manage_spell_slots · ChatRPG MCP: Risk & Policy

WHAT IT DOES

What manage_spell_slots does on ChatRPG

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

WHY IT NEEDS A POLICY

Why manage_spell_slots needs a policy

This tool modifies D&D game state by incrementing/decrementing spell slot counters and allowing DM overrides, which are classic Write operations—reversible state changes with no permanent deletion or code execution. The 'set' operation provides administrative override capability but remains a Write action.

From the tool's definition Tool performs reversible state modifications: 'expend (use slot)', 'restore (regain slots)', 'set (DM override)'. Description explicitly lists mutating operations on game state (spell slot counters).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

manage_spell_slots Rate-limited

manage_spell_slots 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": {
    "manage_spell_slots": {
      "limits": [
        {
          "counter": "manage_spell_slots_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 ChatRPG, so you can run agents against it safely.

FAQ

Questions about manage_spell_slots

What does the manage_spell_slots tool do? +

Manage D&D 5e spell slots. Operations: view (display slots), expend (use slot), restore (regain slots), set (DM override). Supports warlock pact magic (short rest recovery). Full/half/third casters calculated by class and level. Batch support for party spell tracking. It is categorised as a Write tool in the ChatRPG MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on manage_spell_slots? +

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

What risk level is manage_spell_slots? +

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

Can I rate-limit manage_spell_slots? +

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

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

manage_spell_slots is provided by the ChatRPG MCP server (mnehmos/mnehmos.chatrpg.game). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.