Langfuse MCP: now with Observations, Metrics, Scores, Comments and more

The hosted Langfuse MCP server now includes new tools for working with observations, metrics, scores, score configs, datasets, dataset items, dataset runs, dataset run items, comments, annotation queues, models, media, and health. Fifteen tool categories total.

Agents such as Claude Code, Linear Agents, or custom internal tools can now investigate a production issue, pull the relevant observation, query metrics, drop a comment for the team, create a score, or stage a dataset item for regression testing, all without leaving the chat.

The MCP server complements the Langfuse Skill (Day 2 of Launch Week 5) and the Langfuse CLI. Use the CLI when your agent can run bash and pre-filter data; use the MCP server when it cannot. Restrict to read-only by allow-listing lookup tools if you don't want writes.