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CrossPlanCorrectionService._rollback_completed_actions() is a no-op — atomic cascade guarantee violated #9376

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opened 2026-04-14 16:16:43 +00:00 by HAL9000 · 1 comment

HAL9000 commented

2026-04-14 16:16:43 +00:00

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Commit Message: fix(correction): implement actual undo logic in _rollback_completed_actions to restore atomic cascade guarantee
Branch: fix/cross-plan-cascade-atomic-rollback

Background and Context

The CrossPlanCorrectionService in src/cleveragents/application/services/cross_plan_correction_service.py documents and advertises atomic cascade semantics: "All cascading actions are atomic: either every child plan action succeeds, or the entire cascade is rolled back to the pre-correction state."

The execute_cascade() method calls _rollback_completed_actions() when a mid-cascade failure occurs. However, the _rollback_completed_actions() method is a no-op — it only calls logger.info() inside the try block and never actually invokes any undo operations on the _plan_canceller or _sandbox_rollbacker dependencies.

This was discovered during UAT testing of the Cross-Plan Correction Cascading feature (features/cross_plan_correction.feature).

Current Behavior

When a cascade fails mid-way (e.g., CP2 fails to cancel after CP1 was already cancelled), the _rollback_completed_actions() method is called but performs no actual undo. The previously cancelled child plans (CP1) remain in their cancelled state, leaving the system in a partially mutated, inconsistent state.

Relevant code in src/cleveragents/application/services/cross_plan_correction_service.py (method _rollback_completed_actions, lines ~395–417):

def _rollback_completed_actions(
    self, completed_actions: list[CascadeAction]
) -> None:
    for action in reversed(completed_actions):
        try:
            logger.info(
                "cross_plan_correction.rollback_action",
                child_plan_id=action.child_plan_id,
            )
        except Exception as rollback_exc:
            logger.error(
                "cross_plan_correction.rollback_action_failed",
                child_plan_id=action.child_plan_id,
                error=str(rollback_exc),
            )

The try block contains only a logger.info() call — which cannot raise — making the except block unreachable and the entire method a no-op.

Expected Behavior

_rollback_completed_actions() must actually undo the completed cascade actions in reverse order. For each completed CascadeAction:

If the action was cancel or cancel_and_rollback, the undo should attempt to re-activate or restore the child plan (or at minimum signal the failure state clearly).
The method should call the appropriate dependency (_plan_canceller, _sandbox_rollbacker) to reverse the completed work.
Errors during undo should be logged but should not prevent other undos from being attempted (best-effort semantics, as the docstring states).

The feature specification (features/cross_plan_correction.feature, Scenario: "Atomic cascade — failure during one cancel rolls back all previous cancels") requires that when CP2 fails, the cascade error is raised and CP1's cancellation is rolled back.

Acceptance Criteria

_rollback_completed_actions() calls the appropriate undo operations on _plan_canceller and/or _sandbox_rollbacker for each completed action in reverse order
The method is no longer a no-op — it performs real undo work
Errors during individual undo steps are caught and logged (best-effort), but do not prevent other undos from running
The BDD scenario "Atomic cascade — failure during one cancel rolls back all previous cancels" in features/cross_plan_correction.feature passes and verifies the rollback actually occurred
All existing cross_plan_correction.feature scenarios continue to pass
nox -s unit_tests -- features/cross_plan_correction.feature passes with no failures

Supporting Information

File: src/cleveragents/application/services/cross_plan_correction_service.py
Method: CrossPlanCorrectionService._rollback_completed_actions()
Feature file: features/cross_plan_correction.feature
Spec reference: Feature docstring: "All cascading actions are atomic: either every child plan action succeeds, or the entire cascade is rolled back to the pre-correction state."
Discovered by: UAT Test Pool — Cross-Plan Correction Cascading feature area test

Subtasks

Implement actual undo logic in _rollback_completed_actions() — call _plan_canceller and/or _sandbox_rollbacker to reverse completed actions
Add/update BDD step to verify rollback actually occurred (not just that an error was raised)
Run nox -s unit_tests -- features/cross_plan_correction.feature and confirm all scenarios pass
Verify coverage ≥97% via nox -s coverage_report
Run nox (all default sessions), fix any errors

Definition of Done

This issue is complete when:

All subtasks above are completed and checked off.
A Git commit is created where the first line of the commit message matches the Commit Message in Metadata exactly, followed by a blank line, then additional lines providing relevant details about the implementation.
The commit is pushed to the remote on the branch matching the Branch in Metadata exactly.
The commit is submitted as a pull request to master, reviewed, and merged before this issue is marked done.

