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 instead of Langfuse Cloud if applicable. | https://cloud.langfuse.com |
| LANGFUSE_PUBLIC_KEY | No | Langfuse public API key (for example pk-lf-...). Required unless a profile is used. | |
| LANGFUSE_SECRET_KEY | No | Langfuse secret API key (for example sk-lf-...). Required unless a profile is used. | |
| LANGFUSE_MCP_PROFILE | No | Profile to load from the profiles file; same as --profile. Selects credentials from the profiles file instead of LANGFUSE_PUBLIC_KEY / LANGFUSE_SECRET_KEY. | |
| LANGFUSE_MAX_AGE_DAYS | No | Caps the lookback window for time-based tools such as fetch_traces and fetch_observations. Set to match your Langfuse instance's data retention. | 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 to the profiles file; same as --profiles-file. Defaults to ~/.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 MCP output mode used when clients omit the output_mode parameter. Supported values: compact, full_json_string, full_json_file. | compact |
| LANGFUSE_MCP_TRACE_TIMEOUT_SECONDS | No | Per-request read timeout in seconds for single-trace fetches such as fetch_trace with include_observations=true. 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
ResponsivenessNo issues