---
phase: 04-analysis-orchestration
plan: 04
subsystem: pipeline
tags: [pydantic, pipeline, orchestration, schemas]

# Dependency graph
requires:
  - phase: 04-analysis-orchestration
    provides: BaseProcessor, LinkParser, WorkflowStateManager, processors
provides:
  - PipelineInput/Output/Config schemas
  - Pipeline class with processor orchestration
  - URL parsing and content directory creation
affects: [05-future-pipeline-run]

# Tech tracking
tech-stack:
  added: []
  patterns: [TDD, sequential execution, state persistence]

key-files:
  created:
    - kb_pipeline/pipeline.py
    - tests/test_pipeline/test_pipeline.py
  modified:
    - kb_pipeline/schemas.py

key-decisions:
  - "Pipeline uses sequential execution for simplicity and debuggability"
  - "Processor STEP_NAME validation ensures only configured steps run"
  - "Content directory naming: {platform}_{content_id}"

patterns-established:
  - "TDD: Write failing tests first, then implement"
  - "Processor registry: Dict[str, BaseProcessor] for O(1) lookup"

requirements-completed: [MNT-01]

# Metrics
duration: 3min
completed: 2026-03-13
---

# Phase 04 Plan 04: Pipeline Schemas and Class Summary

**Pipeline schemas (PipelineInput/Output/Config) and Pipeline class foundation for processor orchestration**

## Performance

- **Duration:** 3 min
- **Started:** 2026-03-13T15:35:50Z
- **Completed:** 2026-03-13T15:38:24Z
- **Tasks:** 2
- **Files modified:** 3

## Accomplishments
- PipelineInput/Output/Config schemas defined in schemas.py
- Pipeline class with processor initialization and validation
- URL parsing creates correct content directory
- All 19 tests passing

## Task Commits

Each task was committed atomically:

1. **Task 1: Define Pipeline Schemas** - `5d4cb93` (test) + `789d1f4` (feat)
2. **Task 2: Create Pipeline class** - `0dfb51e` (feat)

**Plan metadata:** (pending final commit)

_Note: TDD tasks may have multiple commits (test -> feat -> refactor)_

## Files Created/Modified
- `kb_pipeline/schemas.py` - Added PipelineInput, PipelineOutput, PipelineConfig schemas
- `kb_pipeline/pipeline.py` - Pipeline class with processor initialization
- `tests/test_pipeline/test_pipeline.py` - Schema and Pipeline class tests (19 tests)

## Decisions Made
- Sequential execution pattern for simplicity and debuggability
- Processor STEP_NAME must match config.steps for validation
- Content directory naming convention: `{platform}_{content_id}`

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- Pipeline foundation ready for run() method implementation
- Can integrate with existing processors (parse, download, asr, analyze)

## Self-Check: PASSED
- All files verified to exist
- All commits verified in git history

---
*Phase: 04-analysis-orchestration*
*Completed: 2026-03-13*