Send a key to the terminal.
Part of the Terminal server.
Free to start. No card required.
AI agents use terminal_send_key to create or modify resources in Terminal. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call terminal_send_key repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Terminal.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"terminal_send_key": {
"limits": [
{
"counter": "terminal_send_key_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Terminal policy for all 15 tools.
These attack patterns abuse exactly the kind of access terminal_send_key gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Send a key to the terminal.. It is categorised as a Write tool in the Terminal MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Terminal MCP server in PolicyLayer and add a rule for terminal_send_key: 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 Terminal. Nothing to install.
terminal_send_key is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the terminal_send_key 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 terminal_send_key. 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.
terminal_send_key is provided by the Terminal MCP server (pungggi/smart-terminal). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 15 Terminal tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.