# Rat Radar (remote · rat-radar.github-a18.workers.dev)

Ask before you scrape: is a site open, may I fetch this URL, and how do I extract a page. No key.

- Trust score: 62/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `rat-radar.github-a18.workers.dev`: 62/100 (this document), [markdown](https://verifymcp.io/servers/tech-ratlabs-rat-radar/rat-radar.md), [page](https://verifymcp.io/servers/tech-ratlabs-rat-radar/rat-radar)

## Channel facts

- Endpoint: `https://rat-radar.github-a18.workers.dev/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.4.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, 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.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 8 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 1071 tokens (~133/item across 8 items; 8 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 96/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 87% 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 8 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**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Rat Radar MCP server?

Rat Radar is a hosted endpoint at https://rat-radar.github-a18.workers.dev/mcp, so there is nothing to install locally. 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 --transport http tech-ratlabs-rat-radar 'https://rat-radar.github-a18.workers.dev/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "tech-ratlabs-rat-radar": {
      "url": "https://rat-radar.github-a18.workers.dev/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "tech-ratlabs-rat-radar": {
      "type": "http",
      "url": "https://rat-radar.github-a18.workers.dev/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.tech-ratlabs-rat-radar]
url = "https://rat-radar.github-a18.workers.dev/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "tech-ratlabs-rat-radar": {
      "type": "remote",
      "url": "https://rat-radar.github-a18.workers.dev/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add tech-ratlabs-rat-radar --url 'https://rat-radar.github-a18.workers.dev/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  tech-ratlabs-rat-radar:
    url: "https://rat-radar.github-a18.workers.dev/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "tech-ratlabs-rat-radar": {
      "Transport": "http",
      "Url": "https://rat-radar.github-a18.workers.dev/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add tech-ratlabs-rat-radar -t streamable-http -u 'https://rat-radar.github-a18.workers.dev/mcp'
```

### Other

```json
{
  "mcpServers": {
    "tech-ratlabs-rat-radar": {
      "type": "http",
      "url": "https://rat-radar.github-a18.workers.dev/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## 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.

### 2026-11-04 (score 62, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 61, 0)

- [security] Tool “check_site” rewrote its description, which is the text the model reads

### 2026-11-01 (score 61, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-30 (score 60, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 59, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-28 (score 59)

First indexed and scored.

## MCP tools (8)

### `check_site` (~178 tokens)

Can I scrape this site, and how? Returns a verdict (open, guarded, hostile, blocked), a hostility score, a recommended approach with steps and risks, bot protections, robots.txt and AI-crawler policy, machine-readable surfaces (sitemap, llms.txt, JSON-LD), and eu_ai_training: the signals the EDPB draft Guidelines 03/2026 on web scraping for generative AI count against collecting personal data (robots.txt blocks on AI training crawlers, a Content-Signal of ai-train=no, ai.txt, CAPTCHAs, login walls), as none, some or strong. Signals, not legal advice. Uses a weekly-probed dataset of several hundred sites; for any other domain it probes live from a datacenter IP.

Input parameters:

- `domain` (string, required): A domain such as reddit.com

### `get_playbook` (~208 tokens)

What should I build with this site, and how? Give a domain and, optionally, a goal in plain words (for example "price alerts", "sales leads", "new jobs", "change log", "knowledge base"). Returns the best-matching workflow for that site: what it does, its cadence, a trigger, collect, shape, store, act pipeline, the fields to keep, and step-by-step build recipes for n8n, Make, Zapier and Apify (or just one with platform). Workflows marked found_on_this_site come from what the weekly probe saw on the site itself. Also returns the other workflows, the golden data, and the guardrails.

Input parameters:

- `domain` (string, required): A domain such as amazon.com
- `goal` (string): optional, what you want to achieve
- `platform` (string): optional, only return this platform (n8n also returns n8n_workflow, an importable file):'s recipe

### `list_sites` (~76 tokens)

List the sites in the dataset, optionally by category or verdict. Use it to find easy targets or to see what is covered.

