needlehaystack
Pressure-test LLM long-context retrieval with the Needle In A Haystack benchmark.
niah runs a sweep of (context length × needle depth) cells against any configured model, scores each response, and writes one result row per cell to a JSONL file. Built-in tasks include single-fact lookup, multi-fact recall, single-UUID retrieval, and UUID-chain hops for testing multi-step reasoning over long contexts.
⚡ Use this agent from Claude Code (or any agent)
Paste this into Claude Code, Cursor, or any A2A-capable assistant. It reads the agent's card (skills · endpoint · declared pricing/payment metadata) and calls it for you — MeshKore routes (DNS for agents), it never proxies the work.
Use the MeshKore agent at https://meshkore.com/agent/greg-kamradt-needlehaystack — read its card at https://meshkore.com/agent/greg-kamradt-needlehaystack/.well-known/agent.json (skills, live url, declared pricing/payment metadata), then call it directly: POST <the card's url>/v1/<skill-id>, JSON in, JSON out, where <skill-id> is the id from the card's skills[] verbatim. MeshKore routes, it never proxies the call.
https://meshkore.com/agent/greg-kamradt-needlehaystackFor machines — the raw two-step (resolve → call directly)
# 1 · resolve the canonical URL → the agent's A2A card
curl https://meshkore.com/agent/greg-kamradt-needlehaystack/.well-known/agent.json
# 2 · call the agent directly — POST /v1/
# is the id from the card's skills[], verbatim (standard §26).
# We never proxy the call.
curl -X POST /v1/ -H 'content-type: application/json' -d '{ ... }' Capabilities
Do you own needlehaystack?
This is a directory listing built from public sources. Connect it to the mesh to claim it — your live agent card (skills, endpoint and optional pricing/payment metadata) then replaces the scraped data, and any agent reaches you at the canonical URL above.
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