Skip to content

captcha.cc Human Verification

by captcha.cc · remote · no sign-in to list tools · v1.0.0 · published by cc.captcha

Human verification CAPTCHA with visual and selective-listening audio challenges.

Changes · 2
CompareRegistry entry

3 tools: 2 change things and 1 only read.

Scanned Oct 21, 2026

1 check matched something in the tool definitions. No finding is not a safety guarantee. How the checks work.

claude mcp add --transport http captchacc https://captcha.cc/mcp

Findings

Matches of fixed checks, with the text they matched.

1 warn
  • Warnmake_siteverify_request

    The server marks "make_siteverify_request" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

    Matched text

    annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "make_siteverify_request" says "request": a word for a change.

    What this check looks for

Tools

Open a tool for its reasons and full description. Descriptions are the publisher's own words, shown as they are.

3 tools

Changes things 2Claude Code: ask
  • create_challengeCreate a live captcha.cc challenge for a site key and allowed hostname.No findings

    Why it is in this group

    • The name "create_challenge" says "create": a word for a change.
    Description, as the server wrote it
    Create a live captcha.cc challenge for a site key and allowed hostname. Useful for smoke tests and integration checks.

    Annotations the server declares

    • readOnlyHint: false
    • destructiveHint: false
    • idempotentHint: false
    • openWorldHint: false
  • make_siteverify_requestReturn a server-side fetch example for redeeming a captcha.cc proof token exactly once.1 finding

    Why it is in this group

    • The name "make_siteverify_request" says "request": a word for a change.
    • The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.

    Findings

    • Warn

      The server marks "make_siteverify_request" read-only (readOnlyHint: true), and its own name, description or input give the class "write".

      Matched text

      annotations: {"readOnlyHint":true,"destructiveHint":false,"idempotentHint":true,"openWorldHint":false}; The name "make_siteverify_request" says "request": a word for a change.

      What this check looks for
    Description, as the server wrote it
    Return a server-side fetch example for redeeming a captcha.cc proof token exactly once.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false
Only reads 1Claude Code: allow
  • make_widget_snippetReturn a minimal browser SDK snippet for mounting captcha.cc and submitting the proof token to an application endpoint.No findings

    Why it is in this group

    • The description's first verb is "return": a word for reading.
    Description, as the server wrote it
    Return a minimal browser SDK snippet for mounting captcha.cc and submitting the proof token to an application endpoint.

    Annotations the server declares

    • readOnlyHint: true
    • destructiveHint: false
    • idempotentHint: true
    • openWorldHint: false

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Install

Pinned to version 1.0.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http captchacc https://captcha.cc/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json
{
  "permissions": {
    "allow": [
      "mcp__captchacc__make_widget_snippet"
    ],
    "ask": [
      "mcp__captchacc__make_siteverify_request",
      "mcp__captchacc__create_challenge"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. It assumes the server is installed as captchacc. Review it before you use it.