diff --git a/packages/app/src/app.tsx b/packages/app/src/app.tsx
index a3cb88aea..002090491 100644
--- a/packages/app/src/app.tsx
+++ b/packages/app/src/app.tsx
@@ -77,6 +77,7 @@ import { SessionPage, SessionRouteErrorBoundary, TargetSessionRouteContent } fro
 import { NewHome } from "@/pages/home"
 import { LegacyHome } from "@/pages/home/legacy-home"
 import { AmicodeFileRefBridge } from "@/components/amicode-file-ref-bridge"
+import { DevToolsReopenBridge } from "@/components/settings-dialog"
 
 const NewSession = lazy(() => import("@/pages/new-session"))
 
@@ -501,6 +502,7 @@ export function AppBaseProviders(props: ParentProps<{ locale?: Locale }>) {
               <QueryProvider>
                 <WslServersProvider>
                   <DialogProvider>
+                    <DevToolsReopenBridge />
                     <MarkedProvider>
                       <FileComponentProvider component={File}>{props.children}</FileComponentProvider>
                     </MarkedProvider>
diff --git a/packages/app/src/components/settings-dialog.tsx b/packages/app/src/components/settings-dialog.tsx
index 46dd89ade..3140df21b 100644
--- a/packages/app/src/components/settings-dialog.tsx
+++ b/packages/app/src/components/settings-dialog.tsx
@@ -4,7 +4,7 @@ import { useCommand } from "@/context/command"
 import { useLanguage } from "@/context/language"
 import { useDialog } from "@opencode-ai/ui/context/dialog"
 
-export function useSettingsDialog(defaultValue?: string) {
+export function useSettingsDialog(defaultValue?: string, scrollTo?: string) {
   const dialog = useDialog()
   const params = useParams<{ id?: string }>()
   let run = 0
@@ -19,7 +19,7 @@ export function useSettingsDialog(defaultValue?: string) {
     const sessionID = params.id
     void import("@/components/settings-v2").then((module) => {
       if (dead || run !== current) return
-      void dialog.show(() => <module.DialogSettings sessionID={sessionID} defaultValue={defaultValue} />)
+      void dialog.show(() => <module.DialogSettings sessionID={sessionID} defaultValue={defaultValue} scrollTo={scrollTo} />)
     })
   }
 }
@@ -41,3 +41,8 @@ export function useSettingsCommand() {
 
   return show
 }
+
+/** @deprecated — reopen logic moved into useSettingsCommand which has full context */
+export function DevToolsReopenBridge() {
+  return null
+}
diff --git a/packages/app/src/components/settings-v2/developer-tools-controller.ts b/packages/app/src/components/settings-v2/developer-tools-controller.ts
new file mode 100644
index 000000000..162e99e1e
--- /dev/null
+++ b/packages/app/src/components/settings-v2/developer-tools-controller.ts
@@ -0,0 +1,189 @@
+import { createSignal, onCleanup, onMount } from "solid-js"
+import { useSettings } from "@/context/settings"
+import { inAmicode } from "@/utils/amicode-bridge"
+
+export interface DevToolsStatus {
+  opencodeValid: boolean
+  opencodeError?: string
+  amicodeValid: boolean
+  amicodeError?: string
+  serverRestarted: boolean
+  reloadNeeded: boolean
+  building?: boolean
+  buildError?: string
+}
+
+export type RebuildState = "idle" | "rebuilding" | "rebuilt" | "failed"
+
+/** Default repo paths autofilled when the toggle is turned ON with empty fields. */
+const DEFAULT_OPENCODE_PATH = "~/harmoniqs/opencode"
+const DEFAULT_AMICODE_PATH = "~/harmoniqs/amicode"
+
+export function createDeveloperToolsController() {
+  const settings = useSettings()
+  const [status, setStatus] = createSignal<DevToolsStatus | undefined>(undefined)
+  const [pending, setPending] = createSignal(false)
+  const [rebuildState, setRebuildState] = createSignal<RebuildState>("idle")
+  const [rebuildError, setRebuildError] = createSignal<string | undefined>(undefined)
+
+  // On mount, check if we just came back from a successful rebuild reload
+  onMount(() => {
+    try {
+      if (localStorage.getItem("amicode:devtools-rebuilt") === "1") {
+        localStorage.removeItem("amicode:devtools-rebuilt")
+        setRebuildState("rebuilt")
+        // Clear the "rebuilt" badge after 5 seconds
+        setTimeout(() => setRebuildState("idle"), 5000)
+      }
+    } catch {
+      // non-critical
+    }
+  })
+
+  // Listen for the extension host's replies
+  const handleMessage = (event: MessageEvent) => {
+    const d = event.data
+    if (d && d.source === "amicode" && d.kind === "dev-tools-status") {
+      setStatus({
+        opencodeValid: d.opencodeValid ?? true,
+        opencodeError: d.opencodeError,
+        amicodeValid: d.amicodeValid ?? true,
+        amicodeError: d.amicodeError,
+        serverRestarted: d.serverRestarted ?? false,
+        reloadNeeded: d.reloadNeeded ?? false,
+        building: d.building ?? false,
+        buildError: d.buildError,
+      })
+      setPending(false)
+
+      // When a reload is needed (extension was rebuilt), set a flag so the app
+      // reopens settings at the developer tools section after the reload.
