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 MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
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. Intercept'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.
tools:
add_variable_mode:
rules:
- action: allow
rate_limit:
max: 30
window: 60See the full Figma Mcp Go policy for all 73 tools.
Agents calling write-class tools like add_variable_mode have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.
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.
Add a rule in your Intercept YAML policy under the tools section for add_variable_mode. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Figma Mcp Go MCP server.
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 Intercept 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 Intercept 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). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept