HumanLayer
API and SDK for human approval of AI agent actionsPut a human in the loop on risky agent calls
Highlights
What you can do with it
- Approving high-risk AI agent function calls
- Getting human review of a critical decision
- Collecting labeled feedback data for tuning
How to use it
- 1 Register an account on the HumanLayer site
- 2 Choose a plan such as free, paid, or enterprise
- 3 Integrate the API and SDK into your agent
- 4 Configure approval workflows and escalation rules
- 5 Export feedback datasets for fine-tuning
Who it is for
Pros
- Free plan available for testing
- Broad framework and model compatibility
- Human oversight for risky agent actions
Limitations
- Adds a human step back into automation
- Integration and configuration take effort
- Enterprise pricing is custom and not published
What HumanLayer is
HumanLayer is an API and SDK that lets AI agents ask humans for feedback, input, and approval. Approval workflows run across channels such as Slack and email, so high-risk function calls get human oversight before they execute. It works with popular frameworks and models including LangChain, CrewAI, ControlFlow, OpenAI, Claude, and Llama 3.1. Other features include learning from past decisions to automate approvals, escalation and timeout handling across teams, and dataset export of feedback for fine-tuning. There is a free plan alongside paid and custom enterprise options, and the project is backed by Y Combinator.
What you can do with it
- Require human approval before an agent takes a risky action
- Route requests through Slack or email
- Learn from past decisions to automate routine approvals
- Export feedback as datasets for fine-tuning
Who it is for
- AI agent developers building autonomous systems
- Platform teams that need approval guardrails
- Enterprises automating sensitive workflows
What to watch out for
The whole point is putting a human back into the loop, so this adds latency and work rather than removing it, and it only makes sense where the risk justifies that cost. Integration and configuration take real effort before approvals flow smoothly. Enterprise pricing is custom rather than published, so budget conversations are needed for larger rollouts. Behavior may vary across browsers and devices, so test before production use and consult the help docs if errors appear. Features and interface details may change between versions, so review the latest notes on the page before you start. Free tiers and usage limits can change, so check the current rules on the official page before relying on it long term.
FAQ
What is HumanLayer?
It is an API and SDK that lets AI agents ask humans for feedback, input, and approval.
Is there a free plan?
Yes, there is a free plan alongside paid and custom enterprise options.
Which frameworks does it support?
It works with LangChain, CrewAI, ControlFlow, and models such as OpenAI, Claude, and Llama 3.1.
Who backs the project?
HumanLayer is backed by Y Combinator.
Why it is free
What the official page says： 免费
Free limits, trial length and features are decided by the official site and can change at any time.
Product preview
Screenshot archived from the listing page, for preview only.
