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Auto-Recovery Loop Enhancement#54

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OBenner merged 17 commits intodevelopfrom
auto-claude/149-auto-recovery-loop-enhancement
Feb 18, 2026
Merged

Auto-Recovery Loop Enhancement#54
OBenner merged 17 commits intodevelopfrom
auto-claude/149-auto-recovery-loop-enhancement

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@OBenner OBenner commented Feb 13, 2026

Enhance the existing auto-recovery mechanism with smarter failure detection, automated rollback, retry with alternative strategies, and learning from failures. Includes exponential backoff, dead-letter queue for unrecoverable failures, and user notification thresholds.

Summary by CodeRabbit

Release Notes

  • New Features

    • Enhanced automatic failure recovery with intelligent retry strategies and exponential backoff delays
    • Automatic escalation of unrecoverable failures for human review
    • User notifications at configurable thresholds to track recovery progress
    • Recovery performance metrics to monitor most effective strategies
  • Tests

    • Added comprehensive end-to-end recovery workflow verification suite

OBenner and others added 14 commits February 13, 2026 13:03
- Added BACKOFF_BASE_DELAY, BACKOFF_MAX_DELAY, BACKOFF_MULTIPLIER constants
- Implemented calculate_backoff_delay() method with exponential growth formula
- Added wait_seconds field to RecoveryAction dataclass
- Integrated backoff delays into determine_recovery_action() for retry actions
- Prevents API rate limiting and thundering herd problems
- Follows pattern from apps/backend/runners/github/rate_limiter.py
…covery_action

- Add use_model_fallback field to RecoveryAction dataclass
- Enable model fallback after first retry attempt for VERIFICATION_FAILED failures
- Enable model fallback on retry for UNKNOWN errors
- Update docstring to document model fallback strategy (opus -> sonnet -> haiku)
- Prevents model-specific failures from causing unnecessary escalations
- Import DeadLetterQueue class
- Initialize DLQ in RecoveryManager.__init__
- Add add_failure_to_dlq() method with full context capture
- Add convenience methods: get_dlq_pending_failures(), get_dlq_statistics(), export_dlq_report()
- Integrate DLQ calls into determine_recovery_action() on escalation
- Automatically add failures to DLQ when escalation action is returned
- Captures attempt history, error messages, and recovery actions for manual review
Added strategy tracking statistics to RecoveryMetrics:
- get_strategy_statistics(): Returns usage count and success rate per strategy
- get_most_successful_strategy(): Identifies best-performing strategy
- Updated get_summary() to include strategy stats
- Updated format_summary() to display strategy performance

Tracks success rates for retry strategies (direct_retry, model_fallback, alternative_approach)
to help identify which recovery strategies are most effective.
- Added imports for FailureType, RecoveryAction, MODEL_FALLBACK_CHAIN, resolve_model_id
- Added tracking variables for pending recovery actions and model fallback
- Implemented pre-session recovery action handling (exponential backoff, rollback)
- Replaced simple stuck-subtask logic with enhanced recovery system
- Integrated smart failure classification and recovery action determination
- Added support for model fallback when recommended by recovery strategy
- Added recovery strategy guidance injection into prompts
- Integrated notification manager for threshold-based user notifications
- Handles retry, skip, escalate, rollback, and continue recovery actions
- Records recovery notifications vs silent failures for metrics

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Integrated enhanced recovery system into QA fixer agent:
- Added support for exponential backoff with configurable wait times
- Integrated model fallback strategy (opus -> sonnet -> haiku)
- Added retry strategy guidance for alternative approaches
- Implemented notification thresholds to reduce noise
- Added dead-letter queue integration for unrecoverable failures
- Smart recovery actions: retry/skip/escalate/rollback/continue
- Backward compatible with default model parameter

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Created comprehensive end-to-end verification test suite for the auto-recovery loop system.

Test Results (9/9 tests passed):
1. ✅ Failure Classification - Error pattern database correctly classifies 5 failure types
2. ✅ Exponential Backoff - Verified exponential progression (0s→2s→4s→8s→16s→32s→60s)
3. ✅ Retry Strategy Selection - Verified progressive strategies (direct→fallback→alternative)
4. ✅ Recovery Action Determination - Verified correct actions, wait times, fallback flags
5. ✅ Dead-Letter Queue - Verified unrecoverable failures captured for manual review
6. ✅ Notification Thresholds - Verified silent retries below threshold, notify at threshold
7. ✅ Full Recovery Loop - Verified complete loop with progressive strategies
8. ✅ UNKNOWN Failure Escalation - Verified UNKNOWN errors escalate to DLQ
9. ✅ is_recoverable() Method - Verified correct recoverability distinction

Recovery Flows Verified:
- VERIFICATION_FAILED: direct_retry → model_fallback → alternative → skip (3 attempts)
- UNKNOWN: direct_retry → model_fallback_alternative → escalate to DLQ (2 attempts)
- BROKEN_BUILD: rollback to last good commit → escalate if no commit
- CIRCULAR_FIX: skip immediately (no retry)
- CONTEXT_EXHAUSTED: continue in next session

All acceptance criteria met:
✅ Smart failure detection distinguishes recoverable vs unrecoverable errors
✅ Automated rollback to last working state on critical failures
✅ Retry with alternative strategies (different model, different approach)
✅ Exponential backoff prevents API rate limiting
✅ Dead-letter queue captures unrecoverable failures for manual review
✅ User notification thresholds (notify after N retries, not every failure)
✅ Recovery statistics and success rate tracking
✅ Manual intervention option with preserved state

Phase 6 (Integration) now complete (3/3 subtasks).
Feature 149-auto-recovery-loop-enhancement COMPLETE (13/13 subtasks).

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Added comprehensive summary document for the completed Auto-Recovery Loop Enhancement.
Includes:
- All 13 completed subtasks across 6 phases
- Verification results (9/9 tests passed, 100% pass rate)
- Recovery loop behavior for each failure type
- Files modified/created
- All acceptance criteria met
- Usage instructions for the enhanced recovery system

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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pantoaibot Bot commented Feb 13, 2026

PR Summary:

Auto-Recovery Loop Enhancement: adds smart failure classification, exponential backoff, progressive retry strategies (including model fallback), automated rollback, dead-letter queue, notification thresholds, and recovery strategy metrics — integrated into coder and QA fixer with a full end-to-end test suite.

Key changes:

