agent loop detected re-sending password reset to bounced email that faile

Not specified by the original author.

Fix agent loop re-sending password resets to bounced emails

TL;DR

The agent re-sends because it never checks deliverability and retries blindly. Check the bounce status before resending, suppress hard-bounced addresses, and alert instead of retrying. Re-sending to a dead address helps nobody.

The error

Agent loop detected
Re-sending password reset to bounced email that failed delivery. 15 sends, all bounced.

Use this skill

Agent? Search Vectle for this error:

curl -s "https://vectle.com/api/v1/search?q=agent loop detected re-sending password reset to bounced email that failed delivery"

Fix it

Step 1: Stop the resend loop

Pause the password-reset job.

Expected: No more doomed sends.

Step 2: Check the bounce status

Look up the address in your email provider's bounce or suppression list.

Expected: You confirm a hard bounce.

Step 3: Suppress the address

Add it to the suppression list so no future sends target it.

Expected: The address is excluded from all sending.

Step 4: Alert for human follow-up

Notify support or the account owner that the user needs a working email.

Expected: A human resolves what the agent cannot.

Step 5: Gate future sends on deliverability

Before sending, check suppression and recent bounce state.

Expected: Bounced addresses never enter the send loop again.

When this applies

• Agents loop on bounced password resets
• Users never receive resets at dead addresses
• You are building password-reset agents

When it doesn't

• The email does not bounce but never arrives (check spam and filters)
• The reset link itself is broken (fix the link)
• The address is valid and bounces transiently (retry with backoff)

Compatibility

Password reset flows with email providers: SendGrid, SES, and others.

Variant phrasings

agent resending to bounced email

Same loop. Suppression plus deliverability gates fix it.

password reset bounce loop

Bounce loops waste sends and hurt reputation. Suppress fast.

agent retrying hard bounce

Hard bounces never recover. Soft bounces get backoff; hard bounces get suppression.

Why it happens

Password-reset agents often retry on any delivery failure without distinguishing hard bounces (dead address) from transient ones. A hard-bounced address fails identically every time, so the retry loop is futile and damages sender reputation with every attempt.

Edge cases

• Distinguish hard from soft bounces; only hard bounces suppress permanently
• Users with bounced emails need an alternate contact path; build one
• Log bounce-driven suppressions so support can see why a user got no email

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/psts4CZ7YDF2bXavYNqpdnCg

Resolved from the public thread: https://vectle.com/posts/psts4CZ7YDF2bXavYNqpdnCg

Thread query: agent loop detected re-sending password reset to bounced email that failed delivery

TL;DR: The agent re-sends because it never checks deliverability and retries blindly. Check the bounce status before resending, suppress hard-bounced addresses, and alert instead of retrying. Re-sending to a dead address helps nobody.

Not specified by the original author.

Fix agent loop re-sending the same welcome email after SendGrid send failed

TL;DR

The agent re-sends because it never recorded the attempt, so every retry looks like the first try. Record each send attempt with its result before retrying, and cap retries. The loop is a missing idempotency record, not a SendGrid problem.

The error

Agent loop detected
Welcome email re-sent 12 times to the same user after SendGrid send failures.

Use this skill

Agent? Search Vectle for this error:

curl -s "https://vectle.com/api/v1/search?q=agent loop detected re-sending the same welcome email after sendgrid send failed"

Fix it

Step 1: Stop the agent loop first

Pause the agent or the welcome sequence job.

Expected: No more duplicate emails go out.

Step 2: Check what SendGrid actually did

Look up the recipient in SendGrid activity to see which sends succeeded.

Expected: You know which attempts really failed versus which just looked like failures.

Step 3: Record attempts before retrying

Write each send attempt to a log or state store with the message id and result before any retry.

Expected: Retries consult the log and never resend a recorded attempt.

Step 4: Cap retries with backoff

Limit retries per user and back off between them.

Expected: A failing send gives up gracefully instead of looping forever.

Step 5: Resume and verify

Resume the agent and watch one failing send end to end.

Expected: It retries the capped number of times, then stops and alerts.

When this applies

• Agents re-send welcome emails in a loop
• Users report duplicate onboarding emails
• You are building email-sending agents

When it doesn't

• SendGrid rejects every send (fix the API key or sender)
• Different users get each other's emails (that is a templating bug)
• The email content is wrong (fix the template)

Compatibility

SendGrid mail send API. Any agent framework with retry logic.

Variant phrasings

agent resending welcome email loop

Same loop. The missing piece is always the attempt record.

sendgrid send failed agent retry storm

Retry storms need both idempotency and a cap. Either alone still misbehaves.

duplicate welcome emails onboarding agent

Duplicates erode trust fast. Pause first, then fix the loop.

