Agent skill

component-model-analysis

Evaluate extensibility patterns, abstraction layers, and configuration approaches in frameworks. Use when (1) assessing base class/protocol design, (2) understanding dependency injection patterns, (3) evaluating plugin/extension systems, (4) comparing code-first vs config-first approaches, or (5) determining framework flexibility for customization.

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SKILL.md

Component Model Analysis

Evaluates extensibility patterns and configuration approaches.

Process

  1. Identify base classes — Find BaseLLM, BaseTool, BaseAgent, etc.
  2. Classify abstraction depth — Thick (lots of logic) vs thin (interfaces)
  3. Analyze DI patterns — Constructor, factory, registry, container
  4. Document configuration — Code-first, config-first, or hybrid

Abstraction Layer Assessment

Thick Abstractions

python
class BaseLLM(ABC):
    """Many methods, lots of inherited behavior"""
    
    def __init__(self, model: str, temperature: float = 0.7):
        self.model = model
        self.temperature = temperature
        self._cache = {}
    
    def generate(self, prompt: str) -> str:
        cached = self._check_cache(prompt)
        if cached:
            return cached
        result = self._generate_impl(prompt)
        self._update_cache(prompt, result)
        return self._postprocess(result)
    
    @abstractmethod
    def _generate_impl(self, prompt: str) -> str: ...
    
    def _check_cache(self, prompt): ...
    def _update_cache(self, prompt, result): ...
    def _postprocess(self, result): ...
    def stream(self, prompt): ...
    def batch(self, prompts): ...
    # ... 15+ more methods

Characteristics:

  • Deep inheritance trees (3+ levels)
  • Many non-abstract methods
  • Shared state/caching logic
  • Hard to understand full behavior

Thin Abstractions (Protocols)

python
from typing import Protocol

class LLM(Protocol):
    """Minimal interface contract"""
    
    def generate(self, messages: list[Message]) -> str: ...

class StreamingLLM(Protocol):
    def stream(self, messages: list[Message]) -> Iterator[str]: ...

Characteristics:

  • Pure interfaces
  • No inherited behavior
  • Duck typing compatible
  • Easy to mock/test

Mixed Approach

python
class LLMBase(ABC):
    """Some shared logic, but minimal"""
    
    @abstractmethod
    def generate(self, messages: list) -> str: ...
    
    def generate_with_retry(self, messages: list, retries: int = 3) -> str:
        """Optional convenience method"""
        for i in range(retries):
            try:
                return self.generate(messages)
            except RateLimitError:
                time.sleep(2 ** i)
        raise

Dependency Injection Patterns

Constructor Injection

python
class Agent:
    def __init__(
        self,
        llm: LLM,
        tools: list[Tool],
        memory: Memory | None = None
    ):
        self.llm = llm
        self.tools = tools
        self.memory = memory or InMemoryStore()

Pros: Explicit, testable, IDE support Cons: Verbose construction, manual wiring

Factory Pattern

python
class Agent:
    @classmethod
    def from_config(cls, config: AgentConfig) -> "Agent":
        llm = LLMFactory.create(config.llm)
        tools = [ToolFactory.create(t) for t in config.tools]
        return cls(llm=llm, tools=tools)
    
    @classmethod
    def from_yaml(cls, path: str) -> "Agent":
        config = yaml.safe_load(open(path))
        return cls.from_config(AgentConfig(**config))

Pros: Flexible construction, config-driven Cons: Hidden dependencies, magic

Global Registry

python
TOOL_REGISTRY: dict[str, type[Tool]] = {}

def register_tool(name: str):
    def decorator(cls):
        TOOL_REGISTRY[name] = cls
        return cls
    return decorator

@register_tool("search")
class SearchTool(Tool): ...

# Usage
tool = TOOL_REGISTRY["search"]()

Pros: Plugin-friendly, discoverable Cons: Global state, harder to test, implicit

Container-Based DI

python
from dependency_injector import containers, providers

class Container(containers.DeclarativeContainer):
    config = providers.Configuration()
    
    llm = providers.Singleton(
        OpenAI,
        api_key=config.openai.api_key
    )
    
    agent = providers.Factory(
        Agent,
        llm=llm
    )

Pros: Full lifecycle control, scopes Cons: Complex, learning curve

Configuration Strategy

Code-First

python
agent = Agent(
    llm=OpenAI(model="gpt-4", temperature=0.7),
    tools=[SearchTool(), CalculatorTool()],
    max_steps=10
)

Characteristics: Type-safe, IDE completion, refactorable

Config-First

yaml
# agent.yaml
llm:
  provider: openai
  model: gpt-4
  temperature: 0.7
tools:
  - search
  - calculator
max_steps: 10
python
agent = Agent.from_yaml("agent.yaml")

Characteristics: Non-developer friendly, runtime changes, less type safety

Hybrid

python
# Base config from file
base = AgentConfig.from_yaml("agent.yaml")

# Code overrides
agent = Agent(
    **base.dict(),
    llm=CustomLLM()  # Override specific component
)

Output Template

markdown
## Component Model Analysis: [Framework Name]

### Abstraction Assessment

| Component | Base Class | Depth | Type |
|-----------|-----------|-------|------|
| LLM | BaseLLM | 3 levels | Thick |
| Tool | BaseTool | 2 levels | Mixed |
| Memory | Protocol | 0 levels | Thin |

### Dependency Injection
- **Primary Pattern**: [Constructor/Factory/Registry/Container]
- **Testability**: [Easy/Medium/Hard]
- **Configuration**: [Code/Config/Hybrid]

### Extension Points

| Extension | Mechanism | Difficulty |
|-----------|-----------|------------|
| Custom LLM | Inherit BaseLLM | Medium |
| Custom Tool | @register_tool | Easy |
| Custom Memory | Implement Protocol | Easy |

### Configuration
- **Strategy**: [Code-first/Config-first/Hybrid]
- **Formats**: [Python/YAML/JSON/TOML]
- **Validation**: [Pydantic/Manual/None]

### Recommendations
- [List any concerns or suggestions]

Integration

  • Prerequisite: codebase-mapping to identify base classes
  • Feeds into: comparative-matrix for extensibility decisions
  • Related: antipattern-catalog for inheritance issues

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