sculpt_terrain
Apply a heightmap brush at (x, y) to MapBuilder. Modes: raise, lower, flatten, smooth. Modifies the current heightmap directly and rebuilds the mesh; survives between calls until you press Build Terrain again.
This record as markdown: /tools/sbox/sculpt-terrain.md
What sculpt_terrain does on Sbox
AI agents invoke sculpt_terrain 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 sculpt_terrain is rated High
This tool executes a sculpting operation on terrain with side effects (mesh rebuild, heightmap modification). While the changes are theoretically reversible before a final 'Build Terrain' action, the tool itself triggers real-time computational operations that alter game state.
From the tool's definition Apply a heightmap brush at (x, y) to MapBuilder. Modes: raise, lower, flatten, smooth. Modifies the current heightmap directly and rebuilds the mesh
Attacks that exploit this kind of access
The rule that runs sculpt_terrain 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 sculpt_terrain, this is the rule to start with:
sculpt_terrain 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 sculpt_terrain call is checked against it from then on.
Questions about sculpt_terrain
Apply a heightmap brush at (x, y) to MapBuilder. Modes: raise, lower, flatten, smooth. Modifies the current heightmap directly and rebuilds the mesh; survives between calls until you press Build Terrain again. 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 sculpt_terrain: 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.
sculpt_terrain 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 sculpt_terrain 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 sculpt_terrain. 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.
sculpt_terrain 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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