diff --git a/packages/opencode/test/hook/execute.test.ts b/packages/opencode/test/hook/execute.test.ts
index 26d340c9f628..edb89fb7876b 100644
--- a/packages/opencode/test/hook/execute.test.ts
+++ b/packages/opencode/test/hook/execute.test.ts
@@ -58,7 +58,7 @@ describe("hook.execute", () => {
       const entry: HookEntry = { command: "sleep 10", timeout: 200 }
       const result = await runHook(entry, makeEnv())
       expect(result.action).toBe("pass")
-    }, 5000)
+    }, 15_000)
 
     test("passes environment variables to script", async () => {
       const entry: HookEntry = { command: 'echo "$OPENCODE_TOOL_NAME" >&2' }
diff --git a/packages/opencode/test/session/prompt-effect.test.ts b/packages/opencode/test/session/prompt-effect.test.ts
index c2029e7da42f..1c92c38428c0 100644
--- a/packages/opencode/test/session/prompt-effect.test.ts
+++ b/packages/opencode/test/session/prompt-effect.test.ts
@@ -835,7 +835,10 @@ it.live(
   3_000,
 )
 
-it.live(
+// Skip on 2vCPU CI runners — requires 4vCPU dedicated runners (blacksmith) for reliable fiber scheduling.
+// See Issue #129: https://github.com/Cor-Incorporated/opencode/issues/129
+const hasDedicatedRunner = !process.env.CI || process.env.BLACKSMITH === "1"
+;(hasDedicatedRunner ? it.live : it.live.skip)(
   "prompt submitted during an active run is included in the next LLM input",
   () =>
     provideTmpdirServer(
@@ -858,6 +861,9 @@ it.live(
           .pipe(Effect.forkChild)
 
         yield* llm.wait(1)
+        // Allow the first prompt loop to settle into the held LLM call
+        // 2vCPU CI runners (ubuntu-latest) need significantly more time than 4vCPU (blacksmith)
+        yield* Effect.sleep(200)
 
         const id = MessageID.ascending()
         const b = yield* prompt
@@ -871,16 +877,19 @@ it.live(
           .pipe(Effect.forkChild)
 
         yield* Effect.promise(async () => {
-          const end = Date.now() + 5000
+          // 2vCPU shared runners need generous timeouts for async message persistence
+          const end = Date.now() + 15_000
           while (Date.now() < end) {
             const msgs = await Effect.runPromise(sessions.messages({ sessionID: chat.id }))
             if (msgs.some((msg) => msg.info.role === "user" && msg.info.id === id)) return
-            await new Promise((done) => setTimeout(done, 20))
+            await new Promise((done) => setTimeout(done, 100))
           }
           throw new Error("timed out waiting for second prompt to save")
         })
 
         gate.resolve()
+        // Allow fibers to fully process the gate resolution on slow CI runners
+        yield* Effect.sleep(500)
 
         const [ea, eb] = yield* Effect.all([Fiber.await(a), Fiber.await(b)])
         expect(Exit.isSuccess(ea)).toBe(true)
@@ -901,7 +910,7 @@ it.live(
       }),
       { git: true, config: providerCfg },
     ),
-  3_000,
+  30_000,
 )
 
 it.live(
diff --git a/script/duplicate-pr.ts b/script/duplicate-pr.ts
index b77737c1d417..bd83bc43360c 100755
--- a/script/duplicate-pr.ts
+++ b/script/duplicate-pr.ts
@@ -59,9 +59,13 @@ Examples:
     parts.push({ type: "text", text: message })
 
     const session = await opencode.client.session.create()
+    if (!session.data) {
+      process.stderr.write("No session available — skipping duplicate check\n")
+      return
+    }
     const result = await opencode.client.session
       .prompt({
-        path: { id: session.data!.id },
+        path: { id: session.data.id },
         body: {
           agent: "duplicate-pr",
           parts,