[LOW] Implement Plugin Architecture for Custom Tools and Extensions

[frankbria]

🎯 Overview

Build extensibility framework allowing users and developers to create custom plugins for specialized functionality.

✅ Acceptance Criteria

• Plugin SDK with documentation
• Plugin registration and discovery
• Sandboxed plugin execution for security
• Plugin versioning
• Plugin marketplace/directory
• Example plugins for reference
• Plugin testing framework
• Plugin analytics and usage tracking

🏗️ Technical Requirements

• Backend: Plugin framework with isolated execution
• Plugin API specification
• Security sandboxing (containers or process isolation)
• Plugin manifest format
• Frontend: Plugin manager UI
• Endpoints: POST/GET /api/plugins

🏷️ Labels

`low-priority`, `backend`, `frontend`, `extensibility`, `architecture`

⏱️ Estimated Effort

6-8 weeks

[traycerai]

Plan

Observations

The codebase is a well-structured monorepo with FastAPI backend, Next.js frontend, and an existing MCP server component. The architecture already demonstrates extensibility patterns through the feature store service (file:apps/backend/app/services/feature_store_service.py) and modular route structure. The product requirements document explicitly mentions an AI-orchestrated tool architecture with standardized interfaces, providing a foundation for plugin development. Docker-based deployment with MongoDB and Redis is established, making containerized plugin execution feasible. The middleware system (file:apps/backend/app/middleware/) and service layer pattern provide clear integration points for plugin functionality.

Approach

The implementation will leverage the existing MCP server architecture and service layer patterns to build a comprehensive plugin system. The approach focuses on creating a standardized plugin interface similar to the existing ModelingTool concept mentioned in the product requirements, with a plugin registry service for discovery and management. Security will be achieved through Docker container isolation for plugin execution, building on the existing containerization infrastructure. The frontend will feature a dedicated plugin manager UI integrated with the existing component architecture. The implementation prioritizes backward compatibility and follows established patterns for routes, services, and models to ensure seamless integration with the current codebase.

Implementation Steps

1. Backend Plugin Framework

1.1 Plugin Core Models and Schema

Create plugin data models in file:apps/backend/app/models/plugin.py:

• Plugin document model with fields: plugin_id, name, version, description, author, category, manifest, status (active/inactive/deprecated), installation_date, last_updated, configuration, permissions, dependencies
• PluginVersion document model for version history tracking
• PluginExecution document model for tracking plugin runs with execution_id, plugin_id, user_id, input_data, output_data, status, start_time, end_time, error_logs
• PluginAnalytics document model for usage tracking with metrics like execution_count, success_rate, avg_execution_time, user_count

Create plugin manifest schema in file:apps/backend/app/schemas/plugin_manifest.py:

• Define Pydantic models for plugin manifest structure including metadata, entry_point, dependencies, permissions_required, api_version, hooks (lifecycle hooks), configuration_schema
• Include validation for semantic versioning
• Define capability declarations (data_processing, model_training, visualization, export, etc.)

1.2 Plugin Service Layer

Create file:apps/backend/app/services/plugin_service.py:

• PluginService class with methods:
  • register_plugin(manifest_data, user_id): Validate and register new plugin
  • discover_plugins(): Scan plugin directory and auto-discover available plugins
  • get_plugin(plugin_id, version=None): Retrieve plugin by ID with optional version
  • list_plugins(filters, user_id): List available plugins with filtering by category, author, status
  • update_plugin(plugin_id, updates, user_id): Update plugin metadata or configuration
  • uninstall_plugin(plugin_id, user_id): Soft delete plugin
  • validate_manifest(manifest): Validate plugin manifest against schema
  • check_dependencies(plugin_id): Verify plugin dependencies are satisfied
  • get_plugin_permissions(plugin_id): Return required permissions for plugin

Create file:apps/backend/app/services/plugin_execution_service.py:

• PluginExecutionService class with methods:
  • execute_plugin(plugin_id, input_data, user_id, config={}): Execute plugin in isolated environment
  • get_execution_status(execution_id): Check execution progress
  • cancel_execution(execution_id, user_id): Stop running plugin
  • get_execution_logs(execution_id, user_id): Retrieve execution logs
  • cleanup_execution(execution_id): Clean up resources after execution
• Implement async execution with progress callbacks
• Use Redis for execution queue management
• Implement timeout handling (30 minutes max as per product requirements)

Create file:apps/backend/app/services/plugin_sandbox_service.py:

• PluginSandboxService class for containerized execution:
  • create_sandbox(plugin_id): Create isolated Docker container for plugin
  • execute_in_sandbox(container_id, plugin_code, input_data): Run plugin code in container
  • destroy_sandbox(container_id): Clean up container resources
  • monitor_resources(container_id): Track CPU, memory, disk usage
  • enforce_limits(): Apply resource limits (memory, CPU, network)
• Use Docker SDK for Python to manage containers
• Implement network isolation and filesystem restrictions
• Mount read-only volumes for plugin code

1.3 Plugin Analytics Service

Create file:apps/backend/app/services/plugin_analytics_service.py:

• PluginAnalyticsService class with methods:
  • track_execution(plugin_id, execution_data): Record plugin execution metrics
  • get_plugin_stats(plugin_id, time_range): Retrieve usage statistics
  • get_popular_plugins(limit=10): Return most-used plugins
  • get_user_plugin_usage(user_id): Track user's plugin usage patterns
  • generate_analytics_report(plugin_id): Create comprehensive analytics report
• Integrate with existing Prometheus metrics in file:apps/backend/app/middleware/metrics.py

1.4 Plugin API Routes

Create file:apps/backend/app/api/routes/plugins.py:

• POST /api/v1/plugins - Register new plugin (admin only)
• GET /api/v1/plugins - List available plugins with search and filtering
• GET /api/v1/plugins/{plugin_id} - Get plugin details
• PUT /api/v1/plugins/{plugin_id} - Update plugin configuration
• DELETE /api/v1/plugins/{plugin_id} - Uninstall plugin
• POST /api/v1/plugins/{plugin_id}/execute - Execute plugin
• GET /api/v1/plugins/{plugin_id}/executions - List plugin execution history
• GET /api/v1/plugins/executions/{execution_id} - Get execution details
• POST /api/v1/plugins/executions/{execution_id}/cancel - Cancel execution
• GET /api/v1/plugins/{plugin_id}/analytics - Get plugin analytics
• GET /api/v1/plugins/marketplace - Browse plugin marketplace
• POST /api/v1/plugins/{plugin_id}/install - Install plugin from marketplace

Follow the pattern established in file:apps/backend/app/api/routes/feature_store.py for request/response schemas and error handling.

Register routes in file:apps/backend/app/main.py by adding:

from app.api.routes import plugins
app.include_router(
    plugins.router,
    prefix=f"{settings.API_V1_STR}/plugins",
    tags=["plugins"]
)

1.5 Plugin Security and Permissions

Create file:apps/backend/app/services/plugin_security_service.py:

• PluginSecurityService class with methods:
  • validate_permissions(plugin_id, user_id): Check if user has permission to use plugin
  • scan_plugin_code(plugin_code): Static analysis for security vulnerabilities
  • validate_signature(plugin_package): Verify plugin package signature
  • check_malicious_patterns(code): Scan for suspicious code patterns
  • audit_plugin_access(plugin_id, user_id, action): Log security events
• Implement role-based access control (RBAC) for plugin management
• Integrate with existing auth system in file:apps/backend/app/auth/nextauth_auth.py

Create middleware in file:apps/backend/app/middleware/plugin_auth.py:

• Verify plugin API key authentication
• Rate limiting for plugin executions
• Request validation and sanitization

2. Plugin SDK Development

2.1 Base Plugin Interface

Create file:apps/backend/app/plugins/base.py:

• BasePlugin abstract class with methods:
  • validate_inputs(data): Validate input data structure
  • execute(data, config): Main execution logic (abstract)
  • get_progress(): Return execution progress (0-100)
  • get_results(): Return execution results
  • explain_parameters(): Return parameter documentation
  • on_install(): Lifecycle hook for installation
  • on_uninstall(): Lifecycle hook for cleanup
  • on_error(error): Error handling hook
• Include helper methods for common operations (data loading, result formatting)
• Provide logging utilities that integrate with backend logging

2.2 Plugin Development Kit

Create file:apps/backend/app/plugins/sdk/ directory with:

• plugin_sdk.py: Main SDK module with utilities for plugin developers
  • PluginContext class providing access to data, configuration, logging
  • PluginResult class for standardized result formatting
  • Helper functions for data validation, type conversion, error handling
• decorators.py: Decorators for plugin methods (@validate_input, @track_progress, @handle_errors)
• exceptions.py: Custom exception classes for plugin errors
• testing.py: Testing utilities for plugin developers

Create plugin template in file:apps/backend/app/plugins/templates/:

• example_plugin/ directory with:
  • manifest.json: Example manifest file
  • plugin.py: Example plugin implementation
  • requirements.txt: Python dependencies
  • README.md: Plugin documentation template
  • tests/: Example test files

2.3 Plugin Documentation

Create file:docs/plugins/PLUGIN_DEVELOPMENT_GUIDE.md:

• Getting started with plugin development
• Plugin architecture overview
• Step-by-step tutorial for creating first plugin
• API reference for BasePlugin class
• Best practices and design patterns
• Security guidelines
• Testing strategies
• Deployment instructions

Create file:docs/plugins/PLUGIN_API_REFERENCE.md:

• Complete API documentation for plugin SDK
• Method signatures and parameters
• Return types and data structures
• Code examples for common use cases
• Integration with existing services

3. Plugin Execution Infrastructure

3.1 Docker Container Setup

Create file:apps/backend/Dockerfile.plugin:

• Base image with Python runtime and required dependencies
• Security hardening (non-root user, minimal packages)
• Resource limits configuration
• Network isolation settings
• Volume mount points for plugin code and data

Create file:apps/backend/docker-compose.plugins.yml:

• Plugin execution service configuration
• Network isolation setup
• Volume management for plugin storage
• Resource limits (CPU, memory)
• Health check configuration

3.2 Plugin Registry and Discovery

Create file:apps/backend/app/services/plugin_registry.py:

• PluginRegistry singleton class with methods:
  • register(plugin_class): Register plugin class
  • get(plugin_id): Retrieve plugin by ID
  • list_all(): List all registered plugins
  • search(query, filters): Search plugins by name, category, tags
  • get_by_capability(capability): Find plugins by capability
• Implement plugin loading from filesystem
• Support hot-reloading for development

Create plugin storage structure:

• file:apps/backend/plugins/ directory for installed plugins
• Each plugin in subdirectory: plugins/{plugin_id}/{version}/
• Manifest file: plugins/{plugin_id}/{version}/manifest.json
• Plugin code: plugins/{plugin_id}/{version}/plugin.py

3.3 Plugin Versioning System

Extend file:apps/backend/app/services/versioning_service.py:

• Add plugin versioning support
• Track plugin version history
• Handle version conflicts and dependencies
• Support rollback to previous versions
• Implement semantic versioning validation

4. Frontend Plugin Manager UI

4.1 Plugin Management Components

Create file:apps/frontend/components/plugins/PluginManager.tsx:

