# Context Engineering API Reference

**Version**: 1.0
**Updated**: 2025-12-29
**Module**: `optimization_engine.context`

This document provides complete API documentation for the Atomizer Context Engineering (ACE) framework.

---

## Table of Contents

1. [Module Overview](#module-overview)
2. [Core Classes](#core-classes)
   - [AtomizerPlaybook](#atomizerplaybook)
   - [PlaybookItem](#playbookitem)
   - [InsightCategory](#insightcategory)
3. [Session Management](#session-management)
   - [AtomizerSessionState](#atomizersessionstate)
   - [ExposedState](#exposedstate)
   - [IsolatedState](#isolatedstate)
   - [TaskType](#tasktype)
4. [Analysis & Learning](#analysis--learning)
   - [AtomizerReflector](#atomizerreflector)
   - [FeedbackLoop](#feedbackloop)
5. [Optimization](#optimization)
   - [CompactionManager](#compactionmanager)
   - [ContextCacheOptimizer](#contextcacheoptimizer)
6. [Integration](#integration)
   - [ContextEngineeringMixin](#contextengineeringmixin)
   - [ContextAwareRunner](#contextawarerunner)
7. [REST API](#rest-api)

---

## Module Overview

### Import Patterns

```python
# Full import
from optimization_engine.context import (
    # Core playbook
    AtomizerPlaybook,
    PlaybookItem,
    InsightCategory,

    # Session management
    AtomizerSessionState,
    ExposedState,
    IsolatedState,
    TaskType,
    get_session,

    # Analysis
    AtomizerReflector,
    OptimizationOutcome,
    InsightCandidate,

    # Learning
    FeedbackLoop,
    FeedbackLoopFactory,

    # Optimization
    CompactionManager,
    ContextEvent,
    EventType,
    ContextBudgetManager,
    ContextCacheOptimizer,
    CacheStats,
    StablePrefixBuilder,

    # Integration
    ContextEngineeringMixin,
    ContextAwareRunner,
)

# Convenience imports
from optimization_engine.context import AtomizerPlaybook, get_session
```

---

## Core Classes

### AtomizerPlaybook

The central knowledge store for persistent learning across sessions.

#### Constructor

```python
AtomizerPlaybook(
    items: Dict[str, PlaybookItem] = None,
    version: int = 1,
    created_at: str = None,
    last_updated: str = None
)
```

#### Class Methods

##### `load(path: Path) -> AtomizerPlaybook`
Load playbook from JSON file.

```python
playbook = AtomizerPlaybook.load(Path("knowledge_base/playbook.json"))
```

**Parameters:**
- `path`: Path to JSON file

**Returns:** AtomizerPlaybook instance

**Raises:** FileNotFoundError if file doesn't exist (creates new if not found)

---

#### Instance Methods

##### `save(path: Path) -> None`
Save playbook to JSON file.

```python
playbook.save(Path("knowledge_base/playbook.json"))
```

---

##### `add_insight(category, content, source_trial=None, tags=None) -> PlaybookItem`
Add a new insight to the playbook.

```python
item = playbook.add_insight(
    category=InsightCategory.STRATEGY,
    content="CMA-ES converges faster on smooth surfaces",
    source_trial=42,
    tags=["sampler", "convergence", "mirror"]
)
```

**Parameters:**
- `category` (InsightCategory): Category of the insight
- `content` (str): The insight content
- `source_trial` (int, optional): Trial number that generated this insight
- `tags` (List[str], optional): Tags for filtering

**Returns:** The created PlaybookItem

---

##### `record_outcome(item_id: str, helpful: bool) -> None`
Record whether an insight was helpful or harmful.

```python
playbook.record_outcome("str_001", helpful=True)
playbook.record_outcome("mis_003", helpful=False)
```

**Parameters:**
- `item_id` (str): ID of the playbook item
- `helpful` (bool): True if helpful, False if harmful

---

##### `get_context_for_task(task_type, max_items=15, min_confidence=0.5) -> str`
Get formatted context string for LLM consumption.

```python
context = playbook.get_context_for_task(
    task_type="optimization",
    max_items=15,
    min_confidence=0.5
)
```

