So I finally did it. Tired of seeing our agent runtime phone home to a dozen different "metrics" and "telemetry" endpoints, I built a proper egress allowlist. Used the runtime's own documentation, whitelisted the essential API endpoints for its core function, and locked everything else down.

The result? The agent's performance is now... glacial. Tasks that took seconds now timeout. The dashboard shows it's "healthy" but barely functioning. The devs are pointing at my firewall rules. I'm pointing at their bloated, chatty runtime.

I know the default config tries to reach out to half the internet. But between the docs saying "these endpoints are required" and the reality of what it *actually* needs, there's a Grand Canyon-sized gap. I suspect it's failing silently on some ancillary call and retrying forever.

What's the move here? Do I:
1. Run it in a sandbox with full permissive egress, log everything, and try to derive a *true* minimal list? Tools for this?
2. Is there a known pattern for these agent runtimes where they have a primary function endpoint, but also depend on some auxiliary service (like a time server, a geo-IP DB, or a *shudder* telemetry collector) that's not documented?
3. How do you keep this list from breaking every time the runtime auto-updates? Do I have to treat the agent's network profile as part of its SBOM?

```bash
# My current allowlist (example, not the actual domains)
*.core-agent-service.com:443
*.blob-storage.agent-provider.net:443
updates.runtime-company.com:443
```
Feels wrong already. Wildcards are a code smell in an allowlist.

Check your hashes.