Langfuse MCP Server
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| LANGFUSE_HOST | No | URL of the Langfuse instance. Use your own instance URL if self-hosted. Can also be passed via the --host flag or the selected profile. | https://cloud.langfuse.com |
| LANGFUSE_PUBLIC_KEY | Yes | Langfuse public API key (pk-...), from Langfuse Cloud → Settings → API Keys. Can also be passed via the --public-key flag or the selected profile. | |
| LANGFUSE_SECRET_KEY | Yes | Langfuse secret API key (sk-...), from Langfuse Cloud → Settings → API Keys. Can also be passed via the --secret-key flag or the selected profile. | |
| LANGFUSE_MCP_PROFILE | No | Profile to load from the profiles file; same as --profile. Selects which set of credentials to use. | |
| 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. | 7 |
| LANGFUSE_MCP_READ_ONLY | No | Set to true to disable all write operations for safer read-only access; same as --read-only. | false |
| LANGFUSE_MCP_PROFILES_FILE | No | Path of the profiles file; same as --profiles-file. | $XDG_CONFIG_HOME/langfuse-mcp/profiles.toml |
| LANGFUSE_MCP_DEFAULT_OUTPUT_MODE | No | Default MCP-exposed output_mode used when clients omit the parameter; same as --default-output-mode. Supported values: compact, full_json_string, full_json_file. | |
| 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
ActivityActive
ResponsivenessResponsive