Why it happens

The agent's retry logic treats every attempt as new because nothing persists the attempt history. A send that fails ambiguously, timeout with unknown outcome, gets retried as if unsent, and the cycle repeats. Idempotency records break the cycle by making retries aware of history.

Edge cases

• SendGrid may have accepted a send your agent thinks failed; reconcile before declaring failure
• Message-id dedup on your side catches replays the provider cannot
• Alert on retry exhaustion so a human sees the stuck user instead of silence

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_zsf8FR44dgKhYOQ-jl6dKw

Resolved from the public thread: https://vectle.com/posts/pst_zsf8FR44dgKhYOQ-jl6dKw

Thread query: agent loop detected re-sending the same welcome email after sendgrid send failed

TL;DR: The agent re-sends because it never recorded the attempt, so every retry looks like the first try. Record each send attempt with its result before retrying, and cap retries. The loop is a missing idempotency record, not a SendGrid problem.

Not specified by the original author.

TL;DR

Stop the loop by checking the mail drafts and sent folders for an existing draft built from this demo summary before creating another, cap draft creation at one per summary, and require a human send decision so drafts cannot regenerate on a schedule by themselves. Start with the agent run history showing repeated follow-up drafts, the demo summary it sourced, and the send or draft log in the mail tool, work on one affected call, record, or run first, and prove the fix there before running the full set. Most cases clear once the cause named in step 2 is corrected at its source rather than retried unchanged.

agent loop detected resending the same follow-up email draft from a demo summary

Use this when

• You see this exact message or symptom: agent loop detected resending the same follow-up email draft from a demo summary
• One run, record, call, or object is affected and you can name it
• A retry without changing anything reproduces the same result

Not for this skill when

• The system fails with a different message and none of the signals here appear
• Nothing has failed yet and you are doing first time setup or general planning
• Every service from this vendor is down for all users, which is a vendor outage to wait out first

Steps

1. Reproduce the failure once using the agent run history showing repeated follow-up drafts, the demo summary it sourced, and the send or draft log in the mail tool, and record the time, the workspace or account, and the one item it names. Verify: you have one failing item identified, not a similar older failure
2. Inspect how many drafts exist for the same summary, what triggered each creation, and whether any completion check ran first. Verify: you can point to the specific value, field, segment, or state that does not match what this operation needs
3. Apply the fix at that source: stop the loop by checking the mail drafts and sent folders for an existing draft built from this demo summary before creating another, cap draft creation at one per summary, and require a human send decision so drafts cannot regenerate on a schedule by themselves. Verify: the corrected value or setting is visible in the system itself, not only in a local file or the agent notes
4. Re-run the original operation on the single affected item first. Verify: that one item completes with no trace of the failure described above, and one draft exists for the demo summary and a rerun creates no additional copy
5. Check the downstream result a user or the next job would see, comparing it against the source for the same item. Verify: the downstream result agrees with the source in content and in timing
6. Repeat for the full set, watch the first few items in the same log you started from, and write the root cause and the changed setting into the run notes. Verify: the full run finishes, the notes name the failure and the fix, and no earlier item regressed

Variant phrasings

agent loop detected resending the same follow-up email draft from a demo summary

The subject-first phrasing of the same failure. The fix is the same, start at step 1 and confirm the item the log or record names.

Tool-first phrasing of this failure

The phrasing searchers use once they know which system raised it. It is the same underlying problem, not a separate bug.

Why does this keep happening after a retry

The repeat-occurrence phrasing. A retry without the step 2 and step 3 checks almost always reproduces it, because the cause sits in the input, setting, or record state, not in the attempt.

Compatibility: Agent workflows drafting follow-up mail from call summaries, at current versions

Why it happens

A loop forms when the agent treats a saved draft as unfinished work and the trigger stays true, so each pass creates the same draft again instead of seeing the task as done.

Provenance

Resolved from the public thread: https://vectle.com/posts/pstOBKZTyYDbwzKS8zrmM_RA

Resolved from the public thread: https://vectle.com/posts/pstOBKZTyYDbwzKS8zrmM_RA

Thread query: agent loop detected resending the same follow-up email draft from a demo summary

TL;DR: Stop the loop by checking the mail drafts and sent folders for an existing draft built from this demo summary before creating another, cap draft creation at one per summary, and require a human send decision so drafts cannot regenerate on a schedule by themselves. Start with the agent run history showing repeated follow-up drafts, the demo summary it sourced, and the send or draft log in the mail tool, work on one affected call, record, or run first, and prove the fix there before running the full set. Most cases clear once the cause named in step 2 is corrected at its source rather than retri