  • Core recovery logic
    • apps/backend/services/recovery.py: major enhancement
      • Added FailureType.is_recoverable(), RetryStrategy and extended RecoveryAction (wait_seconds, use_model_fallback, strategy, notification fields).
      • Introduced ERROR_PATTERNS database for classification.
      • Added exponential backoff calculation, progressive strategy selection (direct → model_fallback → alternative), and richer determine_recovery_action() behavior (retry, rollback, skip, escalate, continue).
      • Integrated NotificationManager and DeadLetterQueue usage for notification thresholds and escalation/DLQ storage.
      • New helpers to export DLQ reports and query notification/DLQ stats.
      • Circular-fix detection improved via attempt history similarity checks.
  • New services
    • apps/backend/services/dead_letter_queue.py: persistent DLQ with add/get/resolve/export and statistics.
    • apps/backend/services/notification_manager.py: thresholded notification logic, records silent failures and escalations, supports configurable thresholds and statistics.
  • Agent integrations
    • apps/backend/agents/coder.py: uses RecoveryAction lifecycle (pending actions, rollback handling, override_model for model fallback, recovery guidance injection into prompts).
    • apps/backend/qa/fixer.py: QA fixer session enhanced to support recovery loop (pending actions, model fallback via create_client, recovery guidance); default model param added (backwards-compatible).
  • Metrics and observability
    • apps/backend/qa/recovery_metrics.py: added strategy-level statistics, best-strategy detection, and included strategy stats in formatted summaries.
  • Tests & verification
    • apps/backend/test_recovery_loop.py: comprehensive end-to-end verification (9 tests covering classification, backoff, strategy selection, DLQ, notifications, full loop, unknown escalation, is_recoverable).
    • RECOVERY_LOOP_VERIFICATION_SUMMARY.md: verification summary and usage notes.
  • Behavior & performance impacts
    • Prevents API rate limiting with exponential backoff (1s → cap 60s).
    • Reduces user noise via notification thresholds (silent retries below threshold).
    • Automatically rolls back on BROKEN_BUILD when last-good commit exists; escalates and adds to DLQ when not.
    • Unknown errors escalate to DLQ after configured attempts.
    • Adds cross-session attempt history and preserved state for manual intervention.
  • Breaking / compatibility notes
    • Mostly additive and backward-compatible: new fields and classes introduced.
    • coder.py and qa/fixer.py import and use new RecoveryAction semantics — ensure any external consumers of RecoveryAction or RecoveryManager APIs are updated if they relied on previous internal shapes.
    • QA fixer run_qa_fixer_session gained an optional model parameter (default provided) and now may recreate clients for model fallback.
    • New persistent memory files introduced per-spec: dead_letter_queue.json and notifications.json (stored under spec memory dir), and recovery_metrics now contains strategy stats.

Files added/modified (high-level):

  • Added: services/dead_letter_queue.py, services/notification_manager.py, test_recovery_loop.py, RECOVERY_LOOP_VERIFICATION_SUMMARY.md
  • Modified: services/recovery.py (major), qa/recovery_metrics.py (metrics), agents/coder.py, qa/fixer.py

Acceptance: feature verified by end-to-end tests and marked ready for production in verification summary.

Reviewed by Panto AI

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pantoaibot Bot commented Feb 13, 2026

Auto review disabled due to large PR. If you still want me to review this PR? Please comment /review

Comment thread apps/backend/agents/coder.py Fixed
Comment thread apps/backend/qa/fixer.py Fixed
Comment thread apps/backend/qa/fixer.py Fixed
Comment thread apps/backend/test_recovery_loop.py Fixed
Comment thread apps/backend/test_recovery_loop.py Fixed
Comment thread apps/backend/test_recovery_loop.py Fixed
Comment thread apps/backend/test_recovery_loop.py Fixed
Comment thread apps/backend/test_recovery_loop.py Fixed
OBenner and others added 2 commits February 18, 2026 19:22
…to-recovery-loop-enhancement

# Conflicts:
#	apps/backend/agents/coder.py
…ments

- Resolve merge conflicts in coder.py (integrate notify_stuck_subtask from develop)
- Remove unused imports: FailureType in coder.py and fixer.py
- Remove unused variable: attempt_count in fixer.py line 552
- Remove unused imports in test_recovery_loop.py: asyncio, json, RecoveryAction,
  RetryStrategy, DeadLetterQueue, NotificationManager
- Fix ruff I001 (import sorting) in dead_letter_queue.py, notification_manager.py,
  test_recovery_e2e.py
- Fix ruff F541 (f-string without placeholders) in fixer.py, test_recovery_loop.py
- Apply ruff format fixes (line length, trailing commas) across 6 files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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coderabbitai Bot commented Feb 18, 2026

📝 Walkthrough

Walkthrough

This PR implements a six-phase auto-recovery loop enhancement across the backend system. It introduces new components (DeadLetterQueue, NotificationManager), extends the RecoveryManager with exponential backoff and multi-strategy retry logic, integrates recovery workflows into coder and QA fixer agents, and includes comprehensive end-to-end tests verifying failure classification, retry strategies, notifications, and DLQ integration.

Changes

Cohort / File(s) Summary
Core Recovery System
apps/backend/services/recovery.py, apps/backend/services/dead_letter_queue.py, apps/backend/services/notification_manager.py
Adds FailureType.is_recoverable(), RetryStrategy dataclass, and extends RecoveryAction with backoff/fallback fields. Introduces exponential backoff (1s–60s, 2x multiplier), multi-strategy retry selection, and enhanced determine_recovery_action. RecoveryManager now manages DLQ and notifications with new public methods for escalation, statistics, and reporting. DeadLetterQueue provides file-backed persistent storage for unrecoverable failures with atomic operations. NotificationManager tracks retry/escalation thresholds and notification history per subtask.
Agent Integration
apps/backend/agents/coder.py, apps/backend/qa/fixer.py
Both agents now import recovery and model fallback infrastructure. Coder and fixer add state tracking for pending_recovery_action, override_model, and recovery_guidance. Enhanced post-iteration logic classifies failures, determines recovery actions, applies backoff delays, and routes to retry (with optional model fallback), skip, escalate, rollback, or continue. Recovery guidance is injected into prompts when active. Fixer signature updated with model parameter; both agents recreate clients on model fallback and record recovery notifications.
Recovery Metrics
apps/backend/qa/recovery_metrics.py
Adds public methods get_strategy_statistics() and get_most_successful_strategy() to compute per-strategy success rates from recovery history. Extends get_summary and format_summary to report strategy statistics and the most successful retry strategy.
Test Suite
apps/backend/test_recovery_loop.py, apps/backend/test_recovery_e2e.py
Two comprehensive end-to-end test files introduced. test_recovery_loop.py defines RecoveryLoopTest class with 9 sequential test methods covering failure classification, exponential backoff, retry strategy selection, DLQ integration, notification thresholds, circular fix detection, and is_recoverable checks. test_recovery_e2e.py provides parallel verification with TestResults tracking and 11 test cases exercising the same recovery workflows with detailed result summaries.

Sequence Diagram

sequenceDiagram
    participant Agent as Coder/Fixer Agent
    participant RecoveryMgr as RecoveryManager
    participant Classifier as Failure Classifier
    participant RetrySelector as Retry Strategy Selector
    participant Backoff as Backoff Calculator
    participant DLQ as DeadLetterQueue
    participant NotifyMgr as NotificationManager

    Agent->>RecoveryMgr: check_and_recover(subtask_id, error)
    RecoveryMgr->>Classifier: classify_failure(error_message)
    Classifier-->>RecoveryMgr: FailureType
    
    alt Recoverable Failure
        RecoveryMgr->>RetrySelector: select_retry_strategy(failure_type, attempt_count)
        RetrySelector-->>RecoveryMgr: RetryStrategy or None
        
        alt Strategy Available
            RecoveryMgr->>Backoff: calculate_backoff_delay(attempt_count)
            Backoff-->>RecoveryMgr: wait_seconds (exponential)
            
            RecoveryMgr->>NotifyMgr: should_notify(subtask_id, attempt_count)
            NotifyMgr-->>RecoveryMgr: bool
            
            alt Should Notify
                RecoveryMgr->>NotifyMgr: record_notification(details)
                NotifyMgr-->>RecoveryMgr: recorded
            end
            
            RecoveryMgr-->>Agent: RecoveryAction(retry, wait_seconds, fallback_model)
        else No Strategy
            RecoveryMgr->>DLQ: add_failure_to_dlq(context)
            DLQ-->>RecoveryMgr: persisted
            RecoveryMgr->>NotifyMgr: record_notification(escalation)
            NotifyMgr-->>RecoveryMgr: recorded
            RecoveryMgr-->>Agent: RecoveryAction(escalate)
        end
    else Unrecoverable Failure
        RecoveryMgr->>DLQ: add_failure_to_dlq(unrecoverable_context)
        DLQ-->>RecoveryMgr: persisted
        RecoveryMgr-->>Agent: RecoveryAction(escalate)
    end
    
    Agent->>Agent: Apply recovery action (retry, skip, escalate, rollback, continue)
Loading

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~60 minutes

Poem

🐰 Bouncing through the code with glee,
New queues catch failures gracefully,
Backoff strategies hop and play,
Notifications light the way,
Recovery loops, so smart and spry—
Errors won't make our systems cry!

