domain.ct-logs · MCP: Risk & Policy

WHAT IT DOES

What domain.ct-logs does on Mcp

AI agents call domain.ct-logs to retrieve information from Mcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

WHY IT NEEDS A POLICY

Why domain.ct-logs needs a policy

This is purely reconnaissance data retrieval from public, immutable logs. It reads historical certificate issuance records to map DNS attack surface. There is no data modification, deletion, code execution, or financial transaction. The tool has no side effects beyond returning informational query results.

From the tool's definition Tool performs passive querying of public Certificate Transparency logs: 'discover its subdomains and issued certificates from public CT logs (passive attack-surface mapping)'.

Attacks that exploit this kind of access

Questions about domain.ct-logs

What does the domain.ct-logs tool do? +

Certificate Transparency recon for a domain — discover its subdomains and issued certificates from public CT logs (passive attack-surface mapping). Pass domain (+ optional limit). Returns deduplicated subdomains + certs (issuer, validity, SAN names), newest first. certSpotter primary, crt.sh fallback, keyless. CT shows names that ever appeared in a cert, not necessarily live hosts. It is categorised as a Read tool in the Mcp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on domain.ct-logs? +

Register the MCP server in PolicyLayer and add a rule for domain.ct-logs: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Mcp. Nothing to install.

What risk level is domain.ct-logs? +

domain.ct-logs is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit domain.ct-logs? +

Yes. Add a rate_limit block to the domain.ct-logs rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block domain.ct-logs completely? +

Set action: deny in the PolicyLayer policy for domain.ct-logs. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides domain.ct-logs? +

domain.ct-logs is provided by the MCP server (@2sio/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.