Neo4j Agent Memory MCP Server

Instructions

Implementation Reference

• src/handlers/index.ts:250-263 (handler)

  Main handler for the 'update_connection' tool: validates args and delegates to Neo4jClient.updateRelationship
  case 'update_connection': { if (!isUpdateConnectionArgs(args)) { throw new McpError(ErrorCode.InvalidParams, 'Invalid update_connection arguments'); } const result = await neo4j.updateRelationship(args.fromMemoryId, args.toMemoryId, args.type, args.properties); return { content: [ { type: 'text', text: JSON.stringify(result, null, 2), }, ], }; }
• src/types.ts:34-39 (schema)

  TypeScript interface defining input shape for update_connection arguments
  export interface UpdateConnectionArgs { fromMemoryId: number; toMemoryId: number; type: string; properties: Record<string, any>; }
• src/types.ts:86-95 (schema)

  Runtime type guard/validator for UpdateConnectionArgs used in the handler
  export function isUpdateConnectionArgs(args: unknown): args is UpdateConnectionArgs { return ( typeof args === 'object' && args !== null && typeof (args as UpdateConnectionArgs).fromMemoryId === 'number' && typeof (args as UpdateConnectionArgs).toMemoryId === 'number' && typeof (args as UpdateConnectionArgs).type === 'string' && typeof (args as UpdateConnectionArgs).properties === 'object' ); }
• src/tools/definitions.ts:110-136 (registration)

  MCP tool definition and registration in the tools array, including name, description, and JSON schema
  { name: 'update_connection', description: 'Update properties of an existing connection between memories', 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: 'Relationship type to identify which connection to update (e.g. WORKS_AT, KNOWS, MANAGES)', }, properties: { type: 'object', description: 'Properties to update/add (e.g. {status: "completed", end_date: "2024-01"})', additionalProperties: true, }, }, required: ['fromMemoryId', 'toMemoryId', 'type', 'properties'], }, },
• src/neo4j-client.ts:101-114 (helper)

  Core implementation of relationship update using Neo4j Cypher query (MATCH, SET, RETURN)
  async updateRelationship(fromNodeId: number, toNodeId: number, relationType: string, properties: Neo4jQueryParams): Promise<any> { const result = await this.executeQuery( `MATCH (a)-[r:${relationType}]->(b) WHERE id(a) = $fromId AND id(b) = $toId SET r += $props RETURN r as relationship`, { fromId: neo4j.int(fromNodeId), toId: neo4j.int(toNodeId), props: properties, } ); return result[0]; }