---
phase: 11-manual-ruff-cli-mypy
plan: 03
subsystem: llm
tags: [mypy, type-annotations, dataclass, refactor]

requires:
  - phase: 10-manual-ruff-leaf-to-hub
    provides: zero E501 violations outside cli.py

provides:
  - Atom dataclass promoted to module level in chunked_processor.py
  - Full type annotations on finalize_atom, get_chunk_text, chain_lines
  - Zero mypy errors in llm/chunked_processor.py

affects: [11-manual-ruff-cli-mypy]

tech-stack:
  added: []
  patterns:
    - "Nested dataclasses blocking mypy analysis must be promoted to module level"
    - "Nested functions inside generator functions require explicit type signatures for mypy --strict"

key-files:
  created: []
  modified:
    - src/corpus_analyzer/llm/chunked_processor.py

key-decisions:
  - "chain_lines local res variable typed as list[str] to satisfy mypy inference"

patterns-established:
  - "Promote nested @dataclass to module level with PEP 257 docstring before the function that uses it"
  - "Annotate nested closures with full signatures matching actual parameter names from source"

requirements-completed: [MYPY-02]

duration: 5min
completed: 2026-02-24
---

# Phase 11 Plan 03: chunked_processor.py Mypy-Clean Summary

**Atom dataclass promoted to module level and all three nested functions fully annotated — zero mypy errors in chunked_processor.py**

## Performance

- **Duration:** ~5 min
- **Started:** 2026-02-24T10:47:45Z
- **Completed:** 2026-02-24T10:52:30Z
- **Tasks:** 2
- **Files modified:** 1

## Accomplishments
- Moved `Atom` dataclass from inside `split_on_headings` to module level with PEP 257 docstring
- Added full type signatures to `finalize_atom` (str | None, int, bool -> None)
- Added full type signatures to `get_chunk_text` (list[Atom] -> str) and `chain_lines` (list[Atom] -> list[str])
- Zero mypy errors in `chunked_processor.py`; all 281 tests pass

## Task Commits

Each task was committed atomically:

1. **Task 1: Promote Atom dataclass to module level** - `fad7d65` (refactor)
2. **Task 2: Annotate nested functions finalize_atom, get_chunk_text, chain_lines** - `46ed43e` (refactor)

**Plan metadata:** (docs commit — see below)

## Files Created/Modified
- `src/corpus_analyzer/llm/chunked_processor.py` - Atom promoted to module level; finalize_atom, get_chunk_text, chain_lines annotated

## Decisions Made
- Added explicit `res: list[str] = []` type annotation in `chain_lines` body so mypy can infer element type correctly without inference from `extend`.

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None.

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- MYPY-02 requirement satisfied; chunked_processor.py is mypy-clean
- Phase 11 can continue with remaining mypy targets (rewriter.py and other files)

---
*Phase: 11-manual-ruff-cli-mypy*
*Completed: 2026-02-24*
