fill_to_psi · Timesheet Assistant MCP: Risk & Policy

WHAT IT DOES

What fill_to_psi does on Timesheet Assistant MCP

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

WHY IT NEEDS A POLICY

Why fill_to_psi needs a policy

This tool modifies and persists timesheet data in a shared project management system (PSI/SharePoint). While it does not delete or irreversibly destroy data, and does not involve financial transactions, it does write/update records in an HR/timesheet system.

From the tool's definition Tool description states 'Fill timesheet in PSI Project Server with selected task (saves but does not submit for approval)'. The action of filling and saving timesheet data is a create/modify operation that persists data to the PSI system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

fill_to_psi Rate-limited

fill_to_psi 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": {
    "fill_to_psi": {
      "limits": [
        {
          "counter": "fill_to_psi_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about fill_to_psi

What does the fill_to_psi tool do? +

Fill timesheet in PSI Project Server with selected task (saves but does not submit for approval). Use get_psi_tasks first to get available tasks and their indices. IMPORTANT: After filling all timesheets, you MUST ask the user:. It is categorised as a Write tool in the Timesheet Assistant MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on fill_to_psi? +

Register the Timesheet Assistant MCP server in PolicyLayer and add a rule for fill_to_psi: 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 Timesheet Assistant MCP. Nothing to install.

What risk level is fill_to_psi? +

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

Can I rate-limit fill_to_psi? +

Yes. Add a rate_limit block to the fill_to_psi 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 fill_to_psi completely? +

Set action: deny in the PolicyLayer policy for fill_to_psi. 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 fill_to_psi? +

fill_to_psi is provided by the Timesheet Assistant MCP server (sharadmathuratthepsi/timesheet-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.