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Agent frameworks

fast-agent

Both a usable agent and a framework for composing agent workflows, with broad MCP, ACP, A2A and multi-provider support.

3,918 stars

Overview

Research summary

fast-agent is both a usable CLI coding agent and a Python toolkit for defining, running, evaluating, and composing agents. Its terminal workflow can expose shell tools, load skills, connect MCP servers over local or remote transports, and switch among hosted or local model providers. Python decorators and configuration define agents and reusable workflows; built-in patterns include sequential chains, parallel fan-out and fan-in, evaluator-optimizer loops, LLM routers, orchestrators, iterative planners, voting-based MAKER workflows, and agents exposed as tools.

The framework can request human input and supports multimodal and structured outputs. ACP mode presents configured agents as client-selectable modes and carries streaming, cancellation, plans, progress notifications, sessions, client filesystem or terminal access, and client-supplied MCP servers into compatible editors. The same ecosystem also supports MCP deployment and Agent2Agent integration, making it broader than a single conversational coding loop.

Capability depends on the configured model, credentials, servers, and enabled execution tools; automation requires explicit model configuration. The implementation is public Python source under Apache-2.0.

Repository summary

Stars
3,918
Open issues
18
Last push
2026-09-13
Commits, 90 days
140
Repository activity
Very active · 98/100
Version
0.10.17

Recorded catalogue figures. View repository data and provenance →

Classification

Pricing & services

Paid services unknown

Whether the provider offers paid products or services has not been established.

Licence scope

Implementation

Recorded implementation details and interfaces for fast-agent.

Implementation details

Python

Languages
Python
Repository type
source
ACP identifier
fast-agent

Recorded interfaces and capabilities

Licence scope

Repository

Repository snapshots, release information and recorded maintenance signals.

Repository snapshot

evalstate/fast-agent ↗

Stars
3,918
Open issues
18
Last push
2026-09-13
Commits, 90 days
140
Repository activity
Very active · 98/100
Archived
No

Repository activity is a snapshot, not a quality or popularity ranking. It combines recent-push freshness (50%), 90-day commits (30%) and issue pressure (20%).

Release information

Current version
0.10.17
Version source
github-release
Version scope
evalstate/fast-agent
Version recorded
2026-09-14
Latest release tag
v0.10.17
Release published
2026-09-05
Default branch
main
Head commit
905eb6c3d4bded37e4eca34a8df26c823fdf7ca4

Maintenance and provenance

Catalogue snapshot
2026-10-06
Repository metrics recorded
2026-09-14
Stars source
GitHub snapshot
Last push source
GitHub snapshot
Repository metrics stale
No
Snapshot repository
evalstate/fast-agent

Documentation

Recorded references and research provenance for this entry.

Recorded sources 5

Research metadata

Catalogue snapshot
2026-10-06
Repository metrics recorded
2026-09-14

An individual research date has not been recorded for this entry.

Community & social 3 channels

Communities

Social & updates