Elasticsearch Knowledge Graph for MCP

Instructions

Implementation Reference

• src/kg-client.ts:1997-2051 (handler)

  Core handler function implementing the move_entities tool logic: copies entities (and optionally relations) from source zone to target zone, then deletes them from the source zone. Handles errors, overwrites, and skipping.
  async moveEntitiesBetweenZones( entityNames: string[], sourceZone: string, targetZone: string, options?: { moveRelations?: boolean; overwrite?: boolean; } ): Promise<{ entitiesMoved: string[]; entitiesSkipped: { name: string; reason: string }[]; relationsMoved: number; }> { if (sourceZone === targetZone) { throw new Error('Source and target zones must be different'); } // Default options const moveRelations = options?.moveRelations !== false; // First copy the entities const copyResult = await this.copyEntitiesBetweenZones( entityNames, sourceZone, targetZone, { copyRelations: moveRelations, overwrite: options?.overwrite } ); const result = { entitiesMoved: [] as string[], entitiesSkipped: copyResult.entitiesSkipped, relationsMoved: copyResult.relationsCopied }; // Delete copied entities from source zone for (const name of copyResult.entitiesCopied) { try { // Don't cascade relations when deleting from source, as we've already copied them await this.deleteEntity(name, sourceZone, { cascadeRelations: false }); result.entitiesMoved.push(name); } catch (error) { // If deletion fails, add to skipped list but keep the entity in the moved list // since it was successfully copied result.entitiesSkipped.push({ name, reason: `Entity was copied but could not be deleted from source: ${(error as Error).message}` }); } } return result; }
• src/index.ts:1246-1276 (handler)

  MCP server-side handler for move_entities tool calls: parses input parameters and delegates to KnowledgeGraphClient.moveEntitiesBetweenZones method.
  else if (toolName === "move_entities") { const names = params.names; const sourceZone = params.source_zone; const targetZone = params.target_zone; const moveRelations = params.move_relations !== false; const overwrite = params.overwrite === true; try { const result = await kgClient.moveEntitiesBetweenZones( names, sourceZone, targetZone, { moveRelations, overwrite } ); return formatResponse({ success: result.entitiesMoved.length > 0, entities_moved: result.entitiesMoved, entities_skipped: result.entitiesSkipped, relations_moved: result.relationsMoved }); } catch (error) { return formatResponse({ success: false, error: `Error moving entities: ${(error as Error).message}` }); } }
• src/index.ts:561-593 (schema)

  JSON Schema defining the input parameters for the move_entities tool, including required fields and descriptions.
  { name: "move_entities", description: "Move entities between zones (copy + delete from source).", inputSchema: { type: "object", properties: { names: { type: "array", items: { type: "string" }, description: "Entity names to move" }, source_zone: { type: "string", description: "Source zone" }, target_zone: { type: "string", description: "Target zone" }, move_relations: { type: "boolean", description: "Move related relationships (default: true)", default: true }, overwrite: { type: "boolean", description: "Overwrite if entity exists (default: false)", default: false } }, required: ["names", "source_zone", "target_zone"] } },
• src/index.ts:89-649 (registration)

