Add trigger-dev-tasks skill for writing Trigger.dev tasks

Author: ericallam

.claude/skills/trigger-dev-tasks/SKILL.md

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+---
+name: trigger-dev-tasks
+description: Use this skill when writing, designing, or optimizing Trigger.dev background tasks and workflows. This includes creating reliable async tasks, implementing AI workflows, setting up scheduled jobs, structuring complex task hierarchies with subtasks, configuring build extensions for tools like ffmpeg or Puppeteer/Playwright, and handling task schemas with Zod validation.
+allowed-tools: Read, Write, Edit, Glob, Grep, Bash
+---
+
+# Trigger.dev Task Expert
+
+You are an expert Trigger.dev developer specializing in building production-grade background job systems. Tasks deployed to Trigger.dev run in Node.js 21+ and use the `@trigger.dev/sdk` package.
+
+## Critical Rules
+
+1. **Always use `@trigger.dev/sdk`** - Never use `@trigger.dev/sdk/v3` or deprecated `client.defineJob` pattern
+2. **Never use `node-fetch`** - Use the built-in `fetch` function
+3. **Export all tasks** - Every task must be exported, including subtasks
+4. **Never wrap wait/trigger calls in Promise.all** - `triggerAndWait`, `batchTriggerAndWait`, and `wait.*` calls cannot be wrapped in `Promise.all` or `Promise.allSettled`
+
+## Basic Task Pattern
+
+```ts
+import { task } from "@trigger.dev/sdk";
+
+export const processData = task({
+  id: "process-data",
+  retry: {
+    maxAttempts: 10,
+    factor: 1.8,
+    minTimeoutInMs: 500,
+    maxTimeoutInMs: 30_000,
+  },
+  run: async (payload: { userId: string; data: any[] }) => {
+    console.log(`Processing ${payload.data.length} items`);
+    return { processed: payload.data.length };
+  },
+});
+```
+
+## Schema Task (with validation)
+
+```ts
+import { schemaTask } from "@trigger.dev/sdk";
+import { z } from "zod";
+
+export const validatedTask = schemaTask({
+  id: "validated-task",
+  schema: z.object({
+    name: z.string(),
+    email: z.string().email(),
+  }),
+  run: async (payload) => {
+    // Payload is automatically validated and typed
+    return { message: `Hello ${payload.name}` };
+  },
+});
+```
+
+## Triggering Tasks
+
+### From Backend Code (type-only import to prevent dependency leakage)
+
+```ts
+import { tasks } from "@trigger.dev/sdk";
+import type { processData } from "./trigger/tasks";
+
+const handle = await tasks.trigger<typeof processData>("process-data", {
+  userId: "123",
+  data: [{ id: 1 }],
+});
+```
+
+### From Inside Tasks
+
+```ts
+export const parentTask = task({
+  id: "parent-task",
+  run: async (payload) => {
+    // Trigger and wait - returns Result object, NOT direct output
+    const result = await childTask.triggerAndWait({ data: "value" });
+    if (result.ok) {
+      console.log("Output:", result.output);
+    } else {
+      console.error("Failed:", result.error);
+    }
+
+    // Or unwrap directly (throws on error)
+    const output = await childTask.triggerAndWait({ data: "value" }).unwrap();
+  },
+});
+```
+
+## Idempotency (Critical for Retries)
+
+Always use idempotency keys when triggering tasks from inside other tasks:
+
+```ts
+import { idempotencyKeys } from "@trigger.dev/sdk";
+
+export const paymentTask = task({
+  id: "process-payment",
+  run: async (payload: { orderId: string }) => {
+    // Scoped to current run - survives retries
+    const key = await idempotencyKeys.create(`payment-${payload.orderId}`);
+
+    await chargeCustomer.trigger(payload, {
+      idempotencyKey: key,
+      idempotencyKeyTTL: "24h",
+    });
+  },
+});
+```
+
+## Trigger Options
+
+```ts
+await myTask.trigger(payload, {
+  delay: "1h",           // Delay execution
+  ttl: "10m",            // Cancel if not started within TTL
+  idempotencyKey: key,
+  queue: "my-queue",
+  machine: "large-1x",   // micro, small-1x, small-2x, medium-1x, medium-2x, large-1x, large-2x
+  maxAttempts: 3,
+  tags: ["user_123"],    // Max 10 tags
+});
+```
+
+## Machine Presets
+
+| Preset      | vCPU | Memory |
+|-------------|------|--------|
+| micro       | 0.25 | 0.25GB |
+| small-1x    | 0.5  | 0.5GB  |
+| small-2x    | 1    | 1GB    |
+| medium-1x   | 1    | 2GB    |
+| medium-2x   | 2    | 4GB    |
+| large-1x    | 4    | 8GB    |
+| large-2x    | 8    | 16GB   |
+
+## Design Principles
+
+1. **Break complex workflows into subtasks** that can be independently retried and made idempotent
+2. **Don't over-complicate** - Sometimes `Promise.allSettled` inside a single task is better than many subtasks (each task has dedicated process and is charged by millisecond)
+3. **Always configure retries** - Set appropriate `maxAttempts` based on the operation
+4. **Use idempotency keys** - Especially for payment/critical operations
+5. **Group related subtasks** - Keep subtasks only used by one parent in the same file, don't export them
+6. **Use logger** - Log at key execution points with `logger.info()`, `logger.error()`, etc.
+
+## Reference Documentation
+
+For detailed documentation on specific topics, read these files:
+
+- `basic-tasks.md` - Task basics, triggering, waits
+- `advanced-tasks.md` - Tags, queues, concurrency, metadata, error handling
+- `scheduled-tasks.md` - Cron schedules, declarative and imperative
+- `realtime.md` - Real-time subscriptions, streams, React hooks
+- `config.md` - trigger.config.ts, build extensions (Prisma, Playwright, FFmpeg, etc.)