set_delegation_scope · Tenzro Ledger MCP: Risk & Policy

WHAT IT DOES

What set_delegation_scope does on Tenzro Ledger MCP

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

WHY IT NEEDS A POLICY

Why set_delegation_scope needs a policy

This tool modifies access control policies and spending authorization for a machine DID (decentralized identifier), which is a reversible write operation. It doesn't execute payments (Financial), delete data (Destructive), or run arbitrary operations (Execute).

From the tool's definition Tool description states 'Set spending limits and allowed operations for a machine DID' — this creates or modifies authorization rules for an entity.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_delegation_scope Rate-limited

set_delegation_scope 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": {
    "set_delegation_scope": {
      "limits": [
        {
          "counter": "set_delegation_scope_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 Tenzro Ledger MCP, so you can run agents against it safely.

FAQ

Questions about set_delegation_scope

What does the set_delegation_scope tool do? +

Set spending limits and allowed operations for a machine DID. It is categorised as a Write tool in the Tenzro Ledger 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 set_delegation_scope? +

Register the Tenzro Ledger MCP server in PolicyLayer and add a rule for set_delegation_scope: 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 Tenzro Ledger MCP. Nothing to install.

What risk level is set_delegation_scope? +

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

Can I rate-limit set_delegation_scope? +

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

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

set_delegation_scope is provided by the Tenzro Ledger MCP server (https://canton-mcp.tenzro.network/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.