wb_claim · Workbench MCP: Risk & Policy

WHAT IT DOES

What wb_claim does on Workbench

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

WHY IT NEEDS A POLICY

Why wb_claim needs a policy

This tool claims/assigns a task to an agent, which modifies task state (ownership/status) and creates snapshots of upstream dependencies. This is a reversible state change — a Write operation. It does not execute arbitrary code, delete data, or involve financial transactions. Severity is medium because misclaiming tasks in a pipeline could disrupt workflow ordering and gate integrity.

From the tool's definition 领取任务 (claim task) — gate 自动校验,上游依赖自动快照 (automatic gate validation, upstream dependency snapshot)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

wb_claim Rate-limited

wb_claim 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": {
    "wb_claim": {
      "limits": [
        {
          "counter": "wb_claim_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 Workbench, so you can run agents against it safely.

FAQ

Questions about wb_claim

What does the wb_claim tool do? +

领取任务(gate 自动校验,上游依赖自动快照). It is categorised as a Write tool in the Workbench MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on wb_claim? +

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

What risk level is wb_claim? +

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

Can I rate-limit wb_claim? +

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

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

wb_claim is provided by the Workbench MCP server (nvrenshiren/workbench). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.