**Parameters:**
- `task_type` (str): Type of task for filtering
- `max_items` (int): Maximum items to include
- `min_confidence` (float): Minimum confidence threshold (0.0-1.0)

**Returns:** Formatted string suitable for LLM context

---

##### `get_by_category(category, min_score=0) -> List[PlaybookItem]`
Get items filtered by category.

```python
mistakes = playbook.get_by_category(InsightCategory.MISTAKE, min_score=-2)
```

**Parameters:**
- `category` (InsightCategory): Category to filter by
- `min_score` (int): Minimum net score

**Returns:** List of matching PlaybookItems

---

##### `get_stats() -> Dict`
Get playbook statistics.

```python
stats = playbook.get_stats()
# Returns:
# {
#     "total_items": 45,
#     "by_category": {"STRATEGY": 12, "MISTAKE": 8, ...},
#     "version": 3,
#     "last_updated": "2025-12-29T10:30:00",
#     "avg_score": 2.4,
#     "max_score": 15,
#     "min_score": -3
# }
```

---

##### `prune_harmful(threshold=-3) -> int`
Remove items with net score below threshold.

```python
removed_count = playbook.prune_harmful(threshold=-3)
```

**Parameters:**
- `threshold` (int): Items with net_score <= threshold are removed

**Returns:** Number of items removed

---

### PlaybookItem

Dataclass representing a single playbook entry.

```python
@dataclass
class PlaybookItem:
    id: str                          # e.g., "str_001", "mis_003"
    category: InsightCategory        # Category enum
    content: str                     # The insight text
    helpful_count: int = 0           # Times marked helpful
    harmful_count: int = 0           # Times marked harmful
    tags: List[str] = field(default_factory=list)
    source_trial: Optional[int] = None
    created_at: str = ""             # ISO timestamp
    last_used: Optional[str] = None  # ISO timestamp
```

#### Properties

```python
item.net_score      # helpful_count - harmful_count
item.confidence     # helpful / (helpful + harmful), or 0.5 if no feedback
```

#### Methods

```python
# Convert to context string for LLM
context_str = item.to_context_string()
# "[str_001] helpful=5 harmful=0 :: CMA-ES converges faster..."
```

---

### InsightCategory

Enum for categorizing insights.

```python
class InsightCategory(Enum):
    STRATEGY = "str"      # Optimization strategies that work
    CALCULATION = "cal"   # Formulas and calculations
    MISTAKE = "mis"       # Common mistakes to avoid
    TOOL = "tool"         # Tool usage patterns
    DOMAIN = "dom"        # Domain-specific knowledge (FEA, NX)
    WORKFLOW = "wf"       # Workflow patterns
```

**Usage:**
```python
# Create with enum
category = InsightCategory.STRATEGY

# Create from string
category = InsightCategory("str")

# Get string value
value = InsightCategory.STRATEGY.value  # "str"
```

---

## Session Management

### AtomizerSessionState

Manages session context with exposed/isolated separation.

#### Constructor

```python
session = AtomizerSessionState(
    session_id: str = None  # Auto-generated UUID if not provided
)
```

#### Attributes

```python
session.session_id      # Unique session identifier
session.exposed         # ExposedState - always in LLM context
session.isolated        # IsolatedState - on-demand access only
session.last_updated    # ISO timestamp of last update
```

#### Methods

##### `get_llm_context() -> str`
Get exposed state formatted for LLM context.

```python
context = session.get_llm_context()
# Returns formatted string with task type, study info, progress, etc.
```

---

##### `add_action(action: str) -> None`
Record an action (keeps last 20).

```python
session.add_action("Started optimization with TPE sampler")
```

---

##### `add_error(error: str, error_type: str = None) -> None`
Record an error (keeps last 10).

```python
session.add_error("NX solver timeout after 600s", error_type="solver")
```

