# io.github.GSterlingPress/once

> io.github.GSterlingPress/once — gsterlingpress-once-api. Use this tool when you need to prevent duplicate side effects in AI agents, such as refunds, emails, or orders, and ensure actions execute exactly once. It solves problems of idempotence and retries by using unique keys and durable receipts. Ideal for use cases requiring guaranteed once-only execution, such as financial transactions or critical notifications.

Canonical page: https://skillsregistry.net/skills/gsterlingpress-once-api  
JSON: https://api.skillsregistry.net/v1/skills/gsterlingpress-once-api

## Description

MCP server that prevents duplicate side effects in AI agents by using idempotency keys and durable receipts, ensuring actions like refunds, emails, or orders execute exactly once even across retries.

## Trust

- **Trust score (0–1):** 0.68
- **Verification tier:** scanned
- **Last scanned:** 2026-08-29

## Facts

- **Version:** 1.0.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** ai-ml
- **Updated:** 2026-08-29

## Source

- **Source listing:** [Glama](https://glama.ai/mcp/servers/cggi648gu3)
- **Repository:** <https://github.com/GSterlingPress/once-api>

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "gsterlingpress-once-api"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/gsterlingpress-once-api` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/gsterlingpress-once-api/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt