# SignCheck (npm · @agentgate-builder/signcheck)

Pre-sign safety check for agent wallets: tx, EIP-712, EIP-7702, x402. By Crypto Money Maker

- Trust score: 62/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-23

## Components

- remote · `api.youraitools.co`: 68/100, [markdown](https://verifymcp.io/servers/co-youraitools-signcheck/signcheck-mcp.md), [page](https://verifymcp.io/servers/co-youraitools-signcheck/signcheck-mcp)
- npm · `@agentgate-builder/signcheck`: 62/100 (this document), [markdown](https://verifymcp.io/servers/co-youraitools-signcheck/agentgate-builder-signcheck.md), [page](https://verifymcp.io/servers/co-youraitools-signcheck/agentgate-builder-signcheck)

## Channel facts

- Registry: `npm`
- Package: `@agentgate-builder/signcheck`
- Version: `0.2.0`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-23.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **Provenance & Transparency**: 19/100
  - Repository check failed: no source repository is declared.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 0 days ago).
  - Security-disclosure policy not yet verified: we couldn't inspect the source repository.
- **Schema Quality & AI Usability**: 54/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 421 tokens (~421/item across 1 items; 1 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 3/100
  - Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 1 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 2 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the SignCheck MCP server?

SignCheck runs locally as an npm package, launched with npx -y @agentgate-builder/signcheck. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add co-youraitools-signcheck -- npx -y @agentgate-builder/signcheck
```

### Cursor

```json
{
  "mcpServers": {
    "co-youraitools-signcheck": {
      "command": "npx",
      "args": [
        "-y",
        "@agentgate-builder/signcheck"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "co-youraitools-signcheck": {
      "command": "npx",
      "args": [
        "-y",
        "@agentgate-builder/signcheck"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add co-youraitools-signcheck -- npx -y @agentgate-builder/signcheck
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "co-youraitools-signcheck": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@agentgate-builder/signcheck"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add co-youraitools-signcheck --command npx --arg -y --arg @agentgate-builder/signcheck
```

### Hermes

```yaml
mcp_servers:
  co-youraitools-signcheck:
    command: "npx"
    args: ["-y", "@agentgate-builder/signcheck"]
```

### Netclaw

```json
{
  "McpServers": {
    "co-youraitools-signcheck": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@agentgate-builder/signcheck"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add co-youraitools-signcheck -t stdio -c npx -a -y @agentgate-builder/signcheck
```

### Other

```json
{
  "mcpServers": {
    "co-youraitools-signcheck": {
      "command": "npx",
      "args": [
        "-y",
        "@agentgate-builder/signcheck"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-22 (score 62)

First indexed and scored.

## MCP tools (1)

### `check_signature` (~367 tokens)

Is it safe to sign this?

Call BEFORE a wallet signs or sends anything. Decodes a transaction, EIP-712 request (Permit, Permit2, EIP-3009, Seaport), EIP-7702 delegation or x402 payment into plain English and returns SAFE / CAUTION / DANGER with risk flags (unlimited or EOA approvals, setApprovalForAll, fake USDC domains, x402 overpay / wrong payTo, OFAC SDN). Free offline preview by default (verdict, summary, flag codes). With SIGNCHECK_X402_PRIVATE_KEY set, returns the full paid check (reasons, on-chain facts, simulation) from https://api.youraitools.co/signcheck/v1/check, paying $0.015 USDC on Base per check over x402. Informational pre-sign check from public data and static rules, not a security guarantee or financial advice. A SAFE verdict means no known-bad pattern was found.

Input parameters:

- `authorization` (object): EIP-7702 authorization {address, chainId, nonce}
- `chain` (string): base (default), ethereum, base-sepolia or a chain id
- `payment_payload` (object|string): x402 payment about to be sent: PAYMENT-SIGNATURE / X-PAYMENT (base64) or JSON
- `payment_required` (object|string): x402 402 terms: PAYMENT-REQUIRED header (base64) or {accepts:[…]}
- `tx` (object): Transaction about to be sent: {"to":"0x…","data":"0x…","value":"0","from":"0x…"}
- `typed_data` (object): EIP-712 request {domain, types, primaryType, message} (eth_signTypedData_v4)

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/co-youraitools-signcheck/agentgate-builder-signcheck#diagnostics

## Score history

- 2026-10-23: 62
- 2026-10-22: 62

## Common questions

### What is the SignCheck MCP server?

SignCheck is an MCP server listed in the public MCP registry as co.youraitools/signcheck. Pre-sign safety check for agent wallets: tx, EIP-712, EIP-7702, x402. By Crypto Money Maker. This page covers its npm package (@agentgate-builder/signcheck).

### Is the SignCheck MCP server safe to use?

SignCheck scores 62 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 23 October 2026. It declares no install or post-install scripts. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the SignCheck MCP server expose?

SignCheck exposes 1 tool: check_signature. Their descriptions and schemas cost roughly 367 tokens of context every time the server is loaded.

### Is the SignCheck MCP server still maintained?

SignCheck is still listed as active in the MCP registry. We last reached this channel on 23 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the SignCheck MCP server under?

SignCheck declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/@agentgate-builder/signcheck
- Socket report: https://socket.dev/npm/package/@agentgate-builder/signcheck
- Website: https://youraitools.co/
- Changelog RSS feed: https://verifymcp.io/servers/co-youraitools-signcheck/agentgate-builder-signcheck.xml
- Changelog JSON feed: https://verifymcp.io/servers/co-youraitools-signcheck/agentgate-builder-signcheck.json
- HTML version of this page: https://verifymcp.io/servers/co-youraitools-signcheck/agentgate-builder-signcheck