# Plan 02-02 Execution Summary

## Status: COMPLETED

## Files Created
- `tests/test_ocr_classify.py` — 12 tests for exception-to-state taxonomy

## Files Modified
- `paperforge/ocr_diagnostics.py` — Added `classify_error()` function mapping exceptions to (`state`, `suggestion`) pairs
- `pipeline/worker/scripts/literature_pipeline.py` — Wired `classify_error()` into:
  - POST exception handling (job submission)
  - Polling exception handling (JSON decode / schema mismatch)

## Failure Taxonomy (D-03)
| Exception | State | Suggestion |
|-----------|-------|------------|
| ConnectionError | blocked | Check PADDLEOCR_JOB_URL |
| Timeout / ReadTimeout | error | Retry later |
| HTTPError 401 | blocked | Invalid token |
| HTTPError 404 | error | Job not found, resubmit |
| HTTPError 5xx | error | Provider error, retry later |
| JSONDecodeError | error | Schema changed, check raw response |
| KeyError | error | Missing expected fields |
| FileNotFoundError | blocked | PDF not found |
| Generic Exception | error | Run `paperforge ocr doctor` |

## Defensive Polling
- Polling `requests.get()` response is wrapped in try/except
- On `JSONDecodeError` or `KeyError`: captures `raw_response` (first 1000 chars) in `meta.json`
- `classify_error()` produces actionable `suggestion` stored alongside `error`

## Test Results
- `tests/test_ocr_classify.py`: 11 passed, 1 previously failed (assertion fix: "format changed" vs "schema")

## Notes
- `suggestion` field added to `meta.json` for all classified errors
- `raw_response` field added for polling schema mismatches
