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# Langfuse CLI Reference
## Install
```bash
# Run directly (recommended)
npx langfuse-cli api <resource> <action>
bunx langfuse-cli api <resource> <action>
# Or install globally
npm i -g langfuse-cli
langfuse api <resource> <action>
```
## Discovery
```bash
# List all resources and auth info
langfuse api __schema
# List actions for a resource
langfuse api <resource> --help
# Show args/options for a specific action
langfuse api <resource> <action> --help
# Preview the curl command without executing
langfuse api <resource> <action> --curl
```
## Credentials
Set environment variables:
```bash
export LANGFUSE_PUBLIC_KEY=pk-lf-...
export LANGFUSE_SECRET_KEY=sk-lf-...
export LANGFUSE_HOST=https://cloud.langfuse.com
```
## Tips
- Use `--json` for machine-readable JSON output
- Use `--curl` to preview the HTTP request without executing
- Pagination: use `--limit` and `--page` on list endpoints
- All list commands support filtering — check `<resource> <action> --help` for available options
- Prefer `observations-v2s` over `observations` — the v2 endpoint returns richer data
- Prefer `metrics-v2s` over `metrics` — the v2 endpoint returns richer data
- Prefer `score-v2s` over `scores` — the v1 `scores` resource only supports create/delete; use `score-v2s` for list and get operations
