Add file-trigger hook example

.opencode/tool/sleep.ts

@@ -0,0 +1,22 @@
+import { tool } from "@opencode-ai/plugin"
+
+export default tool({
+  description: "Sleep for a specified number of milliseconds",
+  args: {
+    ms: tool.schema.number().describe("Number of milliseconds to sleep"),
+  },
+  async execute(args, context) {
+    if (context.abort.aborted) {
+      throw new Error("Sleep aborted")
+    }
+    await new Promise<void>((resolve, reject) => {
+      const timeout = setTimeout(resolve, args.ms)
+      const onAbort = () => {
+        clearTimeout(timeout)
+        reject(new Error("Sleep aborted"))
+      }
+      context.abort.addEventListener("abort", onAbort, { once: true })
+    })
+    return `Slept for ${args.ms}ms`
+  },
+})