character_navigation · Melo MCP: Risk & Policy

WHAT IT DOES

What character_navigation does on Melo

AI agents invoke character_navigation to trigger actions in Melo. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why character_navigation needs a policy

This tool executes a pathfinding operation that moves a character within the Roblox environment, triggering an external game-state operation. It 'bypasses the input system,' meaning it programmatically forces movement rather than simulating user input. This is an Execute-category action — it runs an automated in-game behavior with real side effects on game state.

From the tool's definition Move a character to a position using pathfinding. Bypasses the input system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

character_navigation Rate-limited

character_navigation stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "character_navigation": {
      "limits": [
        {
          "counter": "character_navigation_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Melo, so you can run agents against it safely.

FAQ

Questions about character_navigation

What does the character_navigation tool do? +

Move a character to a position using pathfinding. Bypasses the input system. Args: - target (string | number[]): Instance path or [x, y, z] coordinates - timeout (number, optional): Max seconds to reach target (default: 30) Returns: { reached: boolean, finalPosition: [x, y, z], duration: number }. It is categorised as a Execute tool in the Melo MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on character_navigation? +

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

What risk level is character_navigation? +

character_navigation is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit character_navigation? +

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

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

character_navigation is provided by the Melo MCP server (yannyhl/linkedsword-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.