• Main plugin manager interface
• Tabs for: Installed, Available, Marketplace
• Search and filter functionality
• Plugin cards with name, description, version, author, rating
• Install/uninstall buttons with confirmation dialogs

Create file:apps/frontend/components/plugins/PluginCard.tsx:

• Display plugin information
• Show installation status
• Action buttons (Install, Configure, Uninstall, View Details)
• Usage statistics display
• Version selector dropdown

Create file:apps/frontend/components/plugins/PluginDetails.tsx:

• Detailed plugin information modal
• Description, documentation, changelog
• Configuration options
• Permissions required
• Dependencies list
• User reviews and ratings

Create file:apps/frontend/components/plugins/PluginConfiguration.tsx:

• Dynamic form generation based on plugin configuration schema
• Input validation
• Save/reset configuration
• Test configuration button

Create file:apps/frontend/components/plugins/PluginExecutionMonitor.tsx:

• Real-time execution progress display
• Log viewer with filtering
• Cancel execution button
• Execution history table
• Result visualization

4.2 Plugin Marketplace UI

Create file:apps/frontend/components/plugins/PluginMarketplace.tsx:

• Browse available plugins
• Category navigation
• Featured plugins section
• Search with autocomplete
• Sort by popularity, rating, recent
• Plugin preview cards

Create file:apps/frontend/components/plugins/PluginReview.tsx:

• Display user reviews
• Rating system (1-5 stars)
• Review submission form
• Helpful/not helpful voting

4.3 Plugin Integration Points

Update file:apps/frontend/components/Sidebar.tsx:

• Add "Plugins" menu item
• Show plugin count badge
• Quick access to recently used plugins

Create plugin hooks in file:apps/frontend/lib/hooks/usePlugins.ts:

• usePluginList(): Fetch and cache plugin list
• usePluginExecution(): Execute plugin and track progress
• usePluginAnalytics(): Fetch plugin usage statistics
• usePluginInstall(): Handle plugin installation

Create plugin service in file:apps/frontend/lib/services/pluginService.ts:

• API client methods for plugin endpoints
• Error handling and retry logic
• Response caching
• WebSocket connection for real-time updates

4.4 Plugin Settings Page

Create file:apps/frontend/app/plugins/page.tsx:

• Main plugin management page
• Integrate PluginManager component
• Add breadcrumb navigation
• Include help documentation link

Create file:apps/frontend/app/plugins/[pluginId]/page.tsx:

• Individual plugin detail page
• Configuration interface
• Execution history
• Analytics dashboard

5. Plugin Testing Framework

5.1 Backend Plugin Tests

Create file:apps/backend/tests/test_plugins/:

• test_plugin_service.py: Test plugin registration, discovery, CRUD operations
• test_plugin_execution.py: Test plugin execution, cancellation, error handling
• test_plugin_sandbox.py: Test container isolation, resource limits
• test_plugin_security.py: Test permission validation, code scanning
• conftest.py: Pytest fixtures for plugin testing

Create file:apps/backend/tests/test_plugins/fixtures/:

• Sample plugin implementations for testing
• Mock plugin manifests
• Test data files

5.2 Plugin SDK Tests

Create file:apps/backend/app/plugins/sdk/tests/:

• test_base_plugin.py: Test BasePlugin interface
• test_plugin_context.py: Test PluginContext functionality
• test_decorators.py: Test plugin decorators
• test_validation.py: Test input validation

5.3 Frontend Plugin Tests

Create file:apps/frontend/__tests__/plugins/:

• PluginManager.test.tsx: Test plugin manager UI
• PluginCard.test.tsx: Test plugin card component
• PluginExecution.test.tsx: Test execution monitoring
• Mock plugin API responses

Create file:apps/frontend/e2e/plugins/:

• plugin-installation.spec.ts: E2E test for plugin installation flow
• plugin-execution.spec.ts: E2E test for plugin execution
• plugin-configuration.spec.ts: E2E test for plugin configuration

6. Example Plugins

6.1 Data Processing Plugin

Create file:apps/backend/plugins/examples/data_cleaner/:

• Manifest with data processing capability
• Plugin implementation for common data cleaning tasks
• Configuration schema for cleaning options
• Unit tests

6.2 Visualization Plugin

Create file:apps/backend/plugins/examples/custom_charts/:

• Manifest with visualization capability
• Plugin for generating custom chart types
• Configuration for chart customization
• Example outputs

6.3 Model Training Plugin

Create file:apps/backend/plugins/examples/custom_model/:

• Manifest with model training capability
• Plugin implementing custom ML algorithm
• Hyperparameter configuration
• Model evaluation metrics

7. Plugin Marketplace Backend

7.1 Marketplace Service

Create file:apps/backend/app/services/plugin_marketplace_service.py:

• PluginMarketplaceService class with methods:
  • publish_plugin(plugin_id, user_id): Submit plugin to marketplace
  • approve_plugin(plugin_id, admin_id): Admin approval workflow
  • search_marketplace(query, filters): Search published plugins
  • get_featured_plugins(): Return curated plugin list
  • submit_review(plugin_id, user_id, rating, comment): Add plugin review
  • get_plugin_reviews(plugin_id): Fetch plugin reviews
  • download_plugin(plugin_id, user_id): Track downloads

7.2 Marketplace Models

Extend file:apps/backend/app/models/plugin.py:

• PluginListing model for marketplace entries
• PluginReview model for user reviews
• PluginDownload model for tracking downloads
• Fields: listing_status (pending/approved/rejected), featured, download_count, rating_average

8. Documentation and Developer Resources

8.1 User Documentation

Create file:docs/plugins/USER_GUIDE.md:

• How to browse and install plugins
• Plugin configuration guide
• Executing plugins
• Troubleshooting common issues
• Security best practices

8.2 API Documentation

Update file:apps/backend/app/services/api_documentation.py:

• Add plugin endpoints to OpenAPI spec
• Include request/response examples
• Document authentication requirements
• Add plugin execution workflow diagrams

8.3 Example Projects

Create file:examples/plugins/:

• simple_plugin/: Minimal plugin example
• data_transformer/: Data processing plugin
• ml_model/: Machine learning plugin
• visualization/: Custom visualization plugin
• Each with complete documentation and tests

9. Monitoring and Analytics

9.1 Plugin Metrics

Extend file:apps/backend/app/middleware/metrics.py:

• Add Prometheus metrics for plugins:
  • plugin_executions_total: Counter for plugin executions
  • plugin_execution_duration_seconds: Histogram for execution time
  • plugin_errors_total: Counter for plugin errors
  • active_plugin_executions: Gauge for concurrent executions
  • plugin_resource_usage: Gauge for CPU/memory usage

9.2 Plugin Dashboard

Create file:apps/frontend/app/admin/plugins/page.tsx:

• Admin dashboard for plugin management
• Plugin approval workflow
• Usage analytics visualization
• System health monitoring
• Resource usage graphs

10. Security Hardening

10.1 Code Scanning

Integrate static analysis tools:

• Use bandit for Python security scanning
• Implement in file:apps/backend/app/services/plugin_security_service.py
• Scan for common vulnerabilities (SQL injection, command injection, etc.)
• Block plugins with security issues

10.2 Sandboxing Configuration

Create file:apps/backend/app/config/plugin_sandbox_config.py:

• Define resource limits (CPU: 2 cores, Memory: 4GB, Disk: 10GB)
• Network policies (no external network access by default)
• Filesystem restrictions (read-only except temp directory)
• Execution timeout (30 minutes)
• Allowed system calls whitelist

10.3 Audit Logging

Extend file:apps/backend/app/services/monitoring.py:

• Log all plugin operations (install, execute, configure, uninstall)
• Track user actions with timestamps
• Store audit logs in MongoDB
• Implement log retention policy
• Create audit report generation

Architecture Diagram

sequenceDiagram
    participant User
    participant Frontend
    participant PluginAPI
    participant PluginService
    participant SandboxService
    participant Docker
    participant MongoDB
    participant Redis

    User->>Frontend: Browse Plugins
    Frontend->>PluginAPI: GET /api/v1/plugins
    PluginAPI->>PluginService: list_plugins()
    PluginService->>MongoDB: Query plugins
    MongoDB-->>PluginService: Plugin list
    PluginService-->>PluginAPI: Return plugins
    PluginAPI-->>Frontend: Plugin data
    Frontend-->>User: Display plugins

    User->>Frontend: Install Plugin
    Frontend->>PluginAPI: POST /api/v1/plugins/{id}/install
    PluginAPI->>PluginService: register_plugin()
    PluginService->>PluginService: validate_manifest()
    PluginService->>MongoDB: Save plugin
    PluginService-->>PluginAPI: Installation success
    PluginAPI-->>Frontend: Success response
    Frontend-->>User: Show confirmation

    User->>Frontend: Execute Plugin
    Frontend->>PluginAPI: POST /api/v1/plugins/{id}/execute
    PluginAPI->>PluginService: execute_plugin()
    PluginService->>Redis: Queue execution
    PluginService->>SandboxService: create_sandbox()
    SandboxService->>Docker: Create container
    Docker-->>SandboxService: Container ID
    SandboxService->>Docker: Execute plugin code
    Docker-->>SandboxService: Execution results
    SandboxService->>Docker: Destroy container
    SandboxService-->>PluginService: Results
    PluginService->>MongoDB: Save execution record
    PluginService-->>PluginAPI: Return results
    PluginAPI-->>Frontend: Execution complete
    Frontend-->>User: Display results

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Component Relationships

graph TD
    A[Plugin Manager UI] --> B[Plugin API Routes]
    B --> C[Plugin Service]
    B --> D[Plugin Execution Service]
    B --> E[Plugin Marketplace Service]
    
    C --> F[Plugin Registry]
    C --> G[MongoDB - Plugins]
    
    D --> H[Plugin Sandbox Service]
    D --> I[Redis - Execution Queue]
    
    H --> J[Docker Containers]
    
    E --> K[Plugin Analytics Service]
    K --> L[Prometheus Metrics]
    
    M[Plugin SDK] --> N[Base Plugin Class]
    N --> O[Example Plugins]
    
    P[Plugin Security Service] --> C
    P --> D
    
    Q[Plugin Testing Framework] --> M
    Q --> O

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Implementation Summary

Component	Files	Dependencies
Plugin Models	models/plugin.py	Beanie, MongoDB
Plugin Services	services/plugin_service.py, services/plugin_execution_service.py, services/plugin_sandbox_service.py	Docker SDK, Redis, MongoDB
Plugin API	api/routes/plugins.py	FastAPI, Plugin Services
Plugin SDK	plugins/base.py, plugins/sdk/	Python standard library
Frontend UI	components/plugins/, app/plugins/	React, Next.js, Axios
Security	services/plugin_security_service.py, middleware/plugin_auth.py	Bandit, Docker
Testing	tests/test_plugins/, e2e/plugins/	Pytest, Playwright
Documentation	docs/plugins/	Markdown

Import In IDE

🤖 Prompt for AI Agents

## Observations

The codebase is a well-structured monorepo with FastAPI backend, Next.js frontend, and an existing MCP server component. The architecture already demonstrates extensibility patterns through the feature store service (`file:apps/backend/app/services/feature_store_service.py`) and modular route structure. The product requirements document explicitly mentions an AI-orchestrated tool architecture with standardized interfaces, providing a foundation for plugin development. Docker-based deployment with MongoDB and Redis is established, making containerized plugin execution feasible. The middleware system (`file:apps/backend/app/middleware/`) and service layer pattern provide clear integration points for plugin functionality.

