A2H: ask a human
Ask a human before acting: approvals by email, Telegram or push, signed answers, passkeys.
- tools
- 5
- auth
- Secret needed
- transport
- STDIO
- env vars
- 4
- last updated
- Nov 9, 2026
Tools
5 toolsPublic tool metadata for what this MCP can expose to an agent.
request_approvalAsk you to approve or decline an action; returns the verified decision
Ask you to approve or decline an action; returns the verified decision
No parameter schema in public metadata yet.
ask_humanAsk you to fill in a short form (text, numbers, dates, choices, yes/no)
Ask you to fill in a short form (text, numbers, dates, choices, yes/no)
No parameter schema in public metadata yet.
notify_humanSend you a message (progress, result, alert)
Send you a message (progress, result, alert)
No parameter schema in public metadata yet.
check_requestFollow up on a request that is still waiting
Follow up on a request that is still waiting
No parameter schema in public metadata yet.
cancel_requestWithdraw a request that has not been answered
Withdraw a request that has not been answered
No parameter schema in public metadata yet.
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A2H_GATEWAY*URL of your A2H gateway, e.g. https://a2h.example.com
A2H_API_KEY*secretAPI key of the gateway
A2H_TO*Where to reach you: mailto:you@example.com, tg:<chat_id> or an ntfy topic URL
A2H_PRINCIPALYour principal ID on the gateway (optional)
Readme
a2h-gateway
A self-hosted gateway for A2H, the Agent-to-Human protocol: AI agents and scripts ask a person for approval or information, the person answers from email, Telegram or a push notification, and the agent gets a signed answer with proof of who decided. A single Go binary with SQLite.
$ a2h ask -to mailto:me@example.com -why "Rolls back if health checks fail." "Deploy v2.3 to production?"
Waiting for an answer from mailto:me@example.com (interaction 01a1bbcf-…)…
Approved (email_link.v1) at 2026-11-08T15:37:50Z.
$ echo $?
0
A2H was published by Twilio Labs in February 2026 with a specification, an OpenAPI schema and a proof-of-concept demo. Its roadmap lists a reference gateway and formal JSON Schemas as next steps. This project is an independent implementation of both, not affiliated with Twilio.
What it does
Details
- Repository
- github.com/andreaacanfora/a2h-gateway
- Website
- github.com/AndreaAcanfora/a2h-gateway#use-it-from-ai-agents-mcp
- Category
- Communication & Messaging
- Package
ghcr.io/andreaacanfora/a2h-gateway:0.3.0- Transport
- STDIO
- Auth
- Required
- Registry
- MCP registry, active
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