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Implements MCP resource and tool handlers that translate client requests into LangSmith REST API calls, with automatic authentication via API key management and response serialization back to the MCP client.","intents":["Query execution traces and runs from Claude without leaving the conversation context","Inspect LLM chain execution details, token counts, and latency metrics during debugging","Retrieve historical run data to analyze model behavior patterns across multiple invocations","Access structured trace metadata for post-hoc analysis and observability reporting"],"best_for":["LLM application developers using Claude as their primary development interface","Teams building multi-agent systems who need real-time observability into LangSmith traces","Developers integrating LangSmith observability into MCP-based AI workflows"],"limitations":["Read-only access to traces and runs — cannot create or modify traces through MCP interface","Latency depends on LangSmith API response times; no local caching of trace data","Requires valid LangSmith API key with appropriate permissions; no fallback for unauthenticated access","MCP protocol overhead adds ~50-200ms per request compared to direct SDK calls"],"requires":["Node.js 16+ runtime","LangSmith API key (from https://smith.langchain.com)","MCP-compatible client (Claude Desktop, or other MCP host)","Network access to api.smith.langchain.com"],"input_types":["MCP tool calls with JSON parameters (run IDs, trace IDs, filter criteria)","MCP resource URIs identifying specific traces or runs"],"output_types":["JSON-serialized trace objects with execution metadata","Structured run data including timestamps, inputs, outputs, and token counts","Error responses with diagnostic information"],"categories":["tool-use-integration","observability"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-langsmith-mcp-server__cap_1","uri":"capability://tool.use.integration.mcp.server.lifecycle.management.and.resource.discovery","name":"mcp server lifecycle management and resource discovery","description":"Implements the MCP server specification for TypeScript, handling protocol initialization, capability negotiation, and resource/tool registration. Manages the request-response cycle for MCP clients, including proper error handling, timeout management, and graceful shutdown. Provides introspectable resource and tool schemas that allow clients to discover available LangSmith operations and their parameters.","intents":["Start and configure an MCP server that exposes LangSmith capabilities to Claude Desktop or other MCP hosts","Discover available LangSmith operations and their required parameters from within an MCP client","Handle connection lifecycle events and ensure clean shutdown of the server process","Validate incoming MCP requests and return properly formatted responses"],"best_for":["Developers setting up local MCP servers for Claude Desktop integration","Teams deploying MCP servers in containerized or serverless environments","Builders creating MCP-based observability dashboards or automation workflows"],"limitations":["Single-threaded request handling — concurrent requests are queued sequentially","No built-in load balancing or horizontal scaling; designed for single-client or low-concurrency scenarios","Requires explicit server startup and configuration; no auto-discovery mechanism for MCP hosts","Error messages may leak internal API details if not properly sanitized"],"requires":["Node.js 16+","TypeScript 4.5+ (if building from source)","MCP client that supports the MCP specification (e.g., Claude Desktop 0.1+)"],"input_types":["MCP initialization messages with client capabilities","MCP tool call requests with JSON parameters","MCP resource read requests with URI identifiers"],"output_types":["MCP capability advertisements (list of available tools and resources)","MCP tool execution results with JSON payloads","MCP error responses with diagnostic codes"],"categories":["tool-use-integration","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-langsmith-mcp-server__cap_2","uri":"capability://safety.moderation.langsmith.api.authentication.and.credential.management","name":"langsmith api authentication and credential management","description":"Manages LangSmith API authentication by accepting and validating API keys, constructing properly authenticated HTTP requests to the LangSmith API, and handling token refresh or expiration scenarios. Stores credentials securely (typically via environment variables or MCP configuration) and injects them into all outbound requests as Authorization headers. Implements error handling for authentication failures with clear diagnostic messages.","intents":["Authenticate requests to LangSmith API using a valid API key without exposing credentials in logs","Handle authentication errors gracefully and provide actionable error messages when credentials are invalid or expired","Support multiple authentication methods or credential sources (environment variables, config files, MCP parameters)","Ensure all