# Acceptance Test Report — FEATURE-050-D

| Test Type | structured-review |
|-----------|-------------------|
| Date | 2026-03-17 |
| Tester | Nova ☄️ (retroactive) |

## Results Summary

| Total ACs | Pass | Fail | N/A |
|-----------|------|------|-----|
| 21 | 21 | 0 | 0 |

## Artifacts Reviewed

| Artifact | Path |
|----------|------|
| Specification | `x-ipe-docs/requirements/EPIC-050/FEATURE-050-D/specification.md` |
| SKILL.md | `.github/skills/x-ipe-task-based-application-knowledge-extractor/SKILL.md` |
| Execution Procedures | `references/execution-procedures.md` (Phase 4 Step 4.1) |
| Checkpoint & Error Heuristics | `references/checkpoint-error-heuristics.md` |
| Handoff Protocol | `references/handoff-protocol.md` |

## Detailed Results

### Group 1: Checkpoint Persistence

| AC ID | Criterion | Result | Evidence |
|-------|-----------|--------|----------|
| AC-050D-01 | GIVEN extraction in progress WHEN section completes THEN manifest updated with status, content_file, updated_at before next section | **PASS** | execution-procedures.md Phase 2 Step 2.1 Action §8: "Update manifest.yaml with section result (status, content_file, files_read, warnings, timestamps)". checkpoint-error-heuristics.md §3 "When to Save": "After each section extraction". SKILL.md Phase 4 Action §3: "Persist manifest after every section". |
| AC-050D-02 | GIVEN manifest exists WHEN read after section THEN schema_version "1.0" and completed sections have valid status/content_file | **PASS** | handoff-protocol.md manifest template declares `schema_version: "1.0"`. checkpoint-error-heuristics.md §3 section schema lists status enum including "accepted", "needs-more-info" with `content_file` field. execution-procedures.md Phase 1 Step 1.4 writes manifest from template. |
| AC-050D-03 | GIVEN extraction running WHEN Phase 4 followed THEN checkpoint saves at section-level granularity | **PASS** | checkpoint-error-heuristics.md §3 "When to Save": explicitly lists "After each section extraction" and "After each section validation". §9 Integration Points: "Step 2.1 (After each section) — Checkpoint save: persist manifest". Not phase-boundary-only. |
| AC-050D-04 | GIVEN checkpoint saved WHEN writing manifest THEN session status reflects current state | **PASS** | checkpoint-error-heuristics.md §3 "What to Save" overall manifest: `status: "initialized | extracting | validating | paused | complete | error"`. handoff-protocol.md manifest template confirms same enum. §1 State Machine enforces valid values. |

### Group 2: Pause & Resume

| AC ID | Criterion | Result | Evidence |
|-------|-----------|--------|----------|
| AC-050D-05 | GIVEN extraction in progress WHEN pause triggered THEN status → "paused", in-progress sections marked with last known state | **PASS** | checkpoint-error-heuristics.md §1 Valid Transitions: extracting→paused, validating→paused. §3 "When to Save": "On pause: set overall status → 'paused'". §9: "User interruption (any point) → Pause: status → 'paused'". Section-level status preserved per §3 schema (each section keeps its current status). |
| AC-050D-06 | GIVEN paused checkpoint exists WHEN invoked with same target THEN auto-detects most recent by scanning session-{timestamp} sorted descending | **PASS** | checkpoint-error-heuristics.md §2 Resume Algorithm: Step 1 SCAN: glob `session-*/manifest.yaml`; Step 2 FILTER: status IN (paused, extracting) AND target matches; Step 3 SORT: by timestamp desc; Step 4 SELECT: first (most recent). execution-procedures.md Phase 4 CONTEXT confirms same logic. |
| AC-050D-07 | GIVEN paused checkpoint detected WHEN resuming THEN only non-completed sections extracted; accepted sections skipped | **PASS** | checkpoint-error-heuristics.md §2 Resume Algorithm Step 6b: "Identify sections with status 'accepted' → SKIP"; Step 6c: "Identify sections with status 'needs-more-info'|'extracted'|'error' → PROCESS". execution-procedures.md Phase 4 VERIFY: "resumed sessions skip accepted sections". |
| AC-050D-08 | GIVEN multiple checkpoint sessions WHEN auto-detecting THEN most recent with status "paused" or "extracting" selected | **PASS** | checkpoint-error-heuristics.md §2 Resume Algorithm: FILTER on status IN ("paused", "extracting"), SORT descending, SELECT first. Handles multiple sessions by design. |
| AC-050D-09 | GIVEN checkpoint resumed WHEN extraction continues THEN updated_at refreshed and resume entry added to event_log | **PASS** | checkpoint-error-heuristics.md §2 Resume Algorithm Step 6e: "Add event_log entry: {event: 'resumed', timestamp: ISO8601, resumed_from: previous_status}"; Step 6f: "Update manifest.updated_at". SKILL.md Phase 4 Action §2: "on resume: add event_log entry, refresh updated_at". |