## Approach

The implementation will leverage the existing MCP server architecture and service layer patterns to build a comprehensive plugin system. The approach focuses on creating a standardized plugin interface similar to the existing `ModelingTool` concept mentioned in the product requirements, with a plugin registry service for discovery and management. Security will be achieved through Docker container isolation for plugin execution, building on the existing containerization infrastructure. The frontend will feature a dedicated plugin manager UI integrated with the existing component architecture. The implementation prioritizes backward compatibility and follows established patterns for routes, services, and models to ensure seamless integration with the current codebase.

## Implementation Steps

### 1. Backend Plugin Framework

#### 1.1 Plugin Core Models and Schema

Create plugin data models in `file:apps/backend/app/models/plugin.py`:
- `Plugin` document model with fields: plugin_id, name, version, description, author, category, manifest, status (active/inactive/deprecated), installation_date, last_updated, configuration, permissions, dependencies
- `PluginVersion` document model for version history tracking
- `PluginExecution` document model for tracking plugin runs with execution_id, plugin_id, user_id, input_data, output_data, status, start_time, end_time, error_logs
- `PluginAnalytics` document model for usage tracking with metrics like execution_count, success_rate, avg_execution_time, user_count

Create plugin manifest schema in `file:apps/backend/app/schemas/plugin_manifest.py`:
- Define Pydantic models for plugin manifest structure including metadata, entry_point, dependencies, permissions_required, api_version, hooks (lifecycle hooks), configuration_schema
- Include validation for semantic versioning
- Define capability declarations (data_processing, model_training, visualization, export, etc.)

#### 1.2 Plugin Service Layer

Create `file:apps/backend/app/services/plugin_service.py`:
- `PluginService` class with methods:
  - `register_plugin(manifest_data, user_id)`: Validate and register new plugin
  - `discover_plugins()`: Scan plugin directory and auto-discover available plugins
  - `get_plugin(plugin_id, version=None)`: Retrieve plugin by ID with optional version
  - `list_plugins(filters, user_id)`: List available plugins with filtering by category, author, status
  - `update_plugin(plugin_id, updates, user_id)`: Update plugin metadata or configuration
  - `uninstall_plugin(plugin_id, user_id)`: Soft delete plugin
  - `validate_manifest(manifest)`: Validate plugin manifest against schema
  - `check_dependencies(plugin_id)`: Verify plugin dependencies are satisfied
  - `get_plugin_permissions(plugin_id)`: Return required permissions for plugin

Create `file:apps/backend/app/services/plugin_execution_service.py`:
- `PluginExecutionService` class with methods:
  - `execute_plugin(plugin_id, input_data, user_id, config={})`: Execute plugin in isolated environment
  - `get_execution_status(execution_id)`: Check execution progress
  - `cancel_execution(execution_id, user_id)`: Stop running plugin
  - `get_execution_logs(execution_id, user_id)`: Retrieve execution logs
  - `cleanup_execution(execution_id)`: Clean up resources after execution
- Implement async execution with progress callbacks
- Use Redis for execution queue management
- Implement timeout handling (30 minutes max as per product requirements)

Create `file:apps/backend/app/services/plugin_sandbox_service.py`:
- `PluginSandboxService` class for containerized execution:
  - `create_sandbox(plugin_id)`: Create isolated Docker container for plugin
  - `execute_in_sandbox(container_id, plugin_code, input_data)`: Run plugin code in container
  - `destroy_sandbox(container_id)`: Clean up container resources
  - `monitor_resources(container_id)`: Track CPU, memory, disk usage
  - `enforce_limits()`: Apply resource limits (memory, CPU, network)
- Use Docker SDK for Python to manage containers
- Implement network isolation and filesystem restrictions
- Mount read-only volumes for plugin code

#### 1.3 Plugin Analytics Service

Create `file:apps/backend/app/services/plugin_analytics_service.py`:
- `PluginAnalyticsService` class with methods:
  - `track_execution(plugin_id, execution_data)`: Record plugin execution metrics
  - `get_plugin_stats(plugin_id, time_range)`: Retrieve usage statistics
  - `get_popular_plugins(limit=10)`: Return most-used plugins
  - `get_user_plugin_usage(user_id)`: Track user's plugin usage patterns
  - `generate_analytics_report(plugin_id)`: Create comprehensive analytics report
- Integrate with existing Prometheus metrics in `file:apps/backend/app/middleware/metrics.py`

#### 1.4 Plugin API Routes

Create `file:apps/backend/app/api/routes/plugins.py`:
- `POST /api/v1/plugins` - Register new plugin (admin only)
- `GET /api/v1/plugins` - List available plugins with search and filtering
- `GET /api/v1/plugins/{plugin_id}` - Get plugin details
- `PUT /api/v1/plugins/{plugin_id}` - Update plugin configuration
- `DELETE /api/v1/plugins/{plugin_id}` - Uninstall plugin
- `POST /api/v1/plugins/{plugin_id}/execute` - Execute plugin
- `GET /api/v1/plugins/{plugin_id}/executions` - List plugin execution history
- `GET /api/v1/plugins/executions/{execution_id}` - Get execution details
- `POST /api/v1/plugins/executions/{execution_id}/cancel` - Cancel execution
- `GET /api/v1/plugins/{plugin_id}/analytics` - Get plugin analytics
- `GET /api/v1/plugins/marketplace` - Browse plugin marketplace
- `POST /api/v1/plugins/{plugin_id}/install` - Install plugin from marketplace

Follow the pattern established in `file:apps/backend/app/api/routes/feature_store.py` for request/response schemas and error handling.

Register routes in `file:apps/backend/app/main.py` by adding:
```python
from app.api.routes import plugins
app.include_router(
    plugins.router,
    prefix=f"{settings.API_V1_STR}/plugins",
    tags=["plugins"]
)
```

#### 1.5 Plugin Security and Permissions

Create `file:apps/backend/app/services/plugin_security_service.py`:
- `PluginSecurityService` class with methods:
  - `validate_permissions(plugin_id, user_id)`: Check if user has permission to use plugin
  - `scan_plugin_code(plugin_code)`: Static analysis for security vulnerabilities
  - `validate_signature(plugin_package)`: Verify plugin package signature
  - `check_malicious_patterns(code)`: Scan for suspicious code patterns
  - `audit_plugin_access(plugin_id, user_id, action)`: Log security events
- Implement role-based access control (RBAC) for plugin management
- Integrate with existing auth system in `file:apps/backend/app/auth/nextauth_auth.py`

Create middleware in `file:apps/backend/app/middleware/plugin_auth.py`:
- Verify plugin API key authentication
- Rate limiting for plugin executions
- Request validation and sanitization

### 2. Plugin SDK Development

#### 2.1 Base Plugin Interface

Create `file:apps/backend/app/plugins/base.py`:
- `BasePlugin` abstract class with methods:
  - `validate_inputs(data)`: Validate input data structure
  - `execute(data, config)`: Main execution logic (abstract)
  - `get_progress()`: Return execution progress (0-100)
  - `get_results()`: Return execution results
  - `explain_parameters()`: Return parameter documentation
  - `on_install()`: Lifecycle hook for installation
  - `on_uninstall()`: Lifecycle hook for cleanup
  - `on_error(error)`: Error handling hook
- Include helper methods for common operations (data loading, result formatting)
- Provide logging utilities that integrate with backend logging

#### 2.2 Plugin Development Kit

Create `file:apps/backend/app/plugins/sdk/` directory with:
- `plugin_sdk.py`: Main SDK module with utilities for plugin developers
  - `PluginContext` class providing access to data, configuration, logging
  - `PluginResult` class for standardized result formatting
  - Helper functions for data validation, type conversion, error handling
- `decorators.py`: Decorators for plugin methods (@validate_input, @track_progress, @handle_errors)
- `exceptions.py`: Custom exception classes for plugin errors
- `testing.py`: Testing utilities for plugin developers

Create plugin template in `file:apps/backend/app/plugins/templates/`:
- `example_plugin/` directory with:
  - `manifest.json`: Example manifest file
  - `plugin.py`: Example plugin implementation
  - `requirements.txt`: Python dependencies
  - `README.md`: Plugin documentation template
  - `tests/`: Example test files

#### 2.3 Plugin Documentation

Create `file:docs/plugins/PLUGIN_DEVELOPMENT_GUIDE.md`:
- Getting started with plugin development
- Plugin architecture overview
- Step-by-step tutorial for creating first plugin
- API reference for BasePlugin class
- Best practices and design patterns
- Security guidelines
- Testing strategies
- Deployment instructions

Create `file:docs/plugins/PLUGIN_API_REFERENCE.md`:
- Complete API documentation for plugin SDK
- Method signatures and parameters
- Return types and data structures
- Code examples for common use cases
- Integration with existing services

### 3. Plugin Execution Infrastructure

#### 3.1 Docker Container Setup

Create `file:apps/backend/Dockerfile.plugin`:
- Base image with Python runtime and required dependencies
- Security hardening (non-root user, minimal packages)
- Resource limits configuration
- Network isolation settings
- Volume mount points for plugin code and data

Create `file:apps/backend/docker-compose.plugins.yml`:
- Plugin execution service configuration
- Network isolation setup
- Volume management for plugin storage
- Resource limits (CPU, memory)
- Health check configuration

#### 3.2 Plugin Registry and Discovery

Create `file:apps/backend/app/services/plugin_registry.py`:
- `PluginRegistry` singleton class with methods:
  - `register(plugin_class)`: Register plugin class
  - `get(plugin_id)`: Retrieve plugin by ID
  - `list_all()`: List all registered plugins
  - `search(query, filters)`: Search plugins by name, category, tags
  - `get_by_capability(capability)`: Find plugins by capability
- Implement plugin loading from filesystem
- Support hot-reloading for development

Create plugin storage structure:
- `file:apps/backend/plugins/` directory for installed plugins
- Each plugin in subdirectory: `plugins/{plugin_id}/{version}/`
- Manifest file: `plugins/{plugin_id}/{version}/manifest.json`
- Plugin code: `plugins/{plugin_id}/{version}/plugin.py`

#### 3.3 Plugin Versioning System

Extend `file:apps/backend/app/services/versioning_service.py`:
- Add plugin versioning support
- Track plugin version history
- Handle version conflicts and dependencies
- Support rollback to previous versions
- Implement semantic versioning validation

### 4. Frontend Plugin Manager UI

#### 4.1 Plugin Management Components

Create `file:apps/frontend/components/plugins/PluginManager.tsx`:
- Main plugin manager interface
- Tabs for: Installed, Available, Marketplace
- Search and filter functionality
- Plugin cards with name, description, version, author, rating
- Install/uninstall buttons with confirmation dialogs

