diff --git a/packages/opencode/src/cli/cmd/tui/plugin.ts b/packages/opencode/src/cli/cmd/tui/plugin.ts
index 44d918afeb..4a3aa7261d 100644
--- a/packages/opencode/src/cli/cmd/tui/plugin.ts
+++ b/packages/opencode/src/cli/cmd/tui/plugin.ts
@@ -12,8 +12,9 @@ import "@opentui/solid/preload"
 import { Config } from "@/config/config"
 import { TuiConfig } from "@/config/tui"
 import { Log } from "@/util/log"
-import { BunProc } from "@/bun"
+import { isRecord } from "@/util/record"
 import { Instance } from "@/project/instance"
+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
@@ -22,12 +23,6 @@ function empty<K extends keyof TuiSlotMap>(_props: { name: K } & TuiSlotMap[K])
   return null
 }
 
-function isRecord(value: unknown): value is Record<string, unknown> {
-  if (!value || typeof value !== "object") return false
-  if (Array.isArray(value)) return false
-  return true
-}
-
 function isTuiSlotPlugin(value: unknown): value is SolidPlugin<TuiSlotMap, TuiSlotContext> {
   if (!isRecord(value)) return false
   if (typeof value.id !== "string") return false
@@ -99,14 +94,6 @@ export namespace TuiPlugin {
     return loaded
   }
 
-  async function resolve(spec: string) {
-    if (spec.startsWith("file://")) return spec
-    const lastAtIndex = spec.lastIndexOf("@")
-    const pkg = lastAtIndex > 0 ? spec.substring(0, lastAtIndex) : spec
-    const version = lastAtIndex > 0 ? spec.substring(lastAtIndex + 1) : "latest"
-    return BunProc.install(pkg, version)
-  }
-
   async function load<Renderer>(input: TuiPluginInput<Renderer>) {
     const dir = process.cwd()
 
@@ -120,7 +107,7 @@ export namespace TuiPlugin {
         for (const item of plugins) {
           const spec = Config.pluginSpecifier(item)
           log.info("loading tui plugin", { path: spec })
-          const target = await resolve(spec).catch((error) => {
+          const target = await resolvePluginTarget(spec).catch((error) => {
             log.error("failed to resolve tui plugin", { path: spec, error })
             return
           })
@@ -132,10 +119,7 @@ export namespace TuiPlugin {
           })
           if (!mod) continue
 
-          const seen = new Set<unknown>()
-          for (const [name, entry] of Object.entries(mod)) {
-            if (seen.has(entry)) continue
-            seen.add(entry)
+          for (const [name, entry] of uniqueModuleEntries(mod)) {
             if (!entry || typeof entry !== "object") {
               log.warn("ignoring non-object tui plugin export", {
                 path: spec,
diff --git a/packages/opencode/src/config/config.ts b/packages/opencode/src/config/config.ts
index a10ee0d2ab..a795ca477c 100644
--- a/packages/opencode/src/config/config.ts
+++ b/packages/opencode/src/config/config.ts
@@ -32,6 +32,7 @@ import { Glob } from "../util/glob"
 import { PackageRegistry } from "@/bun/registry"
 import { proxied } from "@/util/proxied"
 import { iife } from "@/util/iife"
+import { isRecord } from "@/util/record"
 import { Control } from "@/control"
 import { ConfigPaths } from "./paths"
 import { Filesystem } from "@/util/filesystem"
@@ -1324,10 +1325,6 @@ export namespace Config {
     return candidates[0]
   }
 
-  function isRecord(value: unknown): value is Record<string, unknown> {
-    return !!value && typeof value === "object" && !Array.isArray(value)
-  }
-
   function patchJsonc(input: string, patch: unknown, path: string[] = []): string {
     if (!isRecord(patch)) {
       const edits = modify(input, path, patch, {
diff --git a/packages/opencode/src/config/tui.ts b/packages/opencode/src/config/tui.ts
index 5e8c212a18..596673cb43 100644
--- a/packages/opencode/src/config/tui.ts
+++ b/packages/opencode/src/config/tui.ts
@@ -8,6 +8,7 @@ import { TuiInfo } from "./tui-schema"
 import { Instance } from "@/project/instance"
 import { Flag } from "@/flag/flag"
 import { Log } from "@/util/log"
+import { isRecord } from "@/util/record"
 import { Global } from "@/global"
 
 export namespace TuiConfig {
@@ -100,12 +101,6 @@ export namespace TuiConfig {
     await Promise.all(deps)
   }
 
