sanity_patch · Sanity MCP Server MCP: Risk & Policy

WHAT IT DOES

What sanity_patch does on Sanity MCP Server

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

WHY IT NEEDS A POLICY

Why sanity_patch needs a policy

This tool modifies document content but does not delete or destroy data (which would be Destructive), nor does it execute arbitrary code (Execute), nor does it move money (Financial). Partial updates are reversible through subsequent patches or rollbacks.

From the tool's definition Tool description: 'Partially update a document.' The verb 'update' and qualifier 'partially' indicate reversible modification of existing data. The requirement for a 'write token' confirms this is a write operation, not read-only.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sanity_patch Rate-limited

sanity_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": {
    "sanity_patch": {
      "limits": [
        {
          "counter": "sanity_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 Sanity MCP Server, so you can run agents against it safely.

FAQ

Questions about sanity_patch

What does the sanity_patch tool do? +

Partially update a document. Requires write token. It is categorised as a Write tool in the Sanity MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sanity_patch? +

Register the Sanity MCP Server MCP server in PolicyLayer and add a rule for sanity_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 Sanity MCP Server. Nothing to install.

What risk level is sanity_patch? +

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

Can I rate-limit sanity_patch? +

Yes. Add a rate_limit block to the sanity_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 sanity_patch completely? +

Set action: deny in the PolicyLayer policy for sanity_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 sanity_patch? +

sanity_patch is provided by the Sanity MCP Server MCP server (purple-horizons/sanity-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.