuckDuckGo have no native filter).
- web_fetch now uses fetch_best: Tavily extract, then Exa
contents, then direct fetch; both-fail errors name both
failures, direct-fetch 403 under the egress whitelist is
fail-closed, not bypassed. Default general scope and direct
fetch_url behaviour unchanged.
- MCP web_search gains scope enum (general/code); docs updated.
- Tests all mock HTTP, no real keys.
web_search auto chain Perplexity/Exa/Tavily/Brave/SearXNG/DuckDuckGo
with pinned-provider no-fallback, web_fetch with head+tail truncation,
codex-home seeding helper (idempotent, never writes keys).
Tests: cloud/tests/test_websearch_mcp.py 12/12 (mocked HTTP).
Not wired into worker, not deployed, paid backends not live-tested.
host