-  function isRecord(value: unknown): value is Record<string, unknown> {
-    if (!value || typeof value !== "object") return false
-    if (Array.isArray(value)) return false
-    return true
-  }
-
   async function loadFile(filepath: string): Promise<Info> {
     const text = await ConfigPaths.readFile(filepath)
     if (!text) return {}
diff --git a/packages/opencode/src/plugin/index.ts b/packages/opencode/src/plugin/index.ts
index fe8e01e1a2..69c3e39754 100644
--- a/packages/opencode/src/plugin/index.ts
+++ b/packages/opencode/src/plugin/index.ts
@@ -4,13 +4,13 @@ import { Bus } from "../bus"
 import { Log } from "../util/log"
 import { createOpencodeClient } from "@opencode-ai/sdk"
 import { Server } from "../server/server"
-import { BunProc } from "../bun"
 import { Instance } from "../project/instance"
 import { Flag } from "../flag/flag"
 import { CodexAuthPlugin } from "./codex"
 import { Session } from "../session"
 import { NamedError } from "@opencode-ai/util/error"
 import { CopilotAuthPlugin } from "./copilot"
+import { parsePluginSpecifier, resolvePluginTarget, uniqueModuleEntries } from "./shared"
 import { gitlabAuthPlugin as GitlabAuthPlugin } from "@gitlab/opencode-gitlab-auth"
 
 export namespace Plugin {
@@ -55,25 +55,22 @@ export namespace Plugin {
     }
 
     async function resolve(spec: string) {
-      if (spec.startsWith("file://")) return spec
-      const lastAtIndex = spec.lastIndexOf("@")
-      const pkg = lastAtIndex > 0 ? spec.substring(0, lastAtIndex) : spec
-      const version = lastAtIndex > 0 ? spec.substring(lastAtIndex + 1) : "latest"
-      const builtIn = BUILTIN.some((x) => x.startsWith(pkg + "@"))
-      const installed = await BunProc.install(pkg, version).catch((err) => {
+      const parsed = parsePluginSpecifier(spec)
+      const builtIn = BUILTIN.some((x) => x.startsWith(parsed.pkg + "@"))
+      const target = await resolvePluginTarget(spec, parsed).catch((err) => {
         const cause = err instanceof Error ? err.cause : err
         const detail = cause instanceof Error ? cause.message : String(cause ?? err)
-        log.error("failed to install plugin", { pkg, version, error: detail })
+        log.error("failed to install plugin", { pkg: parsed.pkg, version: parsed.version, error: detail })
         const label = builtIn ? "built-in plugin" : "plugin"
         Bus.publish(Session.Event.Error, {
           error: new NamedError.Unknown({
-            message: `Failed to install ${label} ${pkg}@${version}: ${detail}`,
+            message: `Failed to install ${label} ${parsed.pkg}@${parsed.version}: ${detail}`,
           }).toObject(),
         })
         return ""
       })
-      if (!installed) return
-      return installed
+      if (!target) return
+      return target
     }
 
     function isServerPlugin(value: unknown): value is PluginInstance {
@@ -108,11 +105,8 @@ export namespace Plugin {
 
       // Prevent duplicate initialization when plugins export the same function
       // as both a named export and default export (e.g., `export const X` and `export default X`).
-      // Object.entries(mod) would return both entries pointing to the same function reference.
-      const seen = new Set<unknown>()
-      for (const entry of Object.values(mod)) {
-        if (seen.has(entry)) continue
-        seen.add(entry)
+      // uniqueModuleEntries keeps only the first export for each shared value reference.
+      for (const [, entry] of uniqueModuleEntries(mod)) {
         const server = getServerPlugin(entry)
         if (!server) continue
         const init = await server(input, Config.pluginOptions(item)).catch((err) => {
diff --git a/packages/opencode/src/plugin/shared.ts b/packages/opencode/src/plugin/shared.ts
new file mode 100644
index 0000000000..a9af073961
--- /dev/null
+++ b/packages/opencode/src/plugin/shared.ts
@@ -0,0 +1,26 @@
+import { BunProc } from "@/bun"
+
+export function parsePluginSpecifier(spec: string) {
+  const at = spec.lastIndexOf("@")
+  const pkg = at > 0 ? spec.substring(0, at) : spec
+  const version = at > 0 ? spec.substring(at + 1) : "latest"
+  return { pkg, version }
+}
+
+export async function resolvePluginTarget(spec: string, parsed = parsePluginSpecifier(spec)) {
+  if (spec.startsWith("file://")) return spec
+  return BunProc.install(parsed.pkg, parsed.version)
+}
+
+export function uniqueModuleEntries(mod: Record<string, unknown>) {
+  const seen = new Set<unknown>()
+  const entries: [string, unknown][] = []
+
+  for (const [name, entry] of Object.entries(mod)) {
+    if (seen.has(entry)) continue
+    seen.add(entry)
+    entries.push([name, entry])
+  }
+
+  return entries
+}
diff --git a/packages/opencode/src/util/record.ts b/packages/opencode/src/util/record.ts
new file mode 100644
index 0000000000..495927463b
--- /dev/null
+++ b/packages/opencode/src/util/record.ts
@@ -0,0 +1,3 @@
+export function isRecord(value: unknown): value is Record<string, unknown> {
+  return !!value && typeof value === "object" && !Array.isArray(value)
+}