spike: CopilotKit 1.74 / AG-UI 0.0.59 and Tauri 2.12 adoption review #67

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1. bravew

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   area:frontendFrontend (src/)Frontend (src/)

   on Sep 27, 2026
2. bravew commented on Sep 28, 2026

   

   bravew

   on Sep 28, 2026

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   Spike findings

   CopilotKit 1.74 — nothing to adopt. Upstream fix #7243 ("stop per-message state cloning and virtual-scroll tug of war") lives entirely inside @copilotkit/react-ui's CopilotChatMessageView/CopilotChatView. Neumar has no @copilotkit/react-ui dependency at all (package.json only lists @copilotkit/react-core and @copilotkit/shared) and no usage of those components — the chat UI is fully custom on useAgent() + a Zustand store. The cloneMessages/cloneFiles calls in thread-store.ts and the isRunning-tracking workaround in agui-provider.tsx are Neumar-authored defensive code, unrelated to the upstream bug class #7243 fixes.

   Side note (environment, not code): local node_modules resolved @copilotkit/react-core to 1.69.0 and @ag-ui/client to 0.0.58 despite package.json/lockfile correctly pinning 1.74.0/0.0.59 — a stale install from before PR #61, not a code issue. Re-running pnpm install --frozen-lockfile resolves it.

   Tauri 2.12 — one concrete follow-up, filed as #86. Cargo.lock still resolves tray-icon/muda to versions predating 2.12.0's fix for tray left-click being swallowed on macOS 27 (upstream tauri-apps/tauri#16035) — the transitive bump was never picked up after the Cargo.toml version bump. Other 2.12 items checked and ruled out: the new activation API doesn't match Neumar's existing custom NSApplication.activateIgnoringOtherApps use case; the exit() API doesn't replace plugin-process's relaunch() usage; the asset:// fixes are already active automatically via the core version bump, no lockfile gap there.

   No further follow-up issues from this spike.
3. bravew commented on Sep 28, 2026

   

   bravew

   on Sep 28, 2026

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   Research only. No CopilotKit or Tauri code change comes out of this.

   CopilotKit 1.70–1.74 (@copilotkit/react-core is already ^1.74.0). 1.70–1.73 are React Native, Vue, BuiltInAgent, and inspector work. We use useAgent from react-core/v2 in src/shared/providers/agui-provider.tsx and do not render CopilotKit's message list. 1.74's "stop per-message state cloning and the virtual-scroll tug of war" (#7243) is inside that list. Our virtualized ChatPanel and the Zustand mirror are our own and do not duplicate that clone loop, so there is nothing to delete.

   The local workaround that stays: agui-provider.tsx does not copy agent.isRunning, because the client can leave it true after RUN_FINISHED. The 1.70–1.74 notes do not say that flag was fixed.

   AG-UI 0.0.59 is already the installed @ag-ui/client and @ag-ui/core. No caller in src-api/src/app/api/copilotkit.ts is waiting on a 0.0.59 API.

   Tauri 2.12 is already the tauri pin. The one fix that was not actually shipping is tray-icon 0.25 / muda 0.20 for the macOS 27 left-click menu (#16035). Cargo.lock was gitignored, so a local cargo update never reached other builds. That lock is now tracked in #102 and closes #86.

   The rest of the 2.12 notes do not map onto this app: Liquid Glass and appDirectoriesOverride are new opt-in APIs and we do not use window effects or a portable data root; the Android activity fixes do not apply to the desktop shell; exit without plugin-process is redundant because we already depend on that plugin. No further follow-up issues.
4. bravew

   closed this as completedon Sep 28, 2026