Langfuse MCP Server
Server Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| LANGFUSE_HOST | No | The URL of your Langfuse instance (use your own instance URL if self-hosted). Defaults to https://cloud.langfuse.com. | https://cloud.langfuse.com |
| LANGFUSE_PUBLIC_KEY | No | Langfuse public API key (e.g. pk-lf-...). Get it from Langfuse Cloud → Settings → API Keys. | |
| LANGFUSE_SECRET_KEY | No | Langfuse secret API key (e.g. sk-lf-...). Get it from Langfuse Cloud → Settings → API Keys. | |
| LANGFUSE_MCP_PROFILE | No | Profile to load from the profiles file; same as the --profile CLI flag. Selects a named project (host, public_key, secret_key) from the TOML profiles file. | |
| 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 for 30-day retention. | 7 |
| LANGFUSE_MCP_READ_ONLY | No | Set to true to disable all write operations for safer read-only access (same as the --read-only CLI flag). | false |
| LANGFUSE_MCP_PROFILES_FILE | No | Path of the profiles file; same as the --profiles-file CLI flag. 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 | Sets the MCP-exposed default output_mode so clients that omit the parameter automatically use your preferred mode (same as --default-output-mode). Supported values: compact, full_json_string, full_json_file. | compact |
| 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
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