### Group 3: Error Classification & Retry

| AC ID | Criterion | Result | Evidence |
|-------|-----------|--------|----------|
| AC-050D-10 | GIVEN transient error WHEN caught THEN retries immediately up to 2 times (3 total) | **PASS** | checkpoint-error-heuristics.md §5: "Method: Immediate retry", "Max retries: 2 (3 total attempts)". Retry Flow pseudocode shows `WHILE attempt <= max_retries` loop with immediate retry on transient error. execution-procedures.md Phase 4 DECISION: "Transient error → immediate retry, max 2 retries (3 total)". |
| AC-050D-11 | GIVEN all retries exhausted WHEN error persists THEN section marked "error" and logged to error_log[] | **PASS** | checkpoint-error-heuristics.md §5 Retry Flow: "IF attempt > max_retries: mark section 'error', append error_log[] entry (retry_count = max_retries - 1), continue to next section". execution-procedures.md Phase 4 DECISION: "Exhausted retries → mark 'error', log to error_log[]". |
| AC-050D-12 | GIVEN permanent error WHEN caught THEN no retries, section immediately marked "error" | **PASS** | checkpoint-error-heuristics.md §4 Permanent Errors table: all marked ❌ (not retryable). §5 Retry Flow: "ON PERMANENT ERROR: mark section 'error', append error_log[] entry (retry_count = 0), continue to next section". |
| AC-050D-13 | GIVEN error logged WHEN reading error_log[] THEN entry contains section_id, error_type, message, retry_count, timestamp | **PASS** | checkpoint-error-heuristics.md §6 error_log[] Schema: `section_id: int`, `error_type: "transient | permanent"`, `message: "string"`, `retry_count: int`, `timestamp: "ISO 8601"`. Example YAML entries demonstrate all 5 fields. SKILL.md Phase 4 Action §4 lists same fields. |
| AC-050D-14 | GIVEN section fails WHEN other sections remain THEN extraction continues (fail-open per section) | **PASS** | checkpoint-error-heuristics.md §5 Retry Flow: both exhausted-retry and permanent-error branches end with "continue to next section". execution-procedures.md Phase 4 DECISION: "continue next section (fail-open)". §8 Edge Cases: "All sections fail → Session status → 'error', error_log contains all entries" (confirms per-section failure, not per-session abort). |

