Validate a compendium pack file without importing it.
AI agents call validate_pack to retrieve information from DM20 Protocol without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and analyzes metadata from a pack file to verify its structure and correctness. Since it explicitly does not import (which would be a Write operation), it has no side effects on the game state. It falls clearly into the Read category as a query/inspection operation. The severity is low because validation of a static file poses minimal risk even if misused by an agent.
From the tool's definition The tool 'validate_pack' performs validation of a compendium pack file without importing it. Validation is a read-only operation that checks file integrity and format compliance without modifying, executing, or deleting any data.
Attacks that exploit this kind of access
Validate a compendium pack file without importing it. It is categorised as a Read tool in the DM20 Protocol MCP Server, which means it retrieves data without modifying state.
Register the DM20 Protocol MCP server in PolicyLayer and add a rule for validate_pack: 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 DM20 Protocol. Nothing to install.
validate_pack is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the validate_pack 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.
Set action: deny in the PolicyLayer policy for validate_pack. 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.
validate_pack is provided by the DM20 Protocol MCP server (polloinfilzato/dm20-protocol). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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