{"version":"1.0","type":"card","id":"70ff5d46-8612-4292-9f4d-5f3b9fb06a62","url":"https://stacklist.com/card/70ff5d46-8612-4292-9f4d-5f3b9fb06a62","title":"ACP: the Atomic Content Protocol","source_url":"https://stacklist.com/acp","note":"MCP standardized how agents connect to data. ACP standardizes what the data looks like when it arrives — portable Markdown objects with identity, provenance, and relationships built in.","image":{"url":"https://ucarecdn.com/9a2ba574-f9c2-4c55-932b-6727d5249bb1/","alt":"ACP: the Atomic Content Protocol","width":3120,"height":2160},"stack":{"id":"c252b545-15f1-411c-bb29-d4d420615f73","title":"Stacklist Resources","url":"https://stacklist.com/stack/c252b545-15f1-411c-bb29-d4d420615f73"},"created_at":"2026-10-03T04:01:46.858Z","updated_at":null,"aco":{"summary":"Atomic Content Protocol (ACP) is a standardized format for structuring content with YAML frontmatter that carries identity, provenance, and relationships, reducing token consumption by 98% through enriched metadata. ACP v0.2 ships as a production-ready open standard readable by any LLM, MCP server, or text editor, solving the format problem that MCP left unsolved.","tags":["atomic-content-protocol","knowledge-representation","mcp","token-economy","semantic-metadata"],"key_entities":[{"name":"John McCarthy","type":"person","confidence":0.85},{"name":"Atomic Content Protocol","type":"technology","confidence":0.98},{"name":"Model Context Protocol","type":"technology","confidence":0.97},{"name":"Knowledge representation and reasoning","type":"concept","confidence":0.92},{"name":"Semantic network","type":"concept","confidence":0.88},{"name":"Stacklist","type":"organization","confidence":0.95}],"classification":"reference","language":"en","confidence":0.85,"provenance":{"model":"claude-haiku-4-5","tool":"@stacklist/be@0.1.0","confidence":0.85,"timestamp":"2026-10-03T04:01:50.825Z"},"token_counts":{"approximate":1307,"cl100k":1188},"content_hash":"sha256:050b2ee7dc190567143b24b0f974b32fe41bff1cd6a603a5232a15811f9d6041","acp_version":"0.2","body_available":true,"body_tokens":1307,"visibility":"public","agent_accessible":true,"status":"final"},"_links":{"self":"/api/public/card/70ff5d46-8612-4292-9f4d-5f3b9fb06a62.json","html":"https://stacklist.com/card/70ff5d46-8612-4292-9f4d-5f3b9fb06a62","md":"/api/public/card/70ff5d46-8612-4292-9f4d-5f3b9fb06a62.md","stack_json":"/api/public/stack/c252b545-15f1-411c-bb29-d4d420615f73.json"}}