jsr_deny_authorization · JSR MCP: Risk & Policy

WHAT IT DOES

What jsr_deny_authorization does on JSR MCP

AI agents use jsr_deny_authorization 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_deny_authorization needs a policy

Denying an authorization is a reversible state change — it sets an authorization to denied/rejected status. This is a Write operation (modifying authorization state), not Destructive since the authorization record likely persists and could potentially be re-approved. However, it does block access which could have downstream effects. Severity is medium because misuse could block legitimate authorization flows.

From the tool's definition Deny an authorization (requires authentication)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

jsr_deny_authorization Rate-limited

jsr_deny_authorization 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_deny_authorization": {
      "limits": [
        {
          "counter": "jsr_deny_authorization_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_deny_authorization

What does the jsr_deny_authorization tool do? +

Deny an authorization (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_deny_authorization? +

Register the JSR MCP server in PolicyLayer and add a rule for jsr_deny_authorization: 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_deny_authorization? +

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

Can I rate-limit jsr_deny_authorization? +

Yes. Add a rate_limit block to the jsr_deny_authorization 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_deny_authorization completely? +

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

jsr_deny_authorization 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.