update_period · TreeBeam MCP Server MCP: Risk & Policy

WHAT IT DOES

What update_period does on TreeBeam MCP Server

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

WHY IT NEEDS A POLICY

Why update_period needs a policy

This tool modifies an existing accounting period record within a financial management platform. It's a write operation (update/modify) with no indication of irreversible deletion. However, in a financial context, modifying accounting periods can have significant downstream effects on financial reporting and records, warranting a medium severity rating.

From the tool's definition 'Update an existing accounting period within a project' — modifies existing data reversibly

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_period Rate-limited

update_period 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": {
    "update_period": {
      "limits": [
        {
          "counter": "update_period_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 TreeBeam MCP Server, so you can run agents against it safely.

FAQ

Questions about update_period

What does the update_period tool do? +

Update an existing accounting period within a project. It is categorised as a Write tool in the TreeBeam MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_period? +

Register the TreeBeam MCP Server MCP server in PolicyLayer and add a rule for update_period: 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 TreeBeam MCP Server. Nothing to install.

What risk level is update_period? +

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

Can I rate-limit update_period? +

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

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

update_period is provided by the TreeBeam MCP Server MCP server (treebeam-code/tb-mcpserver). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.