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feat(plugin): register spec-defined extension points in PluginManager #939

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opened 2026-03-14 01:16:56 +00:00 by freemo · 6 comments

freemo commented

2026-03-14 01:16:56 +00:00

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Background and Context

The specification defines 30 named extension points across the system (spec §Architecture > Extensibility, §Extension Points). These are the hooks where plugins and custom implementations can be registered to extend system behavior: context strategies, pipeline components, tool providers, output renderers, validation runners, skill providers, etc.

The current implementation in src/cleveragents/infrastructure/plugins/ (~40% complete) has:

PluginLoader — discovers and loads plugin modules from entry points
PluginManager — manages plugin lifecycle (register/unregister/list)
PluginDescriptor — plugin metadata model
ExtensionPointRegistry — generic registry for extension points

However, zero of the 30 spec-defined extension points are actually registered in the ExtensionPointRegistry. The infrastructure exists but no extension points are declared, meaning plugins have nowhere to hook into. The PluginManager.register_extension() method exists but is never called by the system to declare what can be extended.

Affected files

src/cleveragents/infrastructure/plugins/registry.py — ExtensionPointRegistry
src/cleveragents/infrastructure/plugins/manager.py — PluginManager
Various subsystems that should declare extension points (context, output, validation, tools, skills, etc.)

Expected Behavior

All 30 spec-defined extension points must be declared in the ExtensionPointRegistry with proper typing, and the relevant subsystems must query the registry for plugin-provided implementations.

Acceptance Criteria

All 30 spec-defined extension points registered in ExtensionPointRegistry:
- Context: context.strategy, context.pipeline_component (x10), context.storage_backend
- Output: output.renderer, output.materializer, output.format
- Validation: validation.runner, validation.rule_provider
- Tools: tool.provider, tool.middleware
- Skills: skill.provider, skill.template
- Resources: resource.resolver, resource.type_handler
- A2A: a2a.transport, a2a.extension_method
- Events: event.handler, event.filter
- Config: config.source, config.validator
- Safety: safety.guardrail
Each extension point has a typed protocol/interface definition
Subsystems query the registry for plugin-provided implementations at initialization
Plugin authors can register implementations via Python entry points
Extension point discovery: plugin list-extension-points CLI command

Metadata

Commit message: feat(plugin): register spec-defined extension points in PluginManager
Branch: feature/plugin-extension-points
Parent Epic: None (standalone feature)
Blocks: None
Blocked by: None

Subtasks

Define typed Protocol interfaces for each extension point category
Register all 30 extension points in ExtensionPointRegistry at app bootstrap
Wire context subsystem to query context.* extension points
Wire output subsystem to query output.* extension points
Wire validation subsystem to query validation.* extension points
Wire tool/skill/resource subsystems to query their extension points
Wire A2A subsystem to query a2a.* extension points
Implement plugin list-extension-points CLI command
Add documentation strings to each registered extension point
Tests (Behave): Add scenarios for plugin registration through entry points
Tests (Unit): Add tests for each extension point registration and lookup
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 30 spec-defined extension points are registered, typed, and discoverable, and at least one subsystem (context or output) queries the registry for plugin implementations.

