Relay MCP server

Relay

Plain-English client updates from every GitHub push

Live at relay-vishnu.fly.dev. Install the GitHub App, then add https://relay-vishnu.fly.dev/mcp to your MCP client, find Relay in the MCP Registry, or install the extension from the VS Code Marketplace or Open VSX.

Relay is a GitHub App for freelancers and agencies. Install it on your repositories, map each one to a client, and every push to the main branch becomes a short, jargon-free email summary written by Claude. Clients confirm by email before anything is sent, and every digest has a one-click unsubscribe.

How it works

sequenceDiagram
    participant Dev
    participant GitHub
    participant Web as Relay web
    participant Queue as Postgres (pg-boss)
    participant Worker as Relay worker
    participant Claude
    participant Resend
    participant Client

    Dev->>GitHub: git push
    GitHub->>Web: POST /webhook/github (HMAC-signed, installation id)
    Web->>Web: verify signature, claim X-GitHub-Delivery
    alt duplicate, filtered, or client not confirmed
        Web-->>GitHub: 200 duplicate / filtered
    else new push for an active mapping
        Web->>Queue: enqueue process-push
        Web-->>GitHub: 202 accepted
        Queue->>Worker: job
        Worker->>Claude: summarize commits (structured output), unless over the monthly cap
        Claude-->>Worker: validated summary
        Worker->>Resend: digest email + List-Unsubscribe
        Resend-->>Client: digest
    end

• GitHub App: one install connects any number of repositories, and no personal access tokens are needed (ADR 002).
• Multi-tenant: every row belongs to an installation, users are authorized by the installations GitHub says they can access, and uninstalling deletes that tenant's data.
• Postgres + pg-boss: the webhook replies 202 immediately, and a separate worker sends digests with retries and backoff (ADR 003).
• Consent built in: double opt-in confirmation, signed one-click unsubscribe (RFC 8058), and confirm/unsubscribe pages that only change state on POST.
• Cost controls: per-installation monthly cap on Claude-written digests (plain digests past it), token usage tracking, and a CLAUDE_ENABLED kill switch.
• Spec-first: OpenAPI 3.1 and JSON Schema contracts enforced at runtime and in CI.
• Remote MCP server with OAuth 2.1: add one URL to Claude Code, Claude Desktop, VS Code or Cursor, sign in with GitHub, and manage Relay by chatting (docs/mcp.md, ADR 004, ADR 005).
• Dashboard: a small server-rendered UI at /dashboard for people who don't use MCP.
• Richer summaries (opt-in): merged PR descriptions from GitHub, and issue details from the tenant's ticket tracker through Anthropic's MCP connector, with read-only tool allowlists and fallbacks (docs/summaries.md).

Running locally

Prerequisites: Node.js 22.12+, Docker (for Postgres), a GitHub App, an Anthropic API key and a Resend API key.

Shortened. The full README is on GitHub.