### Group 4: Error Recovery Decisions

| AC ID | Criterion | Result | Evidence |
|-------|-----------|--------|----------|
| AC-050D-15 | GIVEN DAO mode WHEN permanent error THEN agent autonomously decides recovery without human intervention | **PASS** | checkpoint-error-heuristics.md §7 DAO Mode: "The agent autonomously decides recovery without human intervention" with 3 options: skip section (default), adjust parameters, halt session. Decision criteria documented: optional → skip, core → adjust, multiple core failures → halt. |
| AC-050D-16 | GIVEN manual mode WHEN permanent error THEN agent surfaces error to human with options | **PASS** | checkpoint-error-heuristics.md §7 Manual Mode: "Surface the error to the human with these options: 1. Skip this section, 2. Provide alternative source, 3. Abort extraction". execution-procedures.md Phase 4 DECISION: "manual mode → surface options to human". |
| AC-050D-17 | GIVEN recovery decision "skip" WHEN applied THEN section status → "skipped" and extraction proceeds | **PASS** | checkpoint-error-heuristics.md §7 DAO Mode option 1: "Mark section 'skipped', proceed to next". §3 section status enum includes "skipped". Both DAO and manual mode offer skip as an option. |

### Group 5: Checkpoint Corruption

| AC ID | Criterion | Result | Evidence |
|-------|-----------|--------|----------|
| AC-050D-18 | GIVEN manifest exists WHEN fails YAML parsing or schema_version ≠ "1.0" THEN classified as corrupted | **PASS** | checkpoint-error-heuristics.md §2 Resume Algorithm Step 5a: "Parse YAML — if parse fails → CORRUPTED"; Step 5b: "Check schema_version == '1.0' — if mismatch → CORRUPTED". §4 Permanent Errors table includes "Schema mismatch — Checkpoint schema_version ≠ '1.0'" as permanent error. |
| AC-050D-19 | GIVEN corrupted checkpoint detected WHEN attempting resume THEN starts fresh session and logs warning | **PASS** | checkpoint-error-heuristics.md §2 Resume Algorithm Step 5c: "Log warning: 'Corrupted checkpoint at {path}, starting fresh session'" → "Fall through to normal Phase 1 (start fresh)". SKILL.md Phase 4 constraints: "Corrupted checkpoints (YAML parse fail) → fresh start with warning". execution-procedures.md Phase 4 VERIFY: "Corrupted checkpoints → fresh start with warning logged". |

### Group 6: Manifest State Machine

| AC ID | Criterion | Result | Evidence |
|-------|-----------|--------|----------|
| AC-050D-20 | GIVEN manifest status WHEN tracking transitions THEN only valid transitions are: initialized→extracting, extracting→validating/paused, validating→paused, paused→extracting/validating, any→error/complete | **PASS** | checkpoint-error-heuristics.md §1 Valid Transitions table lists all specified transitions with triggers. ASCII state diagram confirms flow. execution-procedures.md Phase 4 ACTION §3 enumerates: "initialized→extracting, extracting→validating\|paused, validating→paused, paused→extracting\|validating, any→error\|complete". Terminal states (error, complete) have no outbound transitions per BR-4. |
| AC-050D-21 | GIVEN SKILL.md Phase 4 WHEN defining state machine THEN invalid transitions explicitly rejected with logged warning | **PASS** | checkpoint-error-heuristics.md §1 Invalid Transition Handling: "1. Log warning: 'Invalid state transition attempted: {from} → {to}, rejected'. 2. Keep current status unchanged. 3. Continue execution (do not crash)." SKILL.md Phase 4 constraints: "BLOCKING: Invalid state transitions rejected with warning". |

## Notes

- The `.checkpoint/` path in handoff-protocol.md (v1.0, FEATURE-050-A) uses `.checkpoint/` while SKILL.md v1.5.1 uses `.x-ipe-checkpoint/`. The rename is consistent across the SKILL.md and execution-procedures.md; handoff-protocol.md predates the rename. This does not affect AC compliance — the behavior is identical.
- All 21 ACs are verified against implementation artifacts (SKILL.md, execution-procedures.md, checkpoint-error-heuristics.md). No AC relies solely on the spec — each has traceable evidence in the skill code.
- This report is retroactive: the implementation was verified as complete during the original feature closing, but no formal report file was generated at that time.
