fix(composer): find a thread by its pasted ID in the @ picker

packages/client-runtime/src/composerThreadItems.test.ts

@@ -0,0 +1,40 @@
+import { EnvironmentId, ThreadId } from "@t3tools/contracts";
+import { describe, expect, it } from "vite-plus/test";
+
+import { matchComposerThreadItems } from "./composerThreadItems.ts";
+
+const env = EnvironmentId.make("env-1");
+const shell = (id: string, title: string) => ({
+  environmentId: env,
+  id: ThreadId.make(id),
+  title,
+  updatedAt: "2026-01-01T00:00:00.000Z",
+  archivedAt: null,
+});
+
+describe("matchComposerThreadItems", () => {
+  it("finds a thread by its pasted ID without matching other IDs that share its prefix", () => {
+    const pasted =
+      "thread:project:6f1c2a4e-8b7d-4d3a-9c5e-1a2b3c4d5e6f:0b9d7c1a-3e5f-4a6b-8c2d-7e9f1a3b5c7d";
+    const sibling =
+      "thread:project:6f1c2a4e-8b7d-4d3a-9c5e-1a2b3c4d5e6f:0b9d7c1a-3e5f-4a6b-8c2d-7e9f1a3b5c7e";
+    const items = matchComposerThreadItems({
+      shells: [shell(pasted, "Fix login"), shell(sibling, "Fix logout")],
+      environmentId: env,
+      excludeThreadId: null,
+      query: pasted,
+    });
+    expect(items.map((item) => item.thread.threadId)).toEqual([pasted]);
+  });
+
+  it("does not match an ID that differs from the pasted one only by case", () => {
+    const pasted = "import:opencode:ses_AbC123";
+    const items = matchComposerThreadItems({
+      shells: [shell(pasted, "Imported A"), shell("import:opencode:ses_abc123", "Imported B")],
+      environmentId: env,
+      excludeThreadId: null,
+      query: pasted,
+    });
+    expect(items.map((item) => item.thread.threadId)).toEqual([pasted]);
+  });
+});

packages/client-runtime/src/composerThreadItems.ts

@@ -28,15 +28,17 @@ export function matchComposerThreadItems(input: {
   excludeThreadId: ThreadId | null;
   query: string;
 }): ComposerThreadItem[] {
-  const query = input.query.trim().toLowerCase();
+  const pastedId = input.query.trim();
+  const query = pastedId.toLowerCase();
   if (query.length === 0) return [];
   return input.shells
     .filter(
       (shell) =>
         shell.environmentId === input.environmentId &&
         shell.id !== input.excludeThreadId &&
         shell.archivedAt === null &&
-        shell.title.toLowerCase().includes(query),
+        // Thread IDs share long prefixes and are case-sensitive, so only the exact ID matches.
+        (shell.title.toLowerCase().includes(query) || shell.id === pastedId),
     )
     .sort((left, right) => right.updatedAt.localeCompare(left.updatedAt))
     .slice(0, COMPOSER_THREAD_RESULT_LIMIT)