jsr_create_scope · JSR MCP: Risk & Policy

WHAT IT DOES

What jsr_create_scope does on JSR MCP

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

WHY IT NEEDS A POLICY

Why jsr_create_scope needs a policy

Creating a new scope in a registry is a write operation that modifies the system state by adding a new organizational entity. It is reversible via deletion (jsr_delete_scope exists as a sibling tool), so it does not qualify as Destructive.

From the tool's definition Tool name is 'jsr_create_scope' and description states 'Create a new scope (requires authentication)'. The verb 'Create' indicates the tool creates new data (a scope) in the JSR registry.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

jsr_create_scope Rate-limited

jsr_create_scope 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": {
    "jsr_create_scope": {
      "limits": [
        {
          "counter": "jsr_create_scope_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 JSR MCP, so you can run agents against it safely.

FAQ

Questions about jsr_create_scope

What does the jsr_create_scope tool do? +

Create a new scope (requires authentication). It is categorised as a Write tool in the JSR 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 jsr_create_scope? +

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

What risk level is jsr_create_scope? +

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

Can I rate-limit jsr_create_scope? +

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

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

jsr_create_scope is provided by the JSR MCP server (wyattjoh/jsr-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.