From a96ed80cd5c3bac5ab8b7e26bf991711ce4c6e2a Mon Sep 17 00:00:00 2001
From: Alex Southwell <4596216+saphid@users.noreply.github.com>
Date: Tue, 3 Nov 2026 11:26:14 +1100
Subject: [PATCH 1/2] fix(pi): extension errors name folder extensions instead
 of "index"

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 packages/provider-pi/src/server/adapter.test.ts | 9 ++++++++-
 packages/provider-pi/src/server/adapter.ts      | 6 ++++--
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/packages/provider-pi/src/server/adapter.test.ts b/packages/provider-pi/src/server/adapter.test.ts
index 5c94de304020..e30a3ea4ba78 100644
--- a/packages/provider-pi/src/server/adapter.test.ts
+++ b/packages/provider-pi/src/server/adapter.test.ts
@@ -1548,7 +1548,11 @@ describe("PiAdapterV2", () => {
           method: "notify",
           message: "note",
         });
-        yield* fake.emit({ type: "extension_error", extensionPath: "/ext/a.ts", error: "boom" });
+        yield* fake.emit({
+          type: "extension_error",
+          extensionPath: "/ext/a/index.ts",
+          error: "boom",
+        });
         for (const prefix of ["notify:", "extension-error:"]) {
           const item = yield* takeEvent(
             (event) =>
@@ -1556,6 +1560,9 @@ describe("PiAdapterV2", () => {
               event.turnItem.nativeItemRef?.nativeId?.startsWith(prefix) === true,
           );
           if (item.type === "turn_item.updated") itemIds.add(item.turnItem.id);
+          if (item.type === "turn_item.updated" && prefix === "extension-error:") {
+            assert.equal(item.turnItem.title, "a");
+          }
         }
       }
       assert.equal(itemIds.size, 4);
diff --git a/packages/provider-pi/src/server/adapter.ts b/packages/provider-pi/src/server/adapter.ts
index a32a5759ba70..d67a947c2fee 100644
--- a/packages/provider-pi/src/server/adapter.ts
+++ b/packages/provider-pi/src/server/adapter.ts
@@ -3298,8 +3298,10 @@ function piSubagentOutput(result: unknown): string {
 
 function piExtensionDisplayName(extensionPath: string | undefined): string {
   if (extensionPath === undefined) return "Pi extension";
-  const normalized = extensionPath.replace(/\\/g, "/").replace(/\/+$/, "");
-  const name = normalized.slice(normalized.lastIndexOf("/") + 1).replace(/\.[^.]+$/, "");
+  const segments = extensionPath.replace(/\\/g, "/").split("/").filter(Boolean);
+  const fileName = segments.at(-1)?.replace(/\.[^.]+$/, "") ?? "";
+  // Pi loads a directory extension from its index file; the folder names it.
+  const name = fileName === "index" ? (segments.at(-2) ?? fileName) : fileName;
   return name.length === 0 ? "Pi extension" : name;
 }
 

From d823fa4c4d714662828140d8414a6f6d1830d6f7 Mon Sep 17 00:00:00 2001
From: Alex Southwell <4596216+saphid@users.noreply.github.com>
Date: Tue, 3 Nov 2026 12:42:33 +1100
Subject: [PATCH 2/2] test(pi): cover single-file extension names alongside
 folder index

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 packages/provider-pi/src/server/adapter.test.ts | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/packages/provider-pi/src/server/adapter.test.ts b/packages/provider-pi/src/server/adapter.test.ts
index e30a3ea4ba78..67c2c8f4fc86 100644
--- a/packages/provider-pi/src/server/adapter.test.ts
+++ b/packages/provider-pi/src/server/adapter.test.ts
@@ -1523,7 +1523,10 @@ describe("PiAdapterV2", () => {
   it.effect("gives notify and extension-error items distinct ids in each thread", () =>
     Effect.gen(function* () {
       const itemIds = new Set<string>();
-      for (const threadId of [THREAD_ID, ThreadId.make("thread-pi-test-2")]) {
+      for (const [threadId, extensionPath] of [
+        [THREAD_ID, "/ext/a.ts"],
+        [ThreadId.make("thread-pi-test-2"), "/ext/a/index.ts"],
+      ] as const) {
         const fake = yield* makeFakePi;
         const { runtime, takeEvent } = yield* openRuntime(fake, "default", threadId);
         const providerThread = yield* runtime.ensureThread({
@@ -1548,11 +1551,7 @@ describe("PiAdapterV2", () => {
           method: "notify",
           message: "note",
         });
-        yield* fake.emit({
-          type: "extension_error",
-          extensionPath: "/ext/a/index.ts",
-          error: "boom",
-        });
+        yield* fake.emit({ type: "extension_error", extensionPath, error: "boom" });
         for (const prefix of ["notify:", "extension-error:"]) {
           const item = yield* takeEvent(
             (event) =>