Read output from a terminal session with smart truncation options
AI agents call read_terminal to retrieve information from Persistent Terminal MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries existing terminal session output. It performs no mutations, code execution, or side effects—it merely reads and returns data. While the sibling tools include Execute-category operations (create_terminal, write_terminal, fix_bug_with_codex) and Destructive ones (kill_terminal), read_terminal itself is confined to data retrieval.
From the tool's definition Tool name 'read_terminal' and description 'Read output from a terminal session with smart truncation options' indicate a retrieval operation that accesses terminal output without modifying or executing anything.
Attacks that exploit this kind of access
Read output from a terminal session with smart truncation options. It is categorised as a Read tool in the Persistent Terminal MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Persistent Terminal MCP Server MCP server in PolicyLayer and add a rule for read_terminal: 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 Persistent Terminal MCP Server. Nothing to install.
read_terminal 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 read_terminal 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 read_terminal. 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.
read_terminal is provided by the Persistent Terminal MCP Server MCP server (masx200/persistent-terminal-mcp). 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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