LangSmith API calls include proper authorization headers"],"best_for":["Developers deploying MCP servers in shared or production environments where credential security is critical","Teams managing multiple LangSmith projects with different API keys per environment","Builders integrating LangSmith observability into larger MCP-based automation systems"],"limitations":["Credentials must be provided at server startup; no runtime credential rotation without server restart","No built-in credential encryption — relies on OS-level environment variable security","API key is transmitted in plaintext over HTTPS; vulnerable if HTTPS is compromised","No support for OAuth or other modern authentication flows; API key only"],"requires":["Valid LangSmith API key from https://smith.langchain.com/settings/api-keys","Environment variable or MCP configuration mechanism to pass credentials securely","HTTPS connectivity to api.smith.langchain.com"],"input_types":["API key string (typically 32-64 characters)","MCP configuration parameters or environment variables"],"output_types":["Authenticated HTTP requests with Authorization headers","Authentication error responses with diagnostic codes (401, 403)"],"categories":["safety-moderation","tool-use-integration"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-langsmith-mcp-server__cap_3","uri":"capability://search.retrieval.trace.and.run.data.retrieval.with.filtering.and.pagination","name":"trace and run data retrieval with filtering and pagination","description":"Implements MCP tools and resources that query the LangSmith API for trace and run data, supporting filtering by project, date range, status, and other metadata. Handles pagination of large result sets and transforms LangSmith's REST API responses into structured JSON suitable for MCP clients. Supports both resource-based access (fetch a specific trace by ID) and tool-based queries (search runs by criteria).","intents":["Retrieve a specific trace or run by ID to inspect its execution details and metadata","Search for runs matching specific criteria (project, date range, status) to analyze patterns","Paginate through large result sets without loading all data into memory at once","Export trace data in a structured format for analysis or reporting"],"best_for":["Developers debugging specific LLM invocations by querying their traces from Claude","Teams analyzing run performance metrics across multiple projects","Builders creating observability dashboards or automated alerting based on trace data"],"limitations":["Query performance depends on LangSmith API response times; no local indexing or caching","Pagination requires explicit offset/limit parameters; no cursor-based pagination support","Large trace objects (with full token logs) may exceed MCP message size limits","Filtering is limited to LangSmith API's supported query parameters; complex custom filters not supported"],"requires":["Valid LangSmith API key with read access to traces and runs","Project ID or name to filter results (if querying specific projects)","Network access to api.smith.langchain.com"],"input_types":["Trace or run ID (UUID string)","Filter parameters: project name, date range, status, tags","Pagination parameters: offset, limit"],"output_types":["Trace objects with execution metadata, inputs, outputs, and token counts","Run objects with status, duration, and error information","Paginated result sets with total count and has_more indicators"],"categories":["search-retrieval","data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-langsmith-mcp-server__cap_4","uri":"capability://data.processing.analysis.structured.trace.metadata.extraction.and.serialization","name":"structured trace metadata extraction and serialization","description":"Transforms raw LangSmith trace and run objects into structured JSON that preserves key metadata (timestamps, token counts, latency, error messages, input/output payloads) while filtering out internal or verbose fields. Implements custom serialization logic to handle nested objects, arrays, and special types (dates, errors) in a way that's suitable for MCP message transmission. Ensures output is deterministic and suitable for downstream analysis or logging.","intents":["Extract key metrics from traces (latency, token usage, cost) for performance analysis","Serialize trace data into a compact JSON format suitable for MCP message transmission","Preserve error messages and stack traces from failed runs for debugging","Format trace metadata for human-readable display in Claude or other MCP clients"],"best_for":["Developers analyzing LLM performance metrics and token usage patterns","Teams building observability dashboards that consume trace data from MCP","Builders creating automated alerting or anomaly detection based on trace metrics"],"limitations":["Serialization may truncate very large payloads (e.g., full token logs) to fit MCP message size limits","Custom serialization logic may not preserve all LangSmith fields; some metadata may be lost","Nested object depth is limited by MCP message size constraints","Timestamp formatting may