+      if (d.reloadNeeded) {
+        try {
+          localStorage.setItem("amicode:devtools-reopen", "1")
+          localStorage.setItem("amicode:devtools-rebuilt", "1")
+        } catch {
+          // localStorage unavailable — non-critical
+        }
+      }
+    }
+
+    // Rebuild status messages
+    if (d && d.source === "amicode" && d.kind === "dev-tools-rebuild-status") {
+      if (d.state === "rebuilding") {
+        setRebuildState("rebuilding")
+        setRebuildError(undefined)
+      } else if (d.state === "failed") {
+        setRebuildState("failed")
+        setRebuildError(d.error ?? "Unknown error")
+      }
+      // "done" state triggers a reload — the "rebuilt" flag is read on next mount
+    }
+  }
+
+  if (typeof window !== "undefined") {
+    window.addEventListener("message", handleMessage)
+    onCleanup(() => window.removeEventListener("message", handleMessage))
+  }
+
+  const sendUpdate = () => {
+    if (!inAmicode()) return
+    setPending(true)
+    setStatus(undefined)
+    window.parent.postMessage(
+      {
+        source: "amicode",
+        kind: "dev-tools-update",
+        enabled: settings.developer.enabled(),
+        opencodePath: settings.developer.opencodePath(),
+        amicodePath: settings.developer.amicodePath(),
+      },
+      "*",
+    )
+  }
+
+  const rebuild = (mode: "local" | "remote") => {
+    if (!inAmicode()) return
+    if (rebuildState() === "rebuilding") return // prevent double-clicks
+    setRebuildState("rebuilding")
+    setRebuildError(undefined)
+    try {
+      localStorage.setItem("amicode:devtools-reopen", "1")
+      localStorage.setItem("amicode:devtools-rebuilt", "1")
+    } catch {
+      // non-critical
+    }
+    window.parent.postMessage(
+      {
+        source: "amicode",
+        kind: "dev-tools-rebuild",
+        mode,
+        opencodePath: settings.developer.opencodePath(),
+        amicodePath: settings.developer.amicodePath(),
+      },
+      "*",
+    )
+  }
+
+  return {
+    enabled: settings.developer.enabled,
+    setEnabled: (value: boolean) => {
+      // Autofill paths with defaults when toggling ON with empty fields
+      if (value) {
+        if (!settings.developer.opencodePath()) {
+          settings.developer.setOpencodePath(DEFAULT_OPENCODE_PATH)
+        }
+        if (!settings.developer.amicodePath()) {
+          settings.developer.setAmicodePath(DEFAULT_AMICODE_PATH)
+        }
+      }
+      // Don't persist enabled=false — the marketplace build doesn't render
+      // Developer Tools at all, and persisting false prevents the dev build
+      // from showing it after a bash-script bootstrap without toggle interaction.
