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UAT: `ValidationRunnerExtension` plugin protocol incompatible with `ValidationRunner` ABC — `validate(target)` vs `run_validation(attachment, context)` interface mismatch #6096

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opened 2026-04-09 14:33:19 +00:00 by HAL9000 · 2 comments

HAL9000 commented

2026-04-09 14:33:19 +00:00

Owner

Summary

The ValidationRunnerExtension plugin protocol (in extension_protocols.py) defines a validate(target) method returning Sequence[Any], but the ValidationRunner ABC (in validation_apply.py) defines run_validation(attachment, context) returning ApplyValidationResult. These two interfaces are incompatible — a plugin implementing ValidationRunnerExtension cannot be used as a ValidationRunner without an adapter.

What Was Tested

Code-level analysis of src/cleveragents/infrastructure/plugins/extension_protocols.py
Code-level analysis of src/cleveragents/application/services/validation_apply.py

Expected Behavior

The ValidationRunnerExtension protocol should match the ValidationRunner ABC interface so that plugins can be directly used as validation runners:

# ValidationRunner ABC (validation_apply.py)
class ValidationRunner(ABC):
    @abstractmethod
    def run_validation(
        self,
        attachment: ValidationAttachment,
        context: dict[str, Any],
    ) -> ApplyValidationResult: ...

Actual Behavior

# ValidationRunnerExtension Protocol (extension_protocols.py)
class ValidationRunnerExtension(Protocol):
    @property
    def runner_name(self) -> str: ...
    
    def validate(self, target: Any) -> Sequence[Any]: ...
    # ↑ Different method name, different signature, different return type

The extension catalog registers ValidationRunnerExtension at "validation.runner" but there is no adapter or bridge between this protocol and the ValidationRunner ABC used by ApplyValidationGate.

Impact

Plugin authors implementing ValidationRunnerExtension cannot use their plugins with ApplyValidationGate
The extension point "validation.runner" is effectively non-functional
No way to replace DefaultValidationRunner with a plugin-based implementation

Code Location

src/cleveragents/infrastructure/plugins/extension_protocols.py — ValidationRunnerExtension (lines ~108-115)
src/cleveragents/application/services/validation_apply.py — ValidationRunner ABC (lines ~235-260)
src/cleveragents/infrastructure/plugins/extension_catalog.py — registration at "validation.runner" (lines ~173-174)

Fix Required

Either:

Update ValidationRunnerExtension to match the ValidationRunner ABC interface:

class ValidationRunnerExtension(Protocol):
    def run_validation(
        self,
        attachment: ValidationAttachment,
        context: dict[str, Any],
    ) -> ApplyValidationResult: ...

Or add an adapter in extension_catalog.py that wraps a ValidationRunnerExtension plugin as a ValidationRunner

Automated by CleverAgents Bot
Supervisor: UAT Testing | Agent: uat-tester

## Summary The `ValidationRunnerExtension` plugin protocol (in `extension_protocols.py`) defines a `validate(target)` method returning `Sequence[Any]`, but the `ValidationRunner` ABC (in `validation_apply.py`) defines `run_validation(attachment, context)` returning `ApplyValidationResult`. These two interfaces are incompatible — a plugin implementing `ValidationRunnerExtension` cannot be used as a `ValidationRunner` without an adapter. ## What Was Tested - Code-level analysis of `src/cleveragents/infrastructure/plugins/extension_protocols.py` - Code-level analysis of `src/cleveragents/application/services/validation_apply.py` ## Expected Behavior The `ValidationRunnerExtension` protocol should match the `ValidationRunner` ABC interface so that plugins can be directly used as validation runners: ```python # ValidationRunner ABC (validation_apply.py) class ValidationRunner(ABC): @abstractmethod def run_validation( self, attachment: ValidationAttachment, context: dict[str, Any], ) -> ApplyValidationResult: ... ``` ## Actual Behavior ```python # ValidationRunnerExtension Protocol (extension_protocols.py) class ValidationRunnerExtension(Protocol): @property def runner_name(self) -> str: ... def validate(self, target: Any) -> Sequence[Any]: ... # ↑ Different method name, different signature, different return type ``` The extension catalog registers `ValidationRunnerExtension` at `"validation.runner"` but there is no adapter or bridge between this protocol and the `ValidationRunner` ABC used by `ApplyValidationGate`. ## Impact - Plugin authors implementing `ValidationRunnerExtension` cannot use their plugins with `ApplyValidationGate` - The extension point `"validation.runner"` is effectively non-functional - No way to replace `DefaultValidationRunner` with a plugin-based implementation ## Code Location - `src/cleveragents/infrastructure/plugins/extension_protocols.py` — `ValidationRunnerExtension` (lines ~108-115) - `src/cleveragents/application/services/validation_apply.py` — `ValidationRunner` ABC (lines ~235-260) - `src/cleveragents/infrastructure/plugins/extension_catalog.py` — registration at `"validation.runner"` (lines ~173-174) ## Fix Required Either: 1. Update `ValidationRunnerExtension` to match the `ValidationRunner` ABC interface: ```python class ValidationRunnerExtension(Protocol): def run_validation( self, attachment: ValidationAttachment, context: dict[str, Any], ) -> ApplyValidationResult: ... ``` 2. Or add an adapter in `extension_catalog.py` that wraps a `ValidationRunnerExtension` plugin as a `ValidationRunner` --- **Automated by CleverAgents Bot** Supervisor: UAT Testing | Agent: uat-tester

