Change8

Arize Phoenix

AI & LLMs

AI Observability & Evaluation

Latest: @arizeai/phoenix-mcp@4.3.425 releases2 breaking changes4 common errorsView on GitHub

Release History

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@arizeai/phoenix-mcp@4.3.4
Aug 29, 2026

This patch release updates dependencies, specifically for the @arizeai/phoenix-client package to version 7.6.0.

@arizeai/phoenix-cli@1.16.2
Aug 29, 2026

This patch release updates dependencies, specifically for the @arizeai/phoenix-client package to version 7.6.0.

@arizeai/phoenix-client@7.6.02 features
Aug 29, 2026

Introduced a new `deletePrompt` helper for managing prompts and added a `PromptIdentifier` type for improved selector handling. The deletion process now cascades to all prompt versions.

arize-phoenix-v20.4.0Breaking12 fixes10 features
Aug 26, 2026

This release introduces new features like in-process Phoenix MCP toolset for agents, retrieval relevance evaluator, and AI Query for trace filter DSL. It also includes several bug fixes and dependency updates.

arize-phoenix-sqlean-v0.1.11 fix
Aug 25, 2026

This release bumps the bundled sqlean version for phoenix-sqlean to 0.28.4+10a13f9, addressing a bug fix.

arize-phoenix-evals-v3.5.11 fix
Aug 25, 2026

This release includes a bug fix that upgrades the anthropic SDK to version 1.

arize-phoenix-client-v3.3.01 feature
Aug 22, 2026

This release introduces a new feature enabling phoenix-gql mutations by default in manual mode, requiring approval. This change aims to streamline mutation workflows.

arize-phoenix-evals-v3.5.01 feature
Aug 21, 2026

This release introduces a new retrieval relevance evaluator for evals, enhancing the evaluation capabilities of the system.

arize-phoenix-v20.3.01 feature
Aug 17, 2026

Introduced an expression filter DSL for traces, enhancing filtering capabilities. This release focuses on improving trace analysis with new filtering options.

arize-phoenix-v20.2.11 fix
Aug 14, 2026

This release includes a bug fix for cost calculation by updating built-in model token prices.

arize-phoenix-client-v3.2.01 feature
Aug 14, 2026

This release introduces a new POST /traces/transfer endpoint to the server, enhancing trace management capabilities.

arize-phoenix-v20.2.01 fix1 feature
Aug 13, 2026

This release introduces a machine-readable approval decision for agents on gated PXI tools and updates built-in model token prices. Documentation has also been improved with the addition of Phoenix release notes and a reference for span & session filter expressions.

arize-phoenix-v20.1.02 fixes3 features
Aug 12, 2026

This release introduces JWT client assertion support for OAuth2 login and adds a new /traces/transfer endpoint. It also includes bug fixes for session ID collisions and OpenAI model routing.

arize-phoenix-client-v3.1.01 feature
Aug 11, 2026

This release introduces agent session persistence. It also includes miscellaneous chores related to the release process.

arize-phoenix-v20.0.04 fixes4 features
Aug 11, 2026

This release introduces semantic coloring for project metric tooltips and agent session persistence. It also includes several bug fixes and dependency updates, including the arize-phoenix-client to version 3.0.0.

arize-phoenix-client-v3.0.0Breaking5 fixes15 features
Aug 11, 2026

This release introduces significant updates including server-side PXI tracing, new REST endpoints for prompt metadata and experiment tags, and an OpenAI-compatible completions proxy. It also includes a breaking change in the client's formatter for generative AI.

arize-phoenix-v19.21.07 fixes2 features
Aug 10, 2026

This release introduces new features for tagging experiments and filtering sessions with AI queries. It also includes several bug fixes related to dependencies, error handling, and UI responsiveness.

arize-phoenix-otel-v0.17.12 fixes
Aug 10, 2026

This release includes bug fixes for the phoenix-otel component, specifically addressing README content and processor replacement logic. Documentation has also been updated across various features.

arize-phoenix-v19.20.02 fixes2 features
Aug 10, 2026

This release introduces new features for session turn copying and dataset split management via REST endpoints. It also includes bug fixes for project navigation and dependency updates.

arize-phoenix-v19.19.16 fixes
Aug 8, 2026

This release includes several bug fixes, performance improvements, and documentation updates. Key fixes involve handling OTLP paths, database operations, and resource leaks. Performance enhancements focus on SQLite connection pooling and UI rendering.

arize-phoenix-otel-v0.17.02 fixes1 feature
Aug 8, 2026

This release introduces support for phoenix environment files and includes several bug fixes for the phoenix-otel component. Documentation has also been updated across various features.

arize-phoenix-evals-v3.4.01 feature
Aug 8, 2026

This release introduces a new hallucination evaluator for evals, enhancing the model evaluation capabilities.

arize-phoenix-v19.19.01 fix1 feature
Aug 7, 2026

This release introduces UI improvements for LLM spans and a database-related bug fix by replacing sqlean.py with arize-phoenix-sqlean.

arize-phoenix-v19.18.02 fixes2 features
Aug 5, 2026

This release introduces a new REST endpoint for prompt metadata updates and an expression filter DSL for sessions. It also includes bug fixes for cost tracking and UI rendering.

arize-phoenix-sqlean-v0.1.01 feature
Aug 5, 2026

This release introduces the 'phoenix-sqlean' feature, which vendors nalgeon/sqlean.py as arize-phoenix-sqlean.

Common Errors

ChatCompletionSubscriptionError2 reports

The "ChatCompletionSubscriptionError" in arize-phoenix usually arises from insufficient OpenAI account credits or an expired/inactive subscription. To fix it, verify your OpenAI account has sufficient credits or that your paid subscription is active and properly linked to your Phoenix environment, then restart any relevant Phoenix processes. If using API keys, ensure they are valid and have appropriate permissions.

AssertionError2 reports

AssertionErrors in Arize Phoenix Anthropic streaming usually stem from unhandled event types within the `ParsedMessage` structure, specifically `ParsedMessageStopEvent` or `ParsedContentBlockStopEvent`. To resolve this, ensure your code includes explicit handling for these stop events, likely by adding new cases to your event-processing logic that gracefully exits or modifies the data stream. This might involve updating a switch statement or adding new conditional branches to properly manage these specific stop conditions.

DatatypeMismatchError1 report

DatatypeMismatchError in Phoenix often arises when filtering or comparing columns with incompatible data types (e.g., comparing a string to a number). To fix this, ensure the data types are consistent before applying filters or comparisons, using explicit type conversions if necessary (e.g., converting a string representation of a number to an integer/float using `astype`). Validate your data schema to confirm the correct data types are assigned to each column.

NotImplementedError1 report

The "NotImplementedError" in arize-phoenix usually means a requested function or method hasn't been defined for a specific class or integration, like a new model type. To fix it, either implement the missing method within the relevant class (e.g., for the Google ADK and Gemini Models, implement the Playground tool logic) or use a supported method if an alternative exists. Sometimes, upgrading to the newest version of the library will resolve this.

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