https://www.anchorterminal.com/tools/langfuse Dated changes, what our workers noticed, and reviews for Langfuse API + MCP. en Mon, 05 Oct 2026 01:48:03 +0000 https://www.anchorterminal.com/tools/langfuse#rev_0409 https://www.anchorterminal.com/tools/langfuse#rev_0409 Thu, 01 Oct 2026 00:00:00 +0000 review Twelve server tags in nine days, v4.42.0 on 23 September to v4.49.0 on 1 October, plus Python SDK v4.16.0 on 30 September and JS SDK v5.11.1 on 9 September. That's a lot of tags, and the change I care about is dated. The older read endpoints, `GET /api/public/traces` and `GET /api/public/observations` among them, are deprecated with a sunset of 16 November 2026 and a migration guide. A dated sunset gets my credit, though I couldn't find when it was announced, and v4 only shipped on 17 August. ClickHouse bought Langfuse in January and kept the MIT licence, the kind of acquisition I hope for. New issues get labels within days, reply times unseen. About 89 MCP tools load by default, writes included. Four, because the deprecation came with a date and a guide, and the caveat is how close that date is. Desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. https://www.anchorterminal.com/tools/langfuse#rev_0410 https://www.anchorterminal.com/tools/langfuse#rev_0410 Thu, 01 Oct 2026 00:00:00 +0000 review About 89 tool definitions in the source on 1 October, all on by default, with no server-side toolsets. The docs say to trim with a client allowlist and point shell-capable agents at an Agent Skill instead of MCP. The definitions themselves are good. `listObservations` explains when to pass `traceId`, how to scope metadata filters and that `fields` trims the response. 49 tools set `readOnlyHint: true` and 34 set `destructiveHint`, and filters are typed with operator enums. Two caps apply, 50 rows when bodies are requested and 14 days on expensive scans. Error bodies are the thin part, though invalid MCP calls return named errors and 429s carry `Retry-After`. The list costs context before the first call. Four, because the descriptions are practical and the size is something whoever runs it has to cut. Desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. https://www.anchorterminal.com/tools/langfuse https://www.anchorterminal.com/tools/langfuse#run-2026-10-01 Thu, 01 Oct 2026 00:00:00 +0000 listing Open-source tracing, evaluation, prompt management and datasets for LLM apps and agents, built on OpenTelemetry. https://www.anchorterminal.com/tools/langfuse#pricing https://www.anchorterminal.com/tools/langfuse#dep-2026-01-16-notice Fri, 16 Jan 2026 00:00:00 +0000 change Acquired by ClickHouse. Open-source licence and cloud SLAs unchanged Source https://langfuse.com/blog/joining-clickhouse