differ from LangSmith's native format; requires client-side parsing"],"requires":["Raw trace or run objects from LangSmith API","Knowledge of which fields are relevant for the use case"],"input_types":["LangSmith trace objects (JSON from API)","LangSmith run objects (JSON from API)","Configuration specifying which fields to include/exclude"],"output_types":["Serialized JSON with flattened metadata","Formatted timestamp strings (ISO 8601 or custom format)","Aggregated metrics (total tokens, latency, cost)"],"categories":["data-processing-analysis"],"confidence":0.5,"matches":0,"success_rate":0},{"id":"npm_npm-langsmith-mcp-server__cap_5","uri":"capability://safety.moderation.error.handling.and.diagnostic.reporting.for.api.failures","name":"error handling and diagnostic reporting for api failures","description":"Implements comprehensive error handling for LangSmith API failures, including HTTP error codes (401, 403, 404, 500), network timeouts, and malformed responses. Translates LangSmith API errors into MCP-compatible error responses with diagnostic codes and human-readable messages. Logs errors for debugging while avoiding credential leakage in error messages.","intents":["Diagnose authentication failures (invalid or expired API key) with clear error messages","Handle API rate limiting gracefully and inform clients when to retry","Report network or connectivity issues without exposing internal server details","Provide actionable error messages that guide developers toward resolution"],"best_for":["Developers troubleshooting MCP server connectivity or LangSmith API issues","Teams deploying MCP servers in production and needing robust error reporting","Builders creating automated error handling or retry logic in MCP clients"],"limitations":["Error messages may not include full context from LangSmith API; some details are filtered for security","No automatic retry logic; clients must implement their own retry strategies","Timeout handling depends on Node.js HTTP client defaults; not configurable per request","Error codes may not map 1:1 with LangSmith API codes; translation layer may obscure root cause"],"requires":["Network connectivity to api.smith.langchain.com","Proper error handling in MCP client to interpret error responses"],"input_types":["HTTP error responses from LangSmith API","Network timeouts or connection failures","Malformed or unexpected API responses"],"output_types":["MCP error responses with diagnostic codes (e.g., 'INVALID_API_KEY', 'RATE_LIMITED')","Human-readable error messages","Retry-after hints for rate-limited requests"],"categories":["safety-moderation","automation-workflow"],"confidence":0.5,"matches":0,"success_rate":0}],"trust":{"score":26,"verified":false,"data_access_risk":"high","permissions":["Node.js 16+ runtime","LangSmith API key (from https://smith.langchain.com)","MCP-compatible client (Claude Desktop, or other MCP host)","Network access to api.smith.langchain.com","Node.js 16+","TypeScript 4.5+ (if building from source)","MCP client that supports the MCP specification (e.g., Claude Desktop 0.1+)","Valid LangSmith API key from https://smith.langchain.com/settings/api-keys","Environment variable or MCP configuration mechanism to pass credentials securely","HTTPS connectivity to api.smith.langchain.com"],"failure_modes":["Read-only access to traces and runs — cannot create or modify traces through MCP interface","Latency depends on LangSmith API response times; no local caching of trace data","Requires valid LangSmith API key with appropriate permissions; no fallback for unauthenticated access","MCP protocol overhead adds ~50-200ms per request compared to direct SDK calls","Single-threaded request handling — concurrent requests are queued sequentially","No built-in load balancing or horizontal scaling; designed for single-client or low-concurrency scenarios","Requires explicit server startup and configuration; no auto-discovery mechanism for MCP hosts","Error messages may leak internal API details if not properly sanitized","Credentials must be provided at server startup; no runtime credential rotation without server restart","No built-in credential encryption — relies on OS-level environment variable security","builder identity is not verified yet","no observed match outcomes yet"],"rank_breakdown":{"adoption":0.05,"quality":0.22,"ecosystem":0.39999999999999997,"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":"2026-05-24T12:16:23.903Z","last_scraped_at":"2026-04-22T08:09:31.413Z","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-langsmith-mcp-server","compare_url":"https://unfragile.ai/compare?artifact=npm-langsmith-mcp-server"}},"signature":"ZQTDzBA2AUbhtKeUQW3iHFlyMQlVmVCUFxLh1NV1XFmiQZSWeqzkla7yijdNeEND4+8ubTokmFixNqwctkpJCw==","signedAt":"2026-06-20T08:23:05.979Z","signedBy":"unfragile.ai","version":1},"_links":{"self":"https://unfragile.ai/api/v1/passport/npm-langsmith-mcp-server","artifact":"https://unfragile.ai/npm-langsmith-mcp-server","verify":"https://unfragile.ai/api/v1/verify?slug=npm-langsmith-mcp-server","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"}}