Provides expert knowledge about Neo4j, Cypher, GraphRAG, and knowledge graphs, answering questions with citations to official Neo4j documentation.
Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@Oscar how to create a vector index in Neo4j?"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
By Astra AI · oscar.theastraway.com
Oscar is an AI expert agent for knowledge graphs, Neo4j, GraphRAG, Cypher, and ontology engineering. He is grounded in the complete official Neo4j documentation corpus — Cypher Manual, Operations Manual, Graph Data Science (GDS), APOC, GenAI plugin, Getting Started, Drivers, and Aura — and answers with citations to the official docs. A 24/7 ingestion loop of new ML research papers keeps his knowledge current.
No hallucinated Cypher. No stale answers. Receipts on everything.
claude mcp add oscar -- npx -y github:theastraway/oscarAdd to your MCP config (claude_desktop_config.json, .cursor/mcp.json, etc.):
{
"mcpServers": {
"oscar": {
"command": "npx",
"args": ["-y", "github:theastraway/oscar"]
}
}
}That's it. Your agent now has an ask_oscar tool. Try:
"Ask Oscar how to create a vector index in Neo4j."
Set your key and the limits disappear:
{
"mcpServers": {
"oscar": {
"command": "npx",
"args": ["-y", "github:theastraway/oscar"],
"env": { "OSCAR_API_KEY": "your-key-here" }
}
}
}Get a key at oscar.theastraway.com.
Related MCP server: SOLVRO MCP - Knowledge Graph RAG System
curl -X POST https://oscar.theastraway.com/api/ask \
-H "Content-Type: application/json" \
-d '{"question": "When should I use a vector index vs a full-text index in Neo4j?"}'Pro (unlimited):
curl -X POST https://oscar.theastraway.com/api/ask \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $OSCAR_API_KEY" \
-d '{"question": "Design a GraphRAG retrieval strategy for a legal-documents graph."}'Response:
{
"answer": "…grounded answer with citations to the official Neo4j docs…",
"mode": "hybrid",
"tier": "free",
"remaining_today": 9
}Corpus | Coverage |
Cypher Manual | Full query-language syntax and semantics |
Operations Manual | Deployment, clustering, backup, security |
Graph Data Science (GDS) | Algorithms, embeddings, pipelines, projections |
APOC | The real procedures — no inventions |
GenAI plugin | Vector indexes, embeddings, similarity functions |
Getting Started + Drivers | Modeling basics, language drivers |
Aura | Managed-cloud specifics |
ML research feed | New papers ingested 24/7 (GraphRAG, agent memory, graph ML) |
Oscar is backed by MIND, Astra AI's persistent memory and knowledge-graph platform.
Tier | Price | Includes |
Free | $0 | 10 cited queries/day via API & MCP — no signup |
Pro | $20/mo | Unlimited fair-use queries, priority latency |
Team / API | $99/mo | 5 seats, dedicated API keys, higher rate limits |
Upgrade at oscar.theastraway.com.
index.js — the MCP server (stdio). npx -y github:theastraway/oscar
api/ask.js — the hosted query API (Vercel serverless)
public/ — oscar.theastraway.com
examples/ — curl, Python
Var | Where | Purpose |
| MCP client env | Pro key (optional — free tier needs nothing) |
| MCP client env | Override endpoint (testing/self-host) |
MIT © Astra AI, Inc.
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