AI agents invoke outlook_open to trigger actions in WinScript. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
The description is empty, lowering confidence. Based on naming convention and server context (Windows automation, COM Office), this tool likely launches the Outlook application. Opening an application is an Execute-level action as it triggers an external operation. Severity is medium since opening Outlook itself has limited blast radius, but could be a precursor to further automation.
From the tool's definition Tool name 'outlook_open' on a Windows automation MCP server described as enabling 'app control, UI interaction, COM Office'. Sibling tools like 'chrome_open' and 'excel_open' suggest this opens the Outlook application.
Documented attack patterns abuse exactly the kind of access outlook_open gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and WinScript, and nothing reaches the server without passing your rules. This is the rule we recommend for outlook_open:
{
"version": "1",
"default": "deny",
"tools": {
"outlook_open": {
"limits": [
{
"counter": "outlook_open_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}outlook_open stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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outlook_open. It is categorised as a Execute tool in the WinScript MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the WinScript MCP server in PolicyLayer and add a rule for outlook_open: 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 WinScript. Nothing to install.
outlook_open is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the outlook_open 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 outlook_open. 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.
outlook_open is provided by the WinScript MCP server (ravaniroshan/winscript-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from WinScript, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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17 WinScript tools catalogued and risk-classified — across an index of 43,000+ MCP servers.