Apply runtime token overrides on top of the active preset (deep merged). Overrides are applied in memory only unless persist: true writes them to disk. Useful for per-client accent color changes without creating a full preset. Args: - overrides (object): Partial DesignTokens object (deeply merged...
AI agents use apply_token_overrides to create or update resources in UI Preset MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your UI Preset MCP Server environment.
This tool modifies design token data either in memory or persists changes to disk via the persist flag. While reversible (tokens can be changed again or the override file deleted), it creates or modifies stored configuration data. It does not delete data (Destructive), execute arbitrary code (Execute), move money (Financial), or merely read data (Read).
From the tool's definition Tool description states it 'Apply runtime token overrides' and 'persist: true writes them to disk'. The persist parameter explicitly enables writing to 'preset/overrides.json on disk', making this a data modification operation.
Attacks that exploit this kind of access
Apply runtime token overrides on top of the active preset (deep merged). Overrides are applied in memory only unless persist: true writes them to disk. Useful for per-client accent color changes without creating a full preset. Args: - overrides (object): Partial DesignTokens object (deeply merged over active tokens) - persist (boolean): Write overrides to preset/overrides.json on disk (default: false) Example overrides: {. It is categorised as a Write tool in the UI Preset MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the UI Preset MCP Server MCP server in PolicyLayer and add a rule for apply_token_overrides: 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 UI Preset MCP Server. Nothing to install.
apply_token_overrides 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 apply_token_overrides 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 apply_token_overrides. 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.
apply_token_overrides is provided by the UI Preset MCP Server MCP server (ncsound919/og-glass). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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