patch_usage_metadata · Tensorus MCP: Risk & Policy

WHAT IT DOES

What patch_usage_metadata does on Tensorus MCP

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

WHY IT NEEDS A POLICY

Why patch_usage_metadata needs a policy

This tool modifies metadata associated with a tensor descriptor but does not delete, execute code, move money, or trigger external operations. Patching metadata is a reversible write operation.

From the tool's definition Tool name 'patch_usage_metadata' indicates modification of metadata. Description explicitly states 'Patch usage metadata for a given tensor descriptor,' confirming it updates/modifies existing data (a metadata patch operation).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

patch_usage_metadata Rate-limited

patch_usage_metadata 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_usage_metadata": {
      "limits": [
        {
          "counter": "patch_usage_metadata_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 Tensorus MCP, so you can run agents against it safely.

FAQ

Questions about patch_usage_metadata

What does the patch_usage_metadata tool do? +

Patch usage metadata for a given tensor descriptor. It is categorised as a Write tool in the Tensorus MCP 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_usage_metadata? +

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

What risk level is patch_usage_metadata? +

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

Can I rate-limit patch_usage_metadata? +

Yes. Add a rate_limit block to the patch_usage_metadata 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_usage_metadata completely? +

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

patch_usage_metadata is provided by the Tensorus MCP server (tensorus/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.