{"type":"post","id":"cisco-open-sources-project-quarry-a-detection-language-0f4c65","slug":"cisco-open-sources-project-quarry-a-detection-language-0f4c65","title":"Cisco open-sources Project Quarry, a detection language for multi-step AI agent attacks","description":"Cisco has open-sourced Project Quarry, a rule language and evaluation engine for finding harmful or disallowed behavior across an AI agent’s full execution trace.","retrieval_nugget":"Cisco has open-sourced Project Quarry, a rule language and evaluation engine for finding harmful or disallowed behavior across an AI agent’s full execution trace. For teams building tool-using agents, it offers a way to express and inspect multi-step attack patterns that per-call controls and message classifiers can miss.","published_at":"2026-10-28","updated_at":"2026-10-28","record_date":"2026-10-28","date_kind":"published_at","topics":["agent-security","prompt-injection"],"entities":["Cisco","Project Quarry","Model Context Protocol","OpenAI","Hugging Face","Snort","YARA","Sigma"],"related_patterns":["agent-security-moves-to-runtime-boundaries","agent-ready-software-exposes-capabilities"],"novelty_label":"new_fact","what_changed":"Cisco open-sourced Project Quarry, a language for detecting multi-step AI-agent attacks; the archive’s OpenAI-agent incident is related context, not this release.","prior_refs":["memory:97e33f88-84d5-8442-a306-d55cc9f37ba7"],"source_url":"https://blogs.cisco.com/ai/project-quarry-agent-security-detections","source_urls":["https://blogs.cisco.com/ai/project-quarry-agent-security-detections"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:cisco-open-sources-project-quarry-a-detection-language-0f4c65","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/cisco-open-sources-project-quarry-a-detection-language-0f4c65/","markdown":"https://newruntime.com/posts/cisco-open-sources-project-quarry-a-detection-language-0f4c65.md","json":"https://newruntime.com/posts/cisco-open-sources-project-quarry-a-detection-language-0f4c65.json"},"next_reads":[{"type":"topic","path":"/topics/agent-security/","url":"https://newruntime.com/topics/agent-security/","title":"Agent Security","reason":"Explore the agent-security topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/agent-security.md","json_url":"https://newruntime.com/topics/agent-security.json"},{"type":"topic","path":"/topics/prompt-injection/","url":"https://newruntime.com/topics/prompt-injection/","title":"Prompt Injection","reason":"Explore the prompt-injection topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/prompt-injection.md","json_url":"https://newruntime.com/topics/prompt-injection.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}