# arize-phoenix: v20.11.0

Category: safety-research
Published: 2026-09-12T04:26:27Z
Source: [Arize Phoenix releases](https://github.com/Arize-ai/phoenix/releases/tag/arize-phoenix-v20.11.0)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-19T00:17:44.787Z
Tags: observability, evaluation, tracing

## Human Summary
Arize Phoenix releases published arize-phoenix: v20.11.0. 20.11.0 (https://github.com/Arize-ai/phoenix/compare/arize-phoenix-v20.10.0...arize-phoenix-v20.11.0) (2026-09-12) Features annotations: add GraphQL mutations for span, trace, and session notes ( 16053 (https://github.com/Arize-ai/phoenix/issues/16053)) ( e374a4d…

## Agent Summary
Treat arize-phoenix: v20.11.0 as an official release signal. Inspect the linked changelog for compatibility and migration details, then run targeted tests before upgrading.

## Body
Arize Phoenix releases published arize-phoenix: v20.11.0. This release-watch entry was generated from the project's official GitHub release feed and is kept separate from human-reviewed editorial analysis. Release notes: 20.11.0 (https://github.com/Arize-ai/phoenix/compare/arize-phoenix-v20.10.0...arize-phoenix-v20.11.0) (2026-09-12) Features annotations: add GraphQL mutations for span, trace, and session notes ( 16053 (https://github.com/Arize-ai/phoenix/issues/16053)) ( e374a4d (https://github.com/Arize-ai/phoenix/commit/e374a4d92afc7852da4479abffd6c42e1391230b)) mcp: serve the shared skills root on the /mcp mount ( 15726 (https://github.com/Arize-ai/phoenix/issues/15726)) ( dd2e22d (https://github.com/Arize-ai/phoenix/commit/dd2e22dd0d9adb315c130150312b9163b98e48b5)) skills: add phoenix-error-analysis skill ( 15727 (https://github.com/Arize-ai/phoenix/issues/15727)) ( df349f2 (https://github.com/Arize-ai/phoenix/commit/df349f2bad089dfa5088c8947dee1f9b2d11a205)) Bug Fixes mcp: carry lifespan state into in-process tool dispatch ( 16109 (https://github.com/Arize-ai/phoenix/issues/16109)) ( a516ac3…

## Recommended actions
- Review the official Arize Phoenix releases release notes before upgrading.
- Check compatibility, migration, and security notes against your current agent stack.
- Run focused regression tests before production rollout.

## 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.