---

##### `to_dict() / from_dict(data) -> AtomizerSessionState`
Serialize/deserialize session state.

```python
# Save
data = session.to_dict()

# Restore
session = AtomizerSessionState.from_dict(data)
```

---

### ExposedState

State that's always included in LLM context.

```python
@dataclass
class ExposedState:
    task_type: Optional[TaskType] = None
    study_name: Optional[str] = None
    study_status: str = "idle"
    trials_completed: int = 0
    trials_total: int = 0
    best_value: Optional[float] = None
    recent_actions: List[str] = field(default_factory=list)  # Last 20
    recent_errors: List[str] = field(default_factory=list)   # Last 10
```

---

### IsolatedState

State available on-demand but not in default context.

```python
@dataclass
class IsolatedState:
    full_trial_history: List[Dict] = field(default_factory=list)
    detailed_errors: List[Dict] = field(default_factory=list)
    performance_metrics: Dict = field(default_factory=dict)
    debug_info: Dict = field(default_factory=dict)
```

---

### TaskType

Enum for session task classification.

```python
class TaskType(Enum):
    CREATE_STUDY = "create_study"
    RUN_OPTIMIZATION = "run_optimization"
    MONITOR_PROGRESS = "monitor_progress"
    ANALYZE_RESULTS = "analyze_results"
    DEBUG_ERROR = "debug_error"
    CONFIGURE_SETTINGS = "configure_settings"
    NEURAL_ACCELERATION = "neural_acceleration"
```

---

### get_session()

Get or create the global session instance.

```python
from optimization_engine.context import get_session

session = get_session()
session.exposed.task_type = TaskType.RUN_OPTIMIZATION
```

---

## Analysis & Learning

### AtomizerReflector

Analyzes optimization outcomes and extracts insights.

#### Constructor

```python
reflector = AtomizerReflector(playbook: AtomizerPlaybook)
```

#### Methods

##### `analyze_outcome(outcome: OptimizationOutcome) -> List[InsightCandidate]`
Analyze an optimization outcome for insights.

```python
outcome = OptimizationOutcome(
    study_name="bracket_v3",
    trial_number=42,
    params={'thickness': 10.5},
    objectives={'mass': 5.2},
    constraints_satisfied=True,
    error_message=None,
    solve_time=45.2
)

insights = reflector.analyze_outcome(outcome)
for insight in insights:
    print(f"{insight.category}: {insight.content}")
```

---

##### `extract_error_insights(error_message: str) -> List[InsightCandidate]`
Extract insights from error messages.

```python
insights = reflector.extract_error_insights("Solution did not converge within tolerance")
# Returns insights about convergence failures
```

---

### OptimizationOutcome

Dataclass for optimization trial outcomes.

```python
@dataclass
class OptimizationOutcome:
    study_name: str
    trial_number: int
    params: Dict[str, Any]
    objectives: Dict[str, float]
    constraints_satisfied: bool
    error_message: Optional[str] = None
    solve_time: Optional[float] = None
```

---

### FeedbackLoop

Automated learning from optimization execution.

#### Constructor

```python
feedback = FeedbackLoop(playbook_path: Path)
```

#### Methods

##### `process_trial_result(trial_number, params, objectives, is_feasible, error=None)`
Process a trial result for learning opportunities.

```python
feedback.process_trial_result(
    trial_number=42,
    params={'thickness': 10.5, 'width': 25.0},
    objectives={'mass': 5.2, 'stress': 180.0},
    is_feasible=True,
    error=None
)
```

---

##### `finalize_study(study_summary: Dict) -> Dict`
Finalize learning at end of optimization study.

```python
result = feedback.finalize_study({
    "name": "bracket_v3",
    "total_trials": 100,
    "best_value": 4.8,
    "convergence_rate": 0.95
})
# Returns: {"insights_added": 3, "patterns_identified": ["fast_convergence"]}
```

---

## Optimization

### CompactionManager

Handles context compaction for long-running sessions.