## Background and Context The specification defines 30 named extension points across the system (spec §Architecture > Extensibility, §Extension Points). These are the hooks where plugins and custom implementations can be registered to extend system behavior: context strategies, pipeline components, tool providers, output renderers, validation runners, skill providers, etc. The current implementation in `src/cleveragents/infrastructure/plugins/` (~40% complete) has: - `PluginLoader` — discovers and loads plugin modules from entry points - `PluginManager` — manages plugin lifecycle (register/unregister/list) - `PluginDescriptor` — plugin metadata model - `ExtensionPointRegistry` — generic registry for extension points However, **zero** of the 30 spec-defined extension points are actually registered in the `ExtensionPointRegistry`. The infrastructure exists but no extension points are declared, meaning plugins have nowhere to hook into. The `PluginManager.register_extension()` method exists but is never called by the system to declare what can be extended. ### Affected files - `src/cleveragents/infrastructure/plugins/registry.py` — `ExtensionPointRegistry` - `src/cleveragents/infrastructure/plugins/manager.py` — `PluginManager` - Various subsystems that should declare extension points (context, output, validation, tools, skills, etc.) ## Expected Behavior All 30 spec-defined extension points must be declared in the `ExtensionPointRegistry` with proper typing, and the relevant subsystems must query the registry for plugin-provided implementations. ## Acceptance Criteria - [ ] All 30 spec-defined extension points registered in `ExtensionPointRegistry`: - Context: `context.strategy`, `context.pipeline_component` (x10), `context.storage_backend` - Output: `output.renderer`, `output.materializer`, `output.format` - Validation: `validation.runner`, `validation.rule_provider` - Tools: `tool.provider`, `tool.middleware` - Skills: `skill.provider`, `skill.template` - Resources: `resource.resolver`, `resource.type_handler` - A2A: `a2a.transport`, `a2a.extension_method` - Events: `event.handler`, `event.filter` - Config: `config.source`, `config.validator` - Safety: `safety.guardrail` - [ ] Each extension point has a typed protocol/interface definition - [ ] Subsystems query the registry for plugin-provided implementations at initialization - [ ] Plugin authors can register implementations via Python entry points - [ ] Extension point discovery: `plugin list-extension-points` CLI command ## Metadata - **Commit message**: `feat(plugin): register spec-defined extension points in PluginManager` - **Branch**: `feature/plugin-extension-points` - **Parent Epic**: None (standalone feature) - **Blocks**: None - **Blocked by**: None ## Subtasks - [ ] Define typed Protocol interfaces for each extension point category - [ ] Register all 30 extension points in `ExtensionPointRegistry` at app bootstrap - [ ] Wire context subsystem to query `context.*` extension points - [ ] Wire output subsystem to query `output.*` extension points - [ ] Wire validation subsystem to query `validation.*` extension points - [ ] Wire tool/skill/resource subsystems to query their extension points - [ ] Wire A2A subsystem to query `a2a.*` extension points - [ ] Implement `plugin list-extension-points` CLI command - [ ] Add documentation strings to each registered extension point - [ ] Tests (Behave): Add scenarios for plugin registration through entry points - [ ] Tests (Unit): Add tests for each extension point registration and lookup - [ ] 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 30 spec-defined extension points are registered, typed, and discoverable, and at least one subsystem (context or output) queries the registry for plugin implementations.

freemo added the

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2026-03-14 01:18:14 +00:00

freemo added this to the v3.6.0 milestone

2026-03-14 01:18:23 +00:00

freemo referenced this issue

2026-03-14 01:18:56 +00:00

Epic: ACMS Context Assembly Pipeline — Functional CRP Handlers and Pipeline Components #935

CoreRasurae was assigned by freemo

2026-03-14 04:27:30 +00:00

CoreRasurae added

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2026-03-31 03:05:18 +00:00

CoreRasurae referenced this issue from a commit

2026-03-31 03:58:49 +00:00

feat(plugin): register spec-defined extension points in PluginManager

CoreRasurae commented

2026-03-31 03:59:48 +00:00

Member

Implementation Notes — @CoreRasurae

Design Decisions

Protocol-based extension points: All 21 extension point interfaces are defined as @runtime_checkable Protocol classes in extension_protocols.py. This allows both static type checking (Pyright) and runtime isinstance() checks for plugin validation.
Catalog pattern: Extension point definitions are centralized in extension_catalog.py with a single register_all_extension_points() function called during app bootstrap. This keeps registration declarative and discoverable.
Optional PluginManager wiring: The ACMS pipeline accepts an Optional[PluginManager] parameter to maintain backward compatibility with existing code that doesn't inject a plugin manager.