🚥 Pre-merge checks | ✅ 3
✅ Passed checks (3 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check ✅ Passed The title clearly summarizes the main change: a comprehensive auto-recovery loop enhancement with multiple new features (exponential backoff, DLQ, notification thresholds, strategy selection).
Docstring Coverage ✅ Passed Docstring coverage is 92.93% which is sufficient. The required threshold is 80.00%.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.

✨ Finishing Touches
  • 📝 Generate docstrings
🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Post copyable unit tests in a comment
  • Commit unit tests in branch auto-claude/149-auto-recovery-loop-enhancement

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retry strategies, dead-letter queue, and notification thresholds.
"""

import json

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Unused import Note test

Import of 'json' is not used.

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AI 2 months ago

In general, unused imports should be removed to reduce clutter and avoid unnecessary dependencies. The best fix here is to delete the unused import json line and leave all other imports and code intact, preserving existing functionality.

Concretely, in apps/backend/test_recovery_e2e.py, remove line 11 (import json) from the imports section at the top of the file. No additional methods, imports, or definitions are required, since the module is not used anywhere in the shown code.

Suggested changeset 1
apps/backend/test_recovery_e2e.py

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Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/apps/backend/test_recovery_e2e.py b/apps/backend/test_recovery_e2e.py
--- a/apps/backend/test_recovery_e2e.py
+++ b/apps/backend/test_recovery_e2e.py
@@ -8,7 +8,6 @@
 retry strategies, dead-letter queue, and notification thresholds.
 """
 
-import json
 import shutil
 import time
 from pathlib import Path
EOF
@@ -8,7 +8,6 @@
retry strategies, dead-letter queue, and notification thresholds.
"""

import json
import shutil
import time
from pathlib import Path
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import json
import shutil
import time

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In general, to fix an unused import warning, remove the import statement for any module that is not referenced anywhere in the file. This reduces unnecessary dependencies and makes the code clearer.

For this specific file, the best fix that does not change functionality is to delete the import time line at the top of apps/backend/test_recovery_e2e.py. All other imports appear potentially relevant to the shown code. No additional methods, definitions, or imports are required because time is not used in the provided sections.

Concretely:

  • Edit apps/backend/test_recovery_e2e.py.
  • Locate line 13: import time.
  • Remove that line, leaving the rest of the imports unchanged.
Suggested changeset 1
apps/backend/test_recovery_e2e.py

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Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/apps/backend/test_recovery_e2e.py b/apps/backend/test_recovery_e2e.py
--- a/apps/backend/test_recovery_e2e.py
+++ b/apps/backend/test_recovery_e2e.py
@@ -10,7 +10,6 @@
 
 import json
 import shutil
-import time
 from pathlib import Path
 from typing import Any
 
EOF
@@ -10,7 +10,6 @@

import json
import shutil
import time
from pathlib import Path
from typing import Any

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import shutil
import time
from pathlib import Path
from typing import Any

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Import of 'Any' is not used.

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AI 2 months ago

To fix an unused import, the general approach is to remove the import statement (or the specific unused name from a multi-name import) so that the dependency and associated clutter are eliminated.

In this specific file, apps/backend/test_recovery_e2e.py, the best fix is to delete the from typing import Any line at line 15. No other changes are required, since there are no references to Any visible in the provided code, and removing the import does not alter runtime behavior—typing is only for static typing. Concretely, remove the entire line 15 and leave the rest of the imports (json, shutil, time, Path, and the services.* imports) unchanged.

No additional methods, imports, or definitions are needed to implement this change.

Suggested changeset 1
apps/backend/test_recovery_e2e.py

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Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/apps/backend/test_recovery_e2e.py b/apps/backend/test_recovery_e2e.py
--- a/apps/backend/test_recovery_e2e.py
+++ b/apps/backend/test_recovery_e2e.py
@@ -12,7 +12,6 @@
 import shutil
 import time
 from pathlib import Path
-from typing import Any
 
 from services.dead_letter_queue import DeadLetterQueue
 from services.notification_manager import NotificationManager
EOF
@@ -12,7 +12,6 @@
import shutil
import time
from pathlib import Path
from typing import Any

from services.dead_letter_queue import DeadLetterQueue
from services.notification_manager import NotificationManager
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Comment on lines +19 to +24
from services.recovery import (
FailureType,
RecoveryAction,
RecoveryManager,
RetryStrategy,
)

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Import of 'RecoveryAction' is not used.
Import of 'RetryStrategy' is not used.

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AI 2 months ago

To fix the problem, remove the unused names from the import statement so that only the symbols actually used in this file are imported. This preserves all existing behavior while cleaning up unnecessary dependencies.

Concretely, in apps/backend/test_recovery_e2e.py, locate the from services.recovery import (...) block around lines 19–24. Currently it imports FailureType, RecoveryAction, RecoveryManager, and RetryStrategy. Since only FailureType and RecoveryManager are used, edit this block to import just those two names. No additional methods, imports, or definitions are required; we only need to adjust the existing import line(s).

Suggested changeset 1
apps/backend/test_recovery_e2e.py

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Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/apps/backend/test_recovery_e2e.py b/apps/backend/test_recovery_e2e.py
--- a/apps/backend/test_recovery_e2e.py
+++ b/apps/backend/test_recovery_e2e.py
@@ -18,9 +18,7 @@
 from services.notification_manager import NotificationManager
 from services.recovery import (
     FailureType,
-    RecoveryAction,
     RecoveryManager,
-    RetryStrategy,
 )
 
 # =============================================================================
EOF
@@ -18,9 +18,7 @@
from services.notification_manager import NotificationManager
from services.recovery import (
FailureType,
RecoveryAction,
RecoveryManager,
RetryStrategy,
)

# =============================================================================
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Actionable comments posted: 12

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)
apps/backend/services/recovery.py (1)

836-858: 🧹 Nitpick | 🔵 Trivial

Consider using logging instead of print() for error output.

Using print() for error messages (line 857) is not ideal for production code. Structured logging would provide better observability, allow log level filtering, and integrate with monitoring systems.

♻️ Suggested improvement
+import logging
+
+logger = logging.getLogger(__name__)
+
 ...
 
     def rollback_to_commit(self, commit_hash: str) -> bool:
         ...
         except subprocess.CalledProcessError as e:
-            print(f"Error rolling back to {commit_hash}: {e.stderr}")
+            logger.error("Error rolling back to %s: %s", commit_hash, e.stderr)
             return False
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@apps/backend/services/recovery.py` around lines 836 - 858, Replace the
print-based error handling in rollback_to_commit with structured logging: in the
except block for subprocess.CalledProcessError, call an appropriate logger
(e.g., self.logger.error or a module-level logger) and include both a
descriptive message and the error details (e.stderr and/or e) so the failure to
reset to commit_hash is recorded at error level; ensure the method still returns
False after logging. Use the existing logger on the class if available
(self.logger) or create/get a module logger if not.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@apps/backend/agents/coder.py`:
- Around line 326-332: The override_model variable is never reset after being
used as a fallback, so subsequent subtasks can accidentally keep using it; after
you resolve and assign phase_model via resolve_model_id(override_model) and
print the status, clear the override by setting override_model to None (or the
empty value your codebase expects) so the override is single-use; update the
same block where override_model is checked and resolved (the code that calls
resolve_model_id and assigns phase_model) to clear override_model immediately
after selecting the model.

