apply_fixes · Osv Ui MCP: Risk & Policy

WHAT IT DOES

What apply_fixes does on Osv Ui

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

WHY IT NEEDS A POLICY

Why apply_fixes needs a policy

An AI agent can call apply_fixes faster than any human can review — one bad instruction and it creates or modifies resources in Osv Ui by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

apply_fixes Rate-limited

apply_fixes 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": {
    "apply_fixes": {
      "limits": [
        {
          "counter": "apply_fixes_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 Osv Ui, so you can run agents against it safely.

FAQ

Questions about apply_fixes

What does the apply_fixes tool do? +

Execute package upgrade commands to fix CVEs. It is categorised as a Write tool in the Osv Ui MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on apply_fixes? +

Register the Osv Ui MCP server in PolicyLayer and add a rule for apply_fixes: 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 Osv Ui. Nothing to install.

What risk level is apply_fixes? +

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

Can I rate-limit apply_fixes? +

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

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

apply_fixes is provided by the Osv Ui MCP server (toan203/osv-ui). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.