http_patch · Http Client MCP: Risk & Policy

WHAT IT DOES

What http_patch does on Http Client

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

WHY IT NEEDS A POLICY

Why http_patch needs a policy

PATCH semantics indicate partial modification of a resource (Write category). The description is empty, so classification relies solely on the tool name and HTTP method convention. Severity is high because an AI agent could use this to modify arbitrary remote resources, but confidence is reduced due to the lack of description.

From the tool's definition Tool name 'http_patch' — PATCH is a standard HTTP method for partial updates to existing resources.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

http_patch Rate-limited

http_patch 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": {
    "http_patch": {
      "limits": [
        {
          "counter": "http_patch_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 Http Client, so you can run agents against it safely.

FAQ

Questions about http_patch

What does the http_patch tool do? +

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

How do I enforce a policy on http_patch? +

Register the Http Client MCP server in PolicyLayer and add a rule for http_patch: 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 Http Client. Nothing to install.

What risk level is http_patch? +

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

Can I rate-limit http_patch? +

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

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

http_patch is provided by the Http Client MCP server (keijeizei/http-client-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.