Bug Fixes 🐛

• Fix: Prevent empty additional_args from being added to agent prompt by @jokokojote in https://github.com/huggingface/smolagents/pull/1566
• Fix SyntaxError in generated Gradio app due to 'class' attribute by @albertvillanova in https://github.com/huggingface/smolagents/pull/1615
• Fix serialization inconsistency in MultiStepAgent.to_dict/from_dict for managed_agents by @hazrmard in https://github.com/huggingface/smolagents/pull/1577
• Fix a kwargs error in LocalPythonExecutor by @aymeric-roucher in https://github.com/huggingface/smolagents/pull/1583
• Fix structured outputs by @MicrosoftJames in https://github.com/huggingface/smolagents/pull/1642
• Fix bug where AmazonBedrockServerModel crashes in thinking mode by @benoriol in https://github.com/huggingface/smolagents/pull/1632
• Fix: Remove duplicate line in tool_calling_agent prompt by @yusuf-eren in https://github.com/huggingface/smolagents/pull/1636
• Fix: RemotePythonExecutor should not send variables if none exist by @thomasjpfan in https://github.com/huggingface/smolagents/pull/1605
• Disable parallel tool calls for final answer by @aymeric-roucher in https://github.com/huggingface/smolagents/pull/1539

Documentation 📚

• Improve Installation docs with uv option by @albertvillanova in https://github.com/huggingface/smolagents/pull/1550
• Fix and improve MCP server security warnings in docs by @albertvillanova in https://github.com/huggingface/smolagents/pull/1549
• DOC: Fix image link for docs (secure_code_execution.md) by @FacerAin in https://github.com/huggingface/smolagents/pull/1582
• Update title of page "What are agents" by @aymeric-roucher in https://github.com/huggingface/smolagents/pull/1546
• Enable multilingual docs by @albertvillanova in https://github.com/huggingface/smolagents/pull/1633
• 🌐 [i18n-KO] Translated index.md to Korean by @FacerAin in https://github.com/huggingface/smolagents/pull/1581
• 🌐 [i18n-KO] Translated text_to_sql.md to Korean by @nsbg in https://github.com/huggingface/smolagents/pull/1603

CI / Dependency Updates 🧪

• Pin mcpadapt to support image/audio content by @albertvillanova in https://github.com/huggingface/smolagents/pull/1558
• Temporarily skip wrongly implemented tests by @albertvillanova in https://github.com/huggingface/smolagents/pull/1571
• CI hotfix: Pin mlx < 0.26.5 by @albertvillanova in https://github.com/huggingface/smolagents/pull/1586
• Support mlx-0.26.5 by @albertvillanova in https://github.com/huggingface/smolagents/pull/1589
• CI hotfix: Pin transformers < 4.54.0 by @albertvillanova in https://github.com/huggingface/smolagents/pull/1620
• Support transformers 4.54.0 by @albertvillanova in https://github.com/huggingface/smolagents/pull/1625
• Fix CI PytestUnknownMarkWarning: Unknown pytest.mark.timeout by @albertvillanova in https://github.com/huggingface/smolagents/pull/1630
• Fix CI quality: remove trailing whitespace by @albertvillanova in https://github.com/huggingface/smolagents/pull/1617

Deprecations & Cleanups 🧹

• Replace deprecated ast.Num and ast.Str with ast.Constant in tool validation by @WilliamRabuel in https://github.com/huggingface/smolagents/pull/1594
• Remove deprecated grammar parameter by @albertvillanova in https://github.com/huggingface/smolagents/pull/1651
• Remove deprecated token count attributes by @albertvillanova in https://github.com/huggingface/smolagents/pull/1652
• Remove deprecated agent logs attribute by @albertvillanova in https://github.com/huggingface/smolagents/pull/1653
• Remove mention of deprecated ManagedAgent from docs by @albertvillanova in https://github.com/huggingface/smolagents/pull/1655
• Remove deprecated default sse transport by @albertvillanova in https://github.com/huggingface/smolagents/pull/1656
• Replace duckduckgo_search with ddgs to address package rename warning by @WilliamRabuel in https://github.com/huggingface/smolagents/pull/1593
• Remove unused is_same_item function by @albertvillanova in https://github.com/huggingface/smolagents/pull/1631
• Remove unnecessary import by @rahul-1729 in https://github.com/huggingface/smolagents/pull/1639
• Simplify _is_package_available by @albertvillanova in https://github.com/huggingface/smolagents/pull/1641

Miscellaneous 🔧

• Add support for Amazon Bedrock API Keys by @colesmcintosh in https://github.com/huggingface/smolagents/pull/1612
• Factorize create_agent_gradio_app_template function by @albertvillanova in https://github.com/huggingface/smolagents/pull/1616
• Fix: Allow passing integers for floats by @aymeric-roucher in https://github.com/huggingface/smolagents/pull/1623
• Fix Tool.forward to raise NotImplementedError instead of returning by @HairlessVillager in https://github.com/huggingface/smolagents/pull/1628
• Make validate_tool_arguments raise instead of returning error string by @albertvillanova in https://github.com/huggingface/smolagents/pull/1634
• Remove mention of python in additional args by @aymeric-roucher in https://github.com/huggingface/smolagents/pull/1584
• ToolCallingAgent: remove unnecessary addition to model_output by @aymeric-roucher in https://github.com/huggingface/smolagents/pull/1622
• Minor fix in toolCallingAgentPrompt by @rahul-1729 in https://github.com/huggingface/smolagents/pull/1574

Maintenance 🏗️

• Bump dev version: v1.21.0.dev0 by @albertvillanova in https://github.com/huggingface/smolagents/pull/1544
• Remove empty issue template by @albertvillanova in https://github.com/huggingface/smolagents/pull/1562
• Improve issue templates by @albertvillanova in https://github.com/huggingface/smolagents/pull/1563
• Add issue template for documentation improvements by @albertvillanova in https://github.com/huggingface/smolagents/pull/1564
• Add uv option to CONTRIBUTING by @albertvillanova in https://github.com/huggingface/smolagents/pull/1561

New Contributors

• @jokokojote made their first contribution in https://github.com/huggingface/smolagents/pull/1566
• @rahul-1729 made their first contribution in https://github.com/huggingface/smolagents/pull/1574
• @WilliamRabuel made their first contribution in https://github.com/huggingface/smolagents/pull/1594
• @FacerAin made their first contribution in https://github.com/huggingface/smolagents/pull/1582
• @thomasjpfan made their first contribution in https://github.com/huggingface/smolagents/pull/1605
• @hazrmard made their first contribution in https://github.com/huggingface/smolagents/pull/1577
• @HairlessVillager made their first contribution in https://github.com/huggingface/smolagents/pull/1628
• @benoriol made their first contribution in https://github.com/huggingface/smolagents/pull/1632
• @yusuf-eren made their first contribution in https://github.com/huggingface/smolagents/pull/1636
• @nnfrog made their first contribution in https://github.com/huggingface/smolagents/pull/1551
• @nsbg made their first contribution in https://github.com/huggingface/smolagents/pull/1603
• @karenwky made their first contribution in https://github.com/huggingface/smolagents/pull/1320
• @MicrosoftJames made their first contribution in https://github.com/huggingface/smolagents/pull/1642
• @adaminsky made their first contribution in https://github.com/huggingface/smolagents/pull/1645

Full Changelog: https://github.com/huggingface/smolagents/compare/v1.20.0...v1.21.0