ONCE — Exactly-Once Reliability for AI Agent Actions

What you can do with ONCE — Exactly-Once Reliability for AI Agent Actions

ONCE — Exactly-Once Reliability for AI Agent Actions is a Model Context Protocol (MCP) server published by GSterlingPress. It ranks #30,218 of 144,396 active servers on MCP Toplist. ONCE — Exactly-Once Reliability for AI Agent Actions is listed across 2 registries — Official MCP and Glama, with 4 tracked versions. It was first listed on Aug 10, 2026 and most recently updated on Sep 13, 2026.

What ONCE — Exactly-Once Reliability for AI Agent Actions can and cannot do

Not verifiedMCP Toplist has not catalogued this server's tools or limitations. The repository README lists them.

What you need before using ONCE — Exactly-Once Reliability for AI Agent Actions

Connect ONCE — Exactly-Once Reliability for AI Agent Actions and confirm it works

claude mcp add --transport http once https://optimistic-compassion-production.up.railway.app/mcp

[mcp_servers.once]
url = "https://optimistic-compassion-production.up.railway.app/mcp"

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

{
  "mcpServers": {
    "once": {
      "url": "https://optimistic-compassion-production.up.railway.app/mcp"
    }
  }
}

{
  "servers": {
    "once": {
      "type": "http",
      "url": "https://optimistic-compassion-production.up.railway.app/mcp"
    }
  }
}

{
  "mcpServers": {
    "once": {
      "serverUrl": "https://optimistic-compassion-production.up.railway.app/mcp"
    }
  }
}

{
  "mcpServers": {
    "once": {
      "url": "https://optimistic-compassion-production.up.railway.app/mcp"
    }
  }
}

When to choose another server

• PREFLIGHT — URL Routing for AI Agents#32,714
• FRESH — Shared URL Freshness Intelligence#33,619
• POSTFACT — Resolve Ambiguous Side Effects Before Retry#33,620
• RECOVER — Decide Safely After a Failed Machine Action#33,621
• MAILTYPE — Email Domain Capability Intelligence#62,290

No task-specific alternatives are catalogued for ONCE — Exactly-Once Reliability for AI Agent Actionsyet; the list above is its publisher's other servers.

What changed, and when this was checked

First listed

Aug 10, 2026

Latest version published

Sep 13, 2026

Version history

4 versions tracked (below)

Requirements evidence

MCP Toplist probed the public endpoint on Oct 14, 2026 and could not complete the MCP handshake (jsonrpc error). Requirements remain unverified.

Profile checked

Not yet — purpose, capabilities and requirements above come from registry data only

Ranking data as of

Oct 16, 2026

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Show your rank

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