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03_implementation_planning.md

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Phase 3: Implementation Planning

Create detailed plan for making code match documentation exactly

Goal

Create comprehensive plan showing how code will match documentation. Understand full scope before coding.

Why plan first: Reveals dependencies, complexity, proper sequencing. Prevents mid-implementation surprises.

The Steps

Step 1: Code Reconnaissance

Use file crawling to understand current state:

# Generate index of code files
find amplifier-core amplifier-app-cli -type f -name "*.py" \
  ! -path "*/__pycache__/*" ! -path "*/.venv/*" \
  > /tmp/code_files.txt

# Process systematically
# For each file: read, understand, note changes needed

If conflicts detected between docs and code:

⚠️ PAUSE: Present to human with options. See context poisoning detection.

Step 2: Create Implementation Specification

Document exactly what needs to change:

# Implementation Plan - [Feature Name]

## Current State
- ✅ What exists and works
- ❌ What's missing
- ⚠️ What needs modification

## Changes Required

### Core Classes
**File**: path/to/file.py
**Purpose**: What it does
**Methods**: List of methods
**Dependencies**: What it needs
**Estimated lines**: ~150
**Philosophy check**: Mechanism/policy alignment

[... detailed breakdown ...]

## Dependencies Between Changes
1. X depends on Y (build Y first)
2. Z requires X and Y (build last)

## Proper Sequencing
Phase 1: Core classes (foundation)
Phase 2: Commands (builds on core)
Phase 3: Tests (validates)

## Complexity Check
- New abstractions: 2
- Justification: Why needed
- Alternative: What else considered
- Why chosen: Reasoning

## Estimated Effort
- Component A: 2-3 hours
- Component B: 1-2 hours
Total: 8-11 hours, +850 lines

## Philosophy Compliance
- ✅ Ruthless simplicity
- ✅ Bricks and studs
- ✅ Right-sized modules

Step 3: Right-Sizing Check

Each chunk should:

  • ✅ Fit in AI context window (~4000-8000 lines)
  • ✅ Have clear boundaries
  • ✅ Be independently testable
  • ✅ Be regeneratable from spec

If too large: Break into smaller modules with clear interfaces.

Output of Phase 3

When complete:

  • ✅ Detailed implementation plan documented
  • ✅ Work properly right-sized
  • ✅ Dependencies identified
  • ✅ Sequencing determined
  • ✅ Conflicts resolved
  • ✅ Philosophy alignment verified

Ready for: Phase 4: Code Implementation

Return to: Phases | Main Index

Prerequisites: Phase 2: Approval Gate

Core Techniques: File Crawling

Philosophy: MODULAR_DESIGN_PHILOSOPHY.md