a2a_task_update · Wmux MCP: Risk & Policy

WHAT IT DOES

What a2a_task_update does on Wmux

AI agents use a2a_task_update to create or update resources in Wmux — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Wmux environment.

WHY IT NEEDS A POLICY

Why a2a_task_update needs a policy

This tool modifies task state/properties but does not permanently delete or irreversibly destroy data. Updates are typically reversible (can be updated again or rolled back). It operates within a task management context on a Windows terminal multiplexer for AI agents.

From the tool's definition Tool name is 'a2a_task_update' with description 'Update a task'. The verb 'update' indicates modification of existing data in a reversible manner.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

a2a_task_update Rate-limited

a2a_task_update 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": {
    "a2a_task_update": {
      "limits": [
        {
          "counter": "a2a_task_update_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about a2a_task_update

What does the a2a_task_update tool do? +

Update a task\. It is categorised as a Write tool in the Wmux MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on a2a_task_update? +

Register the Wmux MCP server in PolicyLayer and add a rule for a2a_task_update: 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 Wmux. Nothing to install.

What risk level is a2a_task_update? +

a2a_task_update is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit a2a_task_update? +

Yes. Add a rate_limit block to the a2a_task_update 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 a2a_task_update completely? +

Set action: deny in the PolicyLayer policy for a2a_task_update. 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 a2a_task_update? +

a2a_task_update is provided by the Wmux MCP server (openwong2kim/wmux). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

// THE FULL RECORD

a2a_task_update is one line of Wmux's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

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