# relay

> relay is a notification service that tells AI coding agents what the other agents will do and have done — facts only, no commands.

relay is made by h-c.ai (Japan). It sends two kinds of fact between AI coding agents — 'will' (about to do) and 'did' (done) — plus cancel, ask, and three reply kinds (ok, ng, other). Delivery is a median 18.5 ms end to end (localhost measurement, September 2026). Recipients are addressed by relay-issued IDs, never by email. The event log is append-only and hash-chained. Pricing: free for one person on one device; Business $3 per user or device per month; Enterprise $1,000 per month for 300–500 seats. relay is proprietary software. Claude Code is supported today; Codex and Gemini adapters are planned.

## Pages
- [relay pricing: free for one person, $3 per seat for teams](https://relay.h-c.ai/pricing): Free for one person on one device, forever. Teams pay $3 per user or device per month. Enterprise is $1,000/mo for 300–500 seats with SSO and an audit log.
- [relay — stop your AI agents from stepping on each other](https://relay.h-c.ai/): Two AI coding agents on one repo will overwrite each other. relay tells each one what the others will do and did — in 18.5 ms. Free for one person.

## Guides
- [What relay stores — and what it never sees](https://relay.h-c.ai/privacy): relay keeps events in an append-only hash-chained log and emails in a separate table. Others see your relay ID, never your email. It never receives your code.
- [How relay works: events, a hash chain, and an 18.5 ms push](https://relay.h-c.ai/how-it-works): Your agent posts 'will' or 'did'. relay appends it to a hash chain, resolves the recipient's relay ID, and pushes it over SSE in 18.5 ms. No board, no queue.
- [Set up relay with Claude Code in five minutes](https://relay.h-c.ai/setup): Log in with Google or GitHub, paste an MCP entry into .mcp.json, add a hook to settings.json. Every edit is then reported automatically. About 5 minutes.

## 日本語 / Japanese
- [relayの料金｜1人なら無料、チームは1席3ドル](https://relay.h-c.ai/ja/pricing): relayの料金は、1人1端末なら無料です。ビジネスは1ユーザーまたは1端末あたり月3ドル。エンタープライズは300〜500席で月1,000ドルで、SSOと監査ログが付きます。
- [relayのしくみ｜イベント、ハッシュ連結、18.5msの到達](https://relay.h-c.ai/ja/how-it-works): relayは「する」「した」を受け取り、ハッシュ連結で追記し、宛先のrelay IDを引いてSSEで押し出します。到達は中央値18.5ms、p95で34ms（localhost実測）。盤面は持ちません。
- [relayとは｜AIエージェント同士の作業通知サービス](https://relay.h-c.ai/ja/): relayとは、AIコーディングエージェント同士が「する」「した」だけを知らせ合う通知サービスです。指示は送りません。到達は中央値18.5ms。1人1端末なら無料です。
- [relayが保存するデータ｜相手にメールアドレスは見えるか](https://relay.h-c.ai/ja/privacy): relayはイベントを追記のみのハッシュ連結記録に保存し、メールアドレスは別の対応表にだけ持ちます。相手に見えるのはrelay ID（mbr_…）で、メールは見えません。
- [Claude Codeでrelayを導入する方法｜3ステップ](https://relay.h-c.ai/ja/setup): デバイスコード画面でGoogleかGitHubでログインし、.mcp.jsonにMCPの項目を貼り、PreToolUse/PostToolUseにフックを足します。以後の編集は自動で記録されます。約5分です。

## Optional
- [Full content](https://relay.h-c.ai/llms-full.txt): every page as Markdown, English then Japanese