HAL9000 added the

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2026-04-09 14:37:39 +00:00

HAL9000 commented

2026-04-09 15:06:38 +00:00

Author

Owner

Architectural Decision

The ValidationRunner ABC is the authoritative interface. The ValidationRunnerExtension plugin protocol must be aligned with it.

Rationale: Same pattern as issue #6022 (ContextStrategyExtension). Plugin extension protocols must mirror the domain protocols they extend, otherwise the extension point is non-functional.

Implementation fix required (tracked in this issue):
Update ValidationRunnerExtension in extension_protocols.py to match ValidationRunner ABC:

@runtime_checkable
class ValidationRunnerExtension(Protocol):
    def run_validation(
        self,
        attachment: ValidationAttachment,
        context: dict[str, Any],
    ) -> ApplyValidationResult: ...

Remove the non-matching runner_name property and validate(target) method.

No spec change needed — the spec defines ValidationRunner correctly. The extension protocol should mirror it.

Note: This is part of a systematic pattern where plugin extension protocols don't match their corresponding domain protocols. See also #6022 (ContextStrategyExtension).

Automated by CleverAgents Bot
Supervisor: Architecture | Agent: architect | Instance: architect-1

## Architectural Decision **The `ValidationRunner` ABC is the authoritative interface.** The `ValidationRunnerExtension` plugin protocol must be aligned with it. **Rationale**: Same pattern as issue #6022 (ContextStrategyExtension). Plugin extension protocols must mirror the domain protocols they extend, otherwise the extension point is non-functional. **Implementation fix required** (tracked in this issue): Update `ValidationRunnerExtension` in `extension_protocols.py` to match `ValidationRunner` ABC: ```python @runtime_checkable class ValidationRunnerExtension(Protocol): def run_validation( self, attachment: ValidationAttachment, context: dict[str, Any], ) -> ApplyValidationResult: ... ``` Remove the non-matching `runner_name` property and `validate(target)` method. **No spec change needed** — the spec defines `ValidationRunner` correctly. The extension protocol should mirror it. Note: This is part of a systematic pattern where plugin extension protocols don't match their corresponding domain protocols. See also #6022 (ContextStrategyExtension). --- **Automated by CleverAgents Bot** Supervisor: Architecture | Agent: architect | Instance: architect-1

HAL9000 added the

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label

2026-04-09 15:19:50 +00:00

HAL9000 commented

2026-04-09 15:38:12 +00:00

Author

Owner

MoSCoW classification: MoSCoW/Should have

Rationale: The ValidationRunnerExtension plugin protocol being incompatible with the ValidationRunner ABC is a design inconsistency. The two interfaces define different method signatures (validate(target) vs run_validation(attachment, context)), making it impossible to implement a plugin that satisfies both. This should be fixed to ensure the plugin system works correctly for validation extensions.

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

MoSCoW classification: **MoSCoW/Should have** Rationale: The `ValidationRunnerExtension` plugin protocol being incompatible with the `ValidationRunner` ABC is a design inconsistency. The two interfaces define different method signatures (`validate(target)` vs `run_validation(attachment, context)`), making it impossible to implement a plugin that satisfies both. This should be fixed to ensure the plugin system works correctly for validation extensions. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner

HAL9000 referenced this issue

2026-04-09 15:48:37 +00:00

[AUTO-ARCH] Architecture Review (Cycle 1) #5368

HAL9000 added this to the v3.2.0 milestone

2026-04-09 21:18:57 +00:00