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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
resolved report metadata, forecast bundles, and derived forecast summaries.
Briefings are curated inputs for prompt data packages, not rendered report
prose.
## Inputs And Outputs
Inputs:
- resolved report definition, generation time, timezone, and valid period
- forecast bundle with source provenance and warnings
- derived daily or period summaries where required
- configured units, timezone, and descriptive location context
Outputs:
- `briefing.Package` with common metadata and one report-specific content
object for Daily, 3-Day, Weekend, or Storm Report
- optional `currentConditions` prompt context from normalized
`/conditions/current` data when available
- optional structured `weatherStory` context on report-specific briefing
objects when `/weatherstories/latest` is available
- optional JSON file written by `briefing.Save`
## Boundaries
- This package selects and shapes weather facts for prompts.
- It does not fetch weather data, compare prior snapshots, build
`data_package` files, invoke Scriptorium, or write workflow metadata.
## Config Fields Used
The package receives configured units and timezone from the app layer. Daypart
configuration is consumed by `internal/forecast` before briefing builders run.
Configured `location` values are prompt context only; Weather API
`sourceLocationId` and `sourceLocation` remain source provenance.
Current conditions are copied from the normalized `/conditions/current` bundle
source only; observation station and timestamp fields remain provenance.
## External Adapters Used
None directly.
## State Or Manifest Behavior
`briefing.Save` writes briefing JSON atomically. Managed workspace placement is
owned by `internal/state`.
## Skip And Resume Behavior
None. Builders either return a complete briefing package or an error.
## Failure Behavior
- Daily briefing construction requires a Daily report definition and derived
daily summary.
- 3-Day briefing construction requires a 3-Day report definition and at least
one derived summary.
- Weekend briefing construction requires a Weekend report definition and at
least one derived summary.
- Storm briefing construction requires a Storm Report definition and forecast
bundle.
- Save failures include path and operation context.
## Tests
Inspect:
- `internal/briefing/daily_test.go`
- `internal/briefing/three_day_test.go`
- `internal/briefing/weekend_test.go`
- `internal/briefing/storm_test.go`
- `internal/app/app_test.go`
## Invariants
- Briefings contain structured weather facts and source context.
- Common metadata includes RunID, report ID, prompt ID, valid period, source
provenance, source hashes, source warnings, and configured prompt location.
- LLM prompt input packaging and Scriptorium execution remain outside this
boundary.