---
title: "Implementation Plan Template"
by: "khive-orchestrator"
created: "2025-04-12"
updated: "2025-04-12"
version: "1.1"
description: "Template for creating detailed implementation plans for khive components following TDD principles"
---

# Guidance

**Purpose**\
Plan out the entire coding effort before writing code. Clarify **phases**,
**tasks**, dependencies, test strategy, and acceptance criteria.

**When to Use**

- After design is approved, before actual implementation starts.

**Best Practices**

- Include TDD approach details (e.g., required test coverage).
- Provide a clear sequence of tasks.
- Reference external docs or prior designs.

---

# Implementation Plan: [Component Name]

## 1. Overview

### 1.1 Component Purpose

_Brief summary of the component's purpose and functionality._

### 1.2 Design Reference

_Reference to the approved technical design document._

### 1.3 Implementation Approach

_Summary of the implementation approach, including TDD methodology._

## 2. Implementation Phases

### 2.1 Phase 1: [Name]

_Description of the first implementation phase._

**Key Deliverables:**

- Deliverable 1
- Deliverable 2

**Dependencies:**

- Dependency 1
- Dependency 2

**Estimated Complexity:** [Low/Medium/High]

### 2.2 Phase 2: [Name]

_Description of the second implementation phase._

**Key Deliverables:**

- Deliverable 1
- Deliverable 2

**Dependencies:**

- Dependency 1
- Dependency 2

**Estimated Complexity:** [Low/Medium/High]

_...Add more phases as needed..._

## 3. Test Strategy

### 3.1 Unit Tests

#### 3.1.1 Test Group: [Name]

| ID   | Description                                                     | Fixtures/Mocks | Assertions                    |
| ---- | --------------------------------------------------------------- | -------------- | ----------------------------- |
| UT-1 | Test that function X returns expected result for valid input    | `mock_service` | Result matches expected value |
| UT-2 | Test that function X raises appropriate error for invalid input | `mock_service` | Expected exception is raised  |

#### 3.1.2 Test Group: [Name]

_Similar structure for other units._

### 3.2 Integration Tests

#### 3.2.1 Test Group: [Name]

| ID   | Description                                                    | Setup                                                      | Assertions                                                         |
| ---- | -------------------------------------------------------------- | ---------------------------------------------------------- | ------------------------------------------------------------------ |
| IT-1 | Test that component interacts correctly with dependency Z      | Initialize component with test config                      | Component correctly processes the response from dependency Z       |
| IT-2 | Test that component handles failure of dependency Z gracefully | Initialize component with test config, configure Z to fail | Component handles failure appropriately and returns expected error |

### 3.3 Mock and Stub Requirements

| Dependency         | Mock/Stub Type | Key Behaviors to Mock                                 |
| ------------------ | -------------- | ----------------------------------------------------- |
| External Service X | Mock           | API responses for method A, method B, error scenarios |
| Database           | Stub           | Basic CRUD operations for Entity Y                    |

## 4. Implementation Tasks

### 4.1 Core Framework

| ID  | Task                            | Description                                                       | Dependencies | Priority | Complexity |
| --- | ------------------------------- | ----------------------------------------------------------------- | ------------ | -------- | ---------- |
| T-1 | Create base service class       | Implement the skeleton of the main service class                  | None         | High     | Low        |
| T-2 | Implement configuration loading | Create functionality to load and validate config from environment | T-1          | High     | Low        |

### 4.2 API Layer

| ID  | Task                           | Description                                 | Dependencies | Priority | Complexity |
| --- | ------------------------------ | ------------------------------------------- | ------------ | -------- | ---------- |
| T-3 | Define request/response models | Implement Pydantic models for API contracts | None         | High     | Medium     |
| T-4 | Implement endpoint handlers    | Create handlers for each API endpoint       | T-1, T-3     | High     | Medium     |

### 4.3 Service Layer

| ID  | Task                         | Description                           | Dependencies | Priority | Complexity |
| --- | ---------------------------- | ------------------------------------- | ------------ | -------- | ---------- |
| T-5 | Implement core service logic | Create the main service functionality | T-1, T-2     | High     | High       |
| T-6 | Implement error handling     | Add comprehensive error handling      | T-5          | Medium   | Medium     |

### 4.4 Data Access Layer

| ID  | Task                          | Description                                    | Dependencies | Priority | Complexity |
| --- | ----------------------------- | ---------------------------------------------- | ------------ | -------- | ---------- |
| T-7 | Implement data access objects | Create classes for database interaction        | T-1          | High     | Medium     |
| T-8 | Add caching support           | Implement caching for frequently accessed data | T-7          | Low      | Medium     |

