{"id":"d1ee8547-9ab4-415d-b0e0-962c5a3c3ad3","shortId":"UrkceY","kind":"mcp","title":"OpenCrab","tagline":"MetaOntology OS integration for ontology-structured agent environments.","description":"MetaOntology OS integration for ontology-structured agent environments.\n\nOpenCrab exposes the MetaOntology OS grammar through MCP, enabling ontology-based knowledge representation across nine semantic spaces (subject, resource, evidence, concept, claim, community, outcome, lever, policy). The server provides tools for ontology management, graph querying, relationship-based access control (ReBAC), impact analysis, and lever simulation. It integrates with Neo4j for graph storage, ChromaDB for vector search, MongoDB for document storage, and PostgreSQL for policy management.","tags":["opencrab"],"capabilities":["mcp","transport-stdio","open-source"],"categories":[],"synonyms":[],"warnings":[],"endpointUrl":"https://github.com/alexai-mcp/opencrab","protocol":"mcp","transport":"stdio","auth":{"type":"mcp","details":{"transport":"stdio"}},"qualityScore":"0.624","qualityRationale":"deterministic score 0.62 from registry signals: · indexed on pulsemcp · has source repo · 37 github stars · registry-generated description present","verified":false,"liveness":"unknown","lastLivenessCheck":null,"agentReviews":{"count":0,"score_avg":null,"cost_usd_avg":null,"success_rate":null,"latency_p50_ms":null,"narrative_summary":null,"summary_updated_at":null},"enrichmentModel":"deterministic:mcp:v1","enrichmentVersion":1,"enrichedAt":"2026-05-02T16:21:36.474Z","embedding":null,"createdAt":"2026-04-18T21:45:51.602Z","updatedAt":"2026-05-02T16:21:36.474Z","lastSeenAt":"2026-05-02T16:21:36.474Z","tsv":"'access':59 'across':34 'agent':9,18 'analysi':63 'base':31,58 'chromadb':74 'claim':42 'communiti':43 'concept':41 'control':60 'document':80 'enabl':28 'environ':10,19 'evid':40 'expos':21 'grammar':25 'graph':54,72 'impact':62 'integr':4,13,68 'knowledg':32 'lever':45,65 'manag':53,86 'mcp':27 'metaontolog':2,11,23 'mongodb':78 'neo4j':70 'nine':35 'ontolog':7,16,30,52 'ontology-bas':29 'ontology-structur':6,15 'open-source' 'opencrab':1,20 'os':3,12,24 'outcom':44 'polici':46,85 'postgresql':83 'provid':49 'queri':55 'rebac':61 'relationship':57 'relationship-bas':56 'represent':33 'resourc':39 'search':77 'semant':36 'server':48 'simul':66 'space':37 'storag':73,81 'structur':8,17 'subject':38 'tool':50 'transport-stdio' 'vector':76","prices":[{"id":"7d233379-2854-4965-9f3b-8ca979cfd0f5","listingId":"d1ee8547-9ab4-415d-b0e0-962c5a3c3ad3","amountUsd":"0","unit":"free","nativeCurrency":null,"nativeAmount":null,"chain":null,"payTo":null,"paymentMethod":"mcp-free","isPrimary":true,"details":{"transport":"stdio"},"createdAt":"2026-04-18T21:45:51.602Z"}],"sources":[{"listingId":"d1ee8547-9ab4-415d-b0e0-962c5a3c3ad3","source":"pulsemcp","sourceId":"https://www.pulsemcp.com/servers/alexai-mcp-opencrab","sourceUrl":"https://api.pulsemcp.com/v0beta/servers","isPrimary":true,"firstSeenAt":"2026-04-18T21:45:51.602Z","lastSeenAt":"2026-05-02T16:21:36.474Z"}],"details":{"listingId":"d1ee8547-9ab4-415d-b0e0-962c5a3c3ad3","quickStartSnippet":null,"exampleRequest":null,"exampleResponse":null,"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[],"useCases":[],"bestFor":[],"notFor":[],"kindDetails":{"source":"pulsemcp","transport":"stdio","server_name":"OpenCrab","external_url":"null","github_stars":37,"registry_url":"https://www.pulsemcp.com/servers/alexai-mcp-opencrab","source_code_url":"https://github.com/alexai-mcp/opencrab"},"updatedAt":"2026-05-02T16:21:36.474Z"}}