Plans follow a hierarchical Phase → Step structure designed for systematic implementation.
Structure
## Phase 1: <Title>
Brief description of what this phase accomplishes.
### Phase Validation
```bash
# Command(s) to verify the entire phase is complete
Step 1: <a class=headerlink href=#step-1 title="Permanent link">¶</a></h3> <h4 id=goal>Goal<a class=headerlink href=#goal title="Permanent link">¶</a></h4> <p>What this step accomplishes.</p> <h4 id=files>Files<a class=headerlink href=#files title="Permanent link">¶</a></h4> <ul> <li><code>path/to/file.py</code> - What changes to make</li> </ul> <h4 id=validation>Validation<a class=headerlink href=#validation title="Permanent link">¶</a></h4> <div class="language-bash highlight"><pre><span></span><code><span id=__span-1-1><a id=__codelineno-1-1 name=__codelineno-1-1 href=#__codelineno-1-1></a><span class=c1># Command to verify this step works</span>
</span></code></pre></div> <h4 id=failure-modes>Failure modes<a class=headerlink href=#failure-modes title="Permanent link">¶</a></h4> <ul> <li>What could go wrong and how to detect it</li> </ul> <hr> <h3 id=step-2>Step 2: <title><a class=headerlink href=#step-2 title="Permanent link">¶</a></h3> <p>...</p> <h2 id=phase-2>Phase 2: <title><a class=headerlink href=#phase-2 title="Permanent link">¶</a></h2> <h3 id=step-1_1>Step 1: <title><a class=headerlink href=#step-1_1 title="Permanent link">¶</a></h3> <p>(Step numbers restart at 1 for each phase) ... <div class="language-text highlight"><pre><span></span><code><span id=__span-2-1><a id=__codelineno-2-1 name=__codelineno-2-1 href=#__codelineno-2-1></a>## Phase Guidelines
</span><span id=__span-2-2><a id=__codelineno-2-2 name=__codelineno-2-2 href=#__codelineno-2-2></a>
</span><span id=__span-2-3><a id=__codelineno-2-3 name=__codelineno-2-3 href=#__codelineno-2-3></a>- Each phase is a logical milestone (e.g., "Data Models", "Core Logic", "CLI Integration")
</span><span id=__span-2-4><a id=__codelineno-2-4 name=__codelineno-2-4 href=#__codelineno-2-4></a>- Phases are incremental - each builds on the foundation of previous phases
</span><span id=__span-2-5><a id=__codelineno-2-5 name=__codelineno-2-5 href=#__codelineno-2-5></a>- Include Phase Validation to verify the entire phase works before moving on
</span><span id=__span-2-6><a id=__codelineno-2-6 name=__codelineno-2-6 href=#__codelineno-2-6></a>
</span><span id=__span-2-7><a id=__codelineno-2-7 name=__codelineno-2-7 href=#__codelineno-2-7></a>## Step Guidelines
</span><span id=__span-2-8><a id=__codelineno-2-8 name=__codelineno-2-8 href=#__codelineno-2-8></a>
</span><span id=__span-2-9><a id=__codelineno-2-9 name=__codelineno-2-9 href=#__codelineno-2-9></a>- Step numbers restart at 1 within each phase
</span><span id=__span-2-10><a id=__codelineno-2-10 name=__codelineno-2-10 href=#__codelineno-2-10></a>- Each step should be atomic and independently verifiable
</span><span id=__span-2-11><a id=__codelineno-2-11 name=__codelineno-2-11 href=#__codelineno-2-11></a>- Include specific file paths and validation commands
</span><span id=__span-2-12><a id=__codelineno-2-12 name=__codelineno-2-12 href=#__codelineno-2-12></a>
</span><span id=__span-2-13><a id=__codelineno-2-13 name=__codelineno-2-13 href=#__codelineno-2-13></a>## Completion Tracking
</span><span id=__span-2-14><a id=__codelineno-2-14 name=__codelineno-2-14 href=#__codelineno-2-14></a>
</span><span id=__span-2-15><a id=__codelineno-2-15 name=__codelineno-2-15 href=#__codelineno-2-15></a>When a step is completed by `weld implement`, it's marked in the plan:
</span><span id=__span-2-16><a id=__codelineno-2-16 name=__codelineno-2-16 href=#__codelineno-2-16></a>
</span><span id=__span-2-17><a id=__codelineno-2-17 name=__codelineno-2-17 href=#__codelineno-2-17></a>```markdown
</span><span id=__span-2-18><a id=__codelineno-2-18 name=__codelineno-2-18 href=#__codelineno-2-18></a>### Step 1: Create data models [COMPLETE]
</span></code></pre></div></p> <p>This allows resuming implementation from where you left off.</p> <h2 id=example-plan>Example Plan<a class=headerlink href=#example-plan title="Permanent link">¶</a></h2> <div class="language-markdown highlight"><pre><span></span><code><span id=__span-3-1><a id=__codelineno-3-1 name=__codelineno-3-1 href=#__codelineno-3-1></a><span class=gu>## Phase 1: Data Models</span>
</span><span id=__span-3-2><a id=__codelineno-3-2 name=__codelineno-3-2 href=#__codelineno-3-2></a>
</span><span id=__span-3-3><a id=__codelineno-3-3 name=__codelineno-3-3 href=#__codelineno-3-3></a>Define the core data structures for the feature.
