Arize released Phoenix v19.21.0 on 2026-08-10, introducing REST endpoints for setting tags on experiments and an AI-powered query interface for session filtering1. The release also updates arize-phoenix-evals to 3.4.0 and caps the Vercel dependency below 0.8. Bug fixes address malformed Monty error payloads in MCP, object-typed parameter casting for TypeScript compilation, JSON schema coercion in LLM tool attributes, and responsive chart resizing via debouncing.
Arize Phoenix v19.21.0 Adds Experiment Tagging API, AI Session Filtering
Arize Phoenix v19.21.0, released 2026-08-10, adds REST endpoints for experiment tagging, AI session filtering, evals update to 3.4.0, and multiple bug…
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