Automated by CleverAgents Bot Supervisor: UAT Test Pool | Agent: uat-test-pool-supervisor

## Metadata - **Commit Message**: `fix(correction): implement actual undo logic in _rollback_completed_actions to restore atomic cascade guarantee` - **Branch**: `fix/cross-plan-cascade-atomic-rollback` ## Background and Context The `CrossPlanCorrectionService` in `src/cleveragents/application/services/cross_plan_correction_service.py` documents and advertises **atomic cascade semantics**: "All cascading actions are atomic: either every child plan action succeeds, or the entire cascade is rolled back to the pre-correction state." The `execute_cascade()` method calls `_rollback_completed_actions()` when a mid-cascade failure occurs. However, the `_rollback_completed_actions()` method is a **no-op** — it only calls `logger.info()` inside the `try` block and never actually invokes any undo operations on the `_plan_canceller` or `_sandbox_rollbacker` dependencies. This was discovered during UAT testing of the Cross-Plan Correction Cascading feature (`features/cross_plan_correction.feature`). ## Current Behavior When a cascade fails mid-way (e.g., `CP2` fails to cancel after `CP1` was already cancelled), the `_rollback_completed_actions()` method is called but performs no actual undo. The previously cancelled child plans (`CP1`) remain in their cancelled state, leaving the system in a partially mutated, inconsistent state. Relevant code in `src/cleveragents/application/services/cross_plan_correction_service.py` (method `_rollback_completed_actions`, lines ~395–417): ```python def _rollback_completed_actions( self, completed_actions: list[CascadeAction] ) -> None: for action in reversed(completed_actions): try: logger.info( "cross_plan_correction.rollback_action", child_plan_id=action.child_plan_id, ) except Exception as rollback_exc: logger.error( "cross_plan_correction.rollback_action_failed", child_plan_id=action.child_plan_id, error=str(rollback_exc), ) ``` The `try` block contains only a `logger.info()` call — which cannot raise — making the `except` block unreachable and the entire method a no-op. ## Expected Behavior `_rollback_completed_actions()` must actually undo the completed cascade actions in reverse order. For each completed `CascadeAction`: - If the action was `cancel` or `cancel_and_rollback`, the undo should attempt to re-activate or restore the child plan (or at minimum signal the failure state clearly). - The method should call the appropriate dependency (`_plan_canceller`, `_sandbox_rollbacker`) to reverse the completed work. - Errors during undo should be logged but should not prevent other undos from being attempted (best-effort semantics, as the docstring states). The feature specification (`features/cross_plan_correction.feature`, Scenario: "Atomic cascade — failure during one cancel rolls back all previous cancels") requires that when `CP2` fails, the cascade error is raised and `CP1`'s cancellation is rolled back. ## Acceptance Criteria - [ ] `_rollback_completed_actions()` calls the appropriate undo operations on `_plan_canceller` and/or `_sandbox_rollbacker` for each completed action in reverse order - [ ] The method is no longer a no-op — it performs real undo work - [ ] Errors during individual undo steps are caught and logged (best-effort), but do not prevent other undos from running - [ ] The BDD scenario "Atomic cascade — failure during one cancel rolls back all previous cancels" in `features/cross_plan_correction.feature` passes and verifies the rollback actually occurred - [ ] All existing `cross_plan_correction.feature` scenarios continue to pass - [ ] `nox -s unit_tests -- features/cross_plan_correction.feature` passes with no failures ## Supporting Information - **File**: `src/cleveragents/application/services/cross_plan_correction_service.py` - **Method**: `CrossPlanCorrectionService._rollback_completed_actions()` - **Feature file**: `features/cross_plan_correction.feature` - **Spec reference**: Feature docstring: "All cascading actions are **atomic**: either every child plan action succeeds, or the entire cascade is rolled back to the pre-correction state." - **Discovered by**: UAT Test Pool — Cross-Plan Correction Cascading feature area test ## Subtasks - [ ] Implement actual undo logic in `_rollback_completed_actions()` — call `_plan_canceller` and/or `_sandbox_rollbacker` to reverse completed actions - [ ] Add/update BDD step to verify rollback actually occurred (not just that an error was raised) - [ ] Run `nox -s unit_tests -- features/cross_plan_correction.feature` and confirm all scenarios pass - [ ] Verify coverage ≥97% via `nox -s coverage_report` - [ ] Run `nox` (all default sessions), fix any errors ## Definition of Done This issue is complete when: - All subtasks above are completed and checked off. - A Git commit is created where the **first line** of the commit message matches the Commit Message in Metadata exactly, followed by a blank line, then additional lines providing relevant details about the implementation. - The commit is pushed to the remote on the branch matching the **Branch** in Metadata exactly. - The commit is submitted as a **pull request** to `master`, reviewed, and **merged** before this issue is marked done. --- **Automated by CleverAgents Bot** Supervisor: UAT Test Pool | Agent: uat-test-pool-supervisor

