Stitch SDK README Generator

This skill produces the README for @google/stitch-sdk. It combines a structural strategy (the Bookstore Test) with instructions for sourcing the current API from the codebase — so the README stays accurate as the SDK evolves.

How to Source the Current API

Do not hard-code the API surface. Read it from the codebase at invocation time:

What you need	Where to find it
Public exports (full surface)	`packages/sdk/src/index.ts`
Domain class methods + signatures	Source files for each exported class (`sdk.ts`, `project.ts`, `screen.ts`)
Generated method bindings	`packages/sdk/generated/domain-map.json` → `bindings[]` array
Handwritten methods	Methods in class source files that aren't in domain-map bindings (e.g. `Screen.edit`, `Screen.variants`)
AI SDK tools adapter	`packages/sdk/src/ai.ts` → subpath entry for `stitchTools()`
Generated tool definitions	`packages/sdk/generated/src/tool-definitions.ts` → JSON Schema for each tool
Tool client methods	`packages/sdk/src/client.ts`
Error codes	`packages/sdk/src/spec/errors.ts` → `StitchErrorCode`
Config options	`packages/sdk/src/spec/client.ts` → `StitchConfigSchema`
Proxy config	`packages/sdk/src/proxy/core.ts`

After reading these files, you have the complete API surface. Structure it using the Bookstore Test template below.

The Bookstore Test

A reader decides whether to use a library the same way a person decides to buy a book: they glance at the cover, read the inner flap, then commit to reading the book. The README must earn the reader's attention at each stage.

The Cover

A single sentence stating what problem this library solves — not what the library is. The reader should recognize their own situation. No taglines, no badges, no logos.

For this SDK, the cover is about generating UI from text and extracting HTML/screenshots programmatically.

Good: "Generate UI screens from text prompts and extract their HTML and screenshots programmatically." Bad: "The official TypeScript SDK for Google Stitch, a powerful AI-powered UI generation platform."

The Inner Flap

Immediately show the library in use. Code first, not setup.

Primary workflow — the punchline everything in the SDK exists to produce:

project(id) → generate → getHtml

Show this as the first code block, with one line noting the env var requirement. Do not show installation, imports, or config before this. Show callTool("create_project", ...) separately for project creation.

Secondary workflows — reveal depth progressively:

Listing and iterating over existing projects/screens
Editing a screen and generating variants
Tool access via singleton (stitch.listTools(), stitch.callTool()) — zero setup
Explicit configuration via StitchToolClient (custom API key, base URL)
AI SDK integration via stitchTools() — import from @google/stitch-sdk/ai, show generateText with tools: stitchTools() and stepCountIs

Rules for this section:

No setup first. One line mentioning STITCH_API_KEY is enough before the first example.
Dual install paths. Show npm install @google/stitch-sdk first (core SDK, standalone). Then show npm install @google/stitch-sdk ai for AI SDK users. The ai package is only needed when importing from @google/stitch-sdk/ai.
Straightforward language. No "powerful", "seamless", "robust", "enterprise-grade".
Working examples. Every code block must be valid, runnable code — not fragments with // ... elisions.
Progressive complexity. Simplest invocation first, then deeper capabilities.

Reading the Book

The reader is committed. Document the full API as a reference.

Structure by class in this order: Stitch → Project → DesignSystem → Screen → StitchToolClient → toolDefinitions / toolMap → stitchTools() (AI SDK) → StitchProxy → stitch singleton.

Each entry should have:

What it does (one line)
Usage example (minimal, runnable)
Parameters (table)
Return type and error behavior

Setup, authentication, and configuration go here — after the reader has already decided the library is worth using.

Tone

Write like a colleague explaining their work to another engineer. Be direct. Be specific. Don't sell — inform. If a feature has limitations, state them. If setup is complex, say so.

Validation

After generating the README, verify:

Can a reader understand what the library does in under 10 seconds?
Is there a runnable code example within the first scroll?
Does setup/config appear after the first code example?
Is every code block valid, copy-pasteable code?
Is the language descriptive rather than promotional?
Does the reference section cover every public export from index.ts?
Every method name in examples exists in its class source file
Every import in examples matches an export in index.ts
All three modalities are documented: domain classes (scripts), StitchToolClient (agents), stitchTools() (AI SDK)

Anti-patterns

Anti-pattern	Why it fails
Leading with badges, logos, or status shields	Visual noise before the reader knows what the library does
"Getting Started" as the first section	Forces setup before demonstrating value
Feature bullet lists without code	Tells instead of shows
"Easy to use", "simple", "just works"	Self-congratulatory claims that invite skepticism
Long install/config blocks before any usage	Asks for investment before demonstrating return
Collapsible sections hiding core API docs	Buries the content committed readers came for
Hard-coding the API in docs without sourcing	Goes stale when tools are added

stitch-sdk-readme