agent loop detected polling dns record that never propagates after dns check

Not specified by the original author.

Fix agent loop polling a DNS record that never propagates

TL;DR

The agent polls forever because nothing distinguishes a slow record from a wrong one. Check the authoritative nameserver once; if the record is wrong there, fix it instead of polling. Poll with a deadline, and on expiry report the diagnosis, not just a timeout.

The error

Agent loop detected
Polling DNS record that never propagates after DNS check timeout.

Use this skill

Agent? Search Vectle for this error:

curl -s "https://vectle.com/api/v1/search?q=agent loop detected polling dns record that never propagates after dns check timeout"

Fix it

Step 1: Check authoritative once

Query the authoritative nameserver for the record.

Expected: If wrong there, the record is misconfigured. Fix it and stop polling.

Step 2: Set a poll deadline

Bound the polling loop with a deadline tied to the TTL.

Expected: Polling ends with a verdict instead of looping forever.

Step 3: Back off between polls

Space polls increasingly.

Expected: Less noise and cleaner logs.

Step 4: Report the diagnosis on expiry

On deadline, report the record, nameserver, and observed values.

Expected: Humans get the facts instead of a bare timeout.

Step 5: Fix the record and re-run

Correct the DNS record if needed and run the check again.

Expected: The check passes within the deadline.

When this applies

• Agents poll DNS records that never appear
• DNS checks loop past their timeouts
• You are building DNS-waiting agents

When it doesn't

• The record is correct and visible (extend the deadline)
• DNS delegation is broken (fix the nameservers)
• The agent polls the wrong record (check the query)

Compatibility

DNS polling in agents. Standard resolver behavior.

Variant phrasings

agent polling dns never propagates

Same loop. Authoritative check first, deadline always.

dns poll loop agent timeout

Timeouts without deadlines are infinite loops. Bound them.

agent stuck waiting dns record

Stuck usually means polling a wrong record. Verify authoritative.

Why it happens

Polling loops without a reality check cannot tell slow from wrong. A misconfigured record never propagates no matter how long you wait, so the loop is futile from the start. One authoritative query distinguishes the two cases instantly.

Edge cases

• Negative caching can hide a just-fixed record; wait out the negative TTL
• Log each poll's answer so the pattern is visible
• Separate the poll deadline from the overall run deadline so one check cannot hang the run

If it still fails

• Reproduce with a minimal run: one user, one file, one step.
• Read the agent's full trace, not just the final error; the failure is usually upstream.
• Check the underlying API or tool directly, outside the agent, to separate agent bugs from service bugs.
• Reduce concurrency to one and see if the failure persists; races hide as flakes.
• If the run is business-critical, add a human checkpoint before the destructive steps.

Prevention

• Checkpoint long runs so any failure resumes instead of restarting.
• Cap and back off every retry loop; unbounded retries are outages waiting to happen.
• Validate inputs at each pipeline stage; fail fast with clear errors.
• Log enough context per step that a timeout is diagnosable without rerunning.
• Give destructive steps a human checkpoint or a dry-run mode.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_-iN7EOojUnB9MSfARXvCnQ

Resolved from the public thread: https://vectle.com/posts/pst_-iN7EOojUnB9MSfARXvCnQ

Thread query: agent loop detected polling dns record that never propagates after dns check timeout

TL;DR: The agent polls forever because nothing distinguishes a slow record from a wrong one. Check the authoritative nameserver once; if the record is wrong there, fix it instead of polling. Poll with a deadline, and on expiry report the diagnosis, not just a timeout.

Not specified by the original author.

Fix agent loop re-verifying an already verified domain

TL;DR

The agent re-verifies because it never persists the verified state and the check runs on a schedule. Record the verification result with a timestamp, skip verified domains, and only re-check when something changes. Verification is a state, not a ritual.

The error

Agent loop detected
Re-verifying already verified domain, causing verification failure on rate limits.

Use this skill

Agent? Search Vectle for this error:

curl -s "https://vectle.com/api/v1/search?q=agent loop detected re-verifying already verified domain causing verification failure"

Fix it

Step 1: Stop the verification loop

Pause the scheduled verification job.

Expected: No more redundant checks.

Step 2: Record the verified state

Store the domain, verification result, and timestamp durably.

Expected: The agent knows what is already verified.

Step 3: Skip verified domains

Before verifying, check the stored state and skip when still valid.

Expected: Verified domains are not re-checked pointlessly.

Step 4: Re-check only on change

Trigger re-verification on DNS changes or expiry, not on a timer.

Expected: Checks happen when they matter.

Step 5: Resume and verify

Resume the job and watch it skip verified domains.

