{"passport":{"unfragile":{"@version":"1.0","version":"2026-05","artifact":{"id":"npm_npm-mcpflow-router","slug":"npm-mcpflow-router","name":"mcpflow-router","type":"mcp","url":"https://www.npmjs.com/package/mcpflow-router","page_url":"https://unfragile.ai/npm-mcpflow-router","categories":["mcp-servers"],"tags":["mcp","model-context-protocol","router","bm25","tool-routing","opencode","claude-code"],"pricing":{"model":"open_source","free":true,"starting_price":null},"status":"active","verified":false},"capabilities":[{"id":"npm_npm-mcpflow-router__cap_0","uri":"capability://search.retrieval.bm25.based.semantic.tool.discovery.and.ranking","name":"bm25-based semantic tool discovery and ranking","description":"Implements BM25 full-text search algorithm to index and rank available MCP tools based on semantic relevance to user queries. The router builds an inverted index from tool names, descriptions, and metadata, then scores candidate tools using TF-IDF-like ranking to surface the most contextually appropriate tools without requiring vector embeddings or external search services.","intents":["Find the right MCP tool from a large registry based on natural language description of what I need to accomplish","Rank multiple candidate tools by relevance so the LLM can choose the best one for a specific task","Search across tool metadata (names, descriptions, parameters) to discover tools I didn't know existed"],"best_for":["LLM agents with access to 50+ MCP tools needing fast, local relevance ranking","Teams building tool-rich MCP servers without vector database infrastructure","Developers optimizing for latency-sensitive tool selection in agentic workflows"],"limitations":["BM25 is lexical-only — cannot understand semantic similarity between synonyms or conceptually related tools without explicit metadata","Ranking quality depends entirely on tool metadata quality; poorly documented tools will rank lower regardless of actual capability","No learned ranking — cannot adapt to user preferences or historical tool usage patterns over time"],"requires":["Node.js 16+","MCP server with tool definitions including name and description fields","Tool registry accessible at runtime (in-memory or via MCP protocol)"],"input_types":["text (natural language query)","structured tool metadata (JSON schema with name, description, parameters)"],"output_types":["ranked array of tool references","relevance scores (numeric)","tool metadata with scoring context"],"categories":["search-retrieval","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-mcpflow-router__cap_1","uri":"capability://tool.use.integration.on.demand.lazy.loading.of.mcp.tool.definitions","name":"on-demand lazy loading of mcp tool definitions","description":"Implements lazy-loading pattern where tool definitions are fetched and parsed only when needed, rather than loading the entire tool registry into memory at startup. The router maintains a lightweight index of available tools and resolves full definitions (parameters, schemas, examples) on-demand through MCP protocol calls, reducing initialization time and memory footprint for large tool ecosystems.","intents":["Start an MCP agent quickly without waiting for all 100+ tool definitions to load","Reduce memory usage when only a small subset of available tools will be used in a session","Dynamically add or remove tools from the registry without restarting the router"],"best_for":["Serverless/edge deployments with strict memory constraints","MCP servers with hundreds of tools where most sessions use only a handful","Microservice architectures where tool availability changes dynamically"],"limitations":["First use of a tool incurs network latency for definition fetch — cannot be fully eliminated, only cached","Requires MCP server to support on-demand tool introspection; incompatible with static tool lists","No built-in caching strategy — repeated tool lookups will re-fetch unless caching layer is added externally"],"requires":["MCP server implementing tool introspection/discovery protocol","Network connectivity to MCP server (local or remote)","Node.js 16+ with async/await support"],"input_types":["tool identifier (string)","MCP protocol messages"],"output_types":["parsed tool definition (JSON schema)","tool metadata with resolved parameters"],"categories":["tool-use-integration","memory-knowledge"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-mcpflow-router__cap_2","uri":"capability://tool.use.integration.smart.tool.routing.with.context.aware.selection","name":"smart tool routing with context-aware selection","description":"Routes incoming requests to appropriate MCP tools by combining BM25 relevance scoring with optional context awareness (conversation history, previous tool usage, user intent signals). The router maintains a scoring pipeline that ranks candidates and can apply custom filtering rules or constraints