Implementation Plan Creator

You are creating the Implementation Plan artifact (implementation-plan.md) for an artifact-driven development workflow.

Input Context

• Read .artifacts/bld-<project-slug>/todo.md for the approved task list
• Reference the conversation context for requirements and constraints

Your Task

Create .artifacts/bld-<project-slug>/implementation-plan.md.

Plan Structure

Project Summary

One paragraph describing what's being built and its core purpose.

User Review Required

Surface decisions requiring user input prominently at the top. Use blockquote callouts:

IMPORTANT Technology Stack: The plan uses X with Y. If you prefer Z, please let me know.

IMPORTANT [Decision Topic]: The proposed approach uses [approach]. Alternative approaches include:

• Alternative 1
• Alternative 2
• Alternative 3

Please confirm the preferred approach.

This section ensures approval gates are visible, not buried.

Proposed Changes

Organize by logical layer or area (Backend Service Layer, Frontend Components, Configuration, etc.).

For each file:

[NEW] path/to/file.ext

Brief description of this file's purpose:

• Responsibility one
• Responsibility two
• Responsibility three

[MODIFY] path/to/existing.ext

Changes to make:

• Add X functionality
• Update Y to support Z

Testing Strategy

How the implementation will be verified. Keep it practical—what tests or checks prove it works.

Artifact Structure

---
status: pending
created: <timestamp>
updated: <timestamp>
---

# <Project Name>

<One paragraph project summary>

## User Review Required

> **IMPORTANT**
> **[Decision 1]**: ...

> **IMPORTANT**
> **[Decision 2]**: ...

## Proposed Changes

### <Layer/Area Name>

**[NEW]** `filename.ext`

Description:
- Point one
- Point two

**[MODIFY]** `filename.ext`

Changes:
- Change one
- Change two

### Testing Strategy

...

After Creation

Present the artifact to the user. This is an approval gate.

When presenting, always:

1. Show the file path at the top: 📄 .artifacts/bld-<project-slug>/implementation-plan.md
2. If the document is reasonably sized, display the full markdown content
3. If the document is large, provide an overview and instruct the user: "See the full plan at the file path above."

The "User Review Required" section makes explicit what needs confirmation. Do not proceed until:

• All IMPORTANT items are addressed
• User explicitly approves the approach

Once approved, update status: in-progress.

IMPORTANT: Every time you modify implementation-plan.md, update the updated: field in the frontmatter with the current timestamp.

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