This record as markdown: /tools/sbox/bake-navmesh.md
What bake_navmesh does on Sbox
AI agents invoke bake_navmesh to trigger actions in Sbox. 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 bake_navmesh is rated High
Baking a navmesh is an execution/build operation that processes the scene geometry to generate navigation data. It triggers an external computation with side effects on the scene state. It's not purely destructive (original geometry is preserved) but it does modify/generate assets and is more than a simple write — it executes a build pipeline.
From the tool's definition "bake_navmesh" and "Enable + bake the active scene" — baking a navmesh triggers a computation/build process on the active scene
Attacks that exploit this kind of access
The rule that runs bake_navmesh safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Sbox, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For bake_navmesh, this is the rule to start with:
bake_navmesh 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.
The button opens the PolicyLayer dashboard: create your workspace, connect Sbox, apply this rule, and every bake_navmesh call is checked against it from then on.
Questions about bake_navmesh
Enable + bake the active scene. It is categorised as a Execute tool in the Sbox MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Sbox MCP server in PolicyLayer and add a rule for bake_navmesh: 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 Sbox. Nothing to install.
bake_navmesh is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the bake_navmesh 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 bake_navmesh. 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.
bake_navmesh is provided by the Sbox MCP server (sbox-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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