Input parameters:

- `category` (string): e.g. shop, jobs, news, property, travel, gov
- `limit` (integer): default 50, max 200
- `verdict` (string)

### `xray_page` (~152 tokens)

How do I extract the data from THIS page? Fetches one public page and returns a ranked extraction plan: embedded JSON, JSON-LD, repeated records with CSS selectors and field names, tables, feeds, hidden API calls. Each source has a reliability, proof rows pulled from the real page, and the plan notes pagination and blockers. Set include_code for a starter Python script. Works on the raw HTML only, so JavaScript-built pages report a blocker instead of data. Use check_site first to learn whether the site allows scraping at all.

Input parameters:

- `include_code` (boolean): also return a starter Python script
- `url` (string, required): Full page URL, e.g. https://example.com/products

### `xray_diagram` (~146 tokens)

Draw a page's anatomy as an Excalidraw diagram: its regions, the ranked ways to get its data, proof rows, the best route and what the page is made of. Returns a download link for the .excalidraw file (give it to the user; it opens at excalidraw.com or in Obsidian) and a file_name. With include_scene, also the scene itself (a few hundred KB).

Input parameters:

- `include_scene` (boolean): also return the full Excalidraw scene JSON (large). Default false: just the download link
- `url` (string, required): Full page URL, e.g. https://example.com/products

### `search_sites` (~69 tokens)

Find sites in the dataset by a word: a name, host, category (jobs, shop, news, gov), country or verdict. Use it to discover what is covered before calling check_site.

Input parameters:

- `limit` (integer): default 25, max 100
- `query` (string, required)

### `can_fetch` (~111 tokens)

Does robots.txt allow fetching this exact URL? Fetches the live robots.txt and applies the longest-match rule for a user agent (default: * plus GPTBot, ClaudeBot, Google-Extended, CCBot, PerplexityBot). Returns allowed or not, the rule that decided it, and any crawl delay. A courtesy check, not a legal opinion.

Input parameters:

- `url` (string, required): The full URL you want to fetch
- `user_agent` (string): optional, e.g. GPTBot

### `summary` (~36 tokens)

Headline numbers across the dataset: verdict mix, how many sites block AI crawlers (and which), protection vendors, by category and country.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/tech-ratlabs-rat-radar/rat-radar#diagnostics

## Score history

- 2026-11-05: 62
- 2026-11-04: 62
- 2026-11-03: 61
- 2026-11-02: 61
- 2026-11-01: 61
- 2026-10-31: 60
- 2026-10-30: 60
- 2026-10-29: 59
- 2026-10-28: 59

## Common questions

### What is the Rat Radar MCP server?

Rat Radar is an MCP server listed in the public MCP registry as tech.ratlabs/rat-radar. Ask before you scrape: is a site open, may I fetch this URL, and how do I extract a page. No key. This page covers its hosted endpoint (https://rat-radar.github-a18.workers.dev/mcp).

### Is the Rat Radar MCP server safe to use?

Rat Radar scores 62 out of 100 on VerifyMCP. 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 Rat Radar MCP server expose?

Rat Radar exposes 8 tools: check_site, get_playbook, list_sites, xray_page, xray_diagram, and 3 more. Their descriptions and schemas cost roughly 976 tokens of context every time the server is loaded.

### Does the Rat Radar MCP server require authentication?

No. We connected to Rat Radar without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Rat Radar MCP server still maintained?

Rat Radar 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.

## Links

- Remote endpoint: https://rat-radar.github-a18.workers.dev/mcp
- Website: https://ratlabs.tech/radar/
- Changelog RSS feed: https://verifymcp.io/servers/tech-ratlabs-rat-radar/rat-radar.xml
- Changelog JSON feed: https://verifymcp.io/servers/tech-ratlabs-rat-radar/rat-radar.json
- HTML version of this page: https://verifymcp.io/servers/tech-ratlabs-rat-radar/rat-radar