before returning the top-N tool recommendations to the LLM or agent.","intents":["Automatically select the best tool for a user request without explicit tool specification","Provide ranked alternatives when multiple tools could handle a task","Apply domain-specific routing rules (e.g., prefer local tools over remote, or prioritize fast tools for real-time tasks)"],"best_for":["LLM agents that need to choose from many tools without explicit user guidance","Multi-tool MCP servers where tool selection is non-obvious from the request alone","Systems requiring deterministic, auditable tool selection (vs. LLM-based tool choice)"],"limitations":["Context-aware routing requires explicit context passing — no automatic conversation history integration","Scoring is deterministic but not adaptive — cannot learn from tool execution failures to improve future routing","Custom routing rules must be implemented by the user; no built-in rule engine"],"requires":["Tool registry with searchable metadata","BM25 index built and maintained","Optional: context object (conversation history, user metadata) for enhanced routing"],"input_types":["text query","optional context object (JSON)","optional routing constraints (JSON)"],"output_types":["ranked list of tool references","routing decision metadata","confidence scores per tool"],"categories":["tool-use-integration","planning-reasoning"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-mcpflow-router__cap_3","uri":"capability://tool.use.integration.mcp.protocol.native.tool.registry.integration","name":"mcp protocol-native tool registry integration","description":"Integrates directly with the Model Context Protocol (MCP) standard for tool definition and invocation, parsing MCP tool schemas (JSON Schema format) and translating between MCP protocol messages and internal routing decisions. The router acts as a middleware layer that understands MCP semantics natively, including tool parameters, return types, and error handling conventions.","intents":["Work seamlessly with any MCP-compliant server without custom adapters","Automatically parse and validate tool schemas defined in MCP format","Route requests through the MCP protocol stack without losing schema information"],"best_for":["Teams already invested in MCP ecosystem (Claude, other MCP-compatible clients)","Building tool routers that need to work with heterogeneous MCP servers","Developers who want MCP-first architecture without custom protocol translation"],"limitations":["Tightly coupled to MCP protocol version — breaking changes in MCP spec require router updates","Limited to MCP-compatible tool definitions — cannot route non-MCP tools without wrapping","Requires MCP server to expose tools via standard protocol; proprietary tool formats need translation layer"],"requires":["MCP server (local or remote)","MCP client library or protocol implementation","Tool definitions in MCP JSON Schema format"],"input_types":["MCP protocol messages","tool schemas (JSON Schema)","MCP resource/tool references"],"output_types":["MCP protocol responses","tool invocation results","error messages in MCP format"],"categories":["tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-mcpflow-router__cap_4","uri":"capability://search.retrieval.tool.metadata.indexing.and.search.optimization","name":"tool metadata indexing and search optimization","description":"Builds and maintains an inverted index of tool metadata (names, descriptions, parameter names, tags, examples) to enable fast full-text search across the tool registry. The indexing process tokenizes and normalizes metadata, applies BM25 weighting, and stores the index in memory for sub-millisecond query latency. Index updates can be incremental when tools are added/removed.","intents":["Search for tools by keyword or phrase across a large registry in real-time","Index tool parameters and examples to find tools that work with specific data types","Rebuild or update the search index when tools are added or removed from the MCP server"],"best_for":["MCP servers with 50+ tools where search performance is critical","Interactive tool discovery interfaces (CLI, web UI) requiring sub-100ms search latency","Systems where tool registry changes frequently and index must be updatable"],"limitations":["In-memory index limits scalability — very large registries (1000+ tools) may exceed available RAM","Index updates are not atomic — concurrent tool additions during search may cause inconsistency","No persistence — index is rebuilt from scratch on router restart; no disk-based caching"],"requires":["Tool registry with searchable metadata fields","Sufficient RAM for in-memory index (typically <1MB per 100 tools)","Node.js 16+ with Map/Set data structures"],"input_types":["tool metadata (JSON)","search query (text)","indexing configuration (JSON)"],"output_types":["search results (ranked array)","index