polygraphso

AI agents plug into third-party tools and load skills that can hijack them or leak your data.

CommunityOnlineNo sign-inGlobalFreeCan modify data

What it can do

  • Check Server: Read a server's published behavioral grade (A–F) from polygraph.so in under a second — no execution. The pre-flight check before recommending or installing an MCP server. On a miss it re
  • List Servers: Every MCP server that carries a published polygraph grade, sorted A-first.
  • Request Grade: Add an ungraded MCP server to polygraph.so's public grading queue (free, best-effort). Read the result later with check_server. Only real, plausibly-MCP targets are accepted.

What data it sees

Do you need an account

No: the server works without sign-in

AI agents plug into third-party tools and load skills that can hijack them or leak your data. We run those tools through an adversarial test, scan those skills for the same tricks, and publish a letter grade — free to read, public, evidence attached.

How to connect

How to connect polygraphso to Claude

The server address to paste into Claude settings:

https://polygraphso--ruben-sousa-dinis.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect polygraphso to ChatGPT

The server address to paste into ChatGPT settings:

https://polygraphso--ruben-sousa-dinis.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect polygraphso to Cursor

The server address to paste into Cursor settings:

https://polygraphso--ruben-sousa-dinis.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (3)

Raw names from tools/list. Only developers need these.

check_serverRead a server's published behavioral grade (A–F) from polygraph.so in under a second — no execution. The pre-flight check before recommending or installing an MCP server. On a miss it returns not_available (unevaluated — neither safe nor unsafe) with next steps.
list_serversEvery MCP server that carries a published polygraph grade, sorted A-first.
request_gradeAdd an ungraded MCP server to polygraph.so's public grading queue (free, best-effort). Read the result later with check_server. Only real, plausibly-MCP targets are accepted.