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Certificate Transparency search for AI agents: certs, subdomains, issuance history, expiry.
About
Certificate Transparency search for AI agents: certs, subdomains, issuance history, expiry.
Security Report
5.2
Moderate5.2Moderate RiskA well-architected MCP server with strong input validation, proper credential handling, and appropriate scope. The codebase is clean, dependencies are minimal and safe, and authentication is properly enforced. Minor code quality observations do not materially impact security posture. Supply chain analysis found 3 known vulnerabilities in dependencies (0 critical, 3 high severity). Package verification found 1 issue.
7 files analyzed · 7 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
CertIndex API key (free tier at https://ctindex.io)Required
Environment variable: CERTINDEX_API_KEY
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-certindex-certindex-mcp": {
"env": {
"CERTINDEX_API_KEY": "your-certindex-api-key-here"
},
"args": [
"certindex-mcp"
],
"command": "uvx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
certindex-mcp
An MCP (Model Context Protocol) server that exposes CertIndex's Certificate Transparency search tools to any MCP-compatible client (Claude Desktop, the MCP Inspector, Continue, etc.).
CertIndex indexes the full public CT corpus (~5 M certificates, growing ~100 k/day). This server wraps the public CertIndex REST API so an LLM can ask questions like:
- "List every TLS certificate ever issued for
example.com." - "What subdomains has Let's Encrypt seen for
mycompany.io?" - "Show me certs expiring in the next 30 days for
api.mycompany.io." - "Pull the full PEM and CT log metadata for SHA-256
<fingerprint>."
Why this repo exists
The CertIndex monorepo bundles an MCP server (mounted at
https://api.ctindex.io/mcp) that talks directly to the production
Postgres index. This standalone package is a thin client-side
shim: it speaks MCP to your editor / agent and forwards every tool
call to the hosted CertIndex REST API over HTTPS. Two consequences:
- You don't need a copy of the index — sign up for a free API key at https://ctindex.io and you're done.
- The package has a tiny dependency footprint (
mcp,httpx,pydantic) — easy to audit, easy to vendor, no DB drivers.
Install
pip install certindex-mcp
Or with uvx for one-shot use:
uvx certindex-mcp
To install the latest development version from source instead:
pip install git+https://github.com/certindex/certindex-mcp
Quickstart — Claude Desktop
Add to ~/Library/Application Support/Claude/claude_desktop_config.json
(macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows):
{
"mcpServers": {
"certindex": {
"command": "uvx",
"args": ["certindex-mcp"],
"env": {
"CERTINDEX_API_KEY": "ctx_live_..."
}
}
}
}
Restart Claude Desktop. The six CertIndex tools (search_certificates,
get_certificate, get_domain_certificates, get_subdomains,
get_latest_cert, get_expiring_certs) appear in the tool tray.
Quickstart — MCP Inspector
export CERTINDEX_API_KEY=ctx_live_...
npx @modelcontextprotocol/inspector uvx certindex-mcp
Configuration
| Env var | Default | Description |
|---|---|---|
CERTINDEX_API_KEY | (required) | Your CertIndex API key. Mint one at https://ctindex.io/app/keys |
CERTINDEX_BASE_URL | https://api.ctindex.io | Override for self-hosted deployments / staging |
CERTINDEX_TIMEOUT | 30 | Per-request HTTP timeout (seconds) |
Security
Input validation, rate-limit handling, and our supply-chain posture are documented in SECURITY.md. Please report vulnerabilities to security@ctindex.io rather than filing public issues.
Development
git clone https://github.com/certindex/certindex-mcp
cd certindex-mcp
pip install -e ".[dev]"
pytest
CI runs on Python 3.11 / 3.12 / 3.13.
License
MIT © CertIndex contributors.
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