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When the brief is fixed but engineering context moves
PRDs are alignment inputs. Living engineering decisions are what keep the work true.
A PRD or initiative brief is often the right starting artefact. Product writes intent. Engineering starts designing. Within a week, a constraint surfaces in a design review. A Slack thread changes the approach. A decision in standup contradicts paragraph four. The brief is still open in three tabs, but the living engineering context has already moved on.
The brief was accurate on the day it was written. The solution context was not meant to freeze on that day.
Why engineering context drifts from the brief
- Solution design does not stop at handoff. Systems constraints, ownership, and incident lessons keep arriving.
- Decisions happen in threads, reviews, and tickets, not only in the doc that stated the original intent.
- Updating a long static spec feels like rework, so teams patch around it with side conversations.
- Nobody owns keeping the engineering rationale current once implementation has started.
What teams lose when only the static doc remains
The brief still says
- Scope from the planning session that kicked off the work
- Assumptions made before the architecture review
- Requirements that predate a real systems constraint
- Open questions that were answered elsewhere
Engineering actually knows
- What changed in Slack after the brief was shared
- Which trade-offs were made in design review
- Why the first milestone was scoped down
- Which services, owners, and runbooks are in play
The fix is not "write better PRDs"
More detail in the brief does not solve decay. It adds surface area that can contradict reality. Prodigent is not a PRD authoring tool. A PRD or initiative brief remains a useful input. What needs to stay alive is the engineering decision and solution context that stays aligned to that input as work evolves.
What living engineering context looks like
- 1
Treat the PRD as alignment, not the whole system of record
Import a PRD or brief as initiative context. Use it to stay aligned to the brief while engineers design against organisational knowledge.
- 2
Capture decisions where they happen
Log choices with constraints and alternatives, not as a post-hoc summary buried in a doc footer.
- 3
Keep solution design connected to systems and people
Link the work to components, ownership, prior decisions, and incident lessons so updates have a clear place to land.
- 4
Make drift visible
When a decision changes the approach relative to the brief, surface the gap instead of letting silent divergence become the default.
Keep solution context connected
Prodigent captures decisions, constraints, and organisational knowledge as engineering work evolves, so solution designs stay aligned to a PRD or initiative brief without freezing on day one.
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