Create `file:apps/frontend/components/plugins/PluginCard.tsx`:
- Display plugin information
- Show installation status
- Action buttons (Install, Configure, Uninstall, View Details)
- Usage statistics display
- Version selector dropdown

Create `file:apps/frontend/components/plugins/PluginDetails.tsx`:
- Detailed plugin information modal
- Description, documentation, changelog
- Configuration options
- Permissions required
- Dependencies list
- User reviews and ratings

Create `file:apps/frontend/components/plugins/PluginConfiguration.tsx`:
- Dynamic form generation based on plugin configuration schema
- Input validation
- Save/reset configuration
- Test configuration button

Create `file:apps/frontend/components/plugins/PluginExecutionMonitor.tsx`:
- Real-time execution progress display
- Log viewer with filtering
- Cancel execution button
- Execution history table
- Result visualization

#### 4.2 Plugin Marketplace UI

Create `file:apps/frontend/components/plugins/PluginMarketplace.tsx`:
- Browse available plugins
- Category navigation
- Featured plugins section
- Search with autocomplete
- Sort by popularity, rating, recent
- Plugin preview cards

Create `file:apps/frontend/components/plugins/PluginReview.tsx`:
- Display user reviews
- Rating system (1-5 stars)
- Review submission form
- Helpful/not helpful voting

#### 4.3 Plugin Integration Points

Update `file:apps/frontend/components/Sidebar.tsx`:
- Add "Plugins" menu item
- Show plugin count badge
- Quick access to recently used plugins

Create plugin hooks in `file:apps/frontend/lib/hooks/usePlugins.ts`:
- `usePluginList()`: Fetch and cache plugin list
- `usePluginExecution()`: Execute plugin and track progress
- `usePluginAnalytics()`: Fetch plugin usage statistics
- `usePluginInstall()`: Handle plugin installation

Create plugin service in `file:apps/frontend/lib/services/pluginService.ts`:
- API client methods for plugin endpoints
- Error handling and retry logic
- Response caching
- WebSocket connection for real-time updates

#### 4.4 Plugin Settings Page

Create `file:apps/frontend/app/plugins/page.tsx`:
- Main plugin management page
- Integrate PluginManager component
- Add breadcrumb navigation
- Include help documentation link

Create `file:apps/frontend/app/plugins/[pluginId]/page.tsx`:
- Individual plugin detail page
- Configuration interface
- Execution history
- Analytics dashboard

### 5. Plugin Testing Framework

#### 5.1 Backend Plugin Tests

Create `file:apps/backend/tests/test_plugins/`:
- `test_plugin_service.py`: Test plugin registration, discovery, CRUD operations
- `test_plugin_execution.py`: Test plugin execution, cancellation, error handling
- `test_plugin_sandbox.py`: Test container isolation, resource limits
- `test_plugin_security.py`: Test permission validation, code scanning
- `conftest.py`: Pytest fixtures for plugin testing

Create `file:apps/backend/tests/test_plugins/fixtures/`:
- Sample plugin implementations for testing
- Mock plugin manifests
- Test data files

#### 5.2 Plugin SDK Tests

Create `file:apps/backend/app/plugins/sdk/tests/`:
- `test_base_plugin.py`: Test BasePlugin interface
- `test_plugin_context.py`: Test PluginContext functionality
- `test_decorators.py`: Test plugin decorators
- `test_validation.py`: Test input validation

#### 5.3 Frontend Plugin Tests

Create `file:apps/frontend/__tests__/plugins/`:
- `PluginManager.test.tsx`: Test plugin manager UI
- `PluginCard.test.tsx`: Test plugin card component
- `PluginExecution.test.tsx`: Test execution monitoring
- Mock plugin API responses

Create `file:apps/frontend/e2e/plugins/`:
- `plugin-installation.spec.ts`: E2E test for plugin installation flow
- `plugin-execution.spec.ts`: E2E test for plugin execution
- `plugin-configuration.spec.ts`: E2E test for plugin configuration

### 6. Example Plugins

#### 6.1 Data Processing Plugin

Create `file:apps/backend/plugins/examples/data_cleaner/`:
- Manifest with data processing capability
- Plugin implementation for common data cleaning tasks
- Configuration schema for cleaning options
- Unit tests

#### 6.2 Visualization Plugin

Create `file:apps/backend/plugins/examples/custom_charts/`:
- Manifest with visualization capability
- Plugin for generating custom chart types
- Configuration for chart customization
- Example outputs

#### 6.3 Model Training Plugin

Create `file:apps/backend/plugins/examples/custom_model/`:
- Manifest with model training capability
- Plugin implementing custom ML algorithm
- Hyperparameter configuration
- Model evaluation metrics

### 7. Plugin Marketplace Backend

#### 7.1 Marketplace Service

Create `file:apps/backend/app/services/plugin_marketplace_service.py`:
- `PluginMarketplaceService` class with methods:
  - `publish_plugin(plugin_id, user_id)`: Submit plugin to marketplace
  - `approve_plugin(plugin_id, admin_id)`: Admin approval workflow
  - `search_marketplace(query, filters)`: Search published plugins
  - `get_featured_plugins()`: Return curated plugin list
  - `submit_review(plugin_id, user_id, rating, comment)`: Add plugin review
  - `get_plugin_reviews(plugin_id)`: Fetch plugin reviews
  - `download_plugin(plugin_id, user_id)`: Track downloads

#### 7.2 Marketplace Models

Extend `file:apps/backend/app/models/plugin.py`:
- `PluginListing` model for marketplace entries
- `PluginReview` model for user reviews
- `PluginDownload` model for tracking downloads
- Fields: listing_status (pending/approved/rejected), featured, download_count, rating_average

### 8. Documentation and Developer Resources

#### 8.1 User Documentation

Create `file:docs/plugins/USER_GUIDE.md`:
- How to browse and install plugins
- Plugin configuration guide
- Executing plugins
- Troubleshooting common issues
- Security best practices

#### 8.2 API Documentation

Update `file:apps/backend/app/services/api_documentation.py`:
- Add plugin endpoints to OpenAPI spec
- Include request/response examples
- Document authentication requirements
- Add plugin execution workflow diagrams

#### 8.3 Example Projects

Create `file:examples/plugins/`:
- `simple_plugin/`: Minimal plugin example
- `data_transformer/`: Data processing plugin
- `ml_model/`: Machine learning plugin
- `visualization/`: Custom visualization plugin
- Each with complete documentation and tests

### 9. Monitoring and Analytics

#### 9.1 Plugin Metrics

Extend `file:apps/backend/app/middleware/metrics.py`:
- Add Prometheus metrics for plugins:
  - `plugin_executions_total`: Counter for plugin executions
  - `plugin_execution_duration_seconds`: Histogram for execution time
  - `plugin_errors_total`: Counter for plugin errors
  - `active_plugin_executions`: Gauge for concurrent executions
  - `plugin_resource_usage`: Gauge for CPU/memory usage

#### 9.2 Plugin Dashboard

Create `file:apps/frontend/app/admin/plugins/page.tsx`:
- Admin dashboard for plugin management
- Plugin approval workflow
- Usage analytics visualization
- System health monitoring
- Resource usage graphs

### 10. Security Hardening

#### 10.1 Code Scanning

Integrate static analysis tools:
- Use `bandit` for Python security scanning
- Implement in `file:apps/backend/app/services/plugin_security_service.py`
- Scan for common vulnerabilities (SQL injection, command injection, etc.)
- Block plugins with security issues

#### 10.2 Sandboxing Configuration

Create `file:apps/backend/app/config/plugin_sandbox_config.py`:
- Define resource limits (CPU: 2 cores, Memory: 4GB, Disk: 10GB)
- Network policies (no external network access by default)
- Filesystem restrictions (read-only except temp directory)
- Execution timeout (30 minutes)
- Allowed system calls whitelist

#### 10.3 Audit Logging

Extend `file:apps/backend/app/services/monitoring.py`:
- Log all plugin operations (install, execute, configure, uninstall)
- Track user actions with timestamps
- Store audit logs in MongoDB
- Implement log retention policy
- Create audit report generation

## Architecture Diagram

```mermaid
sequenceDiagram
    participant User
    participant Frontend
    participant PluginAPI
    participant PluginService
    participant SandboxService
    participant Docker
    participant MongoDB
    participant Redis

    User->>Frontend: Browse Plugins
    Frontend->>PluginAPI: GET /api/v1/plugins
    PluginAPI->>PluginService: list_plugins()
    PluginService->>MongoDB: Query plugins
    MongoDB-->>PluginService: Plugin list
    PluginService-->>PluginAPI: Return plugins
    PluginAPI-->>Frontend: Plugin data
    Frontend-->>User: Display plugins

    User->>Frontend: Install Plugin
    Frontend->>PluginAPI: POST /api/v1/plugins/{id}/install
    PluginAPI->>PluginService: register_plugin()
    PluginService->>PluginService: validate_manifest()
    PluginService->>MongoDB: Save plugin
    PluginService-->>PluginAPI: Installation success
    PluginAPI-->>Frontend: Success response
    Frontend-->>User: Show confirmation

    User->>Frontend: Execute Plugin
    Frontend->>PluginAPI: POST /api/v1/plugins/{id}/execute
    PluginAPI->>PluginService: execute_plugin()
    PluginService->>Redis: Queue execution
    PluginService->>SandboxService: create_sandbox()
    SandboxService->>Docker: Create container
    Docker-->>SandboxService: Container ID
    SandboxService->>Docker: Execute plugin code
    Docker-->>SandboxService: Execution results
    SandboxService->>Docker: Destroy container
    SandboxService-->>PluginService: Results
    PluginService->>MongoDB: Save execution record
    PluginService-->>PluginAPI: Return results
    PluginAPI-->>Frontend: Execution complete
    Frontend-->>User: Display results
```

## Component Relationships

```mermaid
graph TD
    A[Plugin Manager UI] --> B[Plugin API Routes]
    B --> C[Plugin Service]
    B --> D[Plugin Execution Service]
    B --> E[Plugin Marketplace Service]
    
    C --> F[Plugin Registry]
    C --> G[MongoDB - Plugins]
    
    D --> H[Plugin Sandbox Service]
    D --> I[Redis - Execution Queue]
    
    H --> J[Docker Containers]
    
    E --> K[Plugin Analytics Service]
    K --> L[Prometheus Metrics]
    
    M[Plugin SDK] --> N[Base Plugin Class]
    N --> O[Example Plugins]
    
    P[Plugin Security Service] --> C
    P --> D
    
    Q[Plugin Testing Framework] --> M
    Q --> O
```

## Implementation Summary

| Component | Files | Dependencies |
|-----------|-------|--------------|
| **Plugin Models** | `models/plugin.py` | Beanie, MongoDB |
| **Plugin Services** | `services/plugin_service.py`, `services/plugin_execution_service.py`, `services/plugin_sandbox_service.py` | Docker SDK, Redis, MongoDB |
| **Plugin API** | `api/routes/plugins.py` | FastAPI, Plugin Services |
| **Plugin SDK** | `plugins/base.py`, `plugins/sdk/` | Python standard library |
| **Frontend UI** | `components/plugins/`, `app/plugins/` | React, Next.js, Axios |
| **Security** | `services/plugin_security_service.py`, `middleware/plugin_auth.py` | Bandit, Docker |
| **Testing** | `tests/test_plugins/`, `e2e/plugins/` | Pytest, Playwright |
| **Documentation** | `docs/plugins/` | Markdown |

---

Execution Information

Branch: main
Commit: 1963a18

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[traycerai]

I have updated the Implementation Plan to reflect the recent changes in the ticket.

