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BUG-HUNT: [error-handling] Silent exception suppression in _build_facade #7904

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opened 2026-04-12 07:06:30 +00:00 by HAL9000 · 4 comments

HAL9000 commented

2026-04-12 07:06:30 +00:00

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Metadata

Branch: bugfix/m6-error-handling-build-facade-silent-exception-suppression
Commit Message: fix(a2a): replace broad exception suppression in _build_facade with logged warnings
Milestone: None — see backlog note below
Parent Epic: #4949

Bug Report: [error-handling] — Silent exception suppression in _build_facade

Severity Assessment

Impact: Configuration errors or service initialization failures are silently ignored, leading to a partially-initialized system that may fail unexpectedly at runtime. This makes debugging difficult as the root cause of the failure is hidden.
Likelihood: Medium. This is likely to occur in development or staging environments if a service is misconfigured or a dependency is missing.
Priority: Medium

Location

File: src/cleveragents/a2a/cli_bootstrap.py
Function/Class: _build_facade
Lines: 39-50

Description

The _build_facade function in cli_bootstrap.py uses contextlib.suppress(Exception) to catch and ignore any exceptions that occur when retrieving services from the dependency injection container. This is a dangerous practice as it can hide critical errors, such as misconfigurations or missing dependencies, that prevent a service from being created. The application will continue to run with a partially-initialized facade, which can lead to unexpected errors and behavior at runtime that are difficult to trace back to the original problem.

Evidence

    with contextlib.suppress(Exception):
        services["plan_lifecycle_service"] = container.plan_lifecycle_service()

    with contextlib.suppress(Exception):
        services["session_service"] = container.session_service()

    with contextlib.suppress(Exception):
        services["resource_registry_service"] = container.resource_registry_service()

    with contextlib.suppress(Exception):
        services["tool_registry"] = container.tool_registry()

Expected Behavior

Exceptions during service creation should be logged with a warning, and the system should make it clear that a service failed to load. The application should not silently continue with a partially-initialized facade. A better approach would be to catch specific, expected exceptions and log any other exceptions as warnings or errors.

Suggested Fix

Replace the broad contextlib.suppress(Exception) with a more specific exception handler that logs the error. For example:

    try:
        services["plan_lifecycle_service"] = container.plan_lifecycle_service()
    except Exception as e:
        logger.warning("Failed to load plan_lifecycle_service", exc_info=e)

This will ensure that any errors are visible in the logs, making it easier to diagnose and fix configuration or dependency issues.

TDD Note

After this bug issue is verified, a corresponding Type/Testing issue will be
created for TDD. The test will use tags: @tdd_issue, @tdd_issue_,
and @tdd_expected_fail to prove the bug exists before fixing it.

Subtasks

Reproduce the issue by triggering a service initialization failure in _build_facade (e.g., misconfigure a dependency)
Determine the correct logging strategy (warning vs. error) per project error-handling philosophy
Replace all contextlib.suppress(Exception) blocks in _build_facade with try/except blocks that log the exception with context
Ensure the logger is properly initialized in cli_bootstrap.py
Tests (Behave): Add scenarios for _build_facade service initialization failure with logging verification
Tests (Robot): Add integration test for partially-initialized facade behavior
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.
All nox stages pass.
Coverage ≥ 97%.

Backlog note: This issue was discovered during autonomous operation
on milestone v3.5.0. It does not block milestone completion and has been
placed in the backlog for human review and future milestone assignment.

Automated by CleverAgents Bot
Supervisor: Bug Hunting | Agent: new-issue-creator

## Metadata - **Branch**: `bugfix/m6-error-handling-build-facade-silent-exception-suppression` - **Commit Message**: `fix(a2a): replace broad exception suppression in _build_facade with logged warnings` - **Milestone**: _None — see backlog note below_ - **Parent Epic**: #4949 ## Bug Report: [error-handling] — Silent exception suppression in _build_facade ### Severity Assessment - **Impact**: Configuration errors or service initialization failures are silently ignored, leading to a partially-initialized system that may fail unexpectedly at runtime. This makes debugging difficult as the root cause of the failure is hidden. - **Likelihood**: Medium. This is likely to occur in development or staging environments if a service is misconfigured or a dependency is missing. - **Priority**: Medium ### Location - **File**: `src/cleveragents/a2a/cli_bootstrap.py` - **Function/Class**: `_build_facade` - **Lines**: 39-50 ### Description The `_build_facade` function in `cli_bootstrap.py` uses `contextlib.suppress(Exception)` to catch and ignore any exceptions that occur when retrieving services from the dependency injection container. This is a dangerous practice as it can hide critical errors, such as misconfigurations or missing dependencies, that prevent a service from being created. The application will continue to run with a partially-initialized facade, which can lead to unexpected errors and behavior at runtime that are difficult to trace back to the original problem. ### Evidence ```python with contextlib.suppress(Exception): services["plan_lifecycle_service"] = container.plan_lifecycle_service() with contextlib.suppress(Exception): services["session_service"] = container.session_service() with contextlib.suppress(Exception): services["resource_registry_service"] = container.resource_registry_service() with contextlib.suppress(Exception): services["tool_registry"] = container.tool_registry() ``` ### Expected Behavior Exceptions during service creation should be logged with a warning, and the system should make it clear that a service failed to load. The application should not silently continue with a partially-initialized facade. A better approach would be to catch specific, expected exceptions and log any other exceptions as warnings or errors. ### Suggested Fix Replace the broad `contextlib.suppress(Exception)` with a more specific exception handler that logs the error. For example: ```python try: services["plan_lifecycle_service"] = container.plan_lifecycle_service() except Exception as e: logger.warning("Failed to load plan_lifecycle_service", exc_info=e) ``` This will ensure that any errors are visible in the logs, making it easier to diagnose and fix configuration or dependency issues. ### Category error-handling ### TDD Note After this bug issue is verified, a corresponding Type/Testing issue will be created for TDD. The test will use tags: @tdd_issue, @tdd_issue_<this-issue-number>, and @tdd_expected_fail to prove the bug exists before fixing it. ## Subtasks - [ ] Reproduce the issue by triggering a service initialization failure in `_build_facade` (e.g., misconfigure a dependency) - [ ] Determine the correct logging strategy (warning vs. error) per project error-handling philosophy - [ ] Replace all `contextlib.suppress(Exception)` blocks in `_build_facade` with `try/except` blocks that log the exception with context - [ ] Ensure the logger is properly initialized in `cli_bootstrap.py` - [ ] Tests (Behave): Add scenarios for `_build_facade` service initialization failure with logging verification - [ ] Tests (Robot): Add integration test for partially-initialized facade behavior - [ ] 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. - All nox stages pass. - Coverage ≥ 97%. > **Backlog note:** This issue was discovered during autonomous operation > on milestone v3.5.0. It does not block milestone completion and has been > placed in the backlog for human review and future milestone assignment. --- **Automated by CleverAgents Bot** Supervisor: Bug Hunting | Agent: new-issue-creator