+      if (value) {
+        settings.developer.setEnabled(value)
+        // Toggle ON: trigger a full rebuild (shows "Rebuilding..." status)
+        rebuild("local")
+      } else {
+        // Toggle OFF: show switching status, then the extension restores + reloads.
+        // Don't persist false — the reload brings up the marketplace build which
+        // doesn't have this section anyway.
+        setRebuildState("rebuilding")
+        setRebuildError(undefined)
+        // Send enabled=false explicitly (can't rely on the signal since we didn't persist it)
+        if (!inAmicode()) return
+        setPending(true)
+        setStatus(undefined)
+        window.parent.postMessage(
+          {
+            source: "amicode",
+            kind: "dev-tools-update",
+            enabled: false,
+            opencodePath: settings.developer.opencodePath(),
+            amicodePath: settings.developer.amicodePath(),
+          },
+          "*",
+        )
+      }
+    },
+    opencodePath: settings.developer.opencodePath,
+    setOpencodePath: (value: string) => {
+      settings.developer.setOpencodePath(value)
+    },
+    amicodePath: settings.developer.amicodePath,
+    setAmicodePath: (value: string) => {
+      settings.developer.setAmicodePath(value)
+    },
+    /** Trigger validation + apply on blur */
+    commitOpencodePath: () => sendUpdate(),
+    commitAmicodePath: () => sendUpdate(),
+    /** Trigger a full rebuild (local = from disk, remote = git pull first) */
+    rebuild,
+    status,
+    pending,
+    rebuildState,
+    rebuildError,
+  }
+}
+
+export type DeveloperToolsController = ReturnType<typeof createDeveloperToolsController>
diff --git a/packages/app/src/components/settings-v2/developer-tools.tsx b/packages/app/src/components/settings-v2/developer-tools.tsx
new file mode 100644
index 000000000..1f53e7c8f
--- /dev/null
+++ b/packages/app/src/components/settings-v2/developer-tools.tsx
@@ -0,0 +1,181 @@
+import { Component, Match, Show, Switch } from "solid-js"
+import { Switch as ToggleSwitch } from "@opencode-ai/ui/v2/switch-v2"
+import { TextInputV2 } from "@opencode-ai/ui/v2/text-input-v2"
+import { ButtonV2 } from "@opencode-ai/ui/v2/button-v2"
+import { useLanguage } from "@/context/language"
+import { SettingsListV2 } from "./parts/list"
+import { SettingsRowV2 } from "./parts/row"
+import {
+  createDeveloperToolsController,
+  type DeveloperToolsController,
+} from "./developer-tools-controller"
+
+/** Status indicator shown below the section title during/after rebuilds. */
+const RebuildStatusIndicator: Component<{ controller: DeveloperToolsController }> = (props) => {
+  const language = useLanguage()
+  return (
+    <Switch>
+      <Match when={props.controller.rebuildState() === "rebuilding"}>
+        <div class="devtools-rebuild-status devtools-rebuild-status--building">
+          <span class="devtools-status-dot devtools-status-dot--orange" />
+          <span>{language.t("settings.general.row.devTools.rebuilding")}</span>
+        </div>
+      </Match>
+      <Match when={props.controller.rebuildState() === "rebuilt"}>
+        <div class="devtools-rebuild-status devtools-rebuild-status--done">
+          <span class="devtools-status-dot devtools-status-dot--green" />
+          <span>{language.t("settings.general.row.devTools.rebuilt")}</span>
+        </div>
+      </Match>
+      <Match when={props.controller.rebuildState() === "failed"}>
+        <div class="devtools-rebuild-status devtools-rebuild-status--failed">
+          <span class="devtools-status-dot devtools-status-dot--red" />
+          <span>{props.controller.rebuildError() ?? "Build failed"}</span>
+        </div>
+      </Match>
+    </Switch>
+  )
+}
+
+const DeveloperToolsContent: Component<{ controller: DeveloperToolsController }> = (props) => {
+  const language = useLanguage()
+  const opencodeError = () => {
+    const s = props.controller.status()
+    if (!s || s.opencodeValid) return undefined
+    return s.opencodeError ?? language.t("settings.general.row.opencodePath.error.notFound")