### 4.5 External Integrations

| ID   | Task                              | Description                                      | Dependencies | Priority | Complexity |
| ---- | --------------------------------- | ------------------------------------------------ | ------------ | -------- | ---------- |
| T-9  | Implement external service client | Create client for external service integration   | T-1          | Medium   | Medium     |
| T-10 | Add retry and circuit breaker     | Implement resilience patterns for external calls | T-9          | Low      | Medium     |

## 5. Implementation Sequence

```mermaid
gantt
    title Implementation Sequence
    dateFormat  YYYY-MM-DD

    section Framework
    Create base service class       :t1, 2025-01-01, 1d
    Implement configuration loading :t2, after t1, 1d

    section API Layer
    Define request/response models  :t3, 2025-01-01, 2d
    Implement endpoint handlers     :t4, after t3, 3d

    section Service Layer
    Implement core service logic    :t5, after t2, 5d
    Implement error handling        :t6, after t5, 2d

    section Data Access
    Implement data access objects   :t7, after t2, 3d
    Add caching support             :t8, after t7, 2d

    section External Integrations
    Implement external service client :t9, after t2, 3d
    Add retry and circuit breaker     :t10, after t9, 2d
```

## 6. Acceptance Criteria

### 6.1 Component Level

| ID   | Criterion                                           | Validation Method            |
| ---- | --------------------------------------------------- | ---------------------------- |
| AC-1 | The component successfully processes valid requests | Integration test IT-1        |
| AC-2 | The component correctly handles and reports errors  | Integration tests IT-2, IT-3 |
| AC-3 | The component meets performance requirements        | Performance test PT-1        |

### 6.2 API Level

| ID   | Criterion                                                  | Validation Method          |
| ---- | ---------------------------------------------------------- | -------------------------- |
| AC-4 | All API endpoints return the expected response format      | API tests AT-1, AT-2, AT-3 |
| AC-5 | API input validation correctly identifies invalid requests | API tests AT-4, AT-5       |

## 7. Test Implementation Plan

### 7.1 Test Implementation Sequence

1. Implement base test fixtures and mocks
2. Implement unit tests for core service functionality
3. Implement unit tests for API layer
4. Implement integration tests
5. Implement performance tests

### 7.2 Test Code Examples

#### Unit Test Example

```python
def test_service_processes_valid_input():
    # Arrange
    mock_dependency = MockDependency()
    mock_dependency.return_value = {"key": "value"}
    service = MyService(dependency=mock_dependency)

    # Act
    result = service.process({"id": "123"})

    # Assert
    assert result == {"processed": True, "data": {"key": "value"}}
    mock_dependency.assert_called_once_with("123")
```

#### Integration Test Example

```python
async def test_service_integrates_with_dependency():
    # Arrange
    test_server = TestServer(dependency_app)
    async with test_server.create_client() as client:
        service = MyService(client=client)

        # Act
        result = await service.process({"id": "123"})

        # Assert
        assert result == {"processed": True, "data": {"key": "value"}}
        assert len(test_server.requests) == 1
```

## 8. Implementation Risks and Mitigations

| Risk                                       | Impact | Likelihood | Mitigation                                                                                                  |
| ------------------------------------------ | ------ | ---------- | ----------------------------------------------------------------------------------------------------------- |
| External service API changes               | High   | Medium     | Implement adapter pattern to isolate external service details, add comprehensive integration tests          |
| Performance issues with large data volumes | High   | Low        | Design with pagination support from the start, implement performance tests with realistic data volumes      |
| Complex error handling scenarios           | Medium | Medium     | Implement comprehensive unit tests for error cases, add explicit error handling logic at service boundaries |

## 9. Dependencies and Environment

### 9.1 External Libraries

| Library    | Version | Purpose                                |
| ---------- | ------- | -------------------------------------- |
| FastAPI    | ^0.95.0 | Web framework for API endpoints        |
| Pydantic   | ^1.10.0 | Data validation and models             |
| SQLAlchemy | ^2.0.0  | Database ORM                           |
| httpx      | ^0.24.0 | HTTP client for external service calls |

### 9.2 Environment Setup

```bash
# Create virtual environment
python -m venv venv
source venv/bin/activate

# Install dependencies
pip install -r requirements.txt

# Set up development environment variables
export SERVICE_PORT=8000
export DATABASE_URL="postgresql://user:password@localhost/dbname"
```

## 10. Additional Resources

### 10.1 Reference Implementation

_Link to any existing code that can serve as a reference._

### 10.2 Relevant Documentation

_Links to documentation for key libraries or external services._

### 10.3 Design Patterns

_Specific design patterns to be applied during implementation._
