create_visualization · ContextForge MCP Gateway MCP

WHAT IT DOES

What create_visualization does on ContextForge MCP Gateway

AI agents use create_visualization to create or update resources in ContextForge MCP Gateway — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your ContextForge MCP Gateway environment.

WHY IT NEEDS A POLICY

Why create_visualization needs a policy

The tool creates new data (plots/charts) but does not execute arbitrary code, delete data irreversibly, move money, or trigger external side effects beyond visualization generation. It is a reversible write operation—generated visualizations can be overwritten or removed without permanent damage.

From the tool's definition Tool description states 'Generate statistical plots and charts', which creates new data artifacts (visualizations) that are stored and can be modified or deleted later.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_visualization Rate-limited

create_visualization stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "create_visualization": {
      "limits": [
        {
          "counter": "create_visualization_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches ContextForge MCP Gateway, so you can run agents against it safely.

FAQ

Questions about create_visualization

What does the create_visualization tool do? +

Generate statistical plots and charts. It is categorised as a Write tool in the ContextForge MCP Gateway MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_visualization? +

Register the ContextForge MCP Gateway MCP server in PolicyLayer and add a rule for create_visualization: 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 ContextForge MCP Gateway. Nothing to install.

What risk level is create_visualization? +

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

Can I rate-limit create_visualization? +

Yes. Add a rate_limit block to the create_visualization 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 create_visualization completely? +

Set action: deny in the PolicyLayer policy for create_visualization. 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 create_visualization? +

create_visualization is provided by the ContextForge MCP Gateway MCP server (jrmatherly/mcp-context-forge). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.