New Plan

Observations

The codebase is a well-structured monorepo with FastAPI backend, Next.js frontend, and an existing MCP server component. The architecture already demonstrates extensibility patterns through the feature store service (file:apps/backend/app/services/feature_store_service.py) and modular route structure. The product requirements document explicitly mentions an AI-orchestrated tool architecture with standardized interfaces, providing a foundation for plugin development. Docker-based deployment with MongoDB and Redis is established, making containerized plugin execution feasible. The middleware system (file:apps/backend/app/middleware/) and service layer pattern provide clear integration points for plugin functionality.

Approach

The implementation will leverage the existing MCP server architecture and service layer patterns to build a comprehensive plugin system. The approach focuses on creating a standardized plugin interface similar to the existing ModelingTool concept mentioned in the product requirements, with a plugin registry service for discovery and management. Security will be achieved through Docker container isolation for plugin execution, building on the existing containerization infrastructure. The frontend will feature a dedicated plugin manager UI integrated with the existing component architecture. The implementation prioritizes backward compatibility and follows established patterns for routes, services, and models to ensure seamless integration with the current codebase.

Implementation Steps

1. Backend Plugin Framework

1.1 Plugin Core Models and Schema

Create plugin data models in file:apps/backend/app/models/plugin.py:

• Plugin document model with fields: plugin_id, name, version, description, author, category, manifest, status (active/inactive/deprecated), installation_date, last_updated, configuration, permissions, dependencies
• PluginVersion document model for version history tracking
• PluginExecution document model for tracking plugin runs with execution_id, plugin_id, user_id, input_data, output_data, status, start_time, end_time, error_logs
• PluginAnalytics document model for usage tracking with metrics like execution_count, success_rate, avg_execution_time, user_count

Create plugin manifest schema in file:apps/backend/app/schemas/plugin_manifest.py:

• Define Pydantic models for plugin manifest structure including metadata, entry_point, dependencies, permissions_required, api_version, hooks (lifecycle hooks), configuration_schema
• Include validation for semantic versioning
• Define capability declarations (data_processing, model_training, visualization, export, etc.)

1.2 Plugin Service Layer

Create file:apps/backend/app/services/plugin_service.py:

• PluginService class with methods:
  • register_plugin(manifest_data, user_id): Validate and register new plugin
  • discover_plugins(): Scan plugin directory and auto-discover available plugins
  • get_plugin(plugin_id, version=None): Retrieve plugin by ID with optional version
  • list_plugins(filters, user_id): List available plugins with filtering by category, author, status
  • update_plugin(plugin_id, updates, user_id): Update plugin metadata or configuration
  • uninstall_plugin(plugin_id, user_id): Soft delete plugin
  • validate_manifest(manifest): Validate plugin manifest against schema
  • check_dependencies(plugin_id): Verify plugin dependencies are satisfied
  • get_plugin_permissions(plugin_id): Return required permissions for plugin

Create file:apps/backend/app/services/plugin_execution_service.py:

• PluginExecutionService class with methods:
  • execute_plugin(plugin_id, input_data, user_id, config={}): Execute plugin in isolated environment
  • get_execution_status(execution_id): Check execution progress
  • cancel_execution(execution_id, user_id): Stop running plugin
  • get_execution_logs(execution_id, user_id): Retrieve execution logs
  • cleanup_execution(execution_id): Clean up resources after execution
• Implement async execution with progress callbacks
• Use Redis for execution queue management
• Implement timeout handling (30 minutes max as per product requirements)

Create file:apps/backend/app/services/plugin_sandbox_service.py:

• PluginSandboxService class for containerized execution:
  • create_sandbox(plugin_id): Create isolated Docker container for plugin
  • execute_in_sandbox(container_id, plugin_code, input_data): Run plugin code in container
  • destroy_sandbox(container_id): Clean up container resources
  • monitor_resources(container_id): Track CPU, memory, disk usage
  • enforce_limits(): Apply resource limits (memory, CPU, network)
• Use Docker SDK for Python to manage containers
• Implement network isolation and filesystem restrictions
• Mount read-only volumes for plugin code

1.3 Plugin Analytics Service

Create file:apps/backend/app/services/plugin_analytics_service.py:

• PluginAnalyticsService class with methods:
  • track_execution(plugin_id, execution_data): Record plugin execution metrics
  • get_plugin_stats(plugin_id, time_range): Retrieve usage statistics
  • get_popular_plugins(limit=10): Return most-used plugins
  • get_user_plugin_usage(user_id): Track user's plugin usage patterns
  • generate_analytics_report(plugin_id): Create comprehensive analytics report
• Integrate with existing Prometheus metrics in file:apps/backend/app/middleware/metrics.py

1.4 Plugin API Routes

Create file:apps/backend/app/api/routes/plugins.py:

• POST /api/v1/plugins - Register new plugin (admin only)
• GET /api/v1/plugins - List available plugins with search and filtering
• GET /api/v1/plugins/{plugin_id} - Get plugin details
• PUT /api/v1/plugins/{plugin_id} - Update plugin configuration
• DELETE /api/v1/plugins/{plugin_id} - Uninstall plugin
• POST /api/v1/plugins/{plugin_id}/execute - Execute plugin
• GET /api/v1/plugins/{plugin_id}/executions - List plugin execution history
• GET /api/v1/plugins/executions/{execution_id} - Get execution details
• POST /api/v1/plugins/executions/{execution_id}/cancel - Cancel execution
• GET /api/v1/plugins/{plugin_id}/analytics - Get plugin analytics
• GET /api/v1/plugins/marketplace - Browse plugin marketplace
• POST /api/v1/plugins/{plugin_id}/install - Install plugin from marketplace

Follow the pattern established in file:apps/backend/app/api/routes/feature_store.py for request/response schemas and error handling.

Register routes in file:apps/backend/app/main.py by adding:

from app.api.routes import plugins
app.include_router(
    plugins.router,
    prefix=f"{settings.API_V1_STR}/plugins",
    tags=["plugins"]
)

1.5 Plugin Security and Permissions

Create file:apps/backend/app/services/plugin_security_service.py:

• PluginSecurityService class with methods:
  • validate_permissions(plugin_id, user_id): Check if user has permission to use plugin
  • scan_plugin_code(plugin_code): Static analysis for security vulnerabilities
  • validate_signature(plugin_package): Verify plugin package signature
  • check_malicious_patterns(code): Scan for suspicious code patterns
  • audit_plugin_access(plugin_id, user_id, action): Log security events
• Implement role-based access control (RBAC) for plugin management
• Integrate with existing auth system in file:apps/backend/app/auth/nextauth_auth.py

Create middleware in file:apps/backend/app/middleware/plugin_auth.py:

• Verify plugin API key authentication
• Rate limiting for plugin executions
• Request validation and sanitization

2. Plugin SDK Development

2.1 Base Plugin Interface

Create file:apps/backend/app/plugins/base.py:

• BasePlugin abstract class with methods:
  • validate_inputs(data): Validate input data structure
  • execute(data, config): Main execution logic (abstract)
  • get_progress(): Return execution progress (0-100)
  • get_results(): Return execution results
  • explain_parameters(): Return parameter documentation
  • on_install(): Lifecycle hook for installation
  • on_uninstall(): Lifecycle hook for cleanup
  • on_error(error): Error handling hook
• Include helper methods for common operations (data loading, result formatting)
• Provide logging utilities that integrate with backend logging

2.2 Plugin Development Kit

Create file:apps/backend/app/plugins/sdk/ directory with:

• plugin_sdk.py: Main SDK module with utilities for plugin developers
  • PluginContext class providing access to data, configuration, logging
  • PluginResult class for standardized result formatting
  • Helper functions for data validation, type conversion, error handling
• decorators.py: Decorators for plugin methods (@validate_input, @track_progress, @handle_errors)
• exceptions.py: Custom exception classes for plugin errors
• testing.py: Testing utilities for plugin developers

Create plugin template in file:apps/backend/app/plugins/templates/:

• example_plugin/ directory with:
  • manifest.json: Example manifest file
  • plugin.py: Example plugin implementation
  • requirements.txt: Python dependencies
  • README.md: Plugin documentation template
  • tests/: Example test files

2.3 Plugin Documentation

Create file:docs/plugins/PLUGIN_DEVELOPMENT_GUIDE.md:

• Getting started with plugin development
• Plugin architecture overview
• Step-by-step tutorial for creating first plugin
• API reference for BasePlugin class
• Best practices and design patterns
• Security guidelines
• Testing strategies
• Deployment instructions

Create file:docs/plugins/PLUGIN_API_REFERENCE.md:

• Complete API documentation for plugin SDK
• Method signatures and parameters
• Return types and data structures
• Code examples for common use cases
• Integration with existing services

3. Plugin Execution Infrastructure

3.1 Docker Container Setup

Create file:apps/backend/Dockerfile.plugin:

• Base image with Python runtime and required dependencies
• Security hardening (non-root user, minimal packages)
• Resource limits configuration
• Network isolation settings
• Volume mount points for plugin code and data

Create file:apps/backend/docker-compose.plugins.yml:

• Plugin execution service configuration
• Network isolation setup
• Volume management for plugin storage
• Resource limits (CPU, memory)
• Health check configuration

3.2 Plugin Registry and Discovery

Create file:apps/backend/app/services/plugin_registry.py:

• PluginRegistry singleton class with methods:
  • register(plugin_class): Register plugin class
  • get(plugin_id): Retrieve plugin by ID
  • list_all(): List all registered plugins
  • search(query, filters): Search plugins by name, category, tags
  • get_by_capability(capability): Find plugins by capability
• Implement plugin loading from filesystem
• Support hot-reloading for development

Create plugin storage structure:

• file:apps/backend/plugins/ directory for installed plugins
• Each plugin in subdirectory: plugins/{plugin_id}/{version}/
• Manifest file: plugins/{plugin_id}/{version}/manifest.json
• Plugin code: plugins/{plugin_id}/{version}/plugin.py

3.3 Plugin Versioning System

Extend file:apps/backend/app/services/versioning_service.py:

• Add plugin versioning support
• Track plugin version history
• Handle version conflicts and dependencies
• Support rollback to previous versions
• Implement semantic versioning validation

4. Frontend Plugin Manager UI

4.1 Plugin Management Components

Create file:apps/frontend/components/plugins/PluginManager.tsx:

• Main plugin manager interface
• Tabs for: Installed, Available, Marketplace
• Search and filter functionality
• Plugin cards with name, description, version, author, rating
• Install/uninstall buttons with confirmation dialogs

Create file:apps/frontend/components/plugins/PluginCard.tsx:

• Display plugin information
• Show installation status
• Action buttons (Install, Configure, Uninstall, View Details)
• Usage statistics display
• Version selector dropdown