In `@apps/backend/qa/fixer.py`:
- Around line 92-97: The fallback selection currently derives
current_model_shorthand from the original model argument, causing repeated
retries to pick the same fallback; change the logic to track and use an active
model variable (e.g., add/maintain current_model or current_model_shorthand
alongside current_client and override_model) and update it whenever you replace
the client or set override_model so that get_next_fallback (or whatever fallback
lookup uses current_model_shorthand) computes the next fallback from the active
model, not the base model; apply the same change where similar fallback
progression occurs (the other block referenced around the 581-599 area) so each
retry advances through the fallback chain (opus → sonnet → haiku) rather than
restarting from the original model.
- Around line 236-258: The fallback client created when override_model is set
(using resolve_model_id() then create_client(...) and awaited with
current_client.__aenter__()) is not guaranteed to be closed; wrap the iteration
loop that creates/uses current_client in a try/finally so that in the finally
block you check if current_client is not the original client and, if so, await
current_client.__aexit__(None, None, None) to always close the fallback
ClaudeSDKClient; ensure this cleanup logic references the same identifiers
(current_client, client, override_model, create_client, __aenter__, __aexit__)
and does not suppress exceptions other than safe cleanup errors.

In `@apps/backend/qa/recovery_metrics.py`:
- Around line 307-328: In get_most_successful_strategy, best_strategy stays None
when all qualifying strategies have 0.0% because best_rate is initialized to 0.0
and the comparison uses '>'; change the selection logic so a 0% success strategy
can be chosen (e.g., initialize best_rate to -1.0 or use '>=' with a guard for
first assignment) while still enforcing the "min 2 uses" rule (check
stats["total_uses"] >= 2) and comparing stats["success_rate_percent"] to
best_rate before assigning best_strategy and best_rate.

In `@apps/backend/services/dead_letter_queue.py`:
- Around line 306-337: The export_pending_failures function currently only
writes the report when output_path is provided, contradicting the docstring
default of spec_dir/dlq_report.txt; update export_pending_failures to use the
documented default by setting path = Path(output_path) if output_path is given
else Path(self.spec_dir) / "dlq_report.txt" (or similar) and write the report to
that path, ensuring report is still returned; reference the
export_pending_failures method and get_pending_failures for locating the logic
and ensure the docstring matches the implemented behavior.

In `@apps/backend/services/notification_manager.py`:
- Around line 350-371: Validate thresholds in update_thresholds and when loading
persisted settings: in update_thresholds (method name) check that provided
retry_threshold and escalation_threshold are integers >= 1 before assigning
(reject invalid inputs by returning False or raising ValueError instead of
assigning and calling _save_data); also add validation in _load_data to verify
loaded retry_threshold and escalation_threshold are ints >= 1 and if invalid
replace them with safe defaults (e.g., current class defaults or constants) so
corrupted/manual edits to the persisted notifications.json don't propagate and
cause the ZeroDivisionError in should_notify (which uses retry_threshold).

In `@apps/backend/services/recovery.py`:
- Around line 93-123: ERROR_PATTERNS contains overly generic tokens that cause
false positives; update the entries for FailureType.VERIFICATION_FAILED and
FailureType.CONTEXT_EXHAUSTED in ERROR_PATTERNS to use more specific phrases
(e.g., replace "expected" with "expected but got" or "expected value", replace
"timeout" with "timed out" or "timeout exceeded", and replace "context" with
"context limit exceeded" or "context window exhausted"), and remove or tighten
any other ambiguous patterns so matching is done on clear error phrases only;
modify the list literals under ERROR_PATTERNS for FailureType.BROKEN_BUILD,
FailureType.VERIFICATION_FAILED, and FailureType.CONTEXT_EXHAUSTED accordingly.
- Around line 209-240: The docstring for calculate_backoff_delay is inconsistent
with the implementation: it claims "Attempt 0: 1.0s" but the function returns
0.0 for attempt_count <= 0; update the docstring (not the logic) to state that
attempt_count is 0-indexed and that attempt_count == 0 returns 0.0 (no delay),
then show progression starting at attempt_count == 1: BACKOFF_BASE_DELAY (e.g.,
Attempt 1: BACKOFF_BASE_DELAY, Attempt 2: BACKOFF_BASE_DELAY *
BACKOFF_MULTIPLIER, ... capped at BACKOFF_MAX_DELAY) and mention the constants
BACKOFF_BASE_DELAY, BACKOFF_MULTIPLIER, and BACKOFF_MAX_DELAY so callers
understand the behavior.

In `@apps/backend/test_recovery_e2e.py`:
- Around line 139-167: Update the expected_delays in test_exponential_backoff to
match the implementation of calculate_backoff_delay (delay = min(1.0 *
2**attempt, 60.0)); replace the current list with [(0, 0.0), (1, 2.0), (2, 4.0),
(3, 8.0), (4, 16.0), (5, 32.0), (6, 60.0), (10, 60.0)] so the test expectations
align with the exponential backoff calculation used by
RecoveryManager.calculate_backoff_delay.

In `@apps/backend/test_recovery_loop.py`:
- Around line 566-616: run_all_tests currently calls self.print_summary() but
discards its boolean result, causing main() to receive None; update
run_all_tests (the method that iterates tests and calls self.print_summary()) to
return the boolean returned by print_summary() (i.e., capture result =
self.print_summary() and return result) so the CLI's exit code logic receives
the correct pass/fail value; ensure no other early returns break this flow and
keep using self.test_results in print_summary() as-is.

In `@RECOVERY_LOOP_VERIFICATION_SUMMARY.md`:
- Around line 13-37: The markdown headings (e.g., "Phase 1: Smart Failure
Detection ✅", "Phase 2: Alternative Retry Strategies ✅", etc.) lack surrounding
blank lines which triggers MD022; fix by adding a single blank line both above
and below each top-level heading and subheading in
RECOVERY_LOOP_VERIFICATION_SUMMARY.md so every heading is separated from
adjacent paragraphs/lists, ensuring consistent spacing throughout the Phase 1–6
headings and their subtasks.
- Around line 120-125: The lines mentioning agents/coder.py and qa/fixer.py
repeat the adverb "automatically"; edit the two bullet points so each reads
without the duplicated word (e.g., "Coder agents use enhanced recovery via
`agents/coder.py`" and "QA fixer uses enhanced recovery via `qa/fixer.py`"),
leaving the other bullets about
`.auto-claude/specs/XXX/memory/recovery_metrics.json`, `dead_letter_queue.json`,
and `notifications.json` unchanged.

---

Outside diff comments:
In `@apps/backend/services/recovery.py`:
- Around line 836-858: Replace the print-based error handling in
rollback_to_commit with structured logging: in the except block for
subprocess.CalledProcessError, call an appropriate logger (e.g.,
self.logger.error or a module-level logger) and include both a descriptive
message and the error details (e.stderr and/or e) so the failure to reset to
commit_hash is recorded at error level; ensure the method still returns False
after logging. Use the existing logger on the class if available (self.logger)
or create/get a module logger if not.

