A build someone else can repeat
Start with the source version that matches the delivered software. Record runtime and dependency versions, installation commands, configuration names and deployment order. Try the instructions in a clean environment; that exposes files or settings that existed only on the original developer’s machine.
The decisions behind the code
A short map of application functions, data stores and external connections helps a maintainer find the relevant code. Include the schema and field mappings, with the system responsible for each record.
Explain constraints that would be easy to mistake for defects: a delayed import, a vendor limit or a compatibility requirement. Keep the relevant checks beside those decisions so a later change can be reviewed against them.
When recovery applies
A recovery command is useful only when the operator knows when it applies. State the failure it addresses and the condition it should restore. Check that the instructions answer these questions:
- Which log or alert identifies this failure?
- What data may already have changed?
- Which actions are safe to repeat?
- Which backup or software version is required?
- How is recovery confirmed, and which steps remain untested?
Access that survives the handoff
Name the owners of hosting, domains, repositories and external service accounts. Record how an authorized maintainer obtains access and who renews credentials or subscriptions. Keep secret values in the appropriate service; the document should identify where they are managed.
Work still open
Leave a record of known limitations and outstanding changes with the source. Agree who operates the application after delivery and how further work is requested. A handoff can document those responsibilities even when ongoing maintenance is arranged separately.