YouTube Knowledge MCP

Instructions

Implementation Reference

• src/tools/knowledge-graph.ts:38-80 (handler)

  Main handler function that executes the generate_knowledge_graph tool. Parses input args using the schema, gathers video data, extracts concepts using LLM, merges them, builds the graph structure, enhances with clustering, and caches the result.

  async execute(args: unknown): Promise<KnowledgeGraph> {
    const params = GenerateKnowledgeGraphSchema.parse(args);
    
    this.logger.info(`Generating knowledge graph for ${params.videoIds.length} videos`);
  
    // Generate cache key
    const cacheKey = `knowledge_graph:${params.videoIds.sort().join(',')}:${params.graphDepth}`;
  
    // Check cache first
    const cached = await this.cache.get<KnowledgeGraph>(cacheKey);
    if (cached) {
      this.logger.info(`Returning cached knowledge graph for videos`);
      return cached;
    }
  
    try {
      // Step 1: Gather video data
      const videoData = await this.gatherVideoData(params);
  
      // Step 2: Extract concepts from each video
      const conceptExtractions = await this.extractConceptsFromVideos(videoData, params);
  
      // Step 3: Merge and deduplicate concepts
      const mergedConcepts = this.mergeConceptExtractions(conceptExtractions);
  
      // Step 4: Build knowledge graph structure
      const knowledgeGraph = await this.buildKnowledgeGraph(mergedConcepts, videoData, params);
  
      // Step 5: Enhance with clustering and analysis
      const enhancedGraph = await this.enhanceKnowledgeGraph(knowledgeGraph);
  
      // Cache the result
      await this.cache.set(cacheKey, enhancedGraph, 7200); // 2 hours cache
      
      this.logger.info(`Knowledge graph generated: ${enhancedGraph.nodes.length} nodes, ${enhancedGraph.edges.length} edges`);
      
      return enhancedGraph;
  
    } catch (error) {
      this.logger.error(`Failed to generate knowledge graph:`, error);
      throw error;
    }
  }

• src/types.ts:241-246 (schema)

  Zod schema defining the input parameters for the generate_knowledge_graph tool, used for validation in the handler.

  export const GenerateKnowledgeGraphSchema = z.object({
    videoIds: z.array(z.string()).min(2).max(20).describe('Array of YouTube video IDs to analyze'),
    focusTopics: z.array(z.string()).optional().describe('Specific topics to focus on'),
    includeTranscripts: z.boolean().default(true).describe('Whether to analyze video transcripts'),
    graphDepth: z.enum(['shallow', 'medium', 'deep']).default('medium').describe('Depth of knowledge graph analysis'),
  });

• src/index.ts:596-598 (registration)

  Registration in the tool dispatch switch statement: calls the KnowledgeGraphGenerator.execute() method when the tool is invoked.

  case 'generate_knowledge_graph':
    result = await this.knowledgeGraphTool.execute(args);
    break;

• src/index.ts:507-542 (registration)

  Tool specification registered in the listTools response, including name, description, and input schema matching the Zod schema.

  {
    name: 'generate_knowledge_graph',
    description: 'Create cross-video knowledge graphs showing concept relationships',
    inputSchema: {
      type: 'object',
      properties: {
        videoIds: {
          type: 'array',
          items: {
            type: 'string'
          },
          minItems: 2,
          maxItems: 10,
          description: 'YouTube video IDs to create knowledge graph from'
        },
        graphDepth: {
          type: 'string',
          enum: ['shallow', 'medium', 'deep'],
          default: 'medium',
          description: 'Depth of concept extraction and analysis'
        },
        focusTopics: {
          type: 'array',
          items: {
            type: 'string'
          },
          description: 'Specific topics to focus on (optional)'
        },
        includeTranscripts: {
          type: 'boolean',
          default: true,
          description: 'Include transcript content in analysis'
        }
      },
      required: ['videoIds']
    }

• src/index.ts:182-182 (registration)

  Instantiation of the KnowledgeGraphGenerator class instance used as the tool handler.

  this.knowledgeGraphTool = new KnowledgeGraphGenerator(this.youtubeClient, this.cache, this.llmService, this.transcriptProcessor, this.logger);