HAL9000 added a new dependency

2026-04-12 07:08:07 +00:00

#4949 EPIC: A2A Local Facade & Event Queue — Session/Plan Lifecycle Operations

HAL9000 added the

State

Unverified

label

2026-04-12 07:18:48 +00:00

HAL9000 referenced this issue

2026-04-12 07:19:43 +00:00

[AUTO-EPIC] Epic Planning Update (Cycle 26) #7908

HAL9000 referenced this issue

2026-04-12 07:29:56 +00:00

[AUTO-EPIC] Epic Planning Update (Cycle 26) #7908

HAL9000 commented

2026-04-12 08:08:15 +00:00

Author

Owner

Test Infrastructure Analysis Pool Status — 2026-04-12 06:55:42

Agent: test-infra-improver
Cycle: 1
Estimated Cycle Interval: 10min
Reporting Interval: 10 minutes (Next report expected: 2026-04-12T07:05:42Z)
Status: active

Summary

Test infrastructure analysis pool managing 2 workers analyzing 2 of 8 areas. 6 areas are currently blocked due to a repository access issue.

Details

Pool Status: Active - analyzing testing infrastructure optimization opportunities
Active Workers: 2 / 8
Progress: 2/8 areas analyzed (25%)
Findings Filed: 0 improvement proposals

Analysis Areas Progress

Area	Status
ci-execution-time	In Progress
flaky-tests	In Progress
coverage-gaps	Blocked
test-architecture	Blocked
ci-pipeline-design	Blocked
test-data-quality	Blocked
missing-test-levels	Blocked
dependency-security	Blocked

Health Indicators

Analysis Completion: 2/8 (25%)
Worker Utilization: 2/8 (25%)
Improvement Rate: 0 proposals across 2 areas
System Status: Degraded - Repository access issues are blocking 75% of analysis.

Next Actions

Continue monitoring 2 active analysis workers
Investigate and resolve the git clone permission issue.
Next health report in ~10 minutes

Automated by CleverAgents Bot
Supervisor: AUTO-INF-POOL | Agent: test-infra-improver

# Test Infrastructure Analysis Pool Status — 2026-04-12 06:55:42 **Agent**: test-infra-improver **Cycle**: 1 **Estimated Cycle Interval**: 10min **Reporting Interval**: 10 minutes (Next report expected: 2026-04-12T07:05:42Z) **Status**: active ## Summary Test infrastructure analysis pool managing 2 workers analyzing 2 of 8 areas. 6 areas are currently blocked due to a repository access issue. ## Details **Pool Status**: Active - analyzing testing infrastructure optimization opportunities **Active Workers**: 2 / 8 **Progress**: 2/8 areas analyzed (25%) **Findings Filed**: 0 improvement proposals ### Analysis Areas Progress | Area | Status | |---|---| | ci-execution-time | In Progress | | flaky-tests | In Progress | | coverage-gaps | Blocked | | test-architecture | Blocked | | ci-pipeline-design | Blocked | | test-data-quality | Blocked | | missing-test-levels | Blocked | | dependency-security | Blocked | ## Health Indicators - **Analysis Completion**: 2/8 (25%) - **Worker Utilization**: 2/8 (25%) - **Improvement Rate**: 0 proposals across 2 areas - **System Status**: Degraded - Repository access issues are blocking 75% of analysis. ## Next Actions - Continue monitoring 2 active analysis workers - Investigate and resolve the `git clone` permission issue. - Next health report in ~10 minutes --- **Automated by CleverAgents Bot** Supervisor: AUTO-INF-POOL | Agent: test-infra-improver

freemo added the

labels

2026-04-12 18:33:27 +00:00

HAL9000 added

and removed

labels

2026-04-14 05:57:42 +00:00

HAL9000 commented

2026-04-14 05:57:42 +00:00

Author

Owner

✅ Verified — Bug: silent exception suppression in _build_facade hides errors. MoSCoW: Should-have. Priority: Medium.

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

✅ **Verified** — Bug: silent exception suppression in _build_facade hides errors. MoSCoW: Should-have. Priority: Medium. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner-pool-supervisor

HAL9000 commented

2026-04-14 06:11:01 +00:00

Author

Owner

✅ Verified — Bug: silent exception suppression in _build_facade hides errors. MoSCoW: Should-have. Priority: Medium.

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