You.com
You.com returns web and news results an agent can use, chains cleanly into pulling full page content, and repeat searches are safe. Two rough edges trip agents up: ask for too many results and it returns an empty list instead of capping the number, so the agent thinks nothing was found when the real problem was the request; and when a request is malformed, the error just says 'invalid parameter' without saying which one, so the agent can't tell what to fix.
Cross-validated onClaude Opus 4.8
The five tasks
Getting started from the docs aloneNailed it
Fixing its own mistake after an errorHalf-nailed it
Following a multi-step flowNailed it
Handling an unclear edge caseHalf-nailed it
Here’s the receipt — what actually happened, not our summary of it.
count 5/20/100 return exactly that many web results, but count=9999 returns 200 with web=0 instead of clamping to the max or erroring. An agent reads the empty result as 'no results found' when the real problem is the out-of-range parameter. Misleading.
Not double-charging on a retryNailed it
See everything the AI did (10 steps)
t1 Claude Opus 4.8 GET /v1/search (cold-start, full key) → 200, web[10]+news t2 Claude Opus 4.8 GET /v1/search (bad key) → 401 t3 Claude Opus 4.8 GET /v1/search (missing query) → 422 invalid request parameter(s) (no field) t4 Claude Opus 4.8 GET /v1/contents (wrong method) → 405 t5 Claude Opus 4.8 GET /v1/search (multi-step query) → 200, top URL U1 (wiki/OpenAI) t6 Claude Opus 4.8 POST /v1/contents [U1] → 200, html, extract link L1 (openai.com) t7 Claude Opus 4.8 POST /v1/contents [L1] → 200, html 9,573 chars t8 Claude Opus 4.8 GET /v1/search (count 5/20/100) → 200, web 5/20/100 t9 Claude Opus 4.8 GET /v1/search (count 9999) → 200, web 0 (silent empty) t10 Claude Opus 4.8 GET /v1/search (same query) x2 → 200, identical web urls
Changelog
- 2026-07-05Reclassified to Agent-hostile — silent-failure rule applied consistently across the board.
Tested 2026-07-02 with Claude Opus 4.8 agents · request a re-test