AI agents call calculate_movement to retrieve information from ChatRPG without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs geometric/spatial calculations within a game context. It computes movement paths and reachable squares based on terrain data. There is no indication it modifies any state; it only returns computed information, making it a Read-category tool with low severity.
From the tool's definition 'Calculate movement paths, reachable squares, or adjacent squares with terrain support' — pure calculation/query with no side effects
Attacks that exploit this kind of access
Calculate movement paths, reachable squares, or adjacent squares with terrain support. It is categorised as a Read tool in the ChatRPG MCP Server, which means it retrieves data without modifying state.
Register the ChatRPG MCP server in PolicyLayer and add a rule for calculate_movement: 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.
calculate_movement 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 calculate_movement 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 calculate_movement. 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.
calculate_movement 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.
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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