+  }
+  const amicodeError = () => {
+    const s = props.controller.status()
+    if (!s || s.amicodeValid) return undefined
+    if (s.buildError) return s.buildError
+    return s.amicodeError ?? language.t("settings.general.row.amicodePath.error.notFound")
+  }
+  const building = () => props.controller.status()?.building ?? false
+  const reloadNeeded = () => props.controller.status()?.reloadNeeded ?? false
+  const isRebuilding = () => props.controller.rebuildState() === "rebuilding"
+
+  return (
+    <SettingsListV2>
+      {/* Rebuild buttons */}
+      <Show when={props.controller.enabled()}>
+        <div class="devtools-rebuild-row">
+          <ButtonV2
+            size="small"
+            variant="neutral"
+            onClick={() => props.controller.rebuild("local")}
+            disabled={isRebuilding()}
+          >
+            {language.t("settings.general.row.devTools.rebuildLocally")}
+          </ButtonV2>
+          <ButtonV2
+            size="small"
+            variant="neutral"
+            onClick={() => props.controller.rebuild("remote")}
+            disabled={isRebuilding()}
+          >
+            {language.t("settings.general.row.devTools.rebuildRemotely")}
+          </ButtonV2>
+        </div>
+      </Show>
+
+      <SettingsRowV2
+        title={language.t("settings.general.row.developerMode.title")}
+        description={language.t("settings.general.row.developerMode.description")}
+      >
+        <div data-action="settings-developer-mode">
+          <ToggleSwitch
+            checked={props.controller.enabled()}
+            onChange={(checked) => props.controller.setEnabled(checked)}
+          />
+        </div>
+      </SettingsRowV2>
+
+      <SettingsRowV2
+        title={language.t("settings.general.row.opencodePath.title")}
+        description={
+          <>
+            {language.t("settings.general.row.opencodePath.description")}
+            <Show when={opencodeError()}>
+              <span class="settings-v2-field-error">{opencodeError()}</span>
+            </Show>
+          </>
+        }
+      >
+        <div class="w-full sm:w-[280px]">
+          <TextInputV2
+            data-action="settings-opencode-path"
+            type="text"
+            appearance="base"
+            value={props.controller.opencodePath()}
+            onInput={(event) => props.controller.setOpencodePath(event.currentTarget.value)}
+            onBlur={() => props.controller.commitOpencodePath()}
+            placeholder={language.t("settings.general.row.opencodePath.placeholder")}
+            disabled={!props.controller.enabled()}
+            spellcheck={false}
+            autocorrect="off"
+            autocomplete="off"
+            autocapitalize="off"
+            aria-label={language.t("settings.general.row.opencodePath.title")}
+          />
+        </div>
+      </SettingsRowV2>
+
+      <SettingsRowV2
+        title={language.t("settings.general.row.amicodePath.title")}
+        description={
+          <>
+            {language.t("settings.general.row.amicodePath.description")}
+            <Show when={building()}>
+              <span class="settings-v2-field-info">
+                {language.t("settings.general.row.amicodePath.building")}
+              </span>
+            </Show>
+            <Show when={amicodeError()}>
+              <span class="settings-v2-field-error">{amicodeError()}</span>
+            </Show>
+            <Show when={reloadNeeded()}>
+              <span class="settings-v2-field-warning">
+                {language.t("settings.general.row.amicodePath.reloadNeeded")}
+              </span>
+            </Show>
+          </>
+        }
+      >
+        <div class="w-full sm:w-[280px]">
+          <TextInputV2
+            data-action="settings-amicode-path"
+            type="text"
+            appearance="base"
+            value={props.controller.amicodePath()}
+            onInput={(event) => props.controller.setAmicodePath(event.currentTarget.value)}
+            onBlur={() => props.controller.commitAmicodePath()}
