tilemap_set_cells_rect
Paint every cell in a rectangular region of a TileMapLayer with one tile (undoable, one action). source_id -1 clears the region. Capped at 65536 cells; split larger fills across calls.
This record as markdown: /tools/breakpoint-mcp/tilemap-set-cells-rect.md
What tilemap_set_cells_rect does on Breakpoint
AI agents use tilemap_set_cells_rect to create or update resources in Breakpoint, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Breakpoint environment.
| Parameter | Type | Required | Description |
|---|---|---|---|
path | string | Yes | TileMapLayer node path relative to the scene root |
rect | array | Yes | Region [x, y, width, height] in cells (width/height > 0) |
confirm | boolean | — | Skip the confirmation prompt (auto-approve) |
source_id | integer | — | Atlas source id from the bound TileSet, or -1 to clear (default -1) |
alternative | integer | — | Alternative tile id (default 0) |
atlas_coords | array | — | Tile atlas coordinates [x, y] within the source (default [0, 0]) |
Parameters from the server's own tool schema.
Why tilemap_set_cells_rect is rated Medium
This tool creates or modifies tilemap data reversibly. While it affects a potentially large area (capped at 65536 cells), the operation is explicitly undoable and does not irreversibly destroy data or execute arbitrary code. It fits the Write category (modifies data reversibly).
From the tool's definition Tool modifies tilemap cell data by painting cells in a rectangular region with a tile or clearing cells (source_id -1). Description states it is "undoable" and performs "one action", indicating reversible modification of game scene data.
Risk signalsAccepts file system path (path) · Bulk/mass operation — affects multiple targets
Attacks that exploit this kind of access
The rule that runs tilemap_set_cells_rect safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Breakpoint, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For tilemap_set_cells_rect, this is the rule to start with:
tilemap_set_cells_rect 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 Breakpoint, apply this rule, and every tilemap_set_cells_rect call is checked against it from then on.
Questions about tilemap_set_cells_rect
Paint every cell in a rectangular region of a TileMapLayer with one tile (undoable, one action). source_id -1 clears the region. Capped at 65536 cells; split larger fills across calls. It is categorised as a Write tool in the Breakpoint MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
tilemap_set_cells_rect accepts 6 parameters: path, rect, confirm, source_id, alternative, atlas_coords. Required: path, rect. The full parameter table on this page comes from the server's own tool schema.
Register the Breakpoint MCP server in PolicyLayer and add a rule for tilemap_set_cells_rect: 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 Breakpoint. Nothing to install.
tilemap_set_cells_rect 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 tilemap_set_cells_rect 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 tilemap_set_cells_rect. 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.
tilemap_set_cells_rect is provided by the Breakpoint MCP server (breakpoint-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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