Check port usage and find available ports
AI agents call env_port_manager to retrieve information from Claude MCP Server Integration without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves information about network port status and availability. It performs no writes, deletions, code execution, or financial operations. The capability to inspect port usage is a read-only diagnostic function with minimal security impact even if misused by an agent.
From the tool's definition Tool description states it 'check[s] port usage and find[s] available ports' — purely informational operations that query system state without modification or side effects.
Attacks that exploit this kind of access
Check port usage and find available ports. It is categorised as a Read tool in the Claude MCP Server Integration MCP Server, which means it retrieves data without modifying state.
Register the Claude MCP Server Integration MCP server in PolicyLayer and add a rule for env_port_manager: 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 Claude MCP Server Integration. Nothing to install.
env_port_manager is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the env_port_manager 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.
Set action: deny in the PolicyLayer policy for env_port_manager. 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.
env_port_manager is provided by the Claude MCP Server Integration MCP server (mokemoke0821/claude-mcp-integration). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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