Comment on lines +326 to +332
# Use override model if set (for model fallback), otherwise use phase model
if override_model:
phase_model = resolve_model_id(override_model)
print_status(f"Using fallback model: {override_model}", "progress")
else:
phase_model = get_phase_model(spec_dir, current_phase, model)

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⚠️ Potential issue | 🟠 Major

Clear override_model after applying the fallback.
Once set, override_model is never reset, so a successful retry can leave subsequent unrelated subtasks running on the fallback model. If the override is meant to be single-use, clear it after selecting the phase model.

🛠️ Suggested fix
-        if override_model:
-            phase_model = resolve_model_id(override_model)
-            print_status(f"Using fallback model: {override_model}", "progress")
+        if override_model:
+            phase_model = resolve_model_id(override_model)
+            print_status(f"Using fallback model: {override_model}", "progress")
+            override_model = None
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@apps/backend/agents/coder.py` around lines 326 - 332, The override_model
variable is never reset after being used as a fallback, so subsequent subtasks
can accidentally keep using it; after you resolve and assign phase_model via
resolve_model_id(override_model) and print the status, clear the override by
setting override_model to None (or the empty value your codebase expects) so the
override is single-use; update the same block where override_model is checked
and resolved (the code that calls resolve_model_id and assigns phase_model) to
clear override_model immediately after selecting the model.

Comment thread apps/backend/qa/fixer.py
Comment on lines +92 to +97
# === ENHANCED RECOVERY: Track recovery state ===
pending_recovery_action: RecoveryAction | None = None
override_model: str | None = None # For model fallback
recovery_guidance: str | None = None # Strategy guidance for next attempt
current_client = client # Track current client (may be replaced for fallback)

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⚠️ Potential issue | 🟠 Major

Fallback chain should progress from the current model, not the base model.
current_model_shorthand is derived from the original model argument, so repeated fallback retries can keep selecting the same fallback instead of progressing (e.g., opus → sonnet → haiku). Track the active model and derive the next fallback from that value.

🛠️ Suggested fix
-    current_client = client  # Track current client (may be replaced for fallback)
+    current_client = client  # Track current client (may be replaced for fallback)
+    active_model = model  # Track active model for fallback chaining
...
-                    current_model_shorthand = model
+                    current_model_shorthand = active_model
...
-                        override_model = fallback_chain[0]  # Use first fallback
+                        override_model = fallback_chain[0]  # Use first fallback
+                        active_model = override_model

Also applies to: 581-599

🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@apps/backend/qa/fixer.py` around lines 92 - 97, The fallback selection
currently derives current_model_shorthand from the original model argument,
causing repeated retries to pick the same fallback; change the logic to track
and use an active model variable (e.g., add/maintain current_model or
current_model_shorthand alongside current_client and override_model) and update
it whenever you replace the client or set override_model so that
get_next_fallback (or whatever fallback lookup uses current_model_shorthand)
computes the next fallback from the active model, not the base model; apply the
same change where similar fallback progression occurs (the other block
referenced around the 581-599 area) so each retry advances through the fallback
chain (opus → sonnet → haiku) rather than restarting from the original model.

Comment thread apps/backend/qa/fixer.py
Comment on lines +236 to +258
# Recreate client if model fallback is needed
if override_model:
print(f"🔄 Using fallback model: {override_model}")
fallback_model = resolve_model_id(override_model)
# Close old client if it's not the original one
if current_client != client:
try:
await current_client.__aexit__(None, None, None)
except Exception:
pass # Ignore cleanup errors
# Create new client with fallback model
current_client = create_client(
project_dir,
spec_dir,
fallback_model,
agent_type="qa_fixer",
max_thinking_tokens=None,
)
# Enter async context for new client
await current_client.__aenter__()
# Reset override after creating new client
override_model = None

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⚠️ Potential issue | 🔴 Critical

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
# First, let's examine the full context of the fixer.py file
wc -l apps/backend/qa/fixer.py

Repository: OBenner/Auto-Coding

Length of output: 91


🏁 Script executed:

#!/bin/bash
# Get the function containing lines 236-258
sed -n '1,300p' apps/backend/qa/fixer.py | head -300

Repository: OBenner/Auto-Coding

Length of output: 11821


🏁 Script executed:

#!/bin/bash
# Check for run_qa_fixer_session callers and create_client usage
rg -n "run_qa_fixer_session" -g '*.py' apps/backend

Repository: OBenner/Auto-Coding

Length of output: 721


🏁 Script executed:

#!/bin/bash
# Look for the complete function signature and structure
rg -n "async def run_qa_fixer_session\|def run_qa_fixer_session" apps/backend/qa/fixer.py -A 200 | head -250

Repository: OBenner/Auto-Coding

Length of output: 45


🏁 Script executed:

#!/bin/bash
# Get the rest of the function after line 300 to see all return paths
sed -n '200,400p' apps/backend/qa/fixer.py

Repository: OBenner/Auto-Coding

Length of output: 9354


🏁 Script executed:

#!/bin/bash
# Get the final part of the function to see how it ends
tail -300 apps/backend/qa/fixer.py | head -350

Repository: OBenner/Auto-Coding

Length of output: 12700


🏁 Script executed:

#!/bin/bash
# Search for all return statements in the function
rg -n "return " apps/backend/qa/fixer.py | grep -E "(line [0-9]+|[0-9]+:)"

Repository: OBenner/Auto-Coding

Length of output: 527


Close fallback ClaudeSDKClient instances to avoid leaking connections.

When a fallback model is used (lines 236-258), a new client is created and __aenter__() is called. However, this client is never properly closed if the function returns early—either via successful completion (lines 487, 522) or early exit on error (lines 622, 640). The client only gets cleaned up if another fallback is created on a subsequent iteration. For long-running sessions or multiple fallback attempts, this can leak connections and resources. Add a try/finally block wrapping the iteration loop to ensure any non-original client is always closed on exit.

Suggested fix (structure)
-    for fixer_iteration in range(1, MAX_FIXER_ITERATIONS + 1):
+    try:
+        for fixer_iteration in range(1, MAX_FIXER_ITERATIONS + 1):
             ...
-            return "fixed", response_text
+            return "fixed", response_text
+    finally:
+        if current_client is not client:
+            try:
+                await current_client.__aexit__(None, None, None)
+            except Exception:
+                pass
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@apps/backend/qa/fixer.py` around lines 236 - 258, The fallback client created
when override_model is set (using resolve_model_id() then create_client(...) and
awaited with current_client.__aenter__()) is not guaranteed to be closed; wrap
the iteration loop that creates/uses current_client in a try/finally so that in
the finally block you check if current_client is not the original client and, if
so, await current_client.__aexit__(None, None, None) to always close the
fallback ClaudeSDKClient; ensure this cleanup logic references the same
identifiers (current_client, client, override_model, create_client, __aenter__,
__aexit__) and does not suppress exceptions other than safe cleanup errors.

Comment on lines +307 to +328
def get_most_successful_strategy(self) -> tuple[str, float] | None:
"""
Get the strategy with the highest success rate.

Returns:
Tuple of (strategy_name, success_rate_percent) or None if no strategies used
"""
strategy_stats = self.get_strategy_statistics()

if not strategy_stats:
return None

# Find strategy with highest success rate (min 2 uses to avoid statistical noise)
best_strategy = None
best_rate = 0.0

for strategy, stats in strategy_stats.items():
if stats["total_uses"] >= 2 and stats["success_rate_percent"] > best_rate:
best_strategy = strategy
best_rate = stats["success_rate_percent"]

return (best_strategy, best_rate) if best_strategy else None
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⚠️ Potential issue | 🟡 Minor

Handle 0% success strategies to avoid returning None.
If all strategies have ≥2 uses but 0% success, best_strategy never gets set because best_rate starts at 0.0 and the comparison uses >. That hides available data in the summary.

