brick_place
Place one or more bricks. Input is CSV — one brick per line, columns: typeId,x,y,z,rotation,color. Rows are auto-sorted by Y ascending so supports always land before dependents (your CSV order need not be bottom-up). Batch cap: max ${MAX_BATCH_ROWS} rows AND max ${MAX_NEW_TYPES_PER_BATCH} new par...
This record as markdown: /tools/dend-brick-mcp-app/brick-place.md
What brick_place does on Brick Builder MCP App
AI agents use brick_place to create or update resources in Brick Builder MCP App, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Brick Builder MCP App environment.
Why brick_place is rated Medium
This tool writes new brick data into the scene state. It is a creation/modification operation with clear reversibility (bricks can be removed via brick_remove_brick). It does not execute code, delete data irreversibly, or involve financial transactions. Severity is medium because misuse could corrupt or clutter a scene but is easily undone.
From the tool's definition 'Place one or more bricks' — creates/adds brick objects to a 3D scene with reversible placement (sibling tool brick_remove_brick exists for reversal)
Attacks that exploit this kind of access
The rule that runs brick_place safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Brick Builder MCP App, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For brick_place, this is the rule to start with:
brick_place stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Brick Builder MCP App, apply this rule, and every brick_place call is checked against it from then on.
Questions about brick_place
Place one or more bricks. Input is CSV — one brick per line, columns: typeId,x,y,z,rotation,color. Rows are auto-sorted by Y ascending so supports always land before dependents (your CSV order need not be bottom-up). Batch cap: max ${MAX_BATCH_ROWS} rows AND max ${MAX_NEW_TYPES_PER_BATCH} new part types per call — rows beyond either cap are deferred with a clear error (resend them in a follow-up call). Returns a per-row result array: {ok:true, footprint, snappedFrom?} or {ok:false, error, suggestedY?|suggestedX?|suggestedZ?, collidingWith?}. Support failures include suggestedY (nearest valid landing). Collision failures include collidingWith (blocker brick + footprint) and suggestedX/Z (nearest open slot within 8 studs). Bounds failures include suggestedX/Z/Y clamped to valid range. Call brick_render_scene first to open the viewer. Keep batches small (~10 rows) — use the footprints in results to position your next call. It is categorised as a Write tool in the Brick Builder MCP App MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Brick Builder MCP App MCP server in PolicyLayer and add a rule for brick_place: 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 Brick Builder MCP App. Nothing to install.
brick_place is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the brick_place 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 brick_place. 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.
brick_place is provided by the Brick Builder MCP App MCP server (dend/brick-mcp-app). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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