phoenix

varize-phoenix-v16.5.0 scope: arize-phoenix Feature

This release adds 3 notable features for engineering teams evaluating rollout.

Published 2d Tracing

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✓ No known CVEs patched in this version

Topics

agents ai-monitoring ai-observability aiengineering anthropic datasets

+10 more

evals langchain llamaindex llm-eval llm-evaluation llmops llms openai prompt-engineering smolagents

Summary

AI summary

Updates 16.5.0, Bug Fixes, and 2026-06-01 across a mixed release.

Changes in this release

Type	Severity	Summary	CVE
Feature
Feature	Medium	add playground save prompt tool add playground save prompt tool Source: llm_adapter@2026-06-01 Confidence: high	—
Feature	Medium	add rewind, fork, and copy controls for chat messages in agent add rewind, fork, and copy controls for chat messages in agent Source: llm_adapter@2026-06-01 Confidence: high	—
Feature	Medium	add annotate-spans skill for the PXI agent add annotate-spans skill for the PXI agent Source: llm_adapter@2026-06-01 Confidence: high	—
Feature	Medium	add read_prompt_tools and write_prompt_tools to PXI add read_prompt_tools and write_prompt_tools to PXI Source: llm_adapter@2026-06-01 Confidence: high	—
Feature	Medium	add summary argument to PXI bash tool for UI preview add summary argument to PXI bash tool for UI preview Source: llm_adapter@2026-06-01 Confidence: high	—
Feature	Medium	seed default sandbox configs for local adapters in sandbox seed default sandbox configs for local adapters in sandbox Source: llm_adapter@2026-06-01 Confidence: high	—
Bugfix
Bugfix	Medium	surface descriptive errors for empty or non-JSON GraphQL responses in app surface descriptive errors for empty or non-JSON GraphQL responses in app Source: llm_adapter@2026-06-01 Confidence: high	—
Bugfix	Medium	return prompt label name as plain string in graphql return prompt label name as plain string in graphql Source: llm_adapter@2026-06-01 Confidence: high	—
Bugfix	Medium	pass project id to trace sparkline UI component pass project id to trace sparkline UI component Source: llm_adapter@2026-06-01 Confidence: high	—

Full changelog

16.5.0 (2026-06-01)

Features

add playground save prompt tool (#13517) (1641957)
agent: rewind, fork, and copy controls for chat messages (#13524) (f5df5ec)
agents: add annotate-spans skill for the PXI agent (#13523) (4b4f7a7)
agents: add read_prompt_tools and write_prompt_tools to PXI (#13509) (66a412b)
agents: add summary argument to PXI bash tool for UI preview (#13501) (16039bd)
sandbox: seed default sandbox configs for local adapters (#13486) (3bf7f3d)

Bug Fixes

app: surface descriptive errors for empty or non-JSON GraphQL responses (#13539) (dfe1bf8)
graphql: return prompt label name as plain string (#13562) (ebf0df7)
ui: pass project id to trace sparkline (#13552) (cc4e50a)

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Earlier breaking changes

varize-phoenix-v17.0.0 Adds system settings for admin-managed assistant enablement and trace recording policy
varize-phoenix-v16.0.0 Sandboxing and Code Evaluators introduce breaking changes in Phoenix v16.0.0.
varize-phoenix-v15.7.0 Removes v1 /chat route and associated code