🛠️ Suggested fix
-        best_rate = 0.0
+        best_rate = -1.0
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
def get_most_successful_strategy(self) -> tuple[str, float] | None:
"""
Get the strategy with the highest success rate.
Returns:
Tuple of (strategy_name, success_rate_percent) or None if no strategies used
"""
strategy_stats = self.get_strategy_statistics()
if not strategy_stats:
return None
# Find strategy with highest success rate (min 2 uses to avoid statistical noise)
best_strategy = None
best_rate = 0.0
for strategy, stats in strategy_stats.items():
if stats["total_uses"] >= 2 and stats["success_rate_percent"] > best_rate:
best_strategy = strategy
best_rate = stats["success_rate_percent"]
return (best_strategy, best_rate) if best_strategy else None
def get_most_successful_strategy(self) -> tuple[str, float] | None:
"""
Get the strategy with the highest success rate.
Returns:
Tuple of (strategy_name, success_rate_percent) or None if no strategies used
"""
strategy_stats = self.get_strategy_statistics()
if not strategy_stats:
return None
# Find strategy with highest success rate (min 2 uses to avoid statistical noise)
best_strategy = None
best_rate = -1.0
for strategy, stats in strategy_stats.items():
if stats["total_uses"] >= 2 and stats["success_rate_percent"] > best_rate:
best_strategy = strategy
best_rate = stats["success_rate_percent"]
return (best_strategy, best_rate) if best_strategy else None
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@apps/backend/qa/recovery_metrics.py` around lines 307 - 328, In
get_most_successful_strategy, best_strategy stays None when all qualifying
strategies have 0.0% because best_rate is initialized to 0.0 and the comparison
uses '>'; change the selection logic so a 0% success strategy can be chosen
(e.g., initialize best_rate to -1.0 or use '>=' with a guard for first
assignment) while still enforcing the "min 2 uses" rule (check
stats["total_uses"] >= 2) and comparing stats["success_rate_percent"] to
best_rate before assigning best_strategy and best_rate.

Comment on lines +306 to +337
def export_pending_failures(self, output_path: Path | str | None = None) -> str:
"""
Export pending failures to a human-readable format.

Args:
output_path: Optional path to save the export (default: spec_dir/dlq_report.txt)

Returns:
Formatted report as a string
"""
pending = self.get_pending_failures()
if not pending:
report = "No pending failures in the dead-letter queue.\n"
else:
lines = ["DEAD-LETTER QUEUE - PENDING FAILURES", "=" * 50, ""]
for failure in pending:
lines.append(f"ID: {failure['id']}")
lines.append(f"Subtask: {failure['subtask_id']}")
lines.append(f"Type: {failure['failure_type']}")
lines.append(f"Attempts: {failure['attempt_count']}")
lines.append(f"Timestamp: {failure['timestamp']}")
lines.append(f"Error: {failure['error_message'][:200]}")
if failure.get("recovery_action"):
lines.append(f"Last Action: {failure['recovery_action']}")
lines.append("-" * 50)
report = "\n".join(lines)

# Save to file if path provided
if output_path:
path = Path(output_path)
path.write_text(report, encoding="utf-8")

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⚠️ Potential issue | 🟡 Minor

Honor the documented default export path.
The docstring says the default is spec_dir/dlq_report.txt, but when output_path is None nothing is written. Either implement the default or update the docs to avoid surprises.

🛠️ Suggested fix
-        # Save to file if path provided
-        if output_path:
-            path = Path(output_path)
-            path.write_text(report, encoding="utf-8")
+        # Save to file if path provided (or default)
+        if output_path is None:
+            output_path = self.spec_dir / "dlq_report.txt"
+        if output_path:
+            path = Path(output_path)
+            path.write_text(report, encoding="utf-8")
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
def export_pending_failures(self, output_path: Path | str | None = None) -> str:
"""
Export pending failures to a human-readable format.
Args:
output_path: Optional path to save the export (default: spec_dir/dlq_report.txt)
Returns:
Formatted report as a string
"""
pending = self.get_pending_failures()
if not pending:
report = "No pending failures in the dead-letter queue.\n"
else:
lines = ["DEAD-LETTER QUEUE - PENDING FAILURES", "=" * 50, ""]
for failure in pending:
lines.append(f"ID: {failure['id']}")
lines.append(f"Subtask: {failure['subtask_id']}")
lines.append(f"Type: {failure['failure_type']}")
lines.append(f"Attempts: {failure['attempt_count']}")
lines.append(f"Timestamp: {failure['timestamp']}")
lines.append(f"Error: {failure['error_message'][:200]}")
if failure.get("recovery_action"):
lines.append(f"Last Action: {failure['recovery_action']}")
lines.append("-" * 50)
report = "\n".join(lines)
# Save to file if path provided
if output_path:
path = Path(output_path)
path.write_text(report, encoding="utf-8")
def export_pending_failures(self, output_path: Path | str | None = None) -> str:
"""
Export pending failures to a human-readable format.
Args:
output_path: Optional path to save the export (default: spec_dir/dlq_report.txt)
Returns:
Formatted report as a string
"""
pending = self.get_pending_failures()
if not pending:
report = "No pending failures in the dead-letter queue.\n"
else:
lines = ["DEAD-LETTER QUEUE - PENDING FAILURES", "=" * 50, ""]
for failure in pending:
lines.append(f"ID: {failure['id']}")
lines.append(f"Subtask: {failure['subtask_id']}")
lines.append(f"Type: {failure['failure_type']}")
lines.append(f"Attempts: {failure['attempt_count']}")
lines.append(f"Timestamp: {failure['timestamp']}")
lines.append(f"Error: {failure['error_message'][:200]}")
if failure.get("recovery_action"):
lines.append(f"Last Action: {failure['recovery_action']}")
lines.append("-" * 50)
report = "\n".join(lines)
# Save to file if path provided (or default)
if output_path is None:
output_path = self.spec_dir / "dlq_report.txt"
if output_path:
path = Path(output_path)
path.write_text(report, encoding="utf-8")
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@apps/backend/services/dead_letter_queue.py` around lines 306 - 337, The
export_pending_failures function currently only writes the report when
output_path is provided, contradicting the docstring default of
spec_dir/dlq_report.txt; update export_pending_failures to use the documented
default by setting path = Path(output_path) if output_path is given else
Path(self.spec_dir) / "dlq_report.txt" (or similar) and write the report to that
path, ensuring report is still returned; reference the export_pending_failures
method and get_pending_failures for locating the logic and ensure the docstring
matches the implemented behavior.

Comment on lines +209 to +240
def calculate_backoff_delay(self, attempt_count: int) -> float:
"""
Calculate exponential backoff delay for retry attempts.

Implements exponential backoff to prevent API rate limiting and
thundering herd problems. Delay doubles with each attempt, capped
at BACKOFF_MAX_DELAY.

Formula: delay = min(base * multiplier^attempt, max_delay)
Example progression (base=1.0, multiplier=2.0):
- Attempt 0: 1.0s
- Attempt 1: 2.0s
- Attempt 2: 4.0s
- Attempt 3: 8.0s
- Attempt 4: 16.0s
- Attempt 5: 32.0s
- Attempt 6+: 60.0s (capped)

Args:
attempt_count: Number of previous attempts (0-indexed)

Returns:
Delay in seconds before next retry
"""
if attempt_count <= 0:
return 0.0

# Calculate exponential delay: base * multiplier^attempt
delay = BACKOFF_BASE_DELAY * (BACKOFF_MULTIPLIER**attempt_count)

# Cap at maximum delay to prevent excessively long waits
return min(delay, BACKOFF_MAX_DELAY)
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⚠️ Potential issue | 🟡 Minor

Docstring example contradicts the implementation.

