Langfuse MCP Server
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| LANGFUSE_HOST | No | Langfuse instance URL. Use your self-hosted instance URL if applicable. | https://cloud.langfuse.com |
| LANGFUSE_PUBLIC_KEY | No | Langfuse public key (e.g. pk-lf-...). Required unless a profile is used. | |
| LANGFUSE_SECRET_KEY | No | Langfuse secret key (e.g. sk-lf-...). Required unless a profile is used. | |
| LANGFUSE_MCP_PROFILE | No | Profile to load from the profiles file; same as --profile. Selects a profile that supplies public_key, secret_key and host. | |
| 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 retention is 30 days. | 7 |
| LANGFUSE_MCP_READ_ONLY | No | Set to true to disable all write operations for safer read-only access. Same as --read-only. | |
| 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 when XDG_CONFIG_HOME is not set. | $XDG_CONFIG_HOME/langfuse-mcp/profiles.toml |
| LANGFUSE_MCP_DEFAULT_OUTPUT_MODE | No | Default output_mode for MCP tools. Supported values: compact, full_json_string, full_json_file. Same as --default-output-mode. | |
| LANGFUSE_MCP_TRACE_TIMEOUT_SECONDS | No | Per-request read timeout in 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
ActivityActive
ResponsivenessResponsive