patch_artifact · Web Gui MCP: Risk & Policy

WHAT IT DOES

What patch_artifact does on Web Gui

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

WHY IT NEEDS A POLICY

Why patch_artifact needs a policy

Patching is a write operation that modifies existing artifacts. The tool name strongly suggests reversible updates to artifact data stored in memory. Without a detailed description, confidence is slightly reduced, but the context of artifact management and the patch operation's reversible nature (contrast with destructive deletion) place this firmly in Write rather than Destructive.

From the tool's definition Tool name 'patch_artifact' indicates modification of stored artifacts. The server description states it supports 'storing artifacts in memory', and patch operations modify existing data reversibly.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

patch_artifact Rate-limited

patch_artifact 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": {
    "patch_artifact": {
      "limits": [
        {
          "counter": "patch_artifact_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 Web Gui, so you can run agents against it safely.

FAQ

Questions about patch_artifact

What does the patch_artifact tool do? +

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

How do I enforce a policy on patch_artifact? +

Register the Web Gui MCP server in PolicyLayer and add a rule for patch_artifact: 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 Web Gui. Nothing to install.

What risk level is patch_artifact? +

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

Can I rate-limit patch_artifact? +

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

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

patch_artifact is provided by the Web Gui MCP server (thehzuo/gui-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.