Create file:apps/frontend/components/plugins/PluginDetails.tsx:

• Detailed plugin information modal
• Description, documentation, changelog
• Configuration options
• Permissions required
• Dependencies list
• User reviews and ratings

Create file:apps/frontend/components/plugins/PluginConfiguration.tsx:

• Dynamic form generation based on plugin configuration schema
• Input validation
• Save/reset configuration
• Test configuration button

Create file:apps/frontend/components/plugins/PluginExecutionMonitor.tsx:

• Real-time execution progress display
• Log viewer with filtering
• Cancel execution button
• Execution history table
• Result visualization

4.2 Plugin Marketplace UI

Create file:apps/frontend/components/plugins/PluginMarketplace.tsx:

• Browse available plugins
• Category navigation
• Featured plugins section
• Search with autocomplete
• Sort by popularity, rating, recent
• Plugin preview cards

Create file:apps/frontend/components/plugins/PluginReview.tsx:

• Display user reviews
• Rating system (1-5 stars)
• Review submission form
• Helpful/not helpful voting

4.3 Plugin Integration Points

Update file:apps/frontend/components/Sidebar.tsx:

• Add "Plugins" menu item
• Show plugin count badge
• Quick access to recently used plugins

Create plugin hooks in file:apps/frontend/lib/hooks/usePlugins.ts:

• usePluginList(): Fetch and cache plugin list
• usePluginExecution(): Execute plugin and track progress
• usePluginAnalytics(): Fetch plugin usage statistics
• usePluginInstall(): Handle plugin installation

Create plugin service in file:apps/frontend/lib/services/pluginService.ts:

• API client methods for plugin endpoints
• Error handling and retry logic
• Response caching
• WebSocket connection for real-time updates

4.4 Plugin Settings Page

Create file:apps/frontend/app/plugins/page.tsx:

• Main plugin management page
• Integrate PluginManager component
• Add breadcrumb navigation
• Include help documentation link

Create file:apps/frontend/app/plugins/[pluginId]/page.tsx:

• Individual plugin detail page
• Configuration interface
• Execution history
• Analytics dashboard

5. Plugin Testing Framework

5.1 Backend Plugin Tests

Create file:apps/backend/tests/test_plugins/:

• test_plugin_service.py: Test plugin registration, discovery, CRUD operations
• test_plugin_execution.py: Test plugin execution, cancellation, error handling
• test_plugin_sandbox.py: Test container isolation, resource limits
• test_plugin_security.py: Test permission validation, code scanning
• conftest.py: Pytest fixtures for plugin testing

Create file:apps/backend/tests/test_plugins/fixtures/:

• Sample plugin implementations for testing
• Mock plugin manifests
• Test data files

5.2 Plugin SDK Tests

Create file:apps/backend/app/plugins/sdk/tests/:

• test_base_plugin.py: Test BasePlugin interface
• test_plugin_context.py: Test PluginContext functionality
• test_decorators.py: Test plugin decorators
• test_validation.py: Test input validation

5.3 Frontend Plugin Tests

Create file:apps/frontend/__tests__/plugins/:

• PluginManager.test.tsx: Test plugin manager UI
• PluginCard.test.tsx: Test plugin card component
• PluginExecution.test.tsx: Test execution monitoring
• Mock plugin API responses

Create file:apps/frontend/e2e/plugins/:

• plugin-installation.spec.ts: E2E test for plugin installation flow
• plugin-execution.spec.ts: E2E test for plugin execution
• plugin-configuration.spec.ts: E2E test for plugin configuration

6. Example Plugins

6.1 Data Processing Plugin

Create file:apps/backend/plugins/examples/data_cleaner/:

• Manifest with data processing capability
• Plugin implementation for common data cleaning tasks
• Configuration schema for cleaning options
• Unit tests

6.2 Visualization Plugin

Create file:apps/backend/plugins/examples/custom_charts/:

• Manifest with visualization capability
• Plugin for generating custom chart types
• Configuration for chart customization
• Example outputs

6.3 Model Training Plugin

Create file:apps/backend/plugins/examples/custom_model/:

• Manifest with model training capability
• Plugin implementing custom ML algorithm
• Hyperparameter configuration
• Model evaluation metrics

7. Plugin Marketplace Backend

7.1 Marketplace Service

Create file:apps/backend/app/services/plugin_marketplace_service.py:

• PluginMarketplaceService class with methods:
  • publish_plugin(plugin_id, user_id): Submit plugin to marketplace
  • approve_plugin(plugin_id, admin_id): Admin approval workflow
  • search_marketplace(query, filters): Search published plugins
  • get_featured_plugins(): Return curated plugin list
  • submit_review(plugin_id, user_id, rating, comment): Add plugin review
  • get_plugin_reviews(plugin_id): Fetch plugin reviews
  • download_plugin(plugin_id, user_id): Track downloads

7.2 Marketplace Models

Extend file:apps/backend/app/models/plugin.py:

• PluginListing model for marketplace entries
• PluginReview model for user reviews
• PluginDownload model for tracking downloads
• Fields: listing_status (pending/approved/rejected), featured, download_count, rating_average

8. Documentation and Developer Resources

8.1 User Documentation

Create file:docs/plugins/USER_GUIDE.md:

• How to browse and install plugins
• Plugin configuration guide
• Executing plugins
• Troubleshooting common issues
• Security best practices

8.2 API Documentation

Update file:apps/backend/app/services/api_documentation.py:

• Add plugin endpoints to OpenAPI spec
• Include request/response examples
• Document authentication requirements
• Add plugin execution workflow diagrams

8.3 Example Projects

Create file:examples/plugins/:

• simple_plugin/: Minimal plugin example
• data_transformer/: Data processing plugin
• ml_model/: Machine learning plugin
• visualization/: Custom visualization plugin
• Each with complete documentation and tests

9. Monitoring and Analytics

9.1 Plugin Metrics

Extend file:apps/backend/app/middleware/metrics.py:

• Add Prometheus metrics for plugins:
  • plugin_executions_total: Counter for plugin executions
  • plugin_execution_duration_seconds: Histogram for execution time
  • plugin_errors_total: Counter for plugin errors
  • active_plugin_executions: Gauge for concurrent executions
  • plugin_resource_usage: Gauge for CPU/memory usage

9.2 Plugin Dashboard

Create file:apps/frontend/app/admin/plugins/page.tsx:

• Admin dashboard for plugin management
• Plugin approval workflow
• Usage analytics visualization
• System health monitoring
• Resource usage graphs

10. Security Hardening

10.1 Code Scanning

Integrate static analysis tools:

• Use bandit for Python security scanning
• Implement in file:apps/backend/app/services/plugin_security_service.py
• Scan for common vulnerabilities (SQL injection, command injection, etc.)
• Block plugins with security issues

10.2 Sandboxing Configuration

Create file:apps/backend/app/config/plugin_sandbox_config.py:

• Define resource limits (CPU: 2 cores, Memory: 4GB, Disk: 10GB)
• Network policies (no external network access by default)
• Filesystem restrictions (read-only except temp directory)
• Execution timeout (30 minutes)
• Allowed system calls whitelist

10.3 Audit Logging

Extend file:apps/backend/app/services/monitoring.py:

• Log all plugin operations (install, execute, configure, uninstall)
• Track user actions with timestamps
• Store audit logs in MongoDB
• Implement log retention policy
• Create audit report generation

Architecture Diagram

sequenceDiagram
    participant User
    participant Frontend
    participant PluginAPI
    participant PluginService
    participant SandboxService
    participant Docker
    participant MongoDB
    participant Redis

    User->>Frontend: Browse Plugins
    Frontend->>PluginAPI: GET /api/v1/plugins
    PluginAPI->>PluginService: list_plugins()
    PluginService->>MongoDB: Query plugins
    MongoDB-->>PluginService: Plugin list
    PluginService-->>PluginAPI: Return plugins
    PluginAPI-->>Frontend: Plugin data
    Frontend-->>User: Display plugins

    User->>Frontend: Install Plugin
    Frontend->>PluginAPI: POST /api/v1/plugins/{id}/install
    PluginAPI->>PluginService: register_plugin()
    PluginService->>PluginService: validate_manifest()
    PluginService->>MongoDB: Save plugin
    PluginService-->>PluginAPI: Installation success
    PluginAPI-->>Frontend: Success response
    Frontend-->>User: Show confirmation

    User->>Frontend: Execute Plugin
    Frontend->>PluginAPI: POST /api/v1/plugins/{id}/execute
    PluginAPI->>PluginService: execute_plugin()
    PluginService->>Redis: Queue execution
    PluginService->>SandboxService: create_sandbox()
    SandboxService->>Docker: Create container
    Docker-->>SandboxService: Container ID
    SandboxService->>Docker: Execute plugin code
    Docker-->>SandboxService: Execution results
    SandboxService->>Docker: Destroy container
    SandboxService-->>PluginService: Results
    PluginService->>MongoDB: Save execution record
    PluginService-->>PluginAPI: Return results
    PluginAPI-->>Frontend: Execution complete
    Frontend-->>User: Display results

Loading

Component Relationships

graph TD
    A[Plugin Manager UI] --> B[Plugin API Routes]
    B --> C[Plugin Service]
    B --> D[Plugin Execution Service]
    B --> E[Plugin Marketplace Service]
    
    C --> F[Plugin Registry]
    C --> G[MongoDB - Plugins]
    
    D --> H[Plugin Sandbox Service]
    D --> I[Redis - Execution Queue]
    
    H --> J[Docker Containers]
    
    E --> K[Plugin Analytics Service]
    K --> L[Prometheus Metrics]
    
    M[Plugin SDK] --> N[Base Plugin Class]
    N --> O[Example Plugins]
    
    P[Plugin Security Service] --> C
    P --> D
    
    Q[Plugin Testing Framework] --> M
    Q --> O

Loading

Implementation Summary

Component	Files	Dependencies
Plugin Models	models/plugin.py	Beanie, MongoDB
Plugin Services	services/plugin_service.py, services/plugin_execution_service.py, services/plugin_sandbox_service.py	Docker SDK, Redis, MongoDB
Plugin API	api/routes/plugins.py	FastAPI, Plugin Services
Plugin SDK	plugins/base.py, plugins/sdk/	Python standard library
Frontend UI	components/plugins/, app/plugins/	React, Next.js, Axios
Security	services/plugin_security_service.py, middleware/plugin_auth.py	Bandit, Docker
Testing	tests/test_plugins/, e2e/plugins/	Pytest, Playwright
Documentation	docs/plugins/	Markdown

Import In IDE

🤖 Prompt for AI Agents

## Observations

The codebase is a well-structured monorepo with FastAPI backend, Next.js frontend, and an existing MCP server component. The architecture already demonstrates extensibility patterns through the feature store service (`file:apps/backend/app/services/feature_store_service.py`) and modular route structure. The product requirements document explicitly mentions an AI-orchestrated tool architecture with standardized interfaces, providing a foundation for plugin development. Docker-based deployment with MongoDB and Redis is established, making containerized plugin execution feasible. The middleware system (`file:apps/backend/app/middleware/`) and service layer pattern provide clear integration points for plugin functionality.