Files Created/Modified

File	Purpose
`infrastructure.plugins.extension_protocols`	21 Protocol classes for extension point categories
`infrastructure.plugins.extension_catalog`	Registration catalog with 30 extension point definitions
`infrastructure.plugins.__init__`	New exports
`application.container`	Wired `register_all_extension_points()` at bootstrap
`application.services.acms_service`	Context subsystem extension point queries
`features/plugin_extension_points.feature`	38 Behave scenarios
`features/steps/plugin_extension_points_steps.py`	Step definitions with 21 stub implementations

Extension Point Categories (30 total)

Context: 12 (strategy, 10 pipeline components, storage backend)
Output: 3 (renderer, materializer, format)
Validation: 2 (runner, rule provider)
Tools: 2 (provider, middleware)
Skills: 2 (provider, template)
Resources: 2 (resolver, type handler)
A2A: 2 (transport, extension method)
Events: 2 (handler, filter)
Config: 2 (source, validator)
Safety: 1 (guardrail)

Quality Gate Results

lint: Passed (all checks passed)
typecheck: Passed (0 errors, 0 warnings)
unit_tests: Passed (13,023 scenarios, 0 failures)
coverage: 97.0% — COVERAGE OK

Commit

Branch: feature/plugin-extension-points
Commit: 3f5ca4e8 — feat(plugin): register spec-defined extension points in PluginManager

## Implementation Notes — @CoreRasurae ### Design Decisions 1. **Protocol-based extension points:** All 21 extension point interfaces are defined as `@runtime_checkable` Protocol classes in `extension_protocols.py`. This allows both static type checking (Pyright) and runtime isinstance() checks for plugin validation. 2. **Catalog pattern:** Extension point definitions are centralized in `extension_catalog.py` with a single `register_all_extension_points()` function called during app bootstrap. This keeps registration declarative and discoverable. 3. **Optional PluginManager wiring:** The ACMS pipeline accepts an `Optional[PluginManager]` parameter to maintain backward compatibility with existing code that doesn't inject a plugin manager. ### Files Created/Modified | File | Purpose | |------|---------| | `infrastructure.plugins.extension_protocols` | 21 Protocol classes for extension point categories | | `infrastructure.plugins.extension_catalog` | Registration catalog with 30 extension point definitions | | `infrastructure.plugins.__init__` | New exports | | `application.container` | Wired `register_all_extension_points()` at bootstrap | | `application.services.acms_service` | Context subsystem extension point queries | | `features/plugin_extension_points.feature` | 38 Behave scenarios | | `features/steps/plugin_extension_points_steps.py` | Step definitions with 21 stub implementations | ### Extension Point Categories (30 total) - Context: 12 (strategy, 10 pipeline components, storage backend) - Output: 3 (renderer, materializer, format) - Validation: 2 (runner, rule provider) - Tools: 2 (provider, middleware) - Skills: 2 (provider, template) - Resources: 2 (resolver, type handler) - A2A: 2 (transport, extension method) - Events: 2 (handler, filter) - Config: 2 (source, validator) - Safety: 1 (guardrail) ### Quality Gate Results - **lint**: Passed (all checks passed) - **typecheck**: Passed (0 errors, 0 warnings) - **unit_tests**: Passed (13,023 scenarios, 0 failures) - **coverage**: 97.0% — COVERAGE OK ### Commit Branch: `feature/plugin-extension-points` Commit: `3f5ca4e8` — `feat(plugin): register spec-defined extension points in PluginManager`

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

2026-03-31 03:59:54 +00:00

feat(plugin): register spec-defined extension points in PluginManager #1217

CoreRasurae added

and removed

labels

2026-03-31 04:00:02 +00:00

CoreRasurae was unassigned by freemo

2026-04-02 06:13:59 +00:00

freemo self-assigned this

2026-04-02 06:13:59 +00:00

freemo commented

2026-04-02 08:13:07 +00:00

Author

Owner

PR #1217 reviewed, approved, and merged.

All 30 spec-defined extension points are now registered in the ExtensionPointRegistry with typed Protocol interfaces. The ACMSPipeline context subsystem integration is wired and tested. 38 Behave scenarios pass covering registration, lookup, protocol conformance, and entry point discovery.

