Python 4.2.0

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This release also collects the changes from 4.1.2 through 4.1.10, which shipped to PyPI without a GitHub release.

✨ New Feature

• Features/voice (#3036 by @penguine-ip) 4.1.10
• support user credentials for Vertex AI (#3017 by @ykocaogullar) 4.1.8
• add support for mcp servers (#3046 by @tanayvaswani) 4.1.8
• Add SDK support for golden update and delete (#2945 by @A-Vamshi) 4.1.6
• Revamp DAG metrics to be constructed in a top-down approach (#2912 by @A-Vamshi) 4.1.3
• support server-driven login questionnaires (#2938 by @penguine-ip) 4.1.3

⚡ Improvement

• update changelogs for 2026 till August's latest release (#3106 by @A-Vamshi)
• drop retired model ids from the model pages (#3074 by @chiruu12) 4.1.10
• typescript docs (#2996 by @kritinv) 4.1.6
• . (#2990 by @penguine-ip) 4.1.5
• document StylingConfig and ConversationalStylingConfig for Synthesizer (#2932 by @jsaimanoj) 4.1.3
• tag llms.txt Confident AI links with UTMs (#2920 by @tonycueva) 4.1.2

🐛 Bug Fix

• Refactor metrics to standardize score. (Higher is better) (#3102 by @A-Vamshi)
• remove coercive and PII prompt content that trips provider guardrails (#3071 by @Patwaji) 4.1.10
• record zero token counts and per-token rates on LLM spans (#3069 by @Anai-Guo) 4.1.10
• honor include_reason and align sync/async reason generation (#3061 by @biztex) 4.1.10
• use final score token for logprob weighting (#3060 by @tunglambk) 4.1.10
• align CSV context delimiters with save_as output (#3049 by @Koustav-github) 4.1.10
• respect CONFIDENT_REGION setting in backend routing (#3041 by @lorenzozanee) 4.1.10
• reject a root node that is reachable from another root (#3027 by @jhochenbaum) 4.1.8
• count mutually exclusive verdict edges as one incoming edge (#3024 by @jhochenbaum) 4.1.8
• fix tool call type serialization globally for any pydantic serialization (#2979 by @A-Vamshi) 4.1.5
• stamp utm_content first so GA4's 100-char link_url keeps the label (#2934 by @tonycueva) 4.1.3
• correct silent answer mis-scoring in MathQA, DROP, and BigBenchHard (#2916 by @hassaanch23) 4.1.3
• fix typo in tool name on metrics step efficiency doc (#2933 by @huisman) 4.1.3
• Add new DAG API e2e tests and fix docs (#2937 by @A-Vamshi) 4.1.3
• serialize tool call enums in JSON mode (#2926 by @nightcityblade) 4.1.3
• serialize ToolCall enums safely in save_as (#2928 by @Solaris-star) 4.1.2

Contributors to these changes: @A-Vamshi, @Anai-Guo, @biztex, @chiruu12, @hassaanch23, @huisman, @jhochenbaum, @jsaimanoj, @Koustav-github, @kritinv, @lorenzozanee, @nightcityblade, @Patwaji, @penguine-ip, @Solaris-star, @tanayvaswani, @tonycueva, @tunglambk, @ykocaogullar

A huge thank you to everyone who contributed to this release ❤️