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+/**
+ * Deep research — the /deep-research slash command. An explicit entry point
+ * (alongside the auto-triggering deep-research skill) that kicks off a research
+ * run for a given question.
+ *
+ * The command is thin: it validates a non-empty question and injects a user
+ * message that starts the deep-research flow. The actual orchestration
+ * (decompose → fan out web-search-researcher subagents → synthesize a cited
+ * report) lives in skills/deep-research/SKILL.md, which the injected prompt
+ * triggers. pi.sendUserMessage always starts a turn.
+ */
+
+import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";
+
+// ── Shared core: build the prompt that starts a deep-research run ───────────
+
+export function buildDeepResearchPrompt(question: string): string {
+  return (
+    `Do deep research on the following question and produce a cited Markdown report. ` +
+    `Use the deep-research skill: decompose it into sub-questions, fan out web-search-researcher ` +
+    `subagents to research each against the live web, then synthesize a source-cited report file.\n\n` +
+    `Question: ${question}`
+  );
+}
+
+// ── Public: register the /deep-research slash command ──────────────────────
+
+export function registerDeepResearchCommand(pi: ExtensionAPI): void {
+  pi.registerCommand("deep-research", {
+    description: "Research a question on the web and write a cited report",
+    handler: async (args, ctx) => {
+      const question = args.trim();
+      if (question.length === 0) {
+        ctx.ui.notify('Usage: /deep-research <question>. Example: /deep-research "compare CDP vs WebDriver"', "warning");
+        return;
+      }
+      ctx.ui.notify(`Starting deep research: ${question}`, "info");
+      pi.sendUserMessage(buildDeepResearchPrompt(question));
+    },
+  });
+}