Neo4j Agent Memory MCP Server

Instructions

Implementation Reference

• src/handlers/index.ts:280-292 (handler)

  Main handler logic for the delete_connection tool: validates arguments using isDeleteConnectionArgs and calls neo4j.deleteRelationship to perform the deletion.
  case 'delete_connection': { if (!isDeleteConnectionArgs(args)) { throw new McpError(ErrorCode.InvalidParams, 'Invalid delete_connection arguments'); } const result = await neo4j.deleteRelationship(args.fromMemoryId, args.toMemoryId, args.type); return { content: [ { type: 'text', text: JSON.stringify(result, null, 2), }, ], };
• src/neo4j-client.ts:128-140 (helper)

  Core implementation in Neo4jClient that executes the Cypher query to delete the specific relationship between two memory nodes.
  async deleteRelationship(fromNodeId: number, toNodeId: number, relationType: string): Promise<any> { const result = await this.executeQuery( `MATCH (a)-[r:${relationType}]->(b) WHERE id(a) = $fromId AND id(b) = $toId DELETE r RETURN count(r) as deletedCount`, { fromId: neo4j.int(fromNodeId), toId: neo4j.int(toNodeId), } ); return result[0]; }
• src/tools/definitions.ts:152-172 (registration)

  Tool registration defining the name, description, and JSON input schema for the MCP protocol.
  name: 'delete_connection', description: 'Delete a specific connection between two memories (use with caution - this permanently removes the relationship)', inputSchema: { type: 'object', properties: { fromMemoryId: { type: 'number', description: 'ID of the source memory', }, toMemoryId: { type: 'number', description: 'ID of the target memory', }, type: { type: 'string', description: 'Exact relationship type to delete (e.g. WORKS_AT, KNOWS, MANAGES)', }, }, required: ['fromMemoryId', 'toMemoryId', 'type'], }, },
• src/types.ts:45-49 (schema)

  TypeScript interface defining the expected arguments for delete_connection.
  export interface DeleteConnectionArgs { fromMemoryId: number; toMemoryId: number; type: string; }
• src/types.ts:105-113 (schema)

  Type guard function for validating delete_connection arguments before execution.
  export function isDeleteConnectionArgs(args: unknown): args is DeleteConnectionArgs { return ( typeof args === 'object' && args !== null && typeof (args as DeleteConnectionArgs).fromMemoryId === 'number' && typeof (args as DeleteConnectionArgs).toMemoryId === 'number' && typeof (args as DeleteConnectionArgs).type === 'string' ); }