Stitch SDK Pipeline Agent Skill

Stitch SDK Pipeline

This skill orchestrates the full SDK generation pipeline — from capturing MCP tool schemas to publishing a tested, validated package. Use this when:

• The Stitch MCP server adds or changes tools
• You need to regenerate the SDK from scratch
• You want to verify the pipeline is healthy

> [!IMPORTANT]

> Stage 2 is the only step requiring agent intelligence. All other stages are deterministic scripts. For Stage 2, use the stitch-sdk-domain-design skill.

Prerequisites

• STITCH_API_KEY environment variable set
• bun installed
• Working directory: project root (stitch-sdk/)

Pipeline Stages

Stage 1: Capture Tool Schemas 🤖

// turbo
npm run capture

Connects to the Stitch MCP server, calls tools/list, and writes the raw schemas to packages/sdk/generated/tools-manifest.json. Updates the manifest section of stitch-sdk.lock.

Output: packages/sdk/generated/tools-manifest.json (includes inputSchema + outputSchema for every tool)

When to skip: If tools-manifest.json is already up to date and no server-side changes occurred.

Stage 2: Domain Design 🧠 (Agent)

Use the stitch-sdk-domain-design skill for this stage.

Read tools-manifest.json and edit packages/sdk/generated/domain-map.json to map tools → classes → methods.

Key decisions at this stage:

• Which class owns each tool?
• What are the arg routing rules (self, param, computed, selfArray)?
• What is the response projection path?
• Should the method cache data from the construction response?

Input: tools-manifest.json + scripts/ir-schema.ts (the canonical IR contract)

Output: packages/sdk/generated/domain-map.json

When to skip: If domain-map.json already has the correct bindings and you only changed ir-schema.ts or generate-sdk.ts.

Stage 3: Generate TypeScript 🤖

// turbo
npm run generate

Validates the IR (Zod schema) and every projection (against outputSchema), then emits TypeScript files via ts-morph into packages/sdk/generated/src/.

Output: packages/sdk/generated/src/*.ts + updated stitch-sdk.lock

If this fails with a projection error, go back to Stage 2 and fix domain-map.json.

Stage 4: Build 🤖

// turbo
npm run build

TypeScript compilation: packages/sdk/ → packages/sdk/dist/.

Stage 5: Unit Tests 🤖

// turbo
npm run test

Runs core unit tests (vitest) — mocked callTool, verifying generated method signatures, caching, and error handling.

Stage 6: Script Tests 🤖

// turbo
npm run test:scripts

Runs contract tests (IR schema acceptance/rejection) and logic tests (expression builders) using bun:test.

Stage 7: E2E Tests 🤖

npm run test:e2e

Live API tests against the built package. Requires STITCH_API_KEY (and GEMINI_API_KEY for AI SDK tests). Two test suites:

• live.test.ts — Direct SDK calls: create projects, generate screens, verify responses.
• ai-sdk-e2e.test.ts — AI SDK integration via stitchTools(): Gemini autonomously calls Stitch tools, generates designs, extracts HTML + Tailwind config, produces modular React components, validates via SWC, and scaffolds a Vite preview app at .stitch/preview/.

Stage 8: Lock Validation 🤖

// turbo
npm run validate:generated

Verifies that stitch-sdk.lock hashes match the actual generated files. Catches drift (someone edited generated files manually or forgot to regenerate).

> [!IMPORTANT]

> Always run after Stage 3 (Generate). If you run Capture (Stage 1) then Validate without re-generating, the hashes will mismatch because the manifest hash changed.

Stage 9: Skill Audit 🧠 (Agent)

After the pipeline passes, audit agent skills for freshness. Read the current source of truth and update any skills that reference stale methods, args, or examples.

Inputs:

• packages/sdk/src/index.ts (public surface)
• Generated class files in packages/sdk/generated/src/
• packages/sdk/src/spec/errors.ts (error codes)
• packages/sdk/src/spec/client.ts (config schema)

Skills to audit (in priority order):

• stitch-sdk-usage — highest churn, references specific methods and constructor signatures
• stitch-sdk-readme — must document stitchTools(), toolDefinitions, and AI SDK integration examples
• stitch-sdk-development — check cache examples match current domain-map patterns
• stitch-sdk-domain-design — check code examples in the cache section

Skills to skip: stitch-sdk-pipeline (self-referential), red-green-yellow (generic methodology).

What to check:

• Every method name in a code example exists on its class
• Every import in an example matches an export in index.ts
• Constructor signatures match the actual constructors
• Config fields match StitchConfigSchema
• Error codes match StitchErrorCode

When to skip: If only infrastructure code changed (packages/sdk/src/client.ts, packages/sdk/src/proxy/) and no public API surface changed.

Quick Reference

Full pipeline (script stages only)

npm run pipeline

Runs Stage 1 → 3 → 4 → 5 in sequence. Does not include Stage 2 (agent), Stage 7 (e2e), or Stage 9 (skill audit).

Starting from a specific stage

| Scenario | Start from |

| ---------------------------------------------------- | ---------- |

| New tool added to MCP server | Stage 1 |

| Need to change how a tool maps to a method | Stage 2 |

| Changed ir-schema.ts or generate-sdk.ts | Stage 3 |

| Changed code in packages/sdk/src/ (client, errors) | Stage 4 |

| Just want to verify everything works | Stage 5 |

| Changed AI SDK tools adapter or tool definitions | Stage 5 |

| Public API surface changed | Stage 9 |

Key files

| File | Location | Role |

| ------------------------ | ----------------------------- | -------------------------------------------------------------------------- |

| tools-manifest.json | packages/sdk/generated/ | Raw MCP tool schemas (Stage 1 output) |

| domain-map.json | packages/sdk/generated/ | IR: tool → class → method mappings (Stage 2 output) |

| tool-definitions.ts | packages/sdk/generated/src/ | Generated JSON Schema tool definitions for AI SDK |

| tools-adapter.ts | packages/sdk/src/ | stitchTools() — AI SDK v6 adapter (imported via @google/stitch-sdk/ai) |

| ir-schema.ts | scripts/ | Zod schema defining valid IR structure |

| tool-schema.ts | scripts/ | TypeScript types for JSON Schema |

| generate-sdk.ts | scripts/ | ts-morph codegen (Stage 3) |

| stitch-sdk.lock | packages/sdk/generated/ | Integrity hashes for drift detection |

| stitch-html.ts | packages/sdk/test/helpers/ | Stitch HTML parser (Tailwind config + font extraction) |

| component-validator.ts | packages/sdk/test/helpers/ | SWC AST validator for generated React components |