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Add design pattern review references to README and contributing guide (#127)
* Add design pattern review references to README and contributing guide
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‎README.md‎

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@@ -218,6 +218,21 @@ The system is built with a modular architecture:
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- **Authentication**: Multiple auth provider support
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- **Reporting**: FuzzerReporter, Console/JSON/Text formatters, SafetyReporter
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### Understanding the Design Patterns
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For developers (beginners to intermediate) who want to understand the design patterns used throughout the codebase, please refer to our comprehensive [Design Pattern Review](docs/design-pattern-review.md). This document provides:
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- Module-by-module pattern analysis
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- Design pattern fit scores and recommendations
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- Modularity observations and improvement suggestions
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- Complete pattern map for every module in the codebase
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This is especially helpful if you're:
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- Learning about design patterns in real-world applications
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- Planning to contribute to the project
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- Wanting to understand the architectural decisions
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- Looking for areas to improve or extend
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## Troubleshooting
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### Common Issues

‎docs/design-pattern-review.md‎

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# Design Pattern Review
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This document explains how the MCP Server Fuzzer applies common design
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patterns, how well they fit the current implementation, and where future
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contributors can improve the architecture. Each section lists the primary
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patterns in play, a qualitative "fit score" (0-10), and concrete next steps.
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## Pattern Map
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| Module | Primary Patterns | Fit Score |
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| --- | --- | --- |
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| CLI Layer | Facade, Command, Builder | 8 |
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| Transport Layer | Strategy, Adapter, Factory | 9 |
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| Fuzzing Engine | Template Method, Observer, Mediator | 7 |
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| Strategy System | Strategy, Prototype, Data Builder | 8 |
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| Safety System | Chain of Responsibility, Decorator | 7 |
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| Runtime & Process Management | State, Watchdog, Resource Pool | 8 |
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| Reporting & Observability | Observer, Bridge, Adapter | 7 |
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## Module-by-Module Analysis
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### CLI Layer (Fit Score: 8/10)
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- **Patterns Used:** Facade to shield users from subsystem complexity, Command
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objects for sub-commands/options, Builder for assembling runtime config.
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- **Strengths:** The CLI is a clear entry point that composes transports,
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strategies, and reporters. Options map almost 1:1 to configuration objects.
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- **Gaps & Ideas:** Reuse of parsing logic across sub-commands could improve if
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argument builders lived in a dedicated factory so the CLI does not own every
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instantiation detail.
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Next steps:
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- Extract reusable CLI config builders so new commands inherit validation rules.
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- Create smoke tests that cover composite CLI scenarios (auth + transports +
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safety flags) to guard the Facade contract.
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### Transport Layer (Fit Score: 9/10)
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- **Patterns Used:** Strategy for choosing HTTP/SSE/Stdio transports, Adapter
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to normalize differing protocol semantics, Abstract Factory for wiring the
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right transport + auth combo.
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- **Strengths:** `create_transport` hides instantiation logic, and adapters
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expose uniform `send/receive` APIs. Test doubles are easy to swap in.
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- **Gaps & Ideas:** Some transports share retry/backoff logic that could live in
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a Decorator for clarity.
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Next steps:
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- Introduce a `RetryingTransport` decorator so timeouts/backoff are composable.
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- Document the adapter contract (`open`, `close`, `send_message`) to guide
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community transport additions.
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### Fuzzing Engine (Fit Score: 7/10)
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- **Patterns Used:** Template Method drives fuzzing runs, Observer notifies
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reporters, Mediator coordinates strategies and safety modules.
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- **Strengths:** The engine isolates orchestration from transport details and
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exposes hooks for reporting progress.
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- **Gaps & Ideas:** Template steps are implicit in the engine's methods; naming
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them (`prepare`, `execute`, `finalize`) would make the template clearer.
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Next steps:
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- Refactor engine workflows into explicit template methods to mitigate control
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flow duplication.
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- Introduce mediator interface tests to guarantee event ordering for reporters
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and safety filters.
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### Strategy System (Fit Score: 8/10)
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- **Patterns Used:** Strategy for swapping data generators, Prototype for
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cloning request blueprints, Builder for constructing complex payloads.
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- **Strengths:** Strategies encapsulate data semantics, which keeps fuzzing
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logic simple and testable.
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- **Gaps & Ideas:** The builder/prototype separation is blurred; immutable
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strategy inputs would clarify responsibilities.
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Next steps:
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- Add a registry (simple factory) so experimental strategies can be toggled at
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runtime.
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- Provide examples that show how to extend the `Strategy` interface for new
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domains (tools vs. resources).
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### Safety System (Fit Score: 7/10)
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- **Patterns Used:** Chain of Responsibility for running filters in sequence,
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Decorator for layering mock responses and path blocking.
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- **Strengths:** Safety features remain optional but composable—callers pass in
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the chain entry point.
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- **Gaps & Ideas:** Chains are assembled imperatively; a configuration-driven
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builder would make the pattern more obvious.
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Next steps:
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- Define a `SafetyPolicy` object that declares filter order and parameters.
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- Cover the chain with integration tests to ensure early exits and bypass
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clauses behave as expected.
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### Runtime & Process Management (Fit Score: 8/10)
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- **Patterns Used:** State machine for process lifecycle, Watchdog pattern for
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supervising tasks, Object Pool/resource pool for concurrency limits.
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- **Strengths:** Async primitives plus the watchdog isolate failure domains and
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keep resource usage predictable.
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- **Gaps & Ideas:** Lifecycle transitions are implicit; documenting the state
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diagram would help contributors reason about edge cases.
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Next steps:
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- Add a state transition table (docs or docstring) for the process manager.
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- Consider extracting the process pool into a reusable module for integration
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with future runners.
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### Reporting & Observability (Fit Score: 7/10)
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- **Patterns Used:** Observer pattern for event sinks, Bridge to support JSON
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vs. Console outputs, Adapter for CI-friendly formats.
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- **Strengths:** Reporters subscribe to the same event stream, enabling CLI,
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JSON, and text outputs without touching the engine.
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- **Gaps & Ideas:** Event payloads are tightly coupled to engine internals;
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defining a stable DTO reduces accidental breakages.
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Next steps:
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- Formalize event contracts (schema + version) to help external tooling.
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- Add regression tests to ensure reporters stay backward compatible.
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## Improvement Checklist
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- [ ] Share code snippets in docs showing how to extend each layer.
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- [ ] Automate linting/tests per module to validate pattern intent.
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- [ ] Keep the pattern map updated whenever architecture changes.
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Maintaining this review ensures new contributors can map their work to the
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existing architecture while spotting opportunities for better abstractions.

