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fast-agent - Code, Build and Evaluate Agents

Coding Agent and Development Toolkit

fast-agent fast-agent

Simple extendable agents. Excellent provider and local model support. Flexible context management. Terminal native and scriptable.

Try it now Build an agent Explore the CLI
~/projects/fast-agent 
$ uvx fast-agent-mcp@latest -x
start an interactive session with shell tools

$uv tool install -U fast-agent-mcp
install the latest version of fast-agent

$ fast-agent --pack codex 
code download configuration to use codex

Test model behavior quickly

Switch between Anthropic, OpenAI, Responsesz, Google, Hugging Face, Groq, xAI, Bedrock, and local OpenAI-compatible endpoints. Built-in playback and passthrough models make app tests practical.

Model features

Use MCP without ceremony

Attach local or remote MCP servers from config or the command line. Use Elicitations, Sampling, Resources, Prompts, OAuth, UI resources, and transport diagnostics from one client.

MCP guide

Compose workflow patterns

Chain agents, run parallel checks, route work, orchestrate subtasks, evaluate outputs, or use MAKER to turn classifier examples into reliable structured decisions.

Workflow docs

Ship beyond the terminal

Run the same agent definitions interactively, expose them as MCP servers, or connect them to ACP clients with slash commands, file access, and permission-aware tools.

ACP docs