statistics (size, document count)","relevance scores"],"categories":["search-retrieval","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-mcpflow-router__cap_5","uri":"capability://tool.use.integration.tool.parameter.validation.and.schema.enforcement","name":"tool parameter validation and schema enforcement","description":"Validates tool invocation requests against MCP tool schemas, ensuring parameters match expected types, required fields are present, and constraints (min/max, enum values, pattern matching) are satisfied. The validator parses JSON Schema definitions from tool metadata and applies validation rules before routing the request to the actual tool implementation, preventing invalid invocations.","intents":["Prevent invalid tool calls by validating parameters before execution","Provide clear error messages when tool parameters don't match schema expectations","Enforce type safety and constraints defined in tool schemas"],"best_for":["Production MCP agents where invalid tool calls could cause failures or data corruption","Systems requiring strict schema compliance and audit trails","Teams building tool-heavy agents where parameter validation is critical"],"limitations":["Validation adds latency (~5-50ms per request depending on schema complexity)","Only validates against JSON Schema — custom validation logic requires user implementation","Does not validate tool execution results — only input parameters"],"requires":["Tool definitions with JSON Schema format","JSON Schema validator library (built-in or external)","Tool metadata accessible at validation time"],"input_types":["tool parameters (JSON)","tool schema (JSON Schema)","validation rules (JSON)"],"output_types":["validation result (pass/fail)","error messages with field-level details","normalized parameters (coerced to correct types)"],"categories":["tool-use-integration","safety-moderation"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":27,"verified":false,"data_access_risk":"moderate","permissions":["Node.js 16+","MCP server with tool definitions including name and description fields","Tool registry accessible at runtime (in-memory or via MCP protocol)","MCP server implementing tool introspection/discovery protocol","Network connectivity to MCP server (local or remote)","Node.js 16+ with async/await support","Tool registry with searchable metadata","BM25 index built and maintained","Optional: context object (conversation history, user metadata) for enhanced routing","MCP server (local or remote)"],"failure_modes":["BM25 is lexical-only — cannot understand semantic similarity between synonyms or conceptually related tools without explicit metadata","Ranking quality depends entirely on tool metadata quality; poorly documented tools will rank lower regardless of actual capability","No learned ranking — cannot adapt to user preferences or historical tool usage patterns over time","First use of a tool incurs network latency for definition fetch — cannot be fully eliminated, only cached","Requires MCP server to support on-demand tool introspection; incompatible with static tool lists","No built-in caching strategy — repeated tool lookups will re-fetch unless caching layer is added externally","Context-aware routing requires explicit context passing — no automatic conversation history integration","Scoring is deterministic but not adaptive — cannot learn from tool execution failures to improve future routing","Custom routing rules must be implemented by the user; no built-in rule engine","Tightly coupled to MCP protocol version — breaking changes in MCP spec require router updates","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.05,"quality":0.22,"ecosystem":0.5000000000000001,"match_graph":0.25,"freshness":0.6,"weights":{"adoption":0.25,"quality":0.25,"ecosystem":0.15,"match_graph":0.23,"freshness":0.12}},"observed_outcomes":{"matches":0,"success_rate":0,"avg_confidence":0,"top_intents":[],"last_matched_at":null},"maintenance":{"status":"active","updated_at":"2026-05-24T12:16:23.904Z","last_scraped_at":"2026-04-22T08:11:28.156Z","last_commit":null},"community":{"stars":null,"forks":null,"weekly_downloads":null,"model_downloads":null,"model_likes":null}},"distribution":{"claim_url":"https://unfragile.ai/submit?claim=npm-mcpflow-router","compare_url":"https://unfragile.ai/compare?artifact=npm-mcpflow-router"}},"signature":"VWkv0G7MJAbIzEK4DBqQmVHoLGDUO3VA93gTArQ4xDCkHDqm4U2wTQTdL7ECCJKBt5UdQcP/FN0beDnmSuQsBA==","signedAt":"2026-06-20T09:27:41.289Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/npm-mcpflow-router","artifact":"https://unfragile.ai/npm-mcpflow-router","verify":"https://unfragile.ai/api/v1/verify?slug=npm-mcpflow-router","publicKey":"https://unfragile.ai/api/v1/trust-passport-public-key","spec":"https://unfragile.ai/trust","schema":"https://unfragile.ai/schema.json","docs":"https://unfragile.ai/docs"}}