  Tool registration in the MCP server's listTools handler, where move_entities is listed among available tools with its schema.
  server.setRequestHandler(ListToolsRequestSchema, async () => { return { tools: [ { name: "inspect_files", description: "Agent driven file inspection that uses AI to retrieve relevant content from multiple files.", inputSchema: { type: "object", properties: { file_paths: { type: "array", items: { type: "string" }, description: "Paths to the files (or directories) to inspect" }, information_needed: { type: "string", description: "Full description of what information is needed from the files, including the context of the information needed. Do not be vague, be specific. The AI agent does not have access to your context, only this \"information needed\" and \"reason\" fields. That's all it will use to decide that a line is relevant to the information needed. So provide a detailed specific description, listing all the details about what you are looking for." }, reason: { type: "string", description: "Explain why this information is needed to help the AI agent give better results. The more context you provide, the better the results will be." }, include_lines: { type: "boolean", description: "Whether to include the actual line content in the response, which uses more of your limited token quota, but gives more informatiom (default: false)" }, keywords: { type: "array", items: { type: "string" }, description: "Array of specific keywords related to the information needed. AI will target files that contain one of these keywords. REQUIRED and cannot be null or empty - the more keywords you provide, the better the results. Include variations, synonyms, and related terms." } }, required: ["file_paths", "information_needed", "include_lines", "keywords"], additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "inspect_knowledge_graph", description: "Agent driven knowledge graph inspection that uses AI to retrieve relevant entities and relations based on a query.", inputSchema: { type: "object", properties: { information_needed: { type: "string", description: "Full description of what information is needed from the knowledge graph, including the context of the information needed. Do not be vague, be specific. The AI agent does not have access to your context, only this \"information needed\" and \"reason\" fields. That's all it will use to decide that an entity is relevant to the information needed." }, reason: { type: "string", description: "Explain why this information is needed to help the AI agent give better results. The more context you provide, the better the results will be." }, include_entities: { type: "boolean", description: "Whether to include the full entity details in the response, which uses more of your limited token quota, but gives more information (default: false)" }, include_relations: { type: "boolean", description: "Whether to include the entity relations in the response (default: false)" }, keywords: { type: "array", items: { type: "string" }, description: "Array of specific keywords related to the information needed. AI will target entities that match one of these keywords. REQUIRED and cannot be null or empty - the more keywords you provide, the better the results. Include variations, synonyms, and related terms." }, memory_zone: { type: "string", description: "Memory zone to search in. If not provided, uses the default zone." }, entity_types: { type: "array", items: { type: "string" }, description: "Optional filter to specific entity types" } }, required: ["information_needed", "keywords"], additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "create_entities", description: "Create entities in knowledge graph (memory)", inputSchema: { type: "object", properties: { entities: { type: "array", items: { type: "object", properties: { name: {type: "string", description: "Entity name"}, entityType: {type: "string", description: "Entity type"}, observations: { type: "array", items: {type: "string"}, description: "Observations about this entity" } }, required: ["name", "entityType"] }, description: "List of entities to create" }, memory_zone: { type: "string", description: "Memory zone to create entities in." } }, required: ["entities", "memory_zone"], additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "update_entities", description: "Update entities in knowledge graph (memory)", inputSchema: { type: "object", properties: { entities: { type: "array", description: "List of entities to update", items: { type: "object", properties: { name: {type: "string"}, entityType: {type: "string"}, observations: { type: "array", items: {type: "string"} }, isImportant: {type: "boolean"} }, required: ["name"] } }, memory_zone: { type: "string", description: "Memory zone specifier. Entities will be updated in this zone." } }, required: ["entities", "memory_zone"], additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "delete_entities", description: "Delete entities from knowledge graph (memory)", inputSchema: { type: "object", properties: { names: { type: "array", items: {type: "string"}, description: "Names of entities to delete" }, memory_zone: { type: "string", description: "Memory zone specifier. Entities will be deleted from this zone." }, cascade_relations: { type: "boolean", description: "Whether to delete relations involving these entities (default: true)", default: true } }, required: ["names", "memory_zone"], additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "create_relations", description: "Create relationships between entities in knowledge graph (memory)", inputSchema: { type: "object", properties: { relations: { type: "array", description: "List of relations to create", items: { type: "object", properties: { from: {type: "string", description: "Source entity name"}, fromZone: {type: "string", description: "Optional zone for source entity, defaults to memory_zone or default zone. Must be one of the existing zones."}, to: {type: "string", description: "Target entity name"}, toZone: {type: "string", description: "Optional zone for target entity, defaults to memory_zone or default zone. Must be one of the existing zones."}, type: {type: "string", description: "Relationship type"} }, required: ["from", "to", "type"] } }, memory_zone: { type: "string", description: "Optional default memory zone specifier. Used if a relation doesn't specify fromZone or toZone." }, auto_create_missing_entities: { type: "boolean", description: "Whether to automatically create missing entities in the relations (default: true)", default: true } }, required: ["relations"], additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "delete_relations", description: "Delete relationships from knowledge graph (memory)", inputSchema: { type: "object", properties: { relations: { type: "array", description: "List of relations to delete", items: { type: "object", properties: { from: {type: "string", description: "Source entity name"}, to: {type: "string", description: "Target entity name"}, type: {type: "string", description: "Relationship type"} }, required: ["from", "to", "type"] } }, memory_zone: { type: "string", description: "Optional memory zone specifier. If provided, relations will be deleted from this zone." } }, required: ["relations"], additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "search_nodes", description: "Search entities using ElasticSearch query syntax. Supports boolean operators (AND, OR, NOT), fuzzy matching (~), phrases (\"term\"), proximity (\"terms\"~N), wildcards (*, ?), and boosting (^N). Examples: 'meeting AND notes', 'Jon~', '\"project plan\"~2'. All searches respect zone isolation.", inputSchema: { type: "object", properties: { query: { type: "string", description: "ElasticSearch query string." }, informationNeeded: { type: "string", description: "Important. Describe what information you are looking for, to give a precise context to the search engine AI agent. What questions are you trying to answer? Helps get more useful results." }, reason: { type: "string", description: "Explain why this information is needed to help the AI agent give better results. The more context you provide, the better the results will be." }, entityTypes: { type: "array", items: {type: "string"}, description: "Filter to specific entity types (OR condition if multiple)." }, limit: { type: "integer", description: "Max results (default: 20, or 5 with observations)." }, sortBy: { type: "string", enum: ["relevance", "recency", "importance"], description: "Sort by match quality, access time, or importance." }, includeObservations: { type: "boolean", description: "Include full entity observations (default: false).", default: false }, memory_zone: { type: "string", description: "Limit search to specific zone. Omit for default zone." }, }, required: ["query", "memory_zone", "informationNeeded", "reason"], additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "open_nodes", description: "Get details about specific entities in knowledge graph (memory) and their relations", inputSchema: { type: "object", properties: { names: { type: "array", items: {type: "string"}, description: "Names of entities to retrieve" }, memory_zone: { type: "string", description: "Optional memory zone to retrieve entities from. If not specified, uses the default zone." } }, required: ["names", "memory_zone"], additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "add_observations", description: "Add observations to an existing entity in knowledge graph (memory)", inputSchema: { type: "object", properties: { name: { type: "string", description: "Name of entity to add observations to" }, observations: { type: "array", items: {type: "string"}, description: "Observations to add to the entity" }, memory_zone: { type: "string", description: "Optional memory zone where the entity is stored. If not specified, uses the default zone." } }, required: ["memory_zone", "name", "observations"], additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "mark_important", description: "Mark entity as important in knowledge graph (memory) by boosting its relevance score", inputSchema: { type: "object", properties: { name: { type: "string", description: "Entity name" }, important: { type: "boolean", description: "Set as important (true - multiply relevance by 10) or not (false - divide relevance by 10)" }, memory_zone: { type: "string", description: "Optional memory zone specifier. If provided, entity will be marked in this zone." }, auto_create: { type: "boolean", description: "Whether to automatically create the entity if it doesn't exist (default: false)", default: false } }, required: ["memory_zone", "name", "important"], additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "get_recent", description: "Get recently accessed entities from knowledge graph (memory) and their relations", inputSchema: { type: "object", properties: { limit: { type: "integer", description: "Max results (default: 20 if includeObservations is false, 5 if true)" }, includeObservations: { type: "boolean", description: "Whether to include full entity observations in results (default: false)", default: false }, memory_zone: { type: "string", description: "Optional memory zone to get recent entities from. If not specified, uses the default zone." } }, required: ["memory_zone"], additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "list_zones", description: "List all available memory zones with metadata. When a reason is provided, zones will be filtered and prioritized based on relevance to your needs.", inputSchema: { type: "object", properties: { reason: { type: "string", description: "Reason for listing zones. What zones are you looking for? Why are you looking for them? The AI will use this to prioritize and filter relevant zones." } }, additionalProperties: false, "$schema": "http://json-schema.org/draft-07/schema#" } }, { name: "create_zone", description: "Create a new memory zone with optional description.", inputSchema: { type: "object", properties: { name: { type: "string", description: "Zone name (cannot be 'default')" }, shortDescription: { type: "string", description: "Short description of the zone." }, description: { type: "string", description: "Full zone description. Make it very descriptive and detailed." } }, required: ["name"] } }, { name: "delete_zone", description: "Delete a memory zone and all its entities/relations.", inputSchema: { type: "object", properties: { name: { type: "string", description: "Zone name to delete (cannot be 'default')" }, confirm: { type: "boolean", description: "Confirmation flag, must be true", default: false } }, required: ["name", "confirm"] } }, { name: "copy_entities", description: "Copy entities between zones with optional relation handling.", inputSchema: { type: "object", properties: { names: { type: "array", items: { type: "string" }, description: "Entity names to copy" }, source_zone: { type: "string", description: "Source zone" }, target_zone: { type: "string", description: "Target zone" }, copy_relations: { type: "boolean", description: "Copy related relationships (default: true)", default: true }, overwrite: { type: "boolean", description: "Overwrite if entity exists (default: false)", default: false } }, required: ["names", "source_zone", "target_zone"] } }, { name: "move_entities", description: "Move entities between zones (copy + delete from source).", inputSchema: { type: "object", properties: { names: { type: "array", items: { type: "string" }, description: "Entity names to move" }, source_zone: { type: "string", description: "Source zone" }, target_zone: { type: "string", description: "Target zone" }, move_relations: { type: "boolean", description: "Move related relationships (default: true)", default: true }, overwrite: { type: "boolean", description: "Overwrite if entity exists (default: false)", default: false } }, required: ["names", "source_zone", "target_zone"] } }, { name: "merge_zones", description: "Merge multiple zones with conflict resolution options.", inputSchema: { type: "object", properties: { source_zones: { type: "array", items: { type: "string" }, description: "Source zones to merge from" }, target_zone: { type: "string", description: "Target zone to merge into" }, delete_source_zones: { type: "boolean", description: "Delete source zones after merging", default: false }, overwrite_conflicts: { type: "string", enum: ["skip", "overwrite", "rename"], description: "How to handle name conflicts", default: "skip" } }, required: ["source_zones", "target_zone"] } }, { name: "zone_stats", description: "Get statistics for entities and relationships in a zone.", inputSchema: { type: "object", properties: { zone: { type: "string", description: "Zone name (omit for default zone)" } }, required: ["zone"] } }, { name: "get_time_utc", description: "Get the current UTC time in YYYY-MM-DD hh:mm:ss format", inputSchema: { type: "object", properties: {}, additionalProperties: false } } ] }; });
• src/kg-client.ts:1870-1985 (helper)

