Execute JavaScript code to CREATE or MODIFY designs in Figma. ⚠️ MANDATORY: Call figma_docs BEFORE writing any design code. Skipping figma_docs causes hardcoded colors, wrong sizing, broken layouts, and low-quality UI. Use the figma proxy object — all methods return Promises, use async/await. Ope...
Risk signalsAccepts freeform code/query input (code)
Part of the Figma Ui server.
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AI agents use figma_write to create or modify resources in Figma Ui. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call figma_write repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Figma Ui.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"figma_write": {
"limits": [
{
"counter": "figma_write_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Figma Ui policy for all 5 tools.
These attack patterns abuse exactly the kind of access figma_write gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Execute JavaScript code to CREATE or MODIFY designs in Figma. ⚠️ MANDATORY: Call figma_docs BEFORE writing any design code. Skipping figma_docs causes hardcoded colors, wrong sizing, broken layouts, and low-quality UI. Use the figma proxy object — all methods return Promises, use async/await. Operations: create, modify, delete, clone, group, ungroup, flatten, resize, set_selection, set_viewport, batch (multiple ops in one call). Design Tokens: createVariableCollection, createVariable, setVariableValue, addVariableMode, renameVariableMode, removeVariableMode, applyVariable, setFrameVariableMode, clearFrameVariableMode, createPaintStyle, createTextStyle, createComponent. Prototyping: setReactions, getReactions, removeReactions (click/hover/press → navigate/overlay/swap with Smart Animate transitions). Scroll: setScrollBehavior (overflowDirection: NONE/HORIZONTAL/VERTICAL/BOTH). Variants: setComponentProperties, swapComponent, getComponentProperties. Component property definitions (master-side, required for instance text overrides to recalc auto-layout): addComponentProperty (TEXT/BOOLEAN/INSTANCE_SWAP), bindComponentPropertyToText, removeComponentProperty. The code runs in a sandboxed VM: no access to require, process, fs, fetch, or network.. It is categorised as a Write tool in the Figma Ui MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Figma Ui MCP server in PolicyLayer and add a rule for figma_write: 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 Figma Ui. Nothing to install.
figma_write 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 figma_write 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 figma_write. 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.
figma_write is provided by the Figma Ui MCP server (TranHoaiHung/figma-ui-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 Figma Ui tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.