Minor follow-up items noted in the review (non-blocking):

Step file plugin_extension_points_steps.py exceeds 500-line guideline (787 lines) — stub classes could be extracted to features/mocks/
Two # noqa: E501 suppressions in extension_protocols.py could be resolved by wrapping long signatures
TOTAL_EXTENSION_POINTS constant could be derived from len(_EXTENSION_POINT_DEFS) instead of hardcoded

PR #1217 reviewed, approved, and merged. All 30 spec-defined extension points are now registered in the `ExtensionPointRegistry` with typed Protocol interfaces. The ACMSPipeline context subsystem integration is wired and tested. 38 Behave scenarios pass covering registration, lookup, protocol conformance, and entry point discovery. Minor follow-up items noted in the review (non-blocking): - Step file `plugin_extension_points_steps.py` exceeds 500-line guideline (787 lines) — stub classes could be extracted to `features/mocks/` - Two `# noqa: E501` suppressions in `extension_protocols.py` could be resolved by wrapping long signatures - `TOTAL_EXTENSION_POINTS` constant could be derived from `len(_EXTENSION_POINT_DEFS)` instead of hardcoded

freemo referenced this issue

2026-04-02 09:07:43 +00:00

fix(plugin): validate entry point module paths against allowlist before loading #1292

freemo commented

2026-04-02 09:08:21 +00:00

Author

Owner

Dependency notice: Issue #1292 — fix(plugin): validate entry point module paths against allowlist before loading — has been created as a child of this Epic. It addresses a security vulnerability in PluginLoader.load_from_entry_points where ep.load() is called before validating the module path against the _allowed_prefixes allowlist.

Per project conventions, #1292 blocks this Epic (#939).

**Dependency notice**: Issue #1292 — *fix(plugin): validate entry point module paths against allowlist before loading* — has been created as a child of this Epic. It addresses a security vulnerability in `PluginLoader.load_from_entry_points` where `ep.load()` is called before validating the module path against the `_allowed_prefixes` allowlist. Per project conventions, #1292 **blocks** this Epic (#939).

freemo commented

2026-04-02 16:51:26 +00:00

Author

Owner

PR #1217 reviewed, approved, and merge scheduled (will merge when CI checks pass).

Two independent reviews confirmed spec alignment (all 30 extension points), type safety, test quality (38 Behave scenarios), and correctness. Non-blocking follow-up items noted: step file size (787 lines, recommend extracting stubs to features/mocks/) and hardcoded TOTAL_EXTENSION_POINTS constant.

PR #1217 reviewed, approved, and merge scheduled (will merge when CI checks pass). Two independent reviews confirmed spec alignment (all 30 extension points), type safety, test quality (38 Behave scenarios), and correctness. Non-blocking follow-up items noted: step file size (787 lines, recommend extracting stubs to `features/mocks/`) and hardcoded `TOTAL_EXTENSION_POINTS` constant.

freemo closed this issue

2026-04-02 16:52:05 +00:00

freemo commented

2026-04-02 17:40:38 +00:00

Author

Owner

PR #1217 reviewed, approved, and merged. All 30 spec-defined extension points are now registered in the ExtensionPointRegistry with typed Protocol interfaces, and the context subsystem is wired to query context.* extension points.

PR #1217 reviewed, approved, and merged. All 30 spec-defined extension points are now registered in the `ExtensionPointRegistry` with typed Protocol interfaces, and the context subsystem is wired to query `context.*` extension points.

freemo added

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labels

2026-04-02 17:42:16 +00:00

freemo commented

2026-04-02 17:45:12 +00:00

Author

Owner

PR #1217 reviewed, approved, and merged. All 30 spec-defined extension points are now registered in the ExtensionPointRegistry with typed Protocol interfaces, completing the plugin extension infrastructure.

PR #1217 reviewed, approved, and merged. All 30 spec-defined extension points are now registered in the `ExtensionPointRegistry` with typed Protocol interfaces, completing the plugin extension infrastructure.