AI agents invoke timer to trigger actions in Widget MCP. 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.
Starting a timer is an action that triggers an interactive widget and initiates a time-based operation. This falls under Execute as it runs/triggers an external interactive component. The blast radius is low since it only affects a UI widget with no data modification or system-level impact. Confidence is moderate due to the truncated description.
From the tool's definition Tool name 'timer' and partial description 'Start a timer. You don' — implies triggering/starting an interactive timer widget (an external operation)
Documented attack patterns abuse exactly the kind of access timer gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Widget MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for timer:
{
"version": "1",
"default": "deny",
"tools": {
"timer": {
"limits": [
{
"counter": "timer_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}timer 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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Start a timer. You don. It is categorised as a Execute tool in the Widget MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Widget MCP server in PolicyLayer and add a rule for timer: 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 Widget MCP. Nothing to install.
timer 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 timer 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 timer. 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.
timer is provided by the Widget MCP server (ref-tools/widget-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Widget MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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4 Widget MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.