What's Changed

🚀 Features

• feat: add OpenAI Conversations API state support via OpenAIResponsesModelSettings.openai_conversation_id by @corytomlinson in #5224
• feat: typed OTel metadata for code tool call syntax highlighting by @DouweM in #5297

📦 Dependencies

• Upgrade web UI to pydantic/ai-chat-ui 1.2.0 by @johnthagen in #5246

New Contributors

• @johnthagen made their first contribution in #5246
• @Acacian made their first contribution in #4888
• @VeniVeci made their first contribution in #5283

Full Changelog: v1.89.1...v1.90.0

What's Changed

🤖 Coding Agent Experience

• Add bundled Library Skills(https://library-skills.io) for improved coding-agent support by @adtyavrdhn in #5271

🐛 Bug Fixes

• fix: restore wrap_validation_errors on ToolManager function-tool methods by @DouweM in #5275
• Defer anyio.Lock creation via cached_property to bind to running loop by @Kludex in #5265

New Contributors

• @dependabot[bot] made their first contribution in #5268

Full Changelog: v1.89.0...v1.89.1

What's Changed

🚀 Features

• feat: add conversation_id for cross-run correlation by @DouweM in #5251
• feat(capabilities): support dynamic capabilities via callables in capabilities list by @DouweM in #5252
• feat: add builtin_tools to agent.override by @mplemay in #5248

🐛 Bug Fixes

• fix(evals): use non-daemon thread for background evaluators by @alexmojaki in #5247

Full Changelog: v1.88.0...v1.89.0

What's Changed

🚀 Features

• feat(capabilities)!: output validate/process hooks; scope prepare_tools to function tools, add prepare_output_tools by @DouweM in #4859
• feat: cross-provider service_tier model setting; Anthropic + Gemini API + Vertex Priority PayGo support by @markmcd in #4926
• Add anthropic speed, fast mode for opus 4.6 by @bohdanhr in #4300
• feat: support OpenAI Responses phase on assistant messages by @DouweM in #5229
• feat(ui): add UIAdapter.sanitize_messages and allowed_file_url_schemes by @DouweM in #5228

🐛 Bug Fixes

• fix: restore per-block cache_control for anthropic_cache_messages by @Wh1isper in #5227
• fix: propagate original error when CallToolsNode stream fails by @thejens in #4799
• fix: propagate Agent(retries=...) to user-provided toolsets by @dsfaccini in #4745

New Contributors

• @markmcd made their first contribution in #4926

Full Changelog: v1.87.0...v1.88.0

What's Changed

🚀 Features

• Add HandleDeferredToolCalls capability and handle_deferred_tool_calls hook by @DouweM in #5142
• Add ProcessEventStream capability by @DouweM in #5141
• Handle thinking setting for GPT-5.5 by @dsfaccini in #5196

Full Changelog: v1.86.1...v1.87.0

What's Changed

🐛 Bug Fixes

• fix(openai): guard against choices=None in streamed chunks (#5165) by @adtyavrdhn in #5170
• fix(anthropic): send container_id as string on reuse; unwrap broken {id: x} shape by @adtyavrdhn in #5168
• fix: preserve validation error input on tool-call retries by @DouweM in #5181
• fix(toolsets): prevent MCPServer.__aexit__ called more times than __aenter__ in DynamicToolset by @anishesg in #5171
• Warn about dict fields with Anthropic strict mode by @rahulmansharamani14 in #4321
• Set gen_ai.operation.name=execute_tool on tool-execution spans by @DouweM in #5182
• fix: avoid stale client references in model and embedding classes by @Deeven-Seru in #4276

New Contributors

• @anishesg made their first contribution in #5171
• @rahulmansharamani14 made their first contribution in #4321
• @Deeven-Seru made their first contribution in #4276

Full Changelog: v1.86.0...v1.86.1

What's Changed

🚀 Features

• feat(ui): add UIAdapter.manage_system_prompt + ReinjectSystemPrompt capability by @dsfaccini in #4087

🐛 Bug Fixes

• fix(vercel-ai): allow regenerate requests without messageId by @MukundaKatta in #5156
• Handle dict reasoning_content from Gemini 2.5 models by @JulieLiu99 in #5155

New Contributors

• @MukundaKatta made their first contribution in #5156
• @JulieLiu99 made their first contribution in #5155

Full Changelog: v1.85.1...v1.86.0

What's Changed

🐛 Bug Fixes

• fix: exclude validation error input from retry messages by @navalprakhar in #4947
• fix(vercel-ai): auto-detect deferred tool approval state in dump_messages() by @tijmenhammer in #4831

New Contributors

• @abhicris made their first contribution in #5149
• @navalprakhar made their first contribution in #4947
• @tijmenhammer made their first contribution in #4831

Full Changelog: v1.85.0...v1.85.1

What's Changed

🚀 Features

• Online evaluation via OpenTelemetry events by @dmontagu in #5125

Full Changelog: v1.84.1...v1.85.0

What's Changed

🐛 Bug Fixes

• Skip tool hooks for internal output tools by @DouweM in #5128
• Always pass dict-shaped validated args to hooks for single-BaseModel tools by @DouweM in #5137

Full Changelog: v1.84.0...v1.84.1