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HHarborline
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1 needs you1 running$2.74today

Duplicate credit fix

5 steps10 agents$2.74Spend cap $12.00

Starts in payments-api / hl/fix-duplicate-credit
Now
5TesterReplay one event three timesHaiku 4.5
4.2DebuggerPick the retry limitNeeds your answer in step 4.2Needs youSonnet 5.5Medium6m$0.04Answer
4.1ReviewerCheck the attempt counter against the specStep 4.1 failedGPT-5.6 Terra2m$0.03
4ImplementerRecord the attempts on each delivery in notify-relayKimi K3Low46m$0.23
3ImplementerDedupe on the event id in payments-apiGPT-5.6 SolMedium$0.94
2PlannerAgree where the dedupe belongsOpus 5.5High$1.28
1.3ScoutCheck the retry notices in notify-relayComposer 2.5$0.01
1.2ScoutRead the webhook handler in payments-apiGPT-5.6 Terra$0.06
1.1ScoutRead the posting path in ledger-coreHaiku 4.5$0.02
1ScoutTrace where a retried webhook postsComposer 2.5$0.13

Providers, limits and cost

The same task, run two ways

A bug fix doesn't need one agent that remembers everything. Give each step a fresh one and pay only for what it reads.

One long conversation

One heavy model rereads the whole history at every step.

Read the webhook handlerRead$0.40
Plan the dedupePlan$1.30
Write the fixWrite$2.70
Fix the testsTests$4.60
Review the diffReview$7.00
Answer the reviewAnswer$9.80

Total $9.80

With Goodboy

A fresh agent per step, on the model that fits it.

Scouts$0.13
PlanOpus 5.5 High$1.41
ImplementGPT 5.6 Sol$2.35
TestHaiku 4.5$2.56
ReviewGPT 5.6 Terra$2.85
ResolveSonnet 5.5$3.07

Total $3.07

Example run on the Harborline webhook fix.See more about cost

Shared context

Stop re-explaining yourself

Goals and decisions live inside the task. The next agent reads them instead of asking you.

AgentsImplementer3.1
Sent byWorkflow step 3 of 507:55

Make a redelivered webhook credit the account once, keyed on the processor event id.

Why: D3 moved the dedupe inside the transaction, so the handler check from D1 is gone.Decision 7

Moving the event id insert into the credit transaction. A unique violation on (account_id, event_id) now means the event already landed, so the handler answers 200 and posts nothing.

Operations33 edit
What should Implementer build?
Ask firstGPT-5.6 Sol · Medium
ContextUpdated 1h ago
GoalDecisions 3Summary
Active 3
4
Backfill runs read only for its first pass
You · 1d
5
Show the banner after the first failed retryReplaced by 7
Plan · turn 9 · 2h
6
Keep the retry state store on payments-api, so notify-relay stays a read only view
Design the idempotency key and backfill plan · turn 11 · 1h
7
Show the stuck-delivery banner after the third failed retry, not the firstAdded by PlannerRead by Implementer
Agree where the dedupe belongs · turn 14 · just now

Decisions live in the task, not in a chat.

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InboxPulls from
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All items7 of 26
Today5
CORE-API-7DuplicateChargeError on order capturepayments-apiUnresolved8m ago
CAS-231Refunds on split payments keep the second chargeCAS PaymentsIn progress25m ago
#187Admin sessions table loads every row at oncepayments-apiOpen50m ago
#paymentsWebhook retries pile up since the deploy?3 repliesOpen2h ago
FIN-91Reconcile the settlement export before closeFIN FinanceIn review3h ago
Yesterday2
#184Add an idempotency key to the refund callpayments-apiMerged1d ago
CAS-228Backfill refund ledger entriesCAS PaymentsDone1d ago

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