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weatherreporter/docs/internal/briefing.md

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# Briefing Internals
This document describes the implemented briefing package boundary.
## Purpose
`internal/briefing` builds structured report-specific briefing packages from
forecast summaries and report metadata. The package currently implements the
Daily briefing only.
## Inputs and Outputs
Inputs:
- resolved report definition and valid period
- forecast bundle
- derived daily forecast summary
- configured units and timezone
Output:
- `briefing.Package` JSON containing common metadata and Daily briefing content
## Boundaries
- Briefings are structured weather facts and context for later prompt input.
- This package does not fetch weather data, compare prior snapshots, build
`scriptorium` data packages, or render final report prose.
## Behavior
- Common metadata includes schema version, RunID, report ID, variant, prompt ID,
generation time, units, timezone, valid period, source location, source
provenance, hashes, and source warnings.
- Daily content includes bottom-line inputs, daypart summaries, relevant alerts,
outdoor window inputs, narrative periods, discussion context, and weather
story context when available.
- Briefing JSON is written atomically by `briefing.Save`.
## Failure Behavior
- Daily briefing construction requires a Daily report definition and a derived
daily forecast summary.
- Save failures include path and operation context.
## Tests
Inspect:
- `internal/briefing/daily_test.go`
- `internal/app/app_test.go`
- `internal/cli/root_test.go`
## Invariants
- Weather facts come from normalized and derived source data.
- Briefing output remains JSON-inspectable.
- LLM prompt input packaging and `scriptorium` execution remain outside this
boundary.