# PrufGate (pypi · prufgate)

Read-only tools that check whether code, and the tests that claim it works, are real.

- Trust score: 79/100 (medium)
- Change this week: +15
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- pypi · `prufgate`: 79/100 (this document), [markdown](https://verifymcp.io/servers/guardianvigil-labs-prufgate/prufgate.md), [page](https://verifymcp.io/servers/guardianvigil-labs-prufgate/prufgate)

## Channel facts

- Registry: `pypi`
- Package: `prufgate`
- Version: `1.1.0`
- 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 2026-11-05.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - Runs setuptools.build_meta at install time, a recognised build step with no custom scripting around it.
  - 0 of 1 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 100/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to GuardianVigil-Labs/Prufgate).
  - Clear OSI-approved license (Apache-2.0).
  - Actively maintained (last published 3 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 71/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 675 tokens (~75/item across 9 items; 9 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **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 9 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

**Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

## Install

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

PrufGate runs locally as a PyPI package, launched with uvx prufgate. 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 guardianvigil-labs-prufgate -- uvx prufgate
```

### Cursor

```json
{
  "mcpServers": {
    "guardianvigil-labs-prufgate": {
      "command": "uvx",
      "args": [
        "prufgate"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "guardianvigil-labs-prufgate": {
      "command": "uvx",
      "args": [
        "prufgate"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add guardianvigil-labs-prufgate -- uvx prufgate
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "guardianvigil-labs-prufgate": {
      "type": "local",
      "command": [
        "uvx",
        "prufgate"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add guardianvigil-labs-prufgate --command uvx --arg prufgate
```

### Hermes

```yaml
mcp_servers:
  guardianvigil-labs-prufgate:
    command: "uvx"
    args: ["prufgate"]
```

### Netclaw

```json
{
  "McpServers": {
    "guardianvigil-labs-prufgate": {
      "Transport": "stdio",
      "Command": "uvx",
      "Arguments": [
        "prufgate"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add guardianvigil-labs-prufgate -t stdio -c uvx -a prufgate
```

### Other

```json
{
  "mcpServers": {
    "guardianvigil-labs-prufgate": {
      "command": "uvx",
      "args": [
        "prufgate"
      ]
    }
  }
}
```

## 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.

### 2026-11-05 (score 79, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-11-04 (score 64, −15)

- [security regression] Malware scan: pass → unverified

### 2026-11-02 (score 79, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-10-28 (score 64, −15)

- [security regression] Malware scan: pass → unverified

### 2026-10-27 (score 79, +15)

- [security improvement] Malware scan: unverified → pass

### 2026-10-26 (score 64)

First indexed and scored.

## MCP tools (9)

### `prufgate_fast_scan` (~74 tokens)

Run engines 1-5 (anti-fabrication, test integrity, diff guard, contract guard, static BOLA) on changed files.

Input parameters:

- `base_ref` (string): Base git ref to diff against, e.g. origin/main
- `workspace_path` (string): Path to the repository to scan

### `prufgate_full_scan` (~102 tokens)

Run engines 1-5 on the whole workspace plus the diff reviewer; adds the live BOLA probe only when target_url is set.

Input parameters:

- `base_ref` (string): Base git ref to diff against, e.g. origin/main
- `target_url` (string): Live http(s) URL for the two-token BOLA probe. The probe runs only when this is set.
- `workspace_path` (string): Path to the repository to scan

### `prufgate_anti_fabrication` (~80 tokens)

Engine 1: canned fallbacks, simulated return values, stub handlers and other fabricated production logic.

Input parameters:

- `base_ref` (string): Base git ref to diff against, e.g. origin/main
- `changed_only` (boolean): Scan only changed files
- `workspace_path` (string): Path to the repository to scan

### `prufgate_test_audit` (~79 tokens)

Engine 2: zero-assertion tests, tautologies, self-mocked units and weakened assertions.

Input parameters:

- `base_ref` (string): Base git ref to diff against, e.g. origin/main
- `changed_only` (boolean): Scan only changed files
- `workspace_path` (string): Path to the repository to scan

### `prufgate_diff_guard` (~68 tokens)

Engine 3: skipped tests, suppression comments, unsafe casts and weakened lint/CI config added in the diff.

Input parameters:

- `base_ref` (string): Base git ref to diff against, e.g. origin/main
- `workspace_path` (string): Path to the repository to scan

### `prufgate_contract_check` (~78 tokens)

Engine 4: undeclared or hallucinated imports, undocumented environment variables and frontend/backend route mismatches.

Input parameters:

- `base_ref` (string): Base git ref to diff against, e.g. origin/main
- `changed_only` (boolean): Scan only changed files
- `workspace_path` (string): Path to the repository to scan

### `prufgate_bola_check` (~82 tokens)

Engine 5: routes and queries without auth or tenant scoping; the live two-token probe runs only when target_url is set.

Input parameters:

- `target_url` (string): Live http(s) URL for the two-token BOLA probe. The probe runs only when this is set.
- `workspace_path` (string): Path to the repository to scan

### `prufgate_review` (~68 tokens)

Engine 6: deterministic review of the diff against base_ref (default: resolved like prufgate check --changed).

Input parameters:

- `base_ref` (string): Base git ref to diff against, e.g. origin/main
- `workspace_path` (string): Path to the repository to scan

### `prufgate_summary` (~44 tokens)

Read the last SARIF/Markdown report written by ./prufgate.sh without running a scan.

Input parameters:

- `workspace_path` (string): Path to the repository to scan

## Diagnostics

Captured diagnostic sections: Provenance, Install scripts, Dependencies. The full working is on the page: https://verifymcp.io/servers/guardianvigil-labs-prufgate/prufgate#diagnostics

## Score history

- 2026-11-05: 79
- 2026-11-04: 64
- 2026-11-03: 79
- 2026-11-02: 79
- 2026-11-01: 64
- 2026-10-31: 64
- 2026-10-30: 64
- 2026-10-29: 64
- 2026-10-28: 64
- 2026-10-27: 79
- 2026-10-26: 64

## Common questions

### What is the PrufGate MCP server?

PrufGate is an MCP server listed in the public MCP registry as io.github.GuardianVigil-Labs/prufgate. Read-only tools that check whether code, and the tests that claim it works, are real. This page covers its PyPI package (prufgate).

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

PrufGate scores 79 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. Its build provenance is signed and verified. 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 PrufGate MCP server expose?

PrufGate exposes 9 tools: prufgate_fast_scan, prufgate_full_scan, prufgate_anti_fabrication, prufgate_test_audit, prufgate_diff_guard, and 4 more. Their descriptions and schemas cost roughly 675 tokens of context every time the server is loaded.

### Is the PrufGate MCP server still maintained?

PrufGate is still listed as active in the MCP registry. We last reached this channel on 5 November 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 PrufGate MCP server under?

PrufGate declares the Apache-2.0 licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- PyPI project: https://pypi.org/project/prufgate/
- Socket report: https://socket.dev/pypi/package/prufgate
- Repository: https://github.com/GuardianVigil-Labs/Prufgate
- Changelog RSS feed: https://verifymcp.io/servers/guardianvigil-labs-prufgate/prufgate.xml
- Changelog JSON feed: https://verifymcp.io/servers/guardianvigil-labs-prufgate/prufgate.json
- HTML version of this page: https://verifymcp.io/servers/guardianvigil-labs-prufgate/prufgate