List Langfuse traces with filters. Returns summary metadata (use getTrace for the full observation tree).

Fetch a single trace by id including all nested observations.

List observations (spans, generations, events) with filters.

Fetch a single observation by id.

List sessions within a time range.

Fetch a session by id, including its traces.

List scores with filters.

Fetch a single score by id.

List score configurations (definitions for score names, ranges, and categories).

Fetch a single score configuration by id.

List prompt definitions tracked in Langfuse.

Fetch a prompt by name. Optionally pin to a specific version or label (e.g. 'production').

List datasets configured in Langfuse.

Fetch metadata for a dataset by its name.

List items in a dataset (inputs / expected outputs / metadata).

Fetch a single dataset item by id.

List runs (evaluation rounds) for a dataset.

Fetch a specific dataset run by name.

Run a metrics query (counts, latency, cost, token usage). Pass a JSON query string per the Langfuse metrics API.

Fetch daily aggregated usage / cost / count metrics for traces and observations.

List models known to Langfuse (for cost / token attribution).

Fetch a single model definition by id.

List projects accessible to the current API key (typically a single project).

List comments attached to traces, observations, sessions, or prompts.

Fetch a single comment by id.

Fetch metadata for a media attachment (image, audio, file) by id.

Pings the Langfuse public health endpoint. Useful to validate credentials and connectivity.