source-driven-development

# Source-Driven Development

## Overview

Every framework-specific code decision must be backed by official documentation. Don't implement from memory — verify, cite, and let the user see your sources. Training data goes stale, APIs get deprecated, best practices evolve. This skill ensures the user gets code they can trust because every pattern traces back to an authoritative source they can check.

## When to Use

- The user wants code that follows current best practices for a given framework
- Building boilerplate, starter code, or patterns that will be copied across a project
- The user explicitly asks for documented, verified, or "correct" implementation
- Implementing features where the framework's recommended approach matters (forms, routing, data fetching, state management, auth)
- Reviewing or improving code that uses framework-specific patterns
- Any time you are about to write framework-specific code from memory

**When NOT to use:**

- Correctness does not depend on a specific version (renaming variables, fixing typos, moving files)
- Pure logic that works the same across all versions (loops, conditionals, data structures)
- The user explicitly wants speed over verification ("just do it quickly")

## The Process

```
DETECT ──→ FETCH ──→ IMPLEMENT ──→ CITE
  │          │           │            │
  ▼          ▼           ▼            ▼
 What       Get the    Follow the   Show your
 stack?     relevant   documented   sources
            docs       patterns
```

### Step 1: Detect Stack and Versions

Read the project's dependency file to identify exact versions:

```
package.json    → Node/React/Vue/Angular/Svelte
composer.json   → PHP/Symfony/Laravel
requirements.txt / pyproject.toml → Python/Django/Flask
go.mod          → Go
Cargo.toml      → Rust
Gemfile         → Ruby/Rails
```

State what you found explicitly:

```
STACK DETECTED:
- React 19.1.0 (from package.json)
- Vite 6.2.0
- Tailwind CSS 4.0.3
→ Fetching official docs for the relevant patterns.
```

If versions are missing or ambiguous, **ask the user**. Don't guess — the version determines which patterns are correct.

### Step 2: Fetch Official Documentation

Fetch the specific documentation page for the feature you're implementing. Not the homepage, not the full docs — the relevant page.

**Source hierarchy (in order of authority):**

| Priority | Source | Example |
|----------|--------|---------|
| 1 | Official documentation | react.dev, docs.djangoproject.com, symfony.com/doc |
| 2 | Official blog / changelog | react.dev/blog, nextjs.org/blog |
| 3 | Web standards references | MDN, web.dev, html.spec.whatwg.org |
| 4 | Browser/runtime compatibility | caniuse.com, node.green |

**Not authoritative — never cite as primary sources:**

- Stack Overflow answers
- Blog posts or tutorials (even popular ones)
- AI-generated documentation or summaries
- Your own training data (that is the whole point — verify it)

**Be precise with what you fetch:**

```
BAD:  Fetch the React homepage
GOOD: Fetch react.dev/reference/react/useActionState

BAD:  Search "django authentication best practices"
GOOD: Fetch docs.djangoproject.com/en/6.0/topics/auth/
```

After fetching, extract the key patterns and note any deprecation warnings or migration guidance.

When official sources conflict with each other (e.g. a migration guide contradicts the API reference), surface the discrepancy to the user and verify which pattern actually works against the detected version.

### Step 3: Implement Following Documented Patterns

Write code that matches what the documentation shows:

- Use the API signatures from the docs, not from memory
- If the docs show a new way to do something, use the new way
- If the docs deprecate a pattern, don't use the deprecated version
- If the docs don't cover something, flag it as unverified

**When docs conflict with existing project code:**

```
CONFLICT DETECTED:
The existing codebase uses useState for form loading state,
but React 19 docs recommend useActionState for this pattern.
(Source: react.dev/reference/react/useActionState)

Options:
A) Use the modern pattern (useActionState) — consistent with current docs
B) Match existing code (useState) — consistent with codebase
→ Which approach do you prefer?
```

Surface the conflict. Don't silently pick one.

### Step 4: Cite Your Sources

Every framework-specific pattern gets a citation. The user must be able to verify every decision.

**In code comments:**

```typescript
// React 19 form handling with useActionState
// Source: https://react.dev/reference/react/useActionState#usage
const [state, formAction, isPending] = useActionState(submitOrder, initialState);
```

**In conversation:**

```
I'm using useActionState instead of manual useState for the
form submission state. React 19 replaced the manual
isPending/setIsPending pattern with this hook.

Source: https://react.dev/blog/2024/12/05/react-19#actions
"useTransition now supports async functions [...] to handle
pending states automatically"
```

**Citation rules:**

- Full URLs, not shortened
- Prefer deep links with anchors where possible (e.g. `/useActionState#usage` over `/useActionState`) — anchors survive doc restructuring better than top-level pages
- Quote the relevant passage when it supports a non-obvious decision
- Include browser/runtime support data when recommending platform features
- If you cannot find documentation for a pattern, say so explicitly:

```
UNVERIFIED: I could not find official documentation for this
pattern. This is based on training data and may be outdated.
Verify before using in production.
```

Honesty about what you couldn't verify is more valuable than false confidence.

## Common Rationalizations

| Rationalization | Reality |
|---|---|
| "I'm confident about this API" | Confidence is not evidence. Training data contains outdated patterns that look correct but break against current versions. Verify. |
| "Fetching docs wastes tokens" | Hallucinating an API wastes more. The use