/emulate-seed

name: emulate-seed
compatibility: "Claude Code 2.1.251+"
description: "Generate emulate seed configs for stateful API emulation. Wraps Vercel's emulate tool for GitHub, Vercel, Google OAuth, Slack, Apple Auth, Microsoft Entra, AWS, Okta, Clerk, Resend, Stripe, and MongoDB Atlas APIs — full state machines, not mocks. Use when setting up test environments, CI pipelines, integration tests, or offline development."
tags: [emulate, testing, api-emulation, github, vercel, google, stripe, resend, okta, clerk, mongodb, seed, ci, stateful-testing]
version: 1.3.0
author: OrchestKit
user-invocable: false
disable-model-invocation: false
complexity: medium
context: inherit
persuasion-type: guidance
agent: emulate-engineer
metadata:
  category: testing
  upstream-package: emulate
  upstream-version-tested: "0.10.0"

Emulate Seed Configs

Generate and manage seed configs for [emulate](https://github.com/vercel-labs/emulate) (Apache-2.0) — Vercel Labs' stateful API emulation tool. Each category has individual rule files in `rules/` loaded on-demand.

> **Paired agent:** This skill pairs with the [`emulate-engineer`](../../agents/emulate-engineer.md) subagent (`subagent_type: "ork:emulate-engineer"`). When a task involves generating a full emulate config from scratch, webhook HMAC setup, CI pipeline integration, or parallel-worker port isolation, spawn the agent rather than handling it inline — it has the full 13-emulator service-port matrix and seed-rules in context.

**Not mocks.** Emulate provides full state machines with cascading deletes, cursor pagination, webhook delivery, and HMAC signature verification. Create a PR via the API and it appears in `GET /repos/:owner/:repo/pulls`. Delete a repo and its issues, PRs, and webhooks cascade-delete.

New in 2026-04 (emulate 0.4.x)

• **Modular `@emulators/*` packages** — each service is its own package (`@emulators/github`, `@emulators/stripe`, etc.); top-level `emulate` re-exports `createEmulator` and the CLI.
• **4 new services** (12 total): `mongoatlas:4007`, `okta:4008`, `resend:4009`, `stripe:4010` with drop-in seed YAML blocks.
• **Resend local inbox** — `GET http://localhost:4009/inbox` returns captured emails for assertions without hitting a real provider.
• **Stripe hosted checkout** — real session redirect flow + `checkout.session.completed`/`expired` webhook delivery, suitable for E2E payment tests.
• **MongoDB Atlas** — Admin API v2 (projects/clusters/DB users) + Data API v1 with full CRUD + aggregate.
• **Okta OIDC** — full discovery, JWKS, `authorize/token/userinfo/revoke/introspect` plus Users/Groups/Apps CRUD.
• **Entra / Apple / Slack expansions (v0.4.0)** — PKCE + refresh rotation (Entra), RS256 JWKS (Apple), OAuth v2 consent UI (Slack).
• **`@emulators/adapter-next`** — catch-all Next.js route handler runs emulators on the same origin as the app; fixes OAuth callback URL drift on Vercel preview deploys.

Auto-Discovery (M125 #4)

`scripts/auto-discover.sh` scans the project's `package.json`, matches deps against `references/dep-to-emulator-map.json`, and either reports the matches or writes `emulate.config.yaml`. Three modes:

| Mode | Behavior | |---|---| | (default) | Report matched deps + emulator union on stderr; do not write | | `--json` | Emit machine-readable JSON instead of human report | | `--apply` | Write `emulate.config.yaml` (refuses to overwrite without `--force`) |

$ bash scripts/auto-discover.sh
emulate-seed --auto — scanning /path/to/package.json

Detected:
  @octokit/rest  →  github · Any GitHub API client
  next-auth  →  google-oauth, apple-auth, microsoft-entra · Default OAuth providers
  stripe  →  stripe
  @vercel/blob  →  aws · @vercel/blob is S3-compatible

Union: apple-auth, aws, github, google-oauth, microsoft-entra, stripe

$ bash scripts/auto-discover.sh --apply
…
✓ Wrote /path/to/emulate.config.yaml with 6 service(s)

Multi-emulator deps default to all reasonable providers; the user prunes the YAML afterwards. Unmapped deps are silently skipped — extending coverage is a docs PR (edit `references/dep-to-emulator-map.json`), not a code change.

`dev` reads the resulting `emulate.config.yaml` at boot — see `src/skills/dev/scripts/boot.sh`.

Quick Reference

| Category | Rules | Impact | When to Use | |----------|-------|--------|-------------| | [Seed Config](#seed-config) | 1 | HIGH | Setting up emulate.config.yaml for test environments | | [Service Selection](#service-selection) | 1 | MEDIUM | Choosing GitHub/Vercel/Google for your tests | | [Webhook Setup](#webhook-setup) | 1 | MEDIUM | Testing webhook delivery with HMAC verification | | [Parallel CI](#parallel-ci) | 1 | HIGH | Running tests in parallel without port collisions | | [Auth Tokens](#auth-tokens) | 1 | MEDIUM | Seeding tokens mapped to emulated users |

**Total: 5 rules across 5 categories**

Quick Start

# Install (packages published under @emulators/* scope)
npm install --save-dev emulate

# Start all services
npx emulate

# Start specific services with seed data
npx emulate --service github,stripe --seed ./emulate.config.yaml

# Generate a starter config
npx emulate init --service github

Services (0.10.0 — 14 emulators)

> **New across releases:** > - **0.5.0** — added Clerk, MongoDB Atlas, Stripe, Resend, and Okta emulators; portless integration (embedded emulators without dedicated ports); Google OAuth `hd` claim support; Stripe Checkout + Resend magic link examples; AWS S3 emulator now matches the official SDK wire format. > - **0.6.0** — expanded Slack (OAuth v2 consent UI, conversations/reactions). > - **0.6.1** — Vercel Blob store. > - **0.7.0** — added Linear (13th provider): stateful orgs/teams/issues/cycles + webhooks. > - **0.8.0** — added Twilio (14th provider): accounts, phone numbers, messages, calls, conversations, messaging services, Verify flows, and simulator endpoints, with a Next.js SMS-verification example. > - **0.9.0** — added a Nuxt emulator adapter (alongside the Next.j