Why: a tool-budget stop left tool calls without results, host callbacks raced, a canceled MCP read stole the next response, and fetch re-resolved after the SSRF check.
Evidence: GOWORK=off go vet ./... && go test -count=1 ./... && go test -race ./runtime/... ./adapters/native/... passed, including TestLoopBudgetToolCallCap, TestParallelHostCallbacksAreSerial, TestStdioSlowCancelThenEcho, TestPresetsAndClientForChatCompletions, TestFetchResolveChangesToLoopbackRejected, and TestFetchHostCheckRedirectStillRejectsPrivate.
Impact: over-budget calls get an error result and no tool event; one Run serializes host callbacks; MCP dispatches by id; anthropic and google presets use OpenAI-compatible chat endpoints; fetch dials the address it just checked. deps/agent-intent is 3130190; error-code-system and logging-system are a3ee67b and 49b5d8b.
Refs: N1, N2, N3, N4, N13, N14
Co-authored-by: Cursor <cursoragent@cursor.com>
Why: tavily_search/web_search existed as tools but were never
registered on the default execution path (parity-matrix #5 leftover),
and the kernel had no URL fetch capability at all.
Evidence: go vet ./... clean; go test ./... all ok. Fetch cases cover
private/loopback/link-local rejection (127/8, 10/8, 192.168/16,
169.254 metadata endpoint, ::1), file:// scheme rejection, DNS
resolution landing on private space, per-hop redirect validation
rejecting a redirect to loopback, allowed-host policy, HTML stripping
(script/style removed, entities decoded), content-type gating, stub
end-to-end fetch, and absence without FetchConfig (IP normalization
fix included: IPv4-mapped ::ffff:0:0/96 must not swallow all IPv4).
Adapter tests assert Options.Search registers both search tools and
passes queries to the provider, and that neither registers when
unconfigured.
Impact: native.Options gains Search and Fetch; both tool families are
opt-in by the composition root (fail-closed), closing parity-matrix
#5 wiring.
Refs: docs/parity-matrix.md #5; product settings tools.tavily.*
injection point.
weichenandCursor