atp_claim_task · ATP Librarian MCP Server MCP: Risk & Policy

WHAT IT DOES

What atp_claim_task does on ATP Librarian MCP Server

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

WHY IT NEEDS A POLICY

Why atp_claim_task needs a policy

While 'claim' sounds like a simple read operation, the phrase 'zombie recovery and re-entry' indicates this tool modifies task state (transitioning tasks from unclaimed to claimed, or from zombie to active states). This is a reversible modification (tasks can be unclaimed or reclaimed), making it Write rather than Execute.

From the tool's definition Tool performs 'claim' operation which modifies task state (marking a task as claimed/assigned), potentially handles 'zombie recovery' state transitions, and manages task re-entry logic—these are state-modifying operations on a task dependency graph.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

atp_claim_task Rate-limited

atp_claim_task 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": {
    "atp_claim_task": {
      "limits": [
        {
          "counter": "atp_claim_task_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 ATP Librarian MCP Server, so you can run agents against it safely.

FAQ

Questions about atp_claim_task

What does the atp_claim_task tool do? +

Requests the next available task. Handles zombie recovery and re-entry. It is categorised as a Write tool in the ATP Librarian 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 atp_claim_task? +

Register the ATP Librarian MCP Server MCP server in PolicyLayer and add a rule for atp_claim_task: 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 ATP Librarian MCP Server. Nothing to install.

What risk level is atp_claim_task? +

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

Can I rate-limit atp_claim_task? +

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

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

atp_claim_task is provided by the ATP Librarian MCP Server MCP server (manuelcecchetto/atp-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.