</span><span id=__span-3-4><a id=__codelineno-3-4 name=__codelineno-3-4 href=#__codelineno-3-4></a>
</span><span id=__span-3-5><a id=__codelineno-3-5 name=__codelineno-3-5 href=#__codelineno-3-5></a><span class=gu>### Phase Validation</span>
</span><span id=__span-3-6><a id=__codelineno-3-6 name=__codelineno-3-6 href=#__codelineno-3-6></a>```bash
</span><span id=__span-3-7><a id=__codelineno-3-7 name=__codelineno-3-7 href=#__codelineno-3-7></a>python -c "from myapp.models import User; print('OK')"
</span></code></pre></div> <h3 id=step-1-create-user-model>Step 1: Create User model<a class=headerlink href=#step-1-create-user-model title="Permanent link">¶</a></h3> <h4 id=goal_1>Goal<a class=headerlink href=#goal_1 title="Permanent link">¶</a></h4> <p>Define the User model with authentication fields.</p> <h4 id=files_1>Files<a class=headerlink href=#files_1 title="Permanent link">¶</a></h4> <ul> <li><code>src/myapp/models/user.py</code> - Create User class with email, password_hash</li> </ul> <h4 id=validation_1>Validation<a class=headerlink href=#validation_1 title="Permanent link">¶</a></h4> <div class="language-bash highlight"><pre><span></span><code><span id=__span-4-1><a id=__codelineno-4-1 name=__codelineno-4-1 href=#__codelineno-4-1></a>pytest<span class=w> </span>tests/test_models.py<span class=w> </span>-v
</span></code></pre></div> <h4 id=failure-modes_1>Failure modes<a class=headerlink href=#failure-modes_1 title="Permanent link">¶</a></h4> <ul> <li>Import errors if dependencies missing</li> <li>Validation errors if fields incorrectly typed</li> </ul> <hr> <h3 id=step-2-add-database-migration>Step 2: Add database migration<a class=headerlink href=#step-2-add-database-migration title="Permanent link">¶</a></h3> <h4 id=goal_2>Goal<a class=headerlink href=#goal_2 title="Permanent link">¶</a></h4> <p>Create migration for User table.</p> <h4 id=files_2>Files<a class=headerlink href=#files_2 title="Permanent link">¶</a></h4> <ul> <li><code>migrations/001_create_users.py</code> - Migration script</li> </ul> <h4 id=validation_2>Validation<a class=headerlink href=#validation_2 title="Permanent link">¶</a></h4> <div class="language-bash highlight"><pre><span></span><code><span id=__span-5-1><a id=__codelineno-5-1 name=__codelineno-5-1 href=#__codelineno-5-1></a>python<span class=w> </span>-m<span class=w> </span>migrations<span class=w> </span>upgrade
</span></code></pre></div> <h2 id=phase-2-authentication>Phase 2: Authentication<a class=headerlink href=#phase-2-authentication title="Permanent link">¶</a></h2> <p>Implement login and session management.</p> <h3 id=step-1-create-auth-service>Step 1: Create auth service<a class=headerlink href=#step-1-create-auth-service title="Permanent link">¶</a></h3> <p>... ```</p> <h2 id=see-also>See Also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li><a href=../../commands/plan/ >plan</a> - Generate a plan</li> <li><a href=../../commands/implement/ >implement</a> - Execute a plan</li> </ul> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../exit-codes/ class="md-footer__link md-footer__link--prev" aria-label="Previous: Exit Codes"> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11z"/></svg> </div> <div class=md-footer__title> <span class=md-footer__direction> Previous </span> <div class=md-ellipsis> Exit Codes </div> </div> </a> <a href=../../troubleshooting/ class="md-footer__link md-footer__link--next" aria-label="Next: Troubleshooting"> <div class=md-footer__title> <span class=md-footer__direction> Next </span> <div class=md-ellipsis> Troubleshooting </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11z"/></svg> </div> </a> </nav> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2026 Alex Metelli </div> Made with <a href=https://squidfunk.github.io/mkdocs-material/ target=_blank rel=noopener> Material for MkDocs </a> </div> <div class=md-social> <a href=https://github.com/ametel01/weld-cli target=_blank rel=noopener title=github.com class=md-social__link> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 512 512"><!-- Font Awesome Free 7.1.0 by @fontawesome - 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