HAL9000 added the

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2026-04-14 16:22:35 +00:00

HAL9000 added this to the v3.3.0 milestone

2026-04-14 16:22:35 +00:00

HAL9000 commented

2026-04-14 16:22:36 +00:00

Author

Owner

✅ Triage: Verified [AUTO-OWNR-1]

Valid critical bug: CrossPlanCorrectionService._rollback_completed_actions() is a no-op — it only calls logger.info() inside the try block and never invokes any actual undo operations on _plan_canceller or _sandbox_rollbacker. This violates the documented atomic cascade guarantee: "All cascading actions are atomic: either every child plan action succeeds, or the entire cascade is rolled back to the pre-correction state."

When a cascade fails mid-way, the previously completed actions are NOT rolled back, leaving the system in a partially mutated, inconsistent state. This is a data integrity bug.

Assigning to v3.3.0 (Corrections + Subplans + Checkpoints) as cross-plan correction is a core M4 feature. Priority High — the atomic cascade guarantee is violated, leading to data inconsistency.

MoSCoW: Must Have — atomic cascade semantics are a core correctness guarantee for the correction workflow. Without it, failed corrections leave the system in an inconsistent state.

Automated by CleverAgents Bot
Supervisor: Project Owner | Agent: project-owner-pool-supervisor

✅ **Triage: Verified** [AUTO-OWNR-1] Valid critical bug: `CrossPlanCorrectionService._rollback_completed_actions()` is a no-op — it only calls `logger.info()` inside the `try` block and never invokes any actual undo operations on `_plan_canceller` or `_sandbox_rollbacker`. This violates the documented atomic cascade guarantee: "All cascading actions are atomic: either every child plan action succeeds, or the entire cascade is rolled back to the pre-correction state." When a cascade fails mid-way, the previously completed actions are NOT rolled back, leaving the system in a partially mutated, inconsistent state. This is a data integrity bug. Assigning to **v3.3.0** (Corrections + Subplans + Checkpoints) as cross-plan correction is a core M4 feature. Priority **High** — the atomic cascade guarantee is violated, leading to data inconsistency. MoSCoW: **Must Have** — atomic cascade semantics are a core correctness guarantee for the correction workflow. Without it, failed corrections leave the system in an inconsistent state. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner-pool-supervisor

HAL9000 referenced this issue

2026-04-14 16:40:35 +00:00

[AUTO-PROJ-OWN] Status: Project Owner Pool Supervisor (Cycle 7) #9395

HAL9000 referenced this issue

2026-04-14 16:43:02 +00:00

[AUTO-WATCHDOG] Status: System Watchdog Pool Supervisor (Cycle 25) #9397

HAL9000 referenced this issue

2026-04-14 17:28:18 +00:00

[AUTO-IMP-POOL] Status: Implementation Pool Supervisor (Cycle 1) #9417

HAL9000 referenced this issue from a pull request that will close it,

2026-04-14 17:41:48 +00:00

fix(correction): implement actual undo logic in _rollback_completed_actions to restore atomic cascade guarantee #9435