AI agents call async_tool as a supporting operation in PullNexus workflows.
With no description and only a generic name, there is insufficient information to classify this tool into any meaningful risk category. The name 'async_tool' does not indicate read, write, execute, destructive, or financial operations. Confidence is very low and defaulting to Other with low severity is the safest classification given the lack of evidence.
From the tool's definition Tool name is 'async_tool' with an empty description providing no information about its function or effects.
Documented attack patterns abuse exactly the kind of access async_tool gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and PullNexus, and nothing reaches the server without passing your rules. This is the rule we recommend for async_tool:
{
"version": "1",
"default": "deny",
"tools": {
"async_tool": {
"limits": [
{
"counter": "async_tool_rate",
"window": "minute",
"max": 60,
"scope": "grant"
}
]
}
}
}async_tool gets a rate cap, and everything else on the server is denied unless you say otherwise.
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async_tool. It is categorised as a Other tool in the PullNexus MCP Server, which means it performs auxiliary operations.
Register the PullNexus MCP server in PolicyLayer and add a rule for async_tool: 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 PullNexus. Nothing to install.
async_tool is a Other tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the async_tool 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 async_tool. 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.
async_tool is provided by the PullNexus MCP server (mrwillist/pullnexus). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from PullNexus, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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11 PullNexus tools catalogued and risk-classified — across an index of 43,000+ MCP servers.