EyalSec MCP server

Ask your AI assistant about your EyalSec account in plain words: "what critical events came in since Monday?", "show me the full trace for event 90210", "which machines need an update?". This server gives Claude, Cursor and any other MCP client read access to your events, machines, runs and rules through the EyalSec API, so the assistant you already use for code review can also help you triage what EyalSec found.

EyalSec follows untrusted data (requests, files, environment variables and more) through your running program and reports when it reaches a risky operation: a SQL query, a shell command, deserialization, a file path. Each event names the operation, the line of code, the value it received and where the untrusted part came from. This server reads those events; it never changes anything on your account.

What you need

• An EyalSec account and an API key. Create the key on your dashboard under Settings > API access. A read-only key is all this server needs, and it is the one we recommend: see API keys.
• Python 3.10 or newer, or uv, which runs the server without a separate install.

No account yet? Book a live demo and we will set one up with you. Pricing is at eyalsec.com/pricing.

Set it up

The server speaks MCP over stdio. Your client starts it with uvx eyalsec-mcp (or eyalsec-mcp after pipx install eyalsec-mcp) and passes the key in the environment.

Claude Code

claude mcp add eyalsec -e EYALSEC_API_KEY=es2_your_read_only_key -- uvx eyalsec-mcp

Claude Desktop

Add this to claude_desktop_config.json (Settings > Developer > Edit Config), then restart Claude Desktop:

{
  "mcpServers": {
    "eyalsec": {
      "command": "uvx",
      "args": ["eyalsec-mcp"],
      "env": {
        "EYALSEC_API_KEY": "es2_your_read_only_key"
      }
    }
  }
}

Cursor

Add the same block to ~/.cursor/mcp.json (every project) or .cursor/mcp.json (one project):

{
  "mcpServers": {
    "eyalsec": {
      "command": "uvx",
      "args": ["eyalsec-mcp"],
      "env": {
        "EYALSEC_API_KEY": "es2_your_read_only_key"
      }
    }
  }
}

Any other MCP client

Run uvx eyalsec-mcp as a stdio server with EYALSEC_API_KEY set. To check the key before wiring it into a client:

EYALSEC_API_KEY=es2_your_read_only_key uvx eyalsec-mcp --check

It calls the API once and prints the account it reached, the key's scope and the number of machines.

Settings

What it can do

Every tool is a read. The server has no code path that adds, changes or deletes anything, so even a full-access key cannot be used to write through it.

Some things to try:

• "Summarize this week's critical and high events by machine."
• "Open the newest SQL injection event and explain the path from the request to the query."
• "Which runs of app.py produced command-injection events yesterday?"
• "Do any machines have an update waiting or an install stuck in pending?"

Safety notes

• Events contain untrusted text. A value that reached a sink, a stack trace or a command line came from a monitored program and its inputs, which can include text an attacker wrote. The server tells the assistant to treat it as data, not instructions; keep human review on anything the assistant proposes to do with it.
• Use a read-only key. It can read everything this server reads and nothing more. A key can also carry an expiry date.
• The key stays with you. It is read from the environment, sent only to your EyalSec address over HTTPS, and never returned by any tool. Plain HTTP is refused except to localhost.
• The API's rate limits apply. search_events reads at most 10 pages per call and hands back a cursor for the rest.

Development

git clone https://github.com/EyalSec/eyalsec-mcp && cd eyalsec-mcp
python -m venv .venv && . .venv/bin/activate
pip install -e '.[test]'
pytest

The tests run against a fake API. To also run one read-only pass against your own account, set EYALSEC_LIVE=1 and EYALSEC_API_KEY.

Help

Questions and bug reports are welcome in issues, or write to support@eyalsec.com. Please send security reports to security@eyalsec.com rather than a public issue.

License

MIT. See LICENSE. The license covers this MCP server; your EyalSec account is governed by the EyalSec terms.