Create a new variable (design token) inside an existing collection. Returns the new variable's ID. Use get_variable_defs to find collection IDs, set_variable_value to set values per mode, and bind_variable_to_node to apply the variable to a node property.
Part of the Figma Mcp Go server.
Free to start. No card required.
AI agents use create_variable to create or modify resources in Figma Mcp Go. 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 create_variable 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 Mcp Go.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"create_variable": {
"limits": [
{
"counter": "create_variable_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Figma Mcp Go policy for all 73 tools.
These attack patterns abuse exactly the kind of access create_variable 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.
Create a new variable (design token) inside an existing collection. Returns the new variable's ID. Use get_variable_defs to find collection IDs, set_variable_value to set values per mode, and bind_variable_to_node to apply the variable to a node property.. It is categorised as a Write tool in the Figma Mcp Go MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Figma Mcp Go MCP server in PolicyLayer and add a rule for create_variable: 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 Mcp Go. Nothing to install.
create_variable 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 create_variable 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 create_variable. 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.
create_variable is provided by the Figma Mcp Go MCP server (@vkhanhqui/figma-mcp-go). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 73 Figma Mcp Go tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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