AI agents call poll_job to retrieve information from Ns Hpc without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries the status of an existing job and may wait for its completion, but performs no write, destructive, execution, or financial operations. The verb 'poll' indicates monitoring/retrieval activity. Even with optional waiting, no side effects occur beyond status observation.
From the tool's definition Tool description states 'Poll a running job' with optional wait for completion. Polling retrieves job status without modifying job state or triggering new operations.
Attacks that exploit this kind of access
Poll a running job. Optionally wait for completion. It is categorised as a Read tool in the Ns Hpc MCP Server, which means it retrieves data without modifying state.
Register the Ns Hpc MCP server in PolicyLayer and add a rule for poll_job: 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 Ns Hpc. Nothing to install.
poll_job 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 poll_job 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 poll_job. 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.
poll_job is provided by the Ns Hpc MCP server (li-yq/namespaced-hpc-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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