The docstring states "Attempt 0: 1.0s" but the code returns 0.0 for attempt_count <= 0. This is confusing for callers.

Either update the docstring to reflect actual behavior, or adjust the implementation if the first attempt should indeed have a 1.0s delay.

📝 Option 1: Fix docstring to match implementation (recommended)
         Example progression (base=1.0, multiplier=2.0):
-            - Attempt 0: 1.0s
-            - Attempt 1: 2.0s
-            - Attempt 2: 4.0s
-            - Attempt 3: 8.0s
-            - Attempt 4: 16.0s
-            - Attempt 5: 32.0s
-            - Attempt 6+: 60.0s (capped)
+            - Attempt 0: 0.0s (no delay for first attempt)
+            - Attempt 1: 2.0s
+            - Attempt 2: 4.0s
+            - Attempt 3: 8.0s
+            - Attempt 4: 16.0s
+            - Attempt 5: 32.0s
+            - Attempt 6+: 60.0s (capped)
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
def calculate_backoff_delay(self, attempt_count: int) -> float:
"""
Calculate exponential backoff delay for retry attempts.
Implements exponential backoff to prevent API rate limiting and
thundering herd problems. Delay doubles with each attempt, capped
at BACKOFF_MAX_DELAY.
Formula: delay = min(base * multiplier^attempt, max_delay)
Example progression (base=1.0, multiplier=2.0):
- Attempt 0: 1.0s
- Attempt 1: 2.0s
- Attempt 2: 4.0s
- Attempt 3: 8.0s
- Attempt 4: 16.0s
- Attempt 5: 32.0s
- Attempt 6+: 60.0s (capped)
Args:
attempt_count: Number of previous attempts (0-indexed)
Returns:
Delay in seconds before next retry
"""
if attempt_count <= 0:
return 0.0
# Calculate exponential delay: base * multiplier^attempt
delay = BACKOFF_BASE_DELAY * (BACKOFF_MULTIPLIER**attempt_count)
# Cap at maximum delay to prevent excessively long waits
return min(delay, BACKOFF_MAX_DELAY)
def calculate_backoff_delay(self, attempt_count: int) -> float:
"""
Calculate exponential backoff delay for retry attempts.
Implements exponential backoff to prevent API rate limiting and
thundering herd problems. Delay doubles with each attempt, capped
at BACKOFF_MAX_DELAY.
Formula: delay = min(base * multiplier^attempt, max_delay)
Example progression (base=1.0, multiplier=2.0):
- Attempt 0: 0.0s (no delay for first attempt)
- Attempt 1: 2.0s
- Attempt 2: 4.0s
- Attempt 3: 8.0s
- Attempt 4: 16.0s
- Attempt 5: 32.0s
- Attempt 6+: 60.0s (capped)
Args:
attempt_count: Number of previous attempts (0-indexed)
Returns:
Delay in seconds before next retry
"""
if attempt_count <= 0:
return 0.0
# Calculate exponential delay: base * multiplier^attempt
delay = BACKOFF_BASE_DELAY * (BACKOFF_MULTIPLIER**attempt_count)
# Cap at maximum delay to prevent excessively long waits
return min(delay, BACKOFF_MAX_DELAY)
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@apps/backend/services/recovery.py` around lines 209 - 240, The docstring for
calculate_backoff_delay is inconsistent with the implementation: it claims
"Attempt 0: 1.0s" but the function returns 0.0 for attempt_count <= 0; update
the docstring (not the logic) to state that attempt_count is 0-indexed and that
attempt_count == 0 returns 0.0 (no delay), then show progression starting at
attempt_count == 1: BACKOFF_BASE_DELAY (e.g., Attempt 1: BACKOFF_BASE_DELAY,
Attempt 2: BACKOFF_BASE_DELAY * BACKOFF_MULTIPLIER, ... capped at
BACKOFF_MAX_DELAY) and mention the constants BACKOFF_BASE_DELAY,
BACKOFF_MULTIPLIER, and BACKOFF_MAX_DELAY so callers understand the behavior.

Comment on lines +139 to +167
def test_exponential_backoff(manager: RecoveryManager, results: TestResults):
"""Test 2: Verify exponential backoff calculations."""
print("\n--- Test 2: Exponential Backoff ---")

expected_delays = [
(0, 0.0), # First attempt - no delay
(1, 1.0), # 1.0 * 2^1 = 2.0, but wait starts after first failure
(2, 2.0), # 1.0 * 2^2 = 4.0
(3, 4.0), # 1.0 * 2^3 = 8.0
(4, 8.0), # 1.0 * 2^4 = 16.0
(5, 16.0), # 1.0 * 2^5 = 32.0
(6, 32.0), # 1.0 * 2^6 = 64.0, capped at 60.0
(10, 60.0), # Capped at max
]

for attempt, expected_delay in expected_delays:
actual_delay = manager.calculate_backoff_delay(attempt)
# Allow for small floating point differences
if abs(actual_delay - expected_delay) < 0.01:
results.add_pass(
f"Backoff delay for attempt {attempt}",
f"{actual_delay:.1f}s (expected {expected_delay:.1f}s)",
)
else:
results.add_fail(
f"Backoff delay for attempt {attempt}",
f"Expected {expected_delay:.1f}s, got {actual_delay:.1f}s",
)

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⚠️ Potential issue | 🟠 Major

🧩 Analysis chain

🏁 Script executed:

find apps/backend -name "*.py" -type f | grep -E "(recovery|backoff)" | head -20

Repository: OBenner/Auto-Coding

Length of output: 369


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cat -n apps/backend/recovery.py | head -100

Repository: OBenner/Auto-Coding

Length of output: 530


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cat -n apps/backend/services/recovery.py | head -150

Repository: OBenner/Auto-Coding

Length of output: 6068


🏁 Script executed:

rg -n "def calculate_backoff_delay" apps/backend/services/recovery.py -A 10

Repository: OBenner/Auto-Coding

Length of output: 581


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rg -n "def calculate_backoff_delay" apps/backend/services/recovery.py -A 20

Repository: OBenner/Auto-Coding

Length of output: 897


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rg -n "def calculate_backoff_delay" apps/backend/services/recovery.py -A 25

Repository: OBenner/Auto-Coding

Length of output: 1047


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rg -n "def calculate_backoff_delay" apps/backend/services/recovery.py -A 30

Repository: OBenner/Auto-Coding

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rg -n "def calculate_backoff_delay" apps/backend/services/recovery.py -A 35

Repository: OBenner/Auto-Coding

Length of output: 1477


🏁 Script executed:

cat -n apps/backend/test_recovery_loop.py | grep -A 30 "backoff\|BACKOFF" | head -60

Repository: OBenner/Auto-Coding

Length of output: 2264


🏁 Script executed:

rg -n "expected_delays = " apps/backend/test_recovery_loop.py -A 10

Repository: OBenner/Auto-Coding

Length of output: 483


Fix expected backoff delay values to match the exponential formula.

