ONCE — Exactly-Once Reliability for AI Agent Actions for Claude.ai

io.github.gsterlingpress/once

Prevent duplicate AI-agent side effects with idempotency, verification, and durable receipts.

client:Claude.ai transport:streamable-http

Install ONCE — Exactly-Once Reliability for AI Agent Actions in Claude.ai

Settings → Connectors → Add custom connector

https://optimistic-compassion-production.up.railway.app/mcp

Claude on the web takes a remote URL and completes OAuth in the browser. For a packaged server use Claude Desktop or Claude Code instead. Claude.ai docs

ONCE — Exactly-Once Reliability for AI Agent Actions in other clients

Claude Code
Claude Desktop
Cursor
VS Code
Zed
Windsurf
Cline
Gemini CLI
Grok
ChatGPT
LangChain

ONCE — Exactly-Once Reliability for AI Agent Actions MCP server