diff --git a/src/hooks/auto-slash-command/init-deep-skill.test.ts b/src/hooks/auto-slash-command/init-deep-skill.test.ts
new file mode 100644
index 000000000..2730255c8
--- /dev/null
+++ b/src/hooks/auto-slash-command/init-deep-skill.test.ts
@@ -0,0 +1,43 @@
+/// <reference path="../../../bun-test.d.ts" />
+
+import { describe, expect, test } from "bun:test"
+import { createBuiltinSkills } from "../../features/builtin-skills"
+import type { LoadedSkill } from "../../features/opencode-skill-loader"
+import { executeSlashCommand } from "./executor"
+
+function asLoadedSkill(name: string): LoadedSkill {
+	const skill = createBuiltinSkills().find((candidate) => candidate.name === name)
+	if (!skill) {
+		throw new Error(`missing builtin skill: ${name}`)
+	}
+
+	return {
+		name: skill.name,
+		definition: {
+			name: skill.name,
+			description: skill.description,
+			template: skill.template,
+			argumentHint: skill.argumentHint,
+		},
+		scope: "builtin",
+	}
+}
+
+describe("init-deep slash surface", () => {
+	test("#given init-deep builtin skill #when slash command executes #then it renders skill instructions with arguments", async () => {
+		// given
+		const skills = [asLoadedSkill("init-deep")]
+
+		// when
+		const result = await executeSlashCommand(
+			{ command: "init-deep", args: "--max-depth=2", raw: "/init-deep --max-depth=2" },
+			{ skills, pluginsEnabled: false },
+		)
+
+		// then
+		expect(result.success).toBe(true)
+		expect(result.replacementText).toContain("**Scope**: skill")
+		expect(result.replacementText).toContain("--max-depth=2")
+		expect(result.replacementText).toContain("Generate hierarchical AGENTS.md files")
+	})
+})
diff --git a/src/hooks/start-work/start-work-hook.test.ts b/src/hooks/start-work/start-work-hook.test.ts
new file mode 100644
index 000000000..007823dd3
--- /dev/null
+++ b/src/hooks/start-work/start-work-hook.test.ts
@@ -0,0 +1,58 @@
+/// <reference types="bun-types" />
+
+import { describe, expect, test, beforeEach, afterEach } from "bun:test"
+import { existsSync, mkdirSync, rmSync, writeFileSync } from "node:fs"
+import { join } from "node:path"
+import { tmpdir } from "node:os"
+import { randomUUID } from "node:crypto"
+import { readBoulderState, clearBoulderState } from "../../features/boulder-state"
+import { unsafeTestValue } from "../../../test-support/unsafe-test-value"
+import { createStartWorkHook } from "./start-work-hook"
+
+describe("start-work hook platform session ids", () => {
+  let testDir: string
+
+  function createStartWorkPrompt(): string {
+    return `<command-instruction>
+You are starting a Sisyphus work session.
+</command-instruction>
+
+<session-context></session-context>`
+  }
+
+  beforeEach(() => {
+    testDir = join(tmpdir(), `start-work-hook-session-prefix-${randomUUID()}`)
+    mkdirSync(join(testDir, ".omo", "plans"), { recursive: true })
+    clearBoulderState(testDir)
+  })
+
+  afterEach(() => {
+    clearBoulderState(testDir)
+    if (existsSync(testDir)) {
+      rmSync(testDir, { recursive: true, force: true })
+    }
+  })
+
+  test("#given raw chat session id #when processing start-work template #then boulder stores opencode-prefixed id", async () => {
+    // given
+    writeFileSync(join(testDir, ".omo", "plans", "work.md"), "# Work\n- [ ] First task\n")
+    const hook = createStartWorkHook(unsafeTestValue<Parameters<typeof createStartWorkHook>[0]>({
+      directory: testDir,
+      client: {
+        session: {
+          messages: async () => ({ data: [] }),
+        },
+      },
+    }))
+    const output = {
+      parts: [{ type: "text", text: createStartWorkPrompt() }],
+    }
+
+    // when
+    await hook["chat.message"]({ sessionID: "raw-sess" }, output)
+    const state = readBoulderState(testDir)
+
+    // then
+    expect(state?.session_ids).toEqual(["opencode:raw-sess"])
+  })
+})