fast-agent
Framework to build, run and evaluate agents with strong MCP, ACP and A2A support.
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About fast-agent
fast-agent is listed in our frameworks category and is aimed at builders. Framework to build, run and evaluate agents with strong MCP, ACP and A2A support. Pricing, as the maker states it: Open source. Maturity: Active. We last checked the official link on 2026-10-16.
fast-agent alternatives
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Open Apache-2.0 runtime to build, run, and govern managed agents with choice of harness (Claude Agent SDK, Codex, Pi) and model; open-sourced Oct 6, 2026 (Developer Preview).
Ruflo
Open-source multi-agent meta-harness for Claude Code, Codex, and MCP clients; Oct 13 release adds Mods (mission workflows) and a single control plane with human approval.
Hermes Agent (Nous Research)
Open-source agent harness; v0.21.7 stable shipped Oct 12, v0.22.0 RCs Oct 13-14.
OpenAI Agents SDK (Python)
OpenAI's Python SDK for building multi-agent workflows; v0.23.0/0.23.1 released Oct 1-2.
LangChain Deep Agents
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LangGraph
Framework for stateful, graph-based agent workflows.
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