# check

An MCP server that opens signed records of what an AI agent did on someone's behalf and which commercial influence applied.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI
- Author: getstub
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/getstub/recipes
- Updated: 2026-09-20
- HTML: https://affpapa.org/en/nevibecode/mcp/check

## What it does

\`check` is a public server from the Stub recipe set, an allegiance receipt registry for AI agents. Ask it for a signed record and you get back who requested the action, what was carried out, what money moved, and any commercial factor that shaped the outcome. The record is checked against a neutral registry rather than the operator's own servers.

It runs through `npx` as the `@getstub/mcp-check` package and plugs in as a stdio server across Claude, Codex, Cursor, GitHub Copilot and Gemini CLI. Cursor and Copilot take a config block with the command plus a `STUB_REGISTRY` variable. The recipes themselves come in JavaScript and Python and talk to the live registry; there is no offline mode, and issuing receipts requires an operator account.

The free tier covers 1,000 stubs a month. Verification stays free, since charging the person being served would defeat the purpose of a registry.

## Requirements
- Needs: Node.js (commands run via npx)
- Environment variables: `STUB_REGISTRY` — keys and tokens: ask the human for the values, never commit them or put them in shared files.

## Install

### Claude Code (native platform)

**Platform CLI**
```bash
claude mcp add --env STUB_REGISTRY=<STUB_REGISTRY> --transport stdio check -- npx -y @getstub/mcp-check
```
Replace <…> with your own values

### Codex

**Platform CLI**
```bash
codex mcp add check --env STUB_REGISTRY=<STUB_REGISTRY> -- npx -y @getstub/mcp-check
```
Replace <…> with your own values

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "check": {
            "command": "npx",
            "args": [
                "-y",
                "@getstub/mcp-check"
            ],
            "env": {
                "STUB_REGISTRY": "<STUB_REGISTRY>"
            }
        }
    }
}
```
Replace <…> with your own values

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "check": {
            "type": "stdio",
            "command": "npx",
            "args": [
                "-y",
                "@getstub/mcp-check"
            ],
            "env": {
                "STUB_REGISTRY": "<STUB_REGISTRY>"
            }
        }
    }
}
```
Replace <…> with your own values

### Gemini CLI

**Platform CLI**
```bash
gemini mcp add -e STUB_REGISTRY=<STUB_REGISTRY> check npx -y @getstub/mcp-check
```
Replace <…> with your own values

## When to use it
- confirm what an agent actually did for a user
- see whether a commission or paid placement shaped a result
- obtain a signed record anyone can open from a link
- wire registry verification into an agent loop
- sign an empty disclosure as proof nothing applied

## Example prompts
- Add the `check` MCP server so we can read Stub registry receipts.
- Use `check` to show which commercial factors influenced this pick.
- Pull the receipt for the agent's last action and link me to it.

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NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md