Medium Risk

theme

Set default chart theme

Risk signalsChanges chart visual style

Part of the Mcp Plots server.

theme can modify Mcp Plots data, with no limits today. PolicyLayer puts allow, deny, and rate-limit rules on every call. Live in minutes.

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AI agents use theme to create or modify resources in Mcp Plots. 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 theme 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 Mcp Plots.

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

policy.json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "theme": {
      "limits": [
        {
          "counter": "theme_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

See the full Mcp Plots policy for all 10 tools.

Get this rule live on your own Mcp Plots server in minutes. PolicyLayer enforces it on every call, before it runs.

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These attack patterns abuse exactly the kind of access theme gives an agent. Each links to the full case and the policy that stops it:

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Every attack above starts with a tool call. PolicyLayer checks each one against your policy first, so theme only ever does what you allow.

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Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.

What does the theme tool do? +

Set default chart theme. It is categorised as a Write tool in the Mcp Plots MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on theme? +

Register the Mcp Plots MCP server in PolicyLayer and add a rule for theme: 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 Mcp Plots. Nothing to install.

What risk level is theme? +

theme is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit theme? +

Yes. Add a rate_limit block to the theme 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.

How do I block theme completely? +

Set action: deny in the PolicyLayer policy for theme. 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.

What MCP server provides theme? +

theme is provided by the Mcp Plots MCP server (MR901/mcp-plots). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Plots tool call.

Deterministic rules across all 10 Mcp Plots tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

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