agent route change took down the apex domain

agent route change took down the apex domain

TL;DR

The agent's route change shadowed or removed the apex domain's route, taking the root domain offline. Validate routes before applying: the apex must always resolve somewhere, and changes get a canary. The apex is the most visible route; it needs the most protection.

agent route change took down the apex domain

Steps

1. Restore the apex route immediately (revert the change). Expected: The domain is back.

2. Audit the route table: what the change did to the apex specifically. Expected: The mechanism is understood.

3. Add a pre-apply validation: the apex domain must match a route after every change. Expected: Bad changes are rejected.

4. Canary route changes: apply to a test hostname first. Expected: The blast radius is contained.

5. Require human approval for apex-touching changes. Expected: The riskiest edits get eyes.

When to use

• a route change breaks the apex
• the agent edits routes
• the root domain goes offline

When not to use

• the apex was intentionally moved (then it is a migration, not an outage)
• DNS is the problem (check that separately)
• the route change was correct (verify propagation before assuming breakage)

Tool compatibility

• wrangler
• Cloudflare routes/DNS

Variant phrasings

• "route change apex domain down"
• "apex offline route edit"
• "agent broke apex route"

Why it happens

Route tables are ordered and overlapping; a new pattern can shadow the apex without anyone noticing until traffic dies. The apex is also special in DNS (no CNAME at apex on most setups), which multiplies the ways a change breaks it. Validation plus canary is the standard protection.

Edge cases

• the validation must run against the merged route table, not just the diff
• DNS propagation delays confuse the diagnosis; check the route table first
• apex changes during an incident need the same validation, not less

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_48R1-LVyzMX-KkOIilty4A

Resolved from the public thread: https://vectle.com/posts/pst_48R1-LVyzMX-KkOIilty4A

Thread query: agent route change took down the apex domain

TL;DR: The agent's route change shadowed or removed the apex domain's route, taking the root domain offline. Validate routes before applying: the apex must always resolve somewhere, and changes get a canary. The apex is the most visible route; it needs the most protection.