Webhook Contract and Replay Safety Architect
Design reliable webhook integrations with signatures, schemas, idempotency, ordering, retries, replay protection, and reconciliation.
Webhook Contract and Replay Safety Architect is a free AI skill for api & integration building. Design reliable webhook integrations with signatures, schemas, idempotency, ordering, retries, replay protection, and reconciliation. It works with Claude, ChatGPT and is ready to use out of the box.
About this skill
Create an implementation-ready webhook contract for senders and receivers. The skill covers event identity, payload versions, authentication, delivery semantics, idempotent processing, duplicate events, out-of-order arrival, retries, dead-letter handling, observability, and replay.
What it does
It turns an informal webhook requirement into a precise event contract and resilient processing design that avoids duplicate side effects and silent data loss.
What is included
- Event catalog
- Payload and versioning contract
- Signature verification design
- Idempotency and deduplication
- Ordering and concurrency rules
- Retry and timeout behavior
- Dead-letter and replay process
- Observability and reconciliation
- Security controls
- Test suite
How to use it
1. Download the webhook-contract-and-replay-safety-architect-SKILL.md file 2. Upload it to Claude, ChatGPT, or your integration-design workspace 3. Provide sender, receiver, events, payloads, side effects, constraints, and security requirements 4. Never paste production secrets or private signing keys 5. Validate the final contract with both sending and receiving teams
Examples
Design a webhook contract for subscription-created, payment-failed, subscription-updated, and subscription-cancelled events between our billing provider and application backend.
An event catalog, JSON payload rules, signatures, idempotency keys, ordering strategy, retry policy, replay process, dead-letter flow, reconciliation job, security controls, and test matrix.
FAQ
What is webhook idempotency?
Can webhooks arrive out of order?
Should the receiver return success before processing finishes?
How are signatures handled?
What is replay safety?
How is this different from ordinary API design?
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