Reef
Infrastructure for continually self-improving agents.
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About Reef
Reef is listed in our agent infra category and is aimed at builders. Infrastructure for continually self-improving agents. Pricing, as the maker states it: Open source. Maturity: Mature. We last checked the official link on 2026-10-16.
What is Reef?
Reef is open-source infrastructure for continually self-improving agents. It connects agent inference, feedback, learning and versioned delivery.
You can use it to train model weights with Slime and SGLang, or to improve an agent's harness, including its prompts, rules and skills.
Sources: the official README and our directory listing, checked 2026-10-18. Official site: reefinfra.ai.
Who is Reef for?
ML teams who want agents that keep improving from feedback in production.
Reef at a glance
- Open source: Yes (Apache License 2.0)
- GitHub: Human-Agent-Society/reef · 7,716 stars (as of Oct 21, 2026)
Key features
- Connects inference, feedback and learning
- Weight training via Slime and SGLang
- Harness improvement: prompts, rules, skills
- Versioned delivery
Reef FAQ
What is Reef?
Reef is open-source infrastructure for continually self-improving agents. It connects agent inference, feedback, learning and versioned delivery.
Who is Reef for?
ML teams who want agents that keep improving from feedback in production.
Is Reef free?
Reef's pricing, as the maker states it: Open source. Open-source tools are free to use, though you may still pay for model API usage or a hosted plan. Check the official site for current plans.
Is Reef open source?
Yes. Reef is released under the Apache License 2.0, according to its GitHub repository.
What are alternatives to Reef?
Similar tools include Liveblocks, Google Workspace CLI, Mirage, Nasiko, ACI.dev and Ref.
Reef ratings and reviews
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Reef alternatives
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Mirage
Virtual terminal environment for AI agents.
Nasiko
Open runtime for deploying and operating AI agents.
ACI.dev
Open-source tool-calling platform connecting hundreds of tools to agents.
Ref
Token-efficient documentation search for coding agents.
Related lists
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