Langfuse MCP Server
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| LANGFUSE_HOST | No | Langfuse instance URL. Defaults to https://cloud.langfuse.com; use your own instance URL when self-hosted. Passed via CLI flag --host or this environment variable. | |
| LANGFUSE_PUBLIC_KEY | Yes | Langfuse public key (from Langfuse Cloud → Settings → API Keys). Passed via CLI flag --public-key or this environment variable. | |
| LANGFUSE_SECRET_KEY | Yes | Langfuse secret key (from Langfuse Cloud → Settings → API Keys). Passed via CLI flag --secret-key or this environment variable. | |
| LANGFUSE_MCP_PROFILE | No | Profile to load from the profiles file; same as --profile. Selects a Langfuse project profile. | |
| LANGFUSE_MAX_AGE_DAYS | No | Caps the lookback window for time-based tools (fetch_traces, fetch_observations, etc.). Set to match your Langfuse instance's data retention — e.g. 30 if your retention is 30 days. | 7 |
| LANGFUSE_MCP_READ_ONLY | No | Disable all write operations for safer read-only access, e.g. LANGFUSE_MCP_READ_ONLY=true langfuse-mcp. Same as the --read-only flag. | |
| LANGFUSE_MCP_PROFILES_FILE | No | Path of the profiles file; same as --profiles-file. Defaults to $XDG_CONFIG_HOME/langfuse-mcp/profiles.toml (or ~/.config/langfuse-mcp/profiles.toml). | |
| LANGFUSE_MCP_DEFAULT_OUTPUT_MODE | No | MCP-exposed default output_mode so clients that omit the parameter automatically use your preferred mode. Supported values: compact, full_json_string, full_json_file. Same as --default-output-mode. | |
| LANGFUSE_MCP_TRACE_TIMEOUT_SECONDS | No | Per-request read timeout (seconds) for single-trace fetches (fetch_trace). Raise it if large traces with include_observations=True time out. Must be a positive integer. | 120 |
Instructions
Guidance the server publishes about itself, which clients place ahead of the tool catalog so the model reads it before choosing anything.
This server publishes no instructions, or was last inspected before Glama recorded them.
Capabilities
Server capabilities have not been inspected yet.
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
No tools | |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
This server cannot be deployed
Maintenance
ActivityMaintained
ResponsivenessNo issues