#### Constructor

```python
compactor = CompactionManager(
    max_events: int = 100,
    preserve_errors: bool = True,
    preserve_milestones: bool = True
)
```

#### Methods

##### `add_event(event: ContextEvent) -> None`
Add an event to the session history.

```python
from optimization_engine.context import ContextEvent, EventType

event = ContextEvent(
    event_type=EventType.TRIAL_COMPLETE,
    content="Trial 42 completed: mass=5.2kg",
    timestamp=datetime.now().isoformat(),
    is_error=False,
    is_milestone=False
)
compactor.add_event(event)
```

---

##### `maybe_compact() -> Optional[str]`
Compact events if over threshold.

```python
summary = compactor.maybe_compact()
if summary:
    print(f"Compacted: {summary}")
```

---

##### `get_context() -> str`
Get current context string.

```python
context = compactor.get_context()
```

---

### ContextCacheOptimizer

Monitors and optimizes KV-cache efficiency.

#### Constructor

```python
optimizer = ContextCacheOptimizer()
```

#### Methods

##### `track_request(prefix_tokens: int, total_tokens: int)`
Track a request for cache analysis.

```python
optimizer.track_request(prefix_tokens=5000, total_tokens=15000)
```

---

##### `track_completion(success: bool, response_tokens: int)`
Track completion for performance analysis.

```python
optimizer.track_completion(success=True, response_tokens=500)
```

---

##### `get_stats_dict() -> Dict`
Get cache statistics.

```python
stats = optimizer.get_stats_dict()
# Returns:
# {
#     "total_requests": 150,
#     "cache_hits": 120,
#     "cache_hit_rate": 0.8,
#     "avg_prefix_ratio": 0.33,
#     ...
# }
```

---

##### `get_report() -> str`
Get human-readable report.

```python
report = optimizer.get_report()
print(report)
```

---

## Integration

### ContextEngineeringMixin

Mixin class for adding context engineering to optimization runners.

```python
class ContextEngineeringMixin:
    def init_context_engineering(self, playbook_path: Path):
        """Initialize context engineering components."""

    def record_trial_outcome(self, trial_number, params, objectives,
                            is_feasible, error=None):
        """Record trial outcome for learning."""

    def get_context_for_llm(self) -> str:
        """Get combined context for LLM consumption."""

    def finalize_context_engineering(self, study_summary: Dict):
        """Finalize learning at study completion."""
```

---

### ContextAwareRunner

Pre-built runner with context engineering enabled.

```python
from optimization_engine.context import ContextAwareRunner

runner = ContextAwareRunner(
    config=config_dict,
    playbook_path=Path("knowledge_base/playbook.json")
)

# Run optimization with automatic learning
runner.run()
```

---

## REST API

The Context Engineering module exposes REST endpoints via FastAPI.

### Base URL
```
http://localhost:5000/api/context
```

### Endpoints

#### GET `/playbook`
Get playbook summary statistics.

**Response:**
```json
{
    "total_items": 45,
    "by_category": {"STRATEGY": 12, "MISTAKE": 8},
    "version": 3,
    "last_updated": "2025-12-29T10:30:00",
    "avg_score": 2.4,
    "top_score": 15,
    "lowest_score": -3
}
```

---

#### GET `/playbook/items`
List playbook items with optional filters.

**Query Parameters:**
- `category` (str): Filter by category (str, mis, tool, cal, dom, wf)
- `min_score` (int): Minimum net score (default: 0)
- `min_confidence` (float): Minimum confidence (default: 0.0)
- `limit` (int): Max items (default: 50)
- `offset` (int): Pagination offset (default: 0)

**Response:**
```json
[
    {
        "id": "str_001",
        "category": "str",
        "content": "CMA-ES converges faster on smooth surfaces",
        "helpful_count": 5,
        "harmful_count": 0,
        "net_score": 5,
        "confidence": 1.0,
        "tags": ["sampler", "convergence"],
        "created_at": "2025-12-29T10:00:00",
        "last_used": "2025-12-29T10:30:00"
    }
]
```