The expected_delays values are incorrect due to an off-by-one pattern. The implementation calculates delay = min(1.0 * 2^attempt, 60.0), which produces: attempt 0→0.0s, 1→2.0s, 2→4.0s, 3→8.0s, 4→16.0s, 5→32.0s, 6→60.0s. However, your test expects: 1→1.0s, 2→2.0s, 3→4.0s, etc. This test will fail when executed. Update expected_delays to [(0, 0.0), (1, 2.0), (2, 4.0), (3, 8.0), (4, 16.0), (5, 32.0), (6, 60.0), (10, 60.0)] to match test_recovery_loop.py and the actual calculate_backoff_delay() implementation.

🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@apps/backend/test_recovery_e2e.py` around lines 139 - 167, Update the
expected_delays in test_exponential_backoff to match the implementation of
calculate_backoff_delay (delay = min(1.0 * 2**attempt, 60.0)); replace the
current list with [(0, 0.0), (1, 2.0), (2, 4.0), (3, 8.0), (4, 16.0), (5, 32.0),
(6, 60.0), (10, 60.0)] so the test expectations align with the exponential
backoff calculation used by RecoveryManager.calculate_backoff_delay.

Comment on lines +566 to +616
def run_all_tests(self):
"""Run all recovery loop tests."""
print("\n" + "=" * 70)
print("RUNNING RECOVERY LOOP TESTS")
print("=" * 70)

tests = [
self.test_1_failure_classification,
self.test_2_exponential_backoff,
self.test_3_retry_strategy_selection,
self.test_4_recovery_action_determination,
self.test_5_dead_letter_queue,
self.test_6_notification_thresholds,
self.test_7_full_recovery_loop_simulation,
self.test_8_unknown_failure_escalation,
self.test_9_is_recoverable_method,
]

for test in tests:
try:
test()
except Exception as e:
print(f"\n✗ Test failed with exception: {e}")
import traceback

traceback.print_exc()

self.print_summary()

def print_summary(self):
"""Print test summary."""
print("\n" + "=" * 70)
print("TEST SUMMARY")
print("=" * 70)

passed = sum(1 for r in self.test_results if r["passed"])
total = len(self.test_results)
pass_rate = (passed / total * 100) if total > 0 else 0

print(f"\nTotal Tests: {total}")
print(f"Passed: {passed}")
print(f"Failed: {total - passed}")
print(f"Pass Rate: {pass_rate:.1f}%")

if passed == total:
print("\n✓ ALL TESTS PASSED - Recovery loop is working correctly!")
return True
else:
print("\n✗ SOME TESTS FAILED - Review failures above")
return False

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⚠️ Potential issue | 🟠 Major

run_all_tests never returns a boolean, so the CLI always exits 1.
main() uses the return value to determine the exit code, but run_all_tests() returns None unconditionally, making the script fail even when tests pass.

🛠️ Suggested fix
-        self.print_summary()
+        return self.print_summary()
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@apps/backend/test_recovery_loop.py` around lines 566 - 616, run_all_tests
currently calls self.print_summary() but discards its boolean result, causing
main() to receive None; update run_all_tests (the method that iterates tests and
calls self.print_summary()) to return the boolean returned by print_summary()
(i.e., capture result = self.print_summary() and return result) so the CLI's
exit code logic receives the correct pass/fail value; ensure no other early
returns break this flow and keep using self.test_results in print_summary()
as-is.

Comment on lines +13 to +37
### Phase 1: Smart Failure Detection ✅
- **subtask-1-1:** Added error pattern database to classify_failure (5 failure types)
- **subtask-1-2:** Added is_recoverable() method to FailureType enum

### Phase 2: Alternative Retry Strategies ✅
- **subtask-2-1:** Added exponential backoff to RecoveryManager (1s→60s, 2x multiplier)
- **subtask-2-2:** Integrated model_fallback into determine_recovery_action
- **subtask-2-3:** Added alternative strategy selection logic (direct → fallback → alternative)

### Phase 3: Dead-Letter Queue ✅
- **subtask-3-1:** Created DeadLetterQueue class (339 lines)
- **subtask-3-2:** Integrated DLQ with RecoveryManager

### Phase 4: Notification Thresholds ✅
- **subtask-4-1:** Created NotificationManager class
- **subtask-4-2:** Integrated notifications with RecoveryManager

### Phase 5: Recovery Statistics ✅
- **subtask-5-1:** Added strategy tracking to RecoveryMetrics

### Phase 6: Integration ✅
- **subtask-6-1:** Update coder agent to use enhanced recovery
- **subtask-6-2:** Update qa_fixer to use enhanced recovery
- **subtask-6-3:** End-to-end verification of recovery loop ⭐ **THIS SUBTASK**

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⚠️ Potential issue | 🟡 Minor

Add blank lines around headings to satisfy MD022.
Markdownlint flags several headings missing surrounding blank lines; fixing these improves consistency and lint cleanliness.

🧰 Tools
🪛 markdownlint-cli2 (0.21.0)

[warning] 13-13: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


[warning] 17-17: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


[warning] 22-22: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


[warning] 26-26: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


[warning] 30-30: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


[warning] 33-33: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)

🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@RECOVERY_LOOP_VERIFICATION_SUMMARY.md` around lines 13 - 37, The markdown
headings (e.g., "Phase 1: Smart Failure Detection ✅", "Phase 2: Alternative
Retry Strategies ✅", etc.) lack surrounding blank lines which triggers MD022;
fix by adding a single blank line both above and below each top-level heading
and subheading in RECOVERY_LOOP_VERIFICATION_SUMMARY.md so every heading is
separated from adjacent paragraphs/lists, ensuring consistent spacing throughout
the Phase 1–6 headings and their subtasks.

Comment on lines +120 to +125
To use the enhanced recovery:
1. Coder agents automatically use enhanced recovery via `agents/coder.py`
2. QA fixer automatically uses enhanced recovery via `qa/fixer.py`
3. Recovery statistics tracked in `.auto-claude/specs/XXX/memory/recovery_metrics.json`
4. Dead-letter queue available in `.auto-claude/specs/XXX/memory/dead_letter_queue.json`
5. Notification history in `.auto-claude/specs/XXX/memory/notifications.json`
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⚠️ Potential issue | 🟡 Minor

Remove the duplicated “automatically”.
LanguageTool flagged the repeated adverb; simplifying the phrasing reads better.

🛠️ Suggested edit
-1. Coder agents automatically use enhanced recovery via `agents/coder.py`
-2. QA fixer automatically uses enhanced recovery via `qa/fixer.py`
+1. Coder agents use enhanced recovery via `agents/coder.py`
+2. QA fixer uses enhanced recovery via `qa/fixer.py`
🧰 Tools
🪛 LanguageTool

[style] ~122-~122: This adverb was used twice in the sentence. Consider removing one of them or replacing them with a synonym.
Context: ...overy via agents/coder.py 2. QA fixer automatically uses enhanced recovery via `qa/fixer.py...

(ADVERB_REPETITION_PREMIUM)

🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@RECOVERY_LOOP_VERIFICATION_SUMMARY.md` around lines 120 - 125, The lines
mentioning agents/coder.py and qa/fixer.py repeat the adverb "automatically";
edit the two bullet points so each reads without the duplicated word (e.g.,
"Coder agents use enhanced recovery via `agents/coder.py`" and "QA fixer uses
enhanced recovery via `qa/fixer.py`"), leaving the other bullets about
`.auto-claude/specs/XXX/memory/recovery_metrics.json`, `dead_letter_queue.json`,
and `notifications.json` unchanged.

The enhanced recovery system now returns reason strings with the format
"failure_type: Strategy description (attempt N/M)" instead of the old
"retry with different approach" format.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@sonarqubecloud
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@OBenner OBenner merged commit b938320 into develop Feb 18, 2026
18 checks passed
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2 participants