‎docs/development/contributing.md‎

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4. **Make your changes** with proper testing
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5. **Submit a pull request** with clear description
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### Understanding the Design Patterns
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Before diving into code contributions, we highly recommend reviewing our [Design Pattern Review](../design-pattern-review.md) document. This comprehensive guide is especially valuable for:
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**Beginners:**
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- Learn how design patterns are applied in real-world projects
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- Understand the purpose of each module and its patterns
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- See practical examples of Factory, Strategy, Observer, and other patterns
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**Intermediate Developers:**
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- Review pattern fit scores and understand architectural decisions
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- Identify areas for improvement and contribution opportunities
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- Learn about cross-cutting concerns and modularity observations
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**What the document covers:**
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- Module-by-module pattern analysis with fit scores (0-10)
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- Commentary on what works well and what could be improved
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- Complete pattern map for every module in the codebase
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- Suggested next steps for refactoring and improvements
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**Key sections to review based on your contribution area:**
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- Contributing to CLI → Review "CLI Layer" section
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- Adding transports → Review "Transport Layer" section
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- Improving runtime → Review "Runtime & Process Management" section
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- Enhancing safety → Review "Safety System" section
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This understanding will help you:
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- Write code that fits the existing architecture
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- Identify the right place for new features
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- Understand why certain design decisions were made
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- Propose improvements that align with the project's goals
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## Development Setup
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### Prerequisites

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