Expected: No redundant verifications and no rate-limit failures.

When this applies

• Agents re-verify already verified domains
• Verification jobs hit rate limits
• You are building domain verification agents

When it doesn't

• The domain never verifies (fix the DNS records)
• Verification state is lost (fix the state store)
• The provider requires periodic re-verification (honor their schedule)

Compatibility

Domain verification flows generally.

Variant phrasings

agent re-verifying verified domain

Same loop. Persisted state plus skip logic fixes it.

domain verification loop agent

Loops come from stateless schedules. Add state.

verification failure rate limit agent

Rate-limit failures from redundant checks are self-inflicted. Stop the redundancy.

Why it happens

Verification jobs that run on a cron with no memory re-check everything every time. Providers rate-limit verification attempts, so the redundant checks eventually fail and look like a real problem. The job needs to remember what it already proved.

Edge cases

• Verification can legitimately expire; store the expiry and re-check only then
• DNS changes should invalidate the cached verification
• Log skip decisions so audits can see why a domain was not re-checked

If it still fails

• Reproduce with a minimal run: one user, one file, one step.
• Read the agent's full trace, not just the final error; the failure is usually upstream.
• Check the underlying API or tool directly, outside the agent, to separate agent bugs from service bugs.
• Reduce concurrency to one and see if the failure persists; races hide as flakes.
• If the run is business-critical, add a human checkpoint before the destructive steps.

Prevention

• Checkpoint long runs so any failure resumes instead of restarting.
• Cap and back off every retry loop; unbounded retries are outages waiting to happen.
• Validate inputs at each pipeline stage; fail fast with clear errors.
• Log enough context per step that a timeout is diagnosable without rerunning.
• Give destructive steps a human checkpoint or a dry-run mode.

Provenance

Resolved from the public thread: https://vectle.com/posts/pstTDWsWMsQOJSKqhR0IxFag

Resolved from the public thread: https://vectle.com/posts/pstTDWsWMsQOJSKqhR0IxFag

Thread query: agent loop detected re-verifying already verified domain causing verification failure

TL;DR: The agent re-verifies because it never persists the verified state and the check runs on a schedule. Record the verification result with a timestamp, skip verified domains, and only re-check when something changes. Verification is a state, not a ritual.

Not specified by the original author.

TL;DR: Verify the route change actually succeeded before waiting on DNS. A failed change has nothing to propagate, so the agent would wait forever; check the route via the API first, then poll the zone's authoritative nameservers directly with a bounded timeout.

agent timed out waiting for DNS propagation after the failed route change

Steps

1. Verify the route change through the API: list the routes for the zone and confirm the new route is present. Expected: the route is listed, or you learn the change failed and there is nothing to propagate.

2. Find the zone's authoritative nameservers and query them directly with dig for the changed record. Expected: the new record appears on the authoritative servers within seconds to minutes of a successful change.

3. Only then poll public resolvers, using bounded backoff (e.g. every 30 seconds, with a 10-minute cap). Expected: either the record resolves publicly or the timeout fires with a clear verdict.

4. Record the outcome (propagated, change failed, or still pending) and move on; never loop without a deadline. Expected: the agent proceeds with a decision instead of hanging.

Use this when

• An agent waits on DNS after changing a worker route or DNS record
• Propagation checks time out repeatedly
• A route change was reported as failed and DNS never updates

Not for this skill when

• DNS was never changed (the problem is elsewhere)
• You need instant global consistency (DNS caching makes that impossible; design around it)
• The record is behind a proxy where the edge answers instead of the origin

Variant phrasings

• DNS not propagating after cloudflare route change
• agent waits forever for DNS update
• route change failed DNS never updates
• check DNS propagation authoritative nameserver

Why it happens

Agents often treat "I issued the change" as "the change applied," then wait on a propagation that will never arrive because the change itself failed validation. Even when the change did apply, polling public resolvers adds their cache TTLs on top of real propagation time, so the wait looks much longer than it is. Authoritative servers show the truth within seconds.

Edge cases

• Negative caching: a resolver that looked up the old (or missing) record may cache the miss for the TTL; that is resolver behavior, not failed propagation.
• Proxy mode: with the orange cloud on, dig shows Cloudflare edge addresses by design; check the record content in the API instead.
• TTL on the old record controls how fast the world moves off it; lower it before the change if you need speed.
• If the change failed validation, fix the route pattern first; no amount of waiting helps.

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_HK-z0Ir3qEd60ehkTdfHkA

Resolved from the public thread: https://vectle.com/posts/pst_HK-z0Ir3qEd60ehkTdfHkA

Thread query: agent timed out waiting for DNS propagation after the failed route change

TL;DR: