apply_leave · HR Assistant Agent MCP: Risk & Policy

WHAT IT DOES

What apply_leave does on HR Assistant Agent

AI agents use apply_leave to create or update resources in HR Assistant Agent — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your HR Assistant Agent environment.

WHY IT NEEDS A POLICY

Why apply_leave needs a policy

The tool creates or modifies employee leave records, making it a Write operation. Severity is medium because misuse could disrupt HR workflows and employee schedules, but the effects are reversible—leave applications can be withdrawn or corrected.

From the tool's definition Tool name is 'apply_leave' and description states 'Apply for leave for an employee.' This creates or modifies leave records by recording a new leave application, which is a reversible action (leave applications can be cancelled or modified).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

apply_leave Rate-limited

apply_leave stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "apply_leave": {
      "limits": [
        {
          "counter": "apply_leave_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches HR Assistant Agent, so you can run agents against it safely.

FAQ

Questions about apply_leave

What does the apply_leave tool do? +

Apply for leave for an employee. It is categorised as a Write tool in the HR Assistant Agent MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on apply_leave? +

Register the HR Assistant Agent MCP server in PolicyLayer and add a rule for apply_leave: 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 HR Assistant Agent. Nothing to install.

What risk level is apply_leave? +

apply_leave is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit apply_leave? +

Yes. Add a rate_limit block to the apply_leave 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.

How do I block apply_leave completely? +

Set action: deny in the PolicyLayer policy for apply_leave. 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.

What MCP server provides apply_leave? +

apply_leave is provided by the HR Assistant Agent MCP server (nishu8875/hr-assistant-agent). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.