---

#### GET `/playbook/items/{item_id}`
Get a specific playbook item.

**Response:** Single PlaybookItemResponse object

---

#### POST `/playbook/feedback`
Record feedback on a playbook item.

**Request Body:**
```json
{
    "item_id": "str_001",
    "helpful": true
}
```

**Response:**
```json
{
    "item_id": "str_001",
    "new_score": 6,
    "new_confidence": 1.0,
    "helpful_count": 6,
    "harmful_count": 0
}
```

---

#### POST `/playbook/insights`
Add a new insight.

**Request Body:**
```json
{
    "category": "str",
    "content": "New insight content",
    "tags": ["tag1", "tag2"],
    "source_trial": 42
}
```

**Response:**
```json
{
    "item_id": "str_015",
    "category": "str",
    "content": "New insight content",
    "message": "Insight added successfully"
}
```

---

#### DELETE `/playbook/items/{item_id}`
Delete a playbook item.

**Response:**
```json
{
    "deleted": "str_001",
    "content_preview": "CMA-ES converges faster..."
}
```

---

#### POST `/playbook/prune`
Remove harmful items.

**Query Parameters:**
- `threshold` (int): Net score threshold (default: -3)

**Response:**
```json
{
    "items_pruned": 3,
    "threshold_used": -3,
    "remaining_items": 42
}
```

---

#### GET `/playbook/context`
Get playbook context for LLM consumption.

**Query Parameters:**
- `task_type` (str): Task type (default: "optimization")
- `max_items` (int): Maximum items (default: 15)
- `min_confidence` (float): Minimum confidence (default: 0.5)

**Response:**
```json
{
    "context": "## Atomizer Knowledge Base\n...",
    "items_included": 15,
    "task_type": "optimization"
}
```

---

#### GET `/session`
Get current session state.

**Response:**
```json
{
    "session_id": "abc123",
    "task_type": "run_optimization",
    "study_name": "bracket_v3",
    "study_status": "running",
    "trials_completed": 42,
    "trials_total": 100,
    "best_value": 5.2,
    "recent_actions": ["Started optimization", "Trial 42 complete"],
    "recent_errors": []
}
```

---

#### GET `/session/context`
Get session context for LLM consumption.

**Response:**
```json
{
    "context": "## Current Session\nTask: run_optimization\n...",
    "session_id": "abc123",
    "last_updated": "2025-12-29T10:30:00"
}
```

---

#### GET `/cache/stats`
Get KV-cache statistics.

**Response:**
```json
{
    "stats": {
        "total_requests": 150,
        "cache_hits": 120,
        "cache_hit_rate": 0.8
    },
    "report": "Cache Performance Report\n..."
}
```

---

#### GET `/learning/report`
Get comprehensive learning report.

**Response:**
```json
{
    "generated_at": "2025-12-29T10:30:00",
    "playbook_stats": {...},
    "top_performers": [
        {"id": "str_001", "content": "...", "score": 15}
    ],
    "worst_performers": [
        {"id": "mis_003", "content": "...", "score": -2}
    ],
    "recommendations": [
        "Consider pruning 3 harmful items (net_score < -3)"
    ]
}
```

---

## Error Handling

All API endpoints return appropriate HTTP status codes:

| Code | Meaning |
|------|---------|
| 200 | Success |
| 400 | Bad request (invalid parameters) |
| 404 | Not found (item doesn't exist) |
| 500 | Server error (module not available) |

Error response format:
```json
{
    "detail": "Error description"
}
```

---

## See Also

- [Context Engineering Report](../CONTEXT_ENGINEERING_REPORT.md) - Full implementation report
- [SYS_18 Protocol](../protocols/system/SYS_18_CONTEXT_ENGINEERING.md) - System protocol
- [Cheatsheet](../../.claude/skills/01_CHEATSHEET.md) - Quick reference