A production-grade MCP server that connects any MCP-compatible AI agent to your Langfuse observability data. Query traces, debug errors, inspect
A production-grade MCP server that connects any MCP-compatible AI agent to your Langfuse observability data. Query traces, debug errors, inspect sessions, manage
public-key + secret-key) ---Compare MCP servers by category, or browse hosted MCP servers if you prefer an endpoint over a local process.
Check the linked publisher documentation and your connected client's tool list. Names and availability can vary with the server version and account permissions.
| Tool | What it does |
|---|---|
| fetch_traces | Paginated list of traces. Filter by userId, name, sessionId, tags, fromTimestamp, toTimestamp. |
| fetch_trace | Full detail of a single trace including nested observations, input/output, metadata, latency, and token usage. Requires traceId. |
| find_exceptions | Traces whose level equals ERROR. Supports time range and pagination. |
| find_exceptions_in_file | Error-level traces whose metadata contains a given file name substring. Requires fileName. |
| get_exception_details | Full detail of a single error trace. Requires traceId. |
| get_error_count | Count of ERROR-level traces in a time range (scans up to 500 traces). |
| delete_trace | Permanently deletes a single trace by ID. **Irreversible.** |
| delete_traces | Permanently deletes multiple traces. Pass a comma-separated list of trace IDs. **Irreversible.** |
| fetch_sessions | Paginated list of sessions with optional time range filter. |
| get_session_details | Full session detail including all its traces. Requires sessionId. |
| get_user_sessions | All sessions for a specific user with pagination. Requires userId. |
| list_prompts | Paginated list of all prompts in the project. |
| get_prompt | Fetch a prompt by name. Optionally pin to a version number or a label (e.g. production, staging). |
| create_prompt | Create a new prompt or append a new version to an existing prompt. type is text (plain string) or chat (JSON array of {role, content} messages). Supports comma-separated labels and tags. |
public-key + secret-key) ---| Variable | Description | Required |
|---|---|---|
| LANGFUSE_PUBLIC_KEY | Credential the server authenticates with. | Yes |
| LANGFUSE_SECRET_KEY | Credential the server authenticates with. | Yes |
| LANGFUSE_HOST | Endpoint or connection string the server talks to. | Optional |
| LANGFUSE_TIMEOUT | Configuration value read at startup. | Optional |
Give your coding agent the full DevTools toolbox: traces, network, console, heap snapshots and Lighthouse.
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