Langfuse MCP Server
by joaoogawa
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| LANGFUSE_HOST | No | The Langfuse instance URL. Use your own instance URL if self-hosted. Defaults to https://cloud.langfuse.com. | |
| LANGFUSE_PUBLIC_KEY | No | Your Langfuse public key (pk-...), from your Langfuse instance under Settings → API Keys. | |
| LANGFUSE_SECRET_KEY | No | Your Langfuse secret key (sk-...), from your Langfuse instance under Settings → API Keys. | |
| LANGFUSE_MCP_PROFILE | No | Profile to load from the profiles file; same as the --profile option. Each of public_key, secret_key and host in a profile takes a literal value, or a <field>_env key that names the environment variable that holds the value. | |
| 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. Defaults to 7. | |
| LANGFUSE_MCP_READ_ONLY | No | Set to true to disable all write operations for safer read-only access. Same as the --read-only option. Defaults to false. | |
| LANGFUSE_MCP_PROFILES_FILE | No | Path of the profiles file; same as the --profiles-file option. Defaults to $XDG_CONFIG_HOME/langfuse-mcp/profiles.toml (or ~/.config/langfuse-mcp/profiles.toml when XDG_CONFIG_HOME is not set). | |
| LANGFUSE_MCP_DEFAULT_OUTPUT_MODE | No | MCP-exposed default output_mode so clients that omit the parameter automatically use your preferred mode. Same as the --default-output-mode option. Supported values: compact, full_json_string, full_json_file. | |
| 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. Defaults to 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