## Approach

The implementation will leverage the existing MCP server architecture and service layer patterns to build a comprehensive plugin system. The approach focuses on creating a standardized plugin interface similar to the existing `ModelingTool` concept mentioned in the product requirements, with a plugin registry service for discovery and management. Security will be achieved through Docker container isolation for plugin execution, building on the existing containerization infrastructure. The frontend will feature a dedicated plugin manager UI integrated with the existing component architecture. The implementation prioritizes backward compatibility and follows established patterns for routes, services, and models to ensure seamless integration with the current codebase.

## Implementation Steps

### 1. Backend Plugin Framework

#### 1.1 Plugin Core Models and Schema

Create plugin data models in `file:apps/backend/app/models/plugin.py`:
- `Plugin` document model with fields: plugin_id, name, version, description, author, category, manifest, status (active/inactive/deprecated), installation_date, last_updated, configuration, permissions, dependencies
- `PluginVersion` document model for version history tracking
- `PluginExecution` document model for tracking plugin runs with execution_id, plugin_id, user_id, input_data, output_data, status, start_time, end_time, error_logs
- `PluginAnalytics` document model for usage tracking with metrics like execution_count, success_rate, avg_execution_time, user_count

Create plugin manifest schema in `file:apps/backend/app/schemas/plugin_manifest.py`:
- Define Pydantic models for plugin manifest structure including metadata, entry_point, dependencies, permissions_required, api_version, hooks (lifecycle hooks), configuration_schema
- Include validation for semantic versioning
- Define capability declarations (data_processing, model_training, visualization, export, etc.)

#### 1.2 Plugin Service Layer

Create `file:apps/backend/app/services/plugin_service.py`:
- `PluginService` class with methods:
  - `register_plugin(manifest_data, user_id)`: Validate and register new plugin
  - `discover_plugins()`: Scan plugin directory and auto-discover available plugins
  - `get_plugin(plugin_id, version=None)`: Retrieve plugin by ID with optional version
  - `list_plugins(filters, user_id)`: List available plugins with filtering by category, author, status
  - `update_plugin(plugin_id, updates, user_id)`: Update plugin metadata or configuration
  - `uninstall_plugin(plugin_id, user_id)`: Soft delete plugin
  - `validate_manifest(manifest)`: Validate plugin manifest against schema
  - `check_dependencies(plugin_id)`: Verify plugin dependencies are satisfied
  - `get_plugin_permissions(plugin_id)`: Return required permissions for plugin

Create `file:apps/backend/app/services/plugin_execution_service.py`:
- `PluginExecutionService` class with methods:
  - `execute_plugin(plugin_id, input_data, user_id, config={})`: Execute plugin in isolated environment
  - `get_execution_status(execution_id)`: Check execution progress
  - `cancel_execution(execution_id, user_id)`: Stop running plugin
  - `get_execution_logs(execution_id, user_id)`: Retrieve execution logs
  - `cleanup_execution(execution_id)`: Clean up resources after execution
- Implement async execution with progress callbacks
- Use Redis for execution queue management
- Implement timeout handling (30 minutes max as per product requirements)

Create `file:apps/backend/app/services/plugin_sandbox_service.py`:
- `PluginSandboxService` class for containerized execution:
  - `create_sandbox(plugin_id)`: Create isolated Docker container for plugin
  - `execute_in_sandbox(container_id, plugin_code, input_data)`: Run plugin code in container
  - `destroy_sandbox(container_id)`: Clean up container resources
  - `monitor_resources(container_id)`: Track CPU, memory, disk usage
  - `enforce_limits()`: Apply resource limits (memory, CPU, network)
- Use Docker SDK for Python to manage containers
- Implement network isolation and filesystem restrictions
- Mount read-only volumes for plugin code

#### 1.3 Plugin Analytics Service

Create `file:apps/backend/app/services/plugin_analytics_service.py`:
- `PluginAnalyticsService` class with methods:
  - `track_execution(plugin_id, execution_data)`: Record plugin execution metrics
  - `get_plugin_stats(plugin_id, time_range)`: Retrieve usage statistics
  - `get_popular_plugins(limit=10)`: Return most-used plugins
  - `get_user_plugin_usage(user_id)`: Track user's plugin usage patterns
  - `generate_analytics_report(plugin_id)`: Create comprehensive analytics report
- Integrate with existing Prometheus metrics in `file:apps/backend/app/middleware/metrics.py`

#### 1.4 Plugin API Routes

Create `file:apps/backend/app/api/routes/plugins.py`:
- `POST /api/v1/plugins` - Register new plugin (admin only)
- `GET /api/v1/plugins` - List available plugins with search and filtering
- `GET /api/v1/plugins/{plugin_id}` - Get plugin details
- `PUT /api/v1/plugins/{plugin_id}` - Update plugin configuration
- `DELETE /api/v1/plugins/{plugin_id}` - Uninstall plugin
- `POST /api/v1/plugins/{plugin_id}/execute` - Execute plugin
- `GET /api/v1/plugins/{plugin_id}/executions` - List plugin execution history
- `GET /api/v1/plugins/executions/{execution_id}` - Get execution details
- `POST /api/v1/plugins/executions/{execution_id}/cancel` - Cancel execution
- `GET /api/v1/plugins/{plugin_id}/analytics` - Get plugin analytics
- `GET /api/v1/plugins/marketplace` - Browse plugin marketplace
- `POST /api/v1/plugins/{plugin_id}/install` - Install plugin from marketplace

Follow the pattern established in `file:apps/backend/app/api/routes/feature_store.py` for request/response schemas and error handling.

Register routes in `file:apps/backend/app/main.py` by adding:
```python
from app.api.routes import plugins
app.include_router(
    plugins.router,
    prefix=f"{settings.API_V1_STR}/plugins",
    tags=["plugins"]
)
```

#### 1.5 Plugin Security and Permissions

Create `file:apps/backend/app/services/plugin_security_service.py`:
- `PluginSecurityService` class with methods:
  - `validate_permissions(plugin_id, user_id)`: Check if user has permission to use plugin
  - `scan_plugin_code(plugin_code)`: Static analysis for security vulnerabilities
  - `validate_signature(plugin_package)`: Verify plugin package signature
  - `check_malicious_patterns(code)`: Scan for suspicious code patterns
  - `audit_plugin_access(plugin_id, user_id, action)`: Log security events
- Implement role-based access control (RBAC) for plugin management
- Integrate with existing auth system in `file:apps/backend/app/auth/nextauth_auth.py`

Create middleware in `file:apps/backend/app/middleware/plugin_auth.py`:
- Verify plugin API key authentication
- Rate limiting for plugin executions
- Request validation and sanitization

### 2. Plugin SDK Development

#### 2.1 Base Plugin Interface

Create `file:apps/backend/app/plugins/base.py`:
- `BasePlugin` abstract class with methods:
  - `validate_inputs(data)`: Validate input data structure
  - `execute(data, config)`: Main execution logic (abstract)
  - `get_progress()`: Return execution progress (0-100)
  - `get_results()`: Return execution results
  - `explain_parameters()`: Return parameter documentation
  - `on_install()`: Lifecycle hook for installation
  - `on_uninstall()`: Lifecycle hook for cleanup
  - `on_error(error)`: Error handling hook
- Include helper methods for common operations (data loading, result formatting)
- Provide logging utilities that integrate with backend logging

#### 2.2 Plugin Development Kit

Create `file:apps/backend/app/plugins/sdk/` directory with:
- `plugin_sdk.py`: Main SDK module with utilities for plugin developers
  - `PluginContext` class providing access to data, configuration, logging
  - `PluginResult` class for standardized result formatting
  - Helper functions for data validation, type conversion, error handling
- `decorators.py`: Decorators for plugin methods (@validate_input, @track_progress, @handle_errors)
- `exceptions.py`: Custom exception classes for plugin errors
- `testing.py`: Testing utilities for plugin developers

Create plugin template in `file:apps/backend/app/plugins/templates/`:
- `example_plugin/` directory with:
  - `manifest.json`: Example manifest file
  - `plugin.py`: Example plugin implementation
  - `requirements.txt`: Python dependencies
  - `README.md`: Plugin documentation template
  - `tests/`: Example test files

#### 2.3 Plugin Documentation

Create `file:docs/plugins/PLUGIN_DEVELOPMENT_GUIDE.md`:
- Getting started with plugin development
- Plugin architecture overview
- Step-by-step tutorial for creating first plugin
- API reference for BasePlugin class
- Best practices and design patterns
- Security guidelines
- Testing strategies
- Deployment instructions

Create `file:docs/plugins/PLUGIN_API_REFERENCE.md`:
- Complete API documentation for plugin SDK
- Method signatures and parameters
- Return types and data structures
- Code examples for common use cases
- Integration with existing services

### 3. Plugin Execution Infrastructure

#### 3.1 Docker Container Setup

Create `file:apps/backend/Dockerfile.plugin`:
- Base image with Python runtime and required dependencies
- Security hardening (non-root user, minimal packages)
- Resource limits configuration
- Network isolation settings
- Volume mount points for plugin code and data

Create `file:apps/backend/docker-compose.plugins.yml`:
- Plugin execution service configuration
- Network isolation setup
- Volume management for plugin storage
- Resource limits (CPU, memory)
- Health check configuration

#### 3.2 Plugin Registry and Discovery

Create `file:apps/backend/app/services/plugin_registry.py`:
- `PluginRegistry` singleton class with methods:
  - `register(plugin_class)`: Register plugin class
  - `get(plugin_id)`: Retrieve plugin by ID
  - `list_all()`: List all registered plugins
  - `search(query, filters)`: Search plugins by name, category, tags
  - `get_by_capability(capability)`: Find plugins by capability
- Implement plugin loading from filesystem
- Support hot-reloading for development

Create plugin storage structure:
- `file:apps/backend/plugins/` directory for installed plugins
- Each plugin in subdirectory: `plugins/{plugin_id}/{version}/`
- Manifest file: `plugins/{plugin_id}/{version}/manifest.json`
- Plugin code: `plugins/{plugin_id}/{version}/plugin.py`

#### 3.3 Plugin Versioning System

Extend `file:apps/backend/app/services/versioning_service.py`:
- Add plugin versioning support
- Track plugin version history
- Handle version conflicts and dependencies
- Support rollback to previous versions
- Implement semantic versioning validation

### 4. Frontend Plugin Manager UI

#### 4.1 Plugin Management Components

Create `file:apps/frontend/components/plugins/PluginManager.tsx`:
- Main plugin manager interface
- Tabs for: Installed, Available, Marketplace
- Search and filter functionality
- Plugin cards with name, description, version, author, rating
- Install/uninstall buttons with confirmation dialogs

Create `file:apps/frontend/components/plugins/PluginCard.tsx`:
- Display plugin information
- Show installation status
- Action buttons (Install, Configure, Uninstall, View Details)
- Usage statistics display
- Version selector dropdown

Create `file:apps/frontend/components/plugins/PluginDetails.tsx`:
- Detailed plugin information modal
- Description, documentation, changelog
- Configuration options
- Permissions required
- Dependencies list
- User reviews and ratings

