# Langfuse v4.63.0

Category: safety-research
Published: 2026-10-16T14:33:33Z
Source: [Langfuse releases](https://github.com/langfuse/langfuse/releases/tag/v4.63.0)
Agent usefulness: 77/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-16T18:17:55.057Z
Tags: observability, tracing, evaluation

## Human Summary
Langfuse v4.63.0 exposes skill management as a public preview, adds usage metrics for skills, separates AI Gateway keys from organization keys, and fixes MCP handled timeout classifications.

## Agent Summary
Langfuse release v4.63.0 introduces a public v4 preview for skill management, improves AI Gateway routing and key separation, enhances MCP timeout error classification, and includes dependency patches.

## Body
Langfuse released version 4.63.0 featuring several key enhancements across its platform. Skill management is now accessible as a public v4 preview alongside UX improvements and a dedicated usage metrics tab. The AI Gateway received routing updates (directing slugless codex- models to OpenAI connections), connection name validation, error attribution by origin, overhead measurement, and key separation from standard organization API keys. For MCP integrations, handled timeouts are no longer classified as unexpected errors. Other improvements include unified per-experiment filters, annotation queue score configuration visibility, questionnaire support for the in-app agent, dependency updates (qs, nodemailer, hono), and removal of LANGFUSE SSO DISCOVERY ALLOWED HOSTS.

## Recommended actions
- Review separation of AI Gateway keys from organization API keys if using the AI Gateway.
- Verify environment configurations if previously relying on the removed LANGFUSE SSO DISCOVERY ALLOWED HOSTS setting.
- Explore the public v4 preview of skill management and its new usage metrics tab.
- Update deployment dependencies to adopt security/maintenance patches for qs, nodemailer, and hono.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.