docs(ai-chat): clarify local setup with .env.example (#3623)

Author: ericallam

references/ai-chat/.env.example

@@ -0,0 +1,31 @@
+# Local dev (Trigger.dev webapp running on http://localhost:3030)
+#
+# Create a project in the local dashboard (References org) and copy:
+#   - TRIGGER_PROJECT_REF from the project URL (proj_...)
+#   - TRIGGER_SECRET_KEY from the project's Dev environment API keys
+#   - NEXT_PUBLIC_TRIGGER_PROJECT_DASHBOARD_PATH from the dashboard URL
+TRIGGER_API_URL="http://localhost:3030"
+NEXT_PUBLIC_TRIGGER_API_URL="http://localhost:3030"
+NEXT_PUBLIC_TRIGGER_DASHBOARD_URL="http://localhost:3030"
+NEXT_PUBLIC_TRIGGER_PROJECT_DASHBOARD_PATH="/orgs/<org-slug>/projects/<project-slug>"
+TRIGGER_SECRET_KEY="tr_dev_..."
+TRIGGER_PROJECT_REF="proj_..."
+
+# Postgres database for the ai-chat reference app itself (separate from the
+# webapp's database). Schema is applied by `npx prisma migrate deploy`.
+DATABASE_URL="postgresql://postgres:postgres@localhost:5432/ai_chat?schema=public"
+
+# Model providers — needed by the chat task. At least one is required.
+OPENAI_API_KEY=""
+ANTHROPIC_API_KEY=""
+
+# Optional — code-sandbox tool
+E2B_API_KEY=""
+
+# Optional — analytics
+POSTHOG_API_KEY=""
+POSTHOG_PROJECT_ID=""
+
+# Optional — tuning knobs
+COMPACT_AFTER_TOKENS="50000"
+WEBFETCH_LATENCY_MS="0"

references/ai-chat/README.md

@@ -41,22 +41,38 @@ Persistence is handled server-side in the Trigger.dev task via three hooks:
 
 ## Setup
 
+This reference assumes you already have the local webapp running per the repo's [`CONTRIBUTING.md`](../../CONTRIBUTING.md) (Docker services, `pnpm run db:migrate`, `pnpm run db:seed`, webapp on `:3030`).
+
+Unlike `hello-world`, the ai-chat project is **not** in the webapp seed. You'll need to create it manually:
+
+1. Open http://localhost:3030, log in, switch to the `References` org, and create a new project called `ai-chat`.
+2. Grab the project ref (`proj_...`) from the URL and a Dev secret key from the project's API keys page.
+3. Set up this app's env and database:
+
+   ```bash
+   cd references/ai-chat
+   cp .env.example .env
+   # Fill in TRIGGER_PROJECT_REF, TRIGGER_SECRET_KEY,
+   # NEXT_PUBLIC_TRIGGER_PROJECT_DASHBOARD_PATH, and at least one
+   # of OPENAI_API_KEY / ANTHROPIC_API_KEY.
+   npx prisma migrate deploy
+   ```
+
+   The `DATABASE_URL` in `.env.example` points at the local Postgres started by `pnpm run docker` and uses a separate `ai_chat` database.
+
+## Running
+
+Three terminals from the repo root:
+
 ```bash
-# From the repo root
-pnpm run docker              # Start PostgreSQL, Redis, Electric
-pnpm run db:migrate          # Run webapp migrations
-pnpm run db:seed             # Seed the database
-
-# Set up the reference app's database
-cd references/ai-chat
-cp .env.example .env         # Edit DATABASE_URL if needed
-npx prisma migrate deploy
-
-# Build and run
-pnpm run build --filter trigger.dev --filter @trigger.dev/sdk
-pnpm run dev --filter webapp  # In one terminal
-cd references/ai-chat && pnpm exec trigger dev  # In another
-cd references/ai-chat && pnpm run dev            # In another
+# 1. Webapp (if not already running)
+pnpm run dev --filter webapp
+
+# 2. Trigger CLI dev (registers the chat tasks with the local webapp)
+cd references/ai-chat && pnpm exec trigger dev
+
+# 3. Next.js dev server for the chat UI
+cd references/ai-chat && pnpm run dev
 ```
 
 Open http://localhost:3000 to use the chat app.