diff --git a/packages/opencode/src/cli/cmd/tui/plugin.ts b/packages/opencode/src/cli/cmd/tui/plugin.ts
index ceae72c43c..9b5d24f3a3 100644
--- a/packages/opencode/src/cli/cmd/tui/plugin.ts
+++ b/packages/opencode/src/cli/cmd/tui/plugin.ts
@@ -18,7 +18,7 @@ import { resolvePluginTarget, uniqueModuleEntries } from "@/plugin/shared"
 import { registerThemes } from "./context/theme"
 
 type Slot = <K extends keyof TuiSlotMap>(props: { name: K } & TuiSlotMap[K]) => JSX.Element | null
-type InitInput<Renderer> = Omit<TuiPluginInput<Renderer>, "slots">
+type InitInput = Omit<TuiPluginInput<CliRenderer>, "slots">
 
 function empty<K extends keyof TuiSlotMap>(_props: { name: K } & TuiSlotMap[K]) {
   return null
@@ -44,22 +44,16 @@ function getThemes(value: unknown) {
   return value.themes
 }
 
-function isTuiPlugin<Renderer>(value: unknown): value is TuiPluginFn<Renderer> {
+function isTuiPlugin(value: unknown): value is TuiPluginFn<CliRenderer> {
   return typeof value === "function"
 }
 
-function getTuiPlugin<Renderer>(value: unknown) {
+function getTuiPlugin(value: unknown) {
   if (!isRecord(value) || !("tui" in value)) return
-  if (!isTuiPlugin<Renderer>(value.tui)) return
+  if (!isTuiPlugin(value.tui)) return
   return value.tui
 }
 
-function isCliRenderer(value: unknown): value is CliRenderer {
-  if (!isRecord(value)) return false
-  if (!("once" in value)) return false
-  return typeof value.once === "function"
-}
-
 export namespace TuiPlugin {
   const log = Log.create({ service: "tui.plugin" })
   let loaded: Promise<void> | undefined
@@ -67,11 +61,7 @@ export namespace TuiPlugin {
 
   export const Slot: Slot = (props) => view(props)
 
-  function setupSlots(renderer: unknown): TuiSlots {
-    if (!isCliRenderer(renderer)) {
-      throw new TypeError("Invalid TUI renderer")
-    }
-
+  function setupSlots(renderer: CliRenderer): TuiSlots {
     const reg = createSolidSlotRegistry<TuiSlotMap, TuiSlotContext>(
       renderer,
       {},
@@ -98,7 +88,7 @@ export namespace TuiPlugin {
     }
   }
 
-  export async function init<Renderer>(input: InitInput<Renderer>) {
+  export async function init(input: InitInput) {
     if (loaded) return loaded
     loaded = load({
       ...input,
@@ -107,7 +97,7 @@ export namespace TuiPlugin {
     return loaded
   }
 
-  async function load<Renderer>(input: TuiPluginInput<Renderer>) {
+  async function load(input: TuiPluginInput<CliRenderer>) {
     const dir = process.cwd()
 
     await Instance.provide({
@@ -148,7 +138,7 @@ export namespace TuiPlugin {
             const slotPlugin = getTuiSlotPlugin(entry)
             if (slotPlugin) input.slots.register(slotPlugin)
 
-            const tuiPlugin = getTuiPlugin<Renderer>(entry)
+            const tuiPlugin = getTuiPlugin(entry)
             if (!tuiPlugin) continue
             await tuiPlugin(input, Config.pluginOptions(item))
           }
diff --git a/packages/opencode/test/cli/tui/plugin-loader.test.ts b/packages/opencode/test/cli/tui/plugin-loader.test.ts
index a57993a3c0..c425a91c42 100644
--- a/packages/opencode/test/cli/tui/plugin-loader.test.ts
+++ b/packages/opencode/test/cli/tui/plugin-loader.test.ts
@@ -3,6 +3,7 @@ import fs from "fs/promises"
 import path from "path"
 import { pathToFileURL } from "url"
 import { createOpencodeClient } from "@opencode-ai/sdk/v2"
+import type { CliRenderer } from "@opentui/core"
 import { tmpdir } from "../../fixture/fixture"
 import { Log } from "../../../src/util/log"
 
@@ -80,6 +81,13 @@ test("ignores function-only tui exports and loads object exports", async () => {
   process.env.OPENCODE_TUI_CONFIG = tmp.extra.configPath
   const cwd = spyOn(process, "cwd").mockImplementation(() => tmp.path)
 
+  const renderer = {
+    ...Object.create(null),
+    once(this: CliRenderer) {
+      return this
+    },
+  } satisfies CliRenderer
+
   try {
     await TuiPlugin.init({
       client: createOpencodeClient({
@@ -88,9 +96,7 @@ test("ignores function-only tui exports and loads object exports", async () => {
       event: {
         on: () => () => {},
       },
-      renderer: {
-        once: () => undefined,
-      },
+      renderer,
     })
 
     expect(await fs.readFile(tmp.extra.objMarker, "utf8")).toBe("called")