  Supporting helper function copyEntitiesBetweenZones used by moveEntitiesBetweenZones to perform the copy step before deletion.
  async copyEntitiesBetweenZones( entityNames: string[], sourceZone: string, targetZone: string, options?: { copyRelations?: boolean; overwrite?: boolean; } ): Promise<{ entitiesCopied: string[]; entitiesSkipped: { name: string; reason: string }[]; relationsCopied: number; }> { if (sourceZone === targetZone) { throw new Error('Source and target zones must be different'); } // Default options const copyRelations = options?.copyRelations !== false; const overwrite = options?.overwrite === true; await this.initialize(sourceZone); await this.initialize(targetZone); const result = { entitiesCopied: [] as string[], entitiesSkipped: [] as { name: string; reason: string }[], relationsCopied: 0 }; // Get entities from source zone for (const name of entityNames) { // Get the entity from source zone const entity = await this.getEntityWithoutUpdatingLastRead(name, sourceZone); if (!entity) { result.entitiesSkipped.push({ name, reason: `Entity not found in source zone '${sourceZone}'` }); continue; } // Check if entity exists in target zone const existingEntity = await this.getEntityWithoutUpdatingLastRead(name, targetZone); if (existingEntity && !overwrite) { result.entitiesSkipped.push({ name, reason: `Entity already exists in target zone '${targetZone}' and overwrite is disabled` }); continue; } // Copy the entity to target zone const { ...entityCopy } = entity; delete entityCopy.zone; // Zone will be set by saveEntity try { await this.saveEntity(entityCopy, targetZone); result.entitiesCopied.push(name); } catch (error) { result.entitiesSkipped.push({ name, reason: `Error copying entity: ${(error as Error).message}` }); continue; } } // Copy relations if requested if (copyRelations && result.entitiesCopied.length > 0) { // Get all relations for these entities in source zone const { relations } = await this.getRelationsForEntities(result.entitiesCopied, sourceZone); // Filter to only include relations where both entities were copied // or relations between copied entities and entities that already exist in target zone const relationsToCreate: ESRelation[] = []; for (const relation of relations) { let fromExists = result.entitiesCopied.includes(relation.from); let toExists = result.entitiesCopied.includes(relation.to); // If one side of the relation wasn't copied, check if it exists in target zone if (!fromExists) { const fromEntityInTarget = await this.getEntityWithoutUpdatingLastRead(relation.from, targetZone); fromExists = !!fromEntityInTarget; } if (!toExists) { const toEntityInTarget = await this.getEntityWithoutUpdatingLastRead(relation.to, targetZone); toExists = !!toEntityInTarget; } // Only create relations where both sides exist if (fromExists && toExists) { relationsToCreate.push(relation); } } // Save the filtered relations for (const relation of relationsToCreate) { try { await this.saveRelation({ from: relation.from, to: relation.to, relationType: relation.relationType }, targetZone, targetZone); result.relationsCopied++; } catch (error) { console.error(`Error copying relation from ${relation.from} to ${relation.to}: ${(error as Error).message}`); } } } return result; }