Define What Each Handoff Carries

Write the six things every boundary crossing carries, and derive routing rather than maintaining it.

See the situation

Start with the situation below. Next, we will work through an example together before you try the activity.

Samir · Workflow operator

The case

A handoff contract with one thing missing

A handoff packet needs identity, payload, acknowledgement, and an idempotency rule for repeated delivery.

Correlation key: Present
Status lifecycle: Present
Retry category: Present
Actor and audit result: Both present
What happened on the day the queue replayed: Everything ran twice

Your task

Find the missing contract item. Choose how the receiver handles a duplicate, then check the effect count.

Need a little guidance?

You’re done when: Replaying the packet cannot create a second business action.

A handoff needs enough identity to survive retries and debugging.

Need a reminder? Reopen the worked example

Watch one example first

Operation FT-12 is delivered twice. The receiver recognizes the same ID, applies one business effect, and acknowledges both deliveries. That is the repeat-safety property called idempotency.

Why this follows from the evidence

Carry identity, payload, authority context, and acknowledgment across the boundary. A repeated delivery and a new business request are not interchangeable.

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Case evidence

A handoff contract with one thing missing

Correlation key: Present
Status lifecycle: Present
Retry category: Present
Actor and audit result: Both present
What happened on the day the queue replayed: Everything ran twice

The contract above has five of the six elements and looked complete for months. Find the missing one, then decide where the destination comes from.

Complete the handoff contract, then inspect a duplicate delivery

The contract has six elements. Five are supplied below; the replayed request reveals the missing one.

correlation key: present in the sample contract
status lifecycle: present in the sample contract
retry category: present in the sample contract
actor: present in the sample contract
audit result: present in the sample contract

Which contract element is missing?When request FT-204 arrives twice

Local duplicate-delivery simulation · operation FT-204

Delivery 1: received and acknowledged.
Delivery 2: choose a rule to see the receiver behavior.

Business effects in this example: — · Acknowledgements: —

Where should the sender identity come from?

Restoring this case draft…

Optional: compare the original decision choices

The case workbench above records completion. These choices are optional review and do not create the activity receipt on their own.

Work the case · 0 of 2 sections drafted

Write the contract

Compare these alternatives one section at a time. Check a choice to see its consequence; the draft summary below keeps the proposed changes together.

Step 1 of 2

Which element is missing from the contract above?

The correlation key.The idempotency rule: what happens when the same request arrives twice.The retry category.

This is a proposed draft until the chapter check runs. Selecting a choice alone does not complete the chapter.

3c · Proposed

System handoff draft

System handoff draft · current draftCompare the original state with the proposed change. This preview does not change live records.

System handoff draft · current draft
Item	Before	Proposed	Why
Which element is missing from the contract above?	No saved change in this exercise draft	Not drafted yet	Choose a proposal to see what it would add to the draft.
Outbound mail has to send from somebody. Where does that come from?	No saved change in this exercise draft	Not drafted yet	Choose a proposal to see what it would add to the draft.

Which element is missing from the contract above?: BeforeNo saved change in this exercise draft; ProposedNot drafted yet; WhyChoose a proposal to see what it would add to the draft.
Outbound mail has to send from somebody. Where does that come from?: BeforeNo saved change in this exercise draft; ProposedNot drafted yet; WhyChoose a proposal to see what it would add to the draft.

A choice appears here as a proposal, not as evidence that a live system changed.

Your place saves as you go.

Chapter 2 of 80 complete