The context handoff between planning, implementation, and review

The handoff is an engineering boundary.

A feature can have a thoughtful plan, a focused implementation, and a diligent review while still losing an important constraint between those stages. The plan lived in one conversation, the code changed in another, and the reviewer saw a patch without the reason a behavior had to remain true.

Treat that transition as a boundary with inputs and responsibilities. It does not need a new ceremony for every change. It needs enough continuity for the next person or agent to know what the task is trying to accomplish, what changed, and what is still unknown.

Let one change record evolve.

Begin with the problem, applicable constraints, source links, and open decisions. During implementation, add choices that materially affect the contract. During verification, record what was actually checked and the limits of that check. Avoid maintaining three polished summaries that disagree.

Follow a fictional order change through the stages.

The plan says retries must recover one accepted order per request ID. Implementation discovers that the client creates the identifier inside the retry loop. The change moves that responsibility outside the loop, but server-side overlap handling remains a separate dependency.

The handoff to review should preserve both facts: the client fix is implemented; the service-level concurrency behavior still needs inspection. A summary saying “idempotent retries added” would combine an implemented change and an unverified dependency into a broader outcome than the evidence supports.

After tests run, record exactly what they exercise. The client test may prove stable identifiers across attempts. A service integration test may exercise overlapping requests. Neither automatically proves every caller’s retry policy or production behavior under failure. This is a useful boundary for the record to keep.

Assign maintenance to the stage that learns the fact.

A planning owner can establish a requirement but cannot truthfully mark a later check passed. The implementer should record a discovered deviation; the person running verification should record the observed result. The reviewer can identify a missing policy without becoming the owner of the product decision.

For a small team, these may be the same person at different moments. The distinction is still useful because it separates authority over a decision from evidence that an action happened.

Keep links to the authoritative issue, decision, or code. Copy only the small amount of reasoning needed for continuity. A second repository-wide knowledge system is unnecessary if the existing record and instruction mechanisms already make that understanding available.

Change record
Problem and scope:
Applicable decisions, sources, and dates:
Open questions and decision owner:
Implementation deviations and reason:
Review findings and unresolved areas:
Checks actually run and observed results:
Remaining limitations:
What the next task should recover:

Look for reconstruction in one workflow.

Choose one recent change and ask the planner, implementer, and reviewer where they had to ask for background that already existed. Was the source inaccessible, difficult to find, stale, ambiguous, or simply not supplied? Those causes call for different fixes.

Then try the compact record on a few comparable changes in one service. Track preparation effort, clarification, missed constraints, and review rework, along with the accepted outcome. Keep ordinary test and approval requirements. If maintaining the record becomes a parallel documentation project, narrow it to facts that change the next action.

Do not infer delivery improvement from a shorter review thread alone. The thread may be shorter because the work was simpler or because important questions were missed. Inspect what changed in the actual task.

Make the next stage informed, not overloaded.

The purpose of context continuity is to let the next stage use the reasoning already earned. A reviewer should not need the whole planning transcript, but should be able to recover the decision that changes the verdict. The next task should inherit a verified lesson without inheriting every stale status message.

That is a useful design test for a context engine and for an ordinary team workflow: can it preserve the small set of facts that changes what somebody should do next, with enough evidence to challenge them? Start at one handoff where the answer is currently no.