Create `file:apps/frontend/components/plugins/PluginConfiguration.tsx`:
- Dynamic form generation based on plugin configuration schema
- Input validation
- Save/reset configuration
- Test configuration button

Create `file:apps/frontend/components/plugins/PluginExecutionMonitor.tsx`:
- Real-time execution progress display
- Log viewer with filtering
- Cancel execution button
- Execution history table
- Result visualization

#### 4.2 Plugin Marketplace UI

Create `file:apps/frontend/components/plugins/PluginMarketplace.tsx`:
- Browse available plugins
- Category navigation
- Featured plugins section
- Search with autocomplete
- Sort by popularity, rating, recent
- Plugin preview cards

Create `file:apps/frontend/components/plugins/PluginReview.tsx`:
- Display user reviews
- Rating system (1-5 stars)
- Review submission form
- Helpful/not helpful voting

#### 4.3 Plugin Integration Points

Update `file:apps/frontend/components/Sidebar.tsx`:
- Add "Plugins" menu item
- Show plugin count badge
- Quick access to recently used plugins

Create plugin hooks in `file:apps/frontend/lib/hooks/usePlugins.ts`:
- `usePluginList()`: Fetch and cache plugin list
- `usePluginExecution()`: Execute plugin and track progress
- `usePluginAnalytics()`: Fetch plugin usage statistics
- `usePluginInstall()`: Handle plugin installation

Create plugin service in `file:apps/frontend/lib/services/pluginService.ts`:
- API client methods for plugin endpoints
- Error handling and retry logic
- Response caching
- WebSocket connection for real-time updates

#### 4.4 Plugin Settings Page

Create `file:apps/frontend/app/plugins/page.tsx`:
- Main plugin management page
- Integrate PluginManager component
- Add breadcrumb navigation
- Include help documentation link

Create `file:apps/frontend/app/plugins/[pluginId]/page.tsx`:
- Individual plugin detail page
- Configuration interface
- Execution history
- Analytics dashboard

### 5. Plugin Testing Framework

#### 5.1 Backend Plugin Tests

Create `file:apps/backend/tests/test_plugins/`:
- `test_plugin_service.py`: Test plugin registration, discovery, CRUD operations
- `test_plugin_execution.py`: Test plugin execution, cancellation, error handling
- `test_plugin_sandbox.py`: Test container isolation, resource limits
- `test_plugin_security.py`: Test permission validation, code scanning
- `conftest.py`: Pytest fixtures for plugin testing

Create `file:apps/backend/tests/test_plugins/fixtures/`:
- Sample plugin implementations for testing
- Mock plugin manifests
- Test data files

#### 5.2 Plugin SDK Tests

Create `file:apps/backend/app/plugins/sdk/tests/`:
- `test_base_plugin.py`: Test BasePlugin interface
- `test_plugin_context.py`: Test PluginContext functionality
- `test_decorators.py`: Test plugin decorators
- `test_validation.py`: Test input validation

#### 5.3 Frontend Plugin Tests

Create `file:apps/frontend/__tests__/plugins/`:
- `PluginManager.test.tsx`: Test plugin manager UI
- `PluginCard.test.tsx`: Test plugin card component
- `PluginExecution.test.tsx`: Test execution monitoring
- Mock plugin API responses

Create `file:apps/frontend/e2e/plugins/`:
- `plugin-installation.spec.ts`: E2E test for plugin installation flow
- `plugin-execution.spec.ts`: E2E test for plugin execution
- `plugin-configuration.spec.ts`: E2E test for plugin configuration

### 6. Example Plugins

#### 6.1 Data Processing Plugin

Create `file:apps/backend/plugins/examples/data_cleaner/`:
- Manifest with data processing capability
- Plugin implementation for common data cleaning tasks
- Configuration schema for cleaning options
- Unit tests

#### 6.2 Visualization Plugin

Create `file:apps/backend/plugins/examples/custom_charts/`:
- Manifest with visualization capability
- Plugin for generating custom chart types
- Configuration for chart customization
- Example outputs

#### 6.3 Model Training Plugin

Create `file:apps/backend/plugins/examples/custom_model/`:
- Manifest with model training capability
- Plugin implementing custom ML algorithm
- Hyperparameter configuration
- Model evaluation metrics

### 7. Plugin Marketplace Backend

#### 7.1 Marketplace Service

Create `file:apps/backend/app/services/plugin_marketplace_service.py`:
- `PluginMarketplaceService` class with methods:
  - `publish_plugin(plugin_id, user_id)`: Submit plugin to marketplace
  - `approve_plugin(plugin_id, admin_id)`: Admin approval workflow
  - `search_marketplace(query, filters)`: Search published plugins
  - `get_featured_plugins()`: Return curated plugin list
  - `submit_review(plugin_id, user_id, rating, comment)`: Add plugin review
  - `get_plugin_reviews(plugin_id)`: Fetch plugin reviews
  - `download_plugin(plugin_id, user_id)`: Track downloads

#### 7.2 Marketplace Models

Extend `file:apps/backend/app/models/plugin.py`:
- `PluginListing` model for marketplace entries
- `PluginReview` model for user reviews
- `PluginDownload` model for tracking downloads
- Fields: listing_status (pending/approved/rejected), featured, download_count, rating_average

### 8. Documentation and Developer Resources

#### 8.1 User Documentation

Create `file:docs/plugins/USER_GUIDE.md`:
- How to browse and install plugins
- Plugin configuration guide
- Executing plugins
- Troubleshooting common issues
- Security best practices

#### 8.2 API Documentation

Update `file:apps/backend/app/services/api_documentation.py`:
- Add plugin endpoints to OpenAPI spec
- Include request/response examples
- Document authentication requirements
- Add plugin execution workflow diagrams

#### 8.3 Example Projects

Create `file:examples/plugins/`:
- `simple_plugin/`: Minimal plugin example
- `data_transformer/`: Data processing plugin
- `ml_model/`: Machine learning plugin
- `visualization/`: Custom visualization plugin
- Each with complete documentation and tests

### 9. Monitoring and Analytics

#### 9.1 Plugin Metrics

Extend `file:apps/backend/app/middleware/metrics.py`:
- Add Prometheus metrics for plugins:
  - `plugin_executions_total`: Counter for plugin executions
  - `plugin_execution_duration_seconds`: Histogram for execution time
  - `plugin_errors_total`: Counter for plugin errors
  - `active_plugin_executions`: Gauge for concurrent executions
  - `plugin_resource_usage`: Gauge for CPU/memory usage

#### 9.2 Plugin Dashboard

Create `file:apps/frontend/app/admin/plugins/page.tsx`:
- Admin dashboard for plugin management
- Plugin approval workflow
- Usage analytics visualization
- System health monitoring
- Resource usage graphs

### 10. Security Hardening

#### 10.1 Code Scanning

Integrate static analysis tools:
- Use `bandit` for Python security scanning
- Implement in `file:apps/backend/app/services/plugin_security_service.py`
- Scan for common vulnerabilities (SQL injection, command injection, etc.)
- Block plugins with security issues

#### 10.2 Sandboxing Configuration

Create `file:apps/backend/app/config/plugin_sandbox_config.py`:
- Define resource limits (CPU: 2 cores, Memory: 4GB, Disk: 10GB)
- Network policies (no external network access by default)
- Filesystem restrictions (read-only except temp directory)
- Execution timeout (30 minutes)
- Allowed system calls whitelist

#### 10.3 Audit Logging

Extend `file:apps/backend/app/services/monitoring.py`:
- Log all plugin operations (install, execute, configure, uninstall)
- Track user actions with timestamps
- Store audit logs in MongoDB
- Implement log retention policy
- Create audit report generation

## Architecture Diagram

```mermaid
sequenceDiagram
    participant User
    participant Frontend
    participant PluginAPI
    participant PluginService
    participant SandboxService
    participant Docker
    participant MongoDB
    participant Redis

    User->>Frontend: Browse Plugins
    Frontend->>PluginAPI: GET /api/v1/plugins
    PluginAPI->>PluginService: list_plugins()
    PluginService->>MongoDB: Query plugins
    MongoDB-->>PluginService: Plugin list
    PluginService-->>PluginAPI: Return plugins
    PluginAPI-->>Frontend: Plugin data
    Frontend-->>User: Display plugins

    User->>Frontend: Install Plugin
    Frontend->>PluginAPI: POST /api/v1/plugins/{id}/install
    PluginAPI->>PluginService: register_plugin()
    PluginService->>PluginService: validate_manifest()
    PluginService->>MongoDB: Save plugin
    PluginService-->>PluginAPI: Installation success
    PluginAPI-->>Frontend: Success response
    Frontend-->>User: Show confirmation

    User->>Frontend: Execute Plugin
    Frontend->>PluginAPI: POST /api/v1/plugins/{id}/execute
    PluginAPI->>PluginService: execute_plugin()
    PluginService->>Redis: Queue execution
    PluginService->>SandboxService: create_sandbox()
    SandboxService->>Docker: Create container
    Docker-->>SandboxService: Container ID
    SandboxService->>Docker: Execute plugin code
    Docker-->>SandboxService: Execution results
    SandboxService->>Docker: Destroy container
    SandboxService-->>PluginService: Results
    PluginService->>MongoDB: Save execution record
    PluginService-->>PluginAPI: Return results
    PluginAPI-->>Frontend: Execution complete
    Frontend-->>User: Display results
```

## Component Relationships

```mermaid
graph TD
    A[Plugin Manager UI] --> B[Plugin API Routes]
    B --> C[Plugin Service]
    B --> D[Plugin Execution Service]
    B --> E[Plugin Marketplace Service]
    
    C --> F[Plugin Registry]
    C --> G[MongoDB - Plugins]
    
    D --> H[Plugin Sandbox Service]
    D --> I[Redis - Execution Queue]
    
    H --> J[Docker Containers]
    
    E --> K[Plugin Analytics Service]
    K --> L[Prometheus Metrics]
    
    M[Plugin SDK] --> N[Base Plugin Class]
    N --> O[Example Plugins]
    
    P[Plugin Security Service] --> C
    P --> D
    
    Q[Plugin Testing Framework] --> M
    Q --> O
```

## Implementation Summary

| Component | Files | Dependencies |
|-----------|-------|--------------|
| **Plugin Models** | `models/plugin.py` | Beanie, MongoDB |
| **Plugin Services** | `services/plugin_service.py`, `services/plugin_execution_service.py`, `services/plugin_sandbox_service.py` | Docker SDK, Redis, MongoDB |
| **Plugin API** | `api/routes/plugins.py` | FastAPI, Plugin Services |
| **Plugin SDK** | `plugins/base.py`, `plugins/sdk/` | Python standard library |
| **Frontend UI** | `components/plugins/`, `app/plugins/` | React, Next.js, Axios |
| **Security** | `services/plugin_security_service.py`, `middleware/plugin_auth.py` | Bandit, Docker |
| **Testing** | `tests/test_plugins/`, `e2e/plugins/` | Pytest, Playwright |
| **Documentation** | `docs/plugins/` | Markdown |

---

Execution Information

Branch: main
Commit: 1963a18