apply_filter · Graphics MCP: Risk & Policy

WHAT IT DOES

What apply_filter does on Graphics

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

WHY IT NEEDS A POLICY

Why apply_filter needs a policy

Based on the naming pattern and server context, apply_filter likely applies a visual filter to an image, modifying it (reversibly in principle, though it may overwrite the original file). This fits the Write category. Confidence is reduced because the description is empty, leaving the exact behavior (in-place overwrite vs. new file creation) unknown. Severity is medium given potential to overwrite image files.

From the tool's definition Tool name 'apply_filter' on a graphics manipulation server with sibling tools like convert_image, crop_image, flip_image, resize_image, rotate_image — all of which modify images in place or produce modified outputs.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

apply_filter Rate-limited

apply_filter 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": {
    "apply_filter": {
      "limits": [
        {
          "counter": "apply_filter_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 Graphics, so you can run agents against it safely.

FAQ

Questions about apply_filter

What does the apply_filter tool do? +

apply_filter. It is categorised as a Write tool in the Graphics MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on apply_filter? +

Register the Graphics MCP server in PolicyLayer and add a rule for apply_filter: 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 Graphics. Nothing to install.

What risk level is apply_filter? +

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

Can I rate-limit apply_filter? +

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

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

apply_filter is provided by the Graphics MCP server (lesleslie/graphics-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.