AnySearch provider integration (PR #11690)

Template: xquik #11370 (merged in release/v3.8.51). Posture: fallbackOnly. Upstream proposal: issue diegosouzapw/OmniRoute#11637.

1. Service ground truth (official docs, cross-checked)

• Base URL: https://api.anysearch.com (REST) + POST /mcp (MCP, JSON-RPC 2.0).
• POST /v1/search - params: query (required), max_results (1-10, default 10), tag ({domain}.{sub_domain} vertical routing), zone (cn/intl), language, params (structured vertical fields), format (json/markdown).
• GET /v1/sub-domains?domain=... - capability catalog, does NOT count against quota.
• POST /v1/extract - fetch/extract {url, title, content}; strict JSON body, 16 KiB cap.
• POST /v1/auth/email/register - single-call registration, returns one-time plaintext key as_sk_....
• Auth: optional Authorization: Bearer <as_sk_...>; anonymous degrades to per-IP limits consuming the daily free quota; invalid key returns 401/403 with NO silent anonymous fallback.
• Free tier: 1000 requests/day, 20 QPS per key. Paid tier: unpriced (Coming Soon).
• Response envelope: success {code: 0, message: "success", request_id, data}; failure {code: -1, message}. Auth/quota errors carry no structured error_code (the message text is the signal); extract-specific errors do carry error_code (invalid_extract_url, extract_failed). No Retry-After header on 429.

2. Touch set (~10 layers, mirrors the xquik footprint)

Layer	File	Change
Registry entry	open-sse/config/searchRegistry.ts	anysearch-search entry + aliases anysearch, anysearch_search
Executor	open-sse/handlers/search/anysearchSearch.ts	buildAnysearchSearchRequest, normalizeAnysearchSearchResponse, AnysearchSearchEnvelopeError
Dispatch maps	open-sse/handlers/search.ts + searchProxy.ts	request-builder map + response-normalizer map; envelope error -> 402 (quota) / 502 (other)
Fetch executor	open-sse/executors/anysearch-fetch.ts + open-sse/handlers/webFetch.ts	POST /v1/extract; union + WEB_FETCH_PROVIDERS + dispatch case; quota envelope -> 402
UI catalog	src/shared/constants/providers/search.ts	metadata entry (serviceKinds: ["webSearch", "webFetch"]); authHint documents the 1000/day free tier
Credential validation	src/lib/providers/validation/searchProviders.ts	SEARCH_VALIDATOR_CONFIGS["anysearch-search"] (Bearer probe)
MCP	open-sse/mcp-server/schemas/tools.ts	fetch enum + web_search description
API schema	src/shared/validation/schemas/apiV1.ts, docs/openapi.yaml	alias canonicalization + provider enum
Docs	docs/reference/PROVIDER_REFERENCE.md, docs/frameworks/SEARCH_TOOLS_STUDIO.md, changelog.d/features/anysearch-search-provider.md	consistency copies
Tests	tests/unit/anysearch-search-provider.test.ts (8 cases), tests/unit/executor-anysearch-fetch.test.ts (2 cases), search-registry.test.ts, search-route.test.ts, tests/integration/search-providers-catalog.test.ts, tests/snapshots/executors/dispatch-rules.json	mirror xquik suite; catalog counts 20 search / 6 fetch (coexisting with nimble-search)

3. Decisions (all reached 2026-08-26)

1. Routing posture: fallbackOnly. Rationale: a cost-0 free provider must never dominate automatic cost routing; explicit selection and failover return are unaffected. Precedent: merged xquik entry.
2. Scope: webSearch + webFetch via POST /v1/extract in v1. Aligned with the tavily/exa dual-capability mental model. Vertical surfaces (tag, sub-domains, batch_search) stay out of scope — there is no IR for vertical params today.
3. Quota display: freeMonthlyQuota: 0 (xquik-style conservative display). The real allowance (1000 req/day, daily reset) is carried in the UI catalog authHint copy instead. Rationale: quota display must match reset semantics; converting a daily cap to a monthly-equivalent (30000) is a false promise the UI cannot honor.
4. searchTypes: ["web"] only. No public evidence of a news/images vertical in the AnySearch API; gateways integrating APIs without a documented vertical (e.g. Google Custom Search) expose web only rather than silently mapping news -> web.
5. Key posture: keyless works; an invalid key returns 401/403 and is never silently downgraded to anonymous (mirrors the upstream contract).
6. Deliberate exclusions: FETCH_BACKEND_TO_PROVIDER / FetchInterceptionBackend (chat interception stays firecrawl/jina/tavily); ANONYMOUS_CAPABLE_WEB_FETCH_PROVIDERS (anonymous remote endpoints share one IP-limited pool per egress IP, so keyless extract is opt-in, not an auto-routing candidate); QUOTA_STATUS_PROVIDERS (AnySearch signals quota via 429/envelope, not 402/403 status).

4. References

• xquik template: commit a0ceccc, PR #11370 (in-tree at release/v3.8.51).
• AnySearch official docs: https://anysearch.com/docs, https://anysearch.com/pricing; MCP catalog mcpservers.org/servers/anysearch-ai/anysearch-mcp-server; skill repo github.com/anysearch-ai/anysearch-skill.
• Industry mental model: LiteLLM search docs (registry + unified search() + Perplexity-spec IR), open-webui web search (built-in providers, search_web/fetch_url dual tools), Dify tool plugin pattern; cost-fallback ladder: self-hosted -> free quota -> paid.

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