Major Changes

• Sonnet 4.5 Support
• MCP Transport Diagnostics Command (/mcp)
• Show Agent History and Clear History Command (/history, /clear)
• Enhanced Display Handling
• Type clean-up

What's Changed

• README Update - Incorrect Example by @nicholasericksen in #402
• Feat/transport display/LLM Error Handling by @evalstate in #407
• stdio tracking, display tweak by @evalstate in #408
• icon and colour scheme fixes by @evalstate in #409
• improve notification handling, auto-cancel config, timeline display by @evalstate in #410
• [Mixed] Refactor + Fix + Example of McpAgent definition added by @ChrisW-priv in #411
• sonnet 45 model db update by @evalstate in #417
• feat: add an example of how to define a Tool Use agent that has direc… by @ChrisW-priv in #413
• Fix/deco types clean by @evalstate in #419
• feat: clear histories on the 'clear' special command by @ChrisW-priv in #414

New Contributors

• @nicholasericksen made their first contribution in #402

Full Changelog: v0.3.8...v0.3.12

What's Changed

• Support for XAI grok-4-fast! 2M Context Window VLM - model aliases:

grok-4-fast = grok-4-fast-non-reasoning
grok-4-fast-reasoning = grok-4-fast-reasoning

• Added A2A example (@usamaJ17)

• grok-4-fast support, a2a example, docstrings by @evalstate in #400

Full Changelog: v0.3.7...v0.3.8

Major Features

• mcp-ui support @idosal
• OAuth and Keyring Support added
• MCP Instructions support added
• Improvements to exported API layout
• Default serialization to PromptMessageExtended format
• Handle untokenizable content for models
• Code improvements thanks (@ChrisW-priv )

What's Changed

• Bedrock 0.3.0 refactor by @jdecker76 in #378
• Feat/check design by @evalstate in #380
• Feat/mcp UI by @evalstate in #382
• Fix/migration by @evalstate in #383
• Feat/save history command by @evalstate in #384
• Fix/exports by @evalstate in #385
• Fix/0.3.3 by @evalstate in #386
• FastAgent exported from fast_agent module by @evalstate in #387
• Feat/mcp UI output by @evalstate in #388
• Feat/oauth v1 by @evalstate in #389
• Fix/0.3.6 by @evalstate in #390
• chore: make a check for the length of the agent dict by @ChrisW-priv in #395
• Remove the boilerplate in the create_agents_in_dependency_order function by @ChrisW-priv in #396
• Fix/0.3.7 by @evalstate in #398

New Contributors

• @ChrisW-priv made their first contribution in #395

Full Changelog: v0.3.0...v0.3.7

fast-agent 0.3.0

• mcp-ui support
• api enhancements and improvements
• migration to fast_agent package. some compatibility layer remains.
• augmented_llm deprecated; improved architecture

Changes

• Feat/save history command @evalstate (#384)
• Fix/migration @evalstate (#383)
• Feat/mcp UI @evalstate (#382)
• Feat/check design @evalstate (#380)
• Bedrock 0.3.0 refactor @jdecker76 (#378)
• Dev 0.3.0 @evalstate (#366)

What's Changed

• fix: exclude mcp_metadata from llm args by @kaustubh-lgtm in #361
• feat: display default values for elicitation forms by @chughtapan in #367
• Improve elicitation input handling for multiline content by @chughtapan in #369
• Refactor Bedrock provider by @jdecker76 in #370

New Contributors

• @kaustubh-lgtm made their first contribution in #361

Full Changelog: v0.2.57...v0.2.58

Props to contributors. ❤️

NB This is intended to be the last 0.2.* release, with 0.3.0 coming soon. Command Line and High Level API remain the same, but there are some adjustments may be needed due to renaming and other internal improvements if using programmatically.

What's Changed

• Add support for sending MCP metadata by @jdecker76 in #340
• Add MCP SSE server reconnection by @jdecker76 in #342
• Support kwargs for MCPApp by @yogeshchandrasekharuni in #348
• Fix prompt crash when typing "/" and improve keyboard shortcuts by @ivy113 in #349
• Fix xml tag display in console by @ivy113 in #353

New Contributors

• @yogeshchandrasekharuni made their first contribution in #348

Full Changelog: v0.2.56...v0.2.57

Big thank you to all contributors :)

What's Changed

• Fix nested model's schema not converted to json object by @samchugit in #336
• Add support for AWS Bedrock OpenAI OSS models by @jdecker76 in #343
• Fix - Improve exit command visibility in interactive prompt by @ivy113 in #344
• Fix MCP filtering by @jdecker76 in #341

New Contributors

• @ivy113 made their first contribution in #344

Full Changelog: v0.2.55...v0.2.56

What's Changed

• Fix aliyun provider won't take empty tool array & json_schema by @samchugit in #331
• list_mcp_tools on agent interface by @evalstate in #334

New Contributors

• @samchugit made their first contribution in #331

Full Changelog: v0.2.52...v0.2.55

OpenAI GPT-5 Series Support

This release adds validated support for GPT-5 series (tested Text, Tools, Vision, PDF, Structured Outputs), entries to the model database, convenience aliases and support for the minimal reasoning mode.

Access with

fast-agent --model gpt-5  # gpt-5 with defaults
fast-agent --model gpt-5-mini.minimal # gpt-5-mini in minimal reasoning mode
fast-agent --model gpt-5-nano.high # gpt-5-nano in high reasoning mode.

TensorZero Updated Support and QuickStart

Read the updated documentation here: https://fast-agent.ai/models/llm_providers/#tensorzero-integration

• Migrate tensorzero implementation from native inference to OpenAI, and add quickstart by @aaronpolhamus in #308 -

gpt-oss support on Groq

Added support for groq.openai/gpt-oss-120b and groq.openai/gpt-oss-20b, tested with Tools and Structured Output. Aliases added for quick access : gpt-oss and gpt-oss-20b. so you can access with:

fast-agent --model gpt-oss

• Fix TypeError when Google Gemini returns None content.parts by @HarshLit in #328

New Contributors

• @HarshLit made their first contribution in #328

Full Changelog: v0.2.50...v0.2.51