Add a new mode to an existing variable collection (e.g. Light/Dark, Desktop/Mobile). IMPORTANT — Figma free plan only allows 1 mode per collection; calling this tool on a free-plan account will return the error 'Limited to 1 modes only'. If that error occurs, stop retrying and switch to the name-...
Part of the Figma Mcp Go server.
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AI agents use add_variable_mode 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 add_variable_mode 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": {
"add_variable_mode": {
"limits": [
{
"counter": "add_variable_mode_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 add_variable_mode 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.
Add a new mode to an existing variable collection (e.g. Light/Dark, Desktop/Mobile). IMPORTANT — Figma free plan only allows 1 mode per collection; calling this tool on a free-plan account will return the error 'Limited to 1 modes only'. If that error occurs, stop retrying and switch to the name-prefix workaround: keep the single default mode and create variables prefixed by mode, e.g. 'light/color-bg' and 'dark/color-bg' in the same collection. Tell the user that native multi-mode variables require a paid Figma plan (Professional or above).. 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 add_variable_mode: 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.
add_variable_mode 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 add_variable_mode 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 add_variable_mode. 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.
add_variable_mode 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.
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