Neo4j Knowledge Graph MCP Server
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| DEBUG | No | Enable debug mode (true/false) | |
| LOG_LEVEL | No | Log level: debug, info, warn, error, silent | warn |
| NEO4J_URI | No | Neo4j server URI | bolt://127.0.0.1:7687 |
| RERANK_MODEL | No | Reranker model name (optional) | |
| RERANK_TOP_K | No | Default return count with reranker | 5 |
| RERANK_TOP_N | No | Number of candidates for reranker scoring | 20 |
| NEO4J_DATABASE | No | Neo4j database name | neo4j |
| NEO4J_PASSWORD | Yes | Neo4j password (required) | |
| NEO4J_USERNAME | No | Neo4j username | neo4j |
| OPENAI_API_KEY | No | OpenAI API key (optional; alternative to EMBEDDING_API_KEY) | |
| RERANK_API_KEY | No | Reranker API key (optional; falls back to EMBEDDING_API_KEY) | |
| RERANK_ENABLED | No | Enable cross-encoder reranker (true/false) | false |
| EMBEDDING_MODEL | No | Embedding model name (optional) | |
| RERANK_ENDPOINT | No | Reranker endpoint URL (optional) | |
| EMBEDDING_API_KEY | No | API key for alternative embedding provider (optional) | |
| RERANK_ACCOUNT_ID | No | Reranker account ID (optional) | |
| RERANK_TIMEOUT_MS | No | Reranker timeout in milliseconds | 5000 |
| NEO4J_VECTOR_INDEX | No | Vector index name | entity_embeddings |
| EMBEDDING_DIMENSIONS | No | Embedding dimensions (must match NEO4J_VECTOR_DIMENSIONS) (optional) | |
| EMBEDDING_API_BASE_URL | No | Base URL for alternative embedding provider (optional) | |
| EMBEDDING_API_ENDPOINT | No | Full endpoint URL for alternative embedding provider (optional; overrides base URL) | |
| OPENAI_EMBEDDING_MODEL | No | OpenAI embedding model name | text-embedding-3-small |
| EMBEDDING_BACKFILL_CRON | No | Cron schedule for embedding backfill | 0 19 * * * |
| NEO4J_VECTOR_DIMENSIONS | No | Vector dimensions | 1536 |
| EMBEDDING_STALE_CLAIM_MS | No | Stale claim timeout in milliseconds | 300000 |
| RERANK_MAX_PASSAGE_CHARS | No | Max characters for reranker passage | 2000 |
| WRITE_EMBEDDINGS_LOCALLY | No | Whether to write embeddings locally (true/false) | true |
| ENABLE_PROMETHEUS_METRICS | No | Enable Prometheus metrics endpoint (true/false) | false |
| NEO4J_SIMILARITY_FUNCTION | No | Similarity function (cosine|euclidean) | cosine |
Capabilities
Features and capabilities supported by this server
| Capability | Details |
|---|---|
| tools | {} |
| logging | {} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| create_entitiesC | Create multiple new entities in your knowledge graph system |
| create_relationsC | Create multiple new relations between entities in your knowledge graph. Relations should be in active voice |
| add_observationsB | Add new observations to existing entities in your knowledge graph |
| delete_entitiesA | Delete multiple entities and their associated relations from your knowledge graph |
| delete_observationsB | Delete specific observations from entities in your knowledge graph |
| delete_relationsB | Delete multiple relations from your knowledge graph |
| get_relationC | Get a specific relation with its enhanced properties from your knowledge graph |
| update_relationC | Update an existing relation with enhanced properties in your knowledge graph |
| read_graphC | Read the entire knowledge graph system |
| search_nodesC | Search for nodes in your knowledge graph based on a query |
| open_nodesB | Open specific nodes in your knowledge graph by their names |
| semantic_searchB | Search for entities semantically using vector embeddings and similarity in your knowledge graph |
| get_entity_embeddingC | Get the vector embedding for a specific entity from your knowledge graph |
| create_entities_batchB | Create multiple entities in a single optimized batch operation (10-50x faster than individual creates) |
| create_relations_batchA | Create multiple relations in a single optimized batch operation (10-50x faster than individual creates) |
| add_observations_batchA | Add observations to multiple entities in a single optimized batch operation (10-50x faster than individual adds) |
| update_entities_batchB | Update multiple entities in a single optimized batch operation (10-50x faster than individual updates) |
| get_entity_historyB | Get the version history of an entity from your knowledge graph |
| get_relation_historyB | Get the version history of a relation from your knowledge graph |
| get_graph_at_timeB | Get your knowledge graph as it existed at a specific point in time |
| get_decayed_graphB | Get your knowledge graph with confidence values decayed based on time |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
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