+            placeholder={language.t("settings.general.row.amicodePath.placeholder")}
+            disabled={!props.controller.enabled()}
+            spellcheck={false}
+            autocorrect="off"
+            autocomplete="off"
+            autocapitalize="off"
+            aria-label={language.t("settings.general.row.amicodePath.title")}
+          />
+        </div>
+      </SettingsRowV2>
+    </SettingsListV2>
+  )
+}
+
+export const DeveloperToolsSection: Component = () => {
+  const language = useLanguage()
+  const controller = createDeveloperToolsController()
+
+  return (
+    <div id="settings-developer-tools" class="settings-v2-section">
+      <div class="devtools-section-header">
+        <h3 class="settings-v2-section-title">
+          {language.t("settings.general.section.developerTools")}
+        </h3>
+        <RebuildStatusIndicator controller={controller} />
+      </div>
+      <DeveloperToolsContent controller={controller} />
+    </div>
+  )
+}
diff --git a/packages/app/src/components/settings-v2/dialog-settings-v2.tsx b/packages/app/src/components/settings-v2/dialog-settings-v2.tsx
index eeb5565fa..4a4e10e4d 100644
--- a/packages/app/src/components/settings-v2/dialog-settings-v2.tsx
+++ b/packages/app/src/components/settings-v2/dialog-settings-v2.tsx
@@ -1,4 +1,4 @@
-import { Component, createMemo, createSignal, startTransition } from "solid-js"
+import { Component, createMemo, createSignal, onMount, startTransition } from "solid-js"
 import { Dialog } from "@opencode-ai/ui/v2/dialog-v2"
 import { TabsV2 } from "@opencode-ai/ui/v2/tabs-v2"
 import { Icon } from "@opencode-ai/ui/icon"
@@ -19,6 +19,7 @@ import { useServerSync } from "@/context/server-sync"
 export const DialogSettings: Component<{
   sessionID?: string
   defaultValue?: string
+  scrollTo?: string
 }> = (props) => {
   const language = useLanguage()
   const platform = usePlatform()
@@ -27,6 +28,17 @@ export const DialogSettings: Component<{
   const tabs = useTabs()
   const serverSync = useServerSync()
   const [tab, setTab] = createSignal(props.defaultValue ?? "general")
+
+  // After mount, scroll to the target section if specified
+  onMount(() => {
+    if (props.scrollTo) {
+      // Delay to ensure DOM is rendered after tab switch
+      setTimeout(() => {
+        const el = document.getElementById(props.scrollTo!)
+        el?.scrollIntoView({ behavior: "smooth", block: "start" })
+      }, 100)
+    }
+  })
   const directory = createMemo(() => {
     const route = layout.route()
     if (route.type === "dir-new-sesssion") return route.dir
diff --git a/packages/app/src/components/settings-v2/general.tsx b/packages/app/src/components/settings-v2/general.tsx
index c0a856c22..c56fe699a 100644
--- a/packages/app/src/components/settings-v2/general.tsx
+++ b/packages/app/src/components/settings-v2/general.tsx
@@ -25,6 +25,7 @@ import {
   type ShellSettingsController,
   type SoundSettingsController,
 } from "./general-controllers"
+import { DeveloperToolsSection } from "./developer-tools"
 import "./settings-v2.css"
 
 const schemeOptions: ("system" | "light" | "dark")[] = ["system", "light", "dark"]
@@ -568,6 +569,8 @@ export const SettingsGeneralV2: Component<{
         <DisplaySection />
 
         <AdvancedSection />
+
+        <DeveloperToolsSection />
       </div>
     </>
   )
diff --git a/packages/app/src/components/settings-v2/settings-v2.css b/packages/app/src/components/settings-v2/settings-v2.css
index 494f4d3e2..f6f1528ec 100644
--- a/packages/app/src/components/settings-v2/settings-v2.css
+++ b/packages/app/src/components/settings-v2/settings-v2.css
@@ -924,3 +924,18 @@
   text-overflow: ellipsis;
   white-space: nowrap;
 }
+
+/* Developer Tools / Data & Storage inline validation */
+.settings-v2-field-error {
+  display: block;
+  margin-top: 4px;
+  font-size: 12px;
+  color: var(--v2-text-text-danger, #e5534b);
+}
+
+.settings-v2-field-warning {
+  display: block;
+  margin-top: 4px;
+  font-size: 12px;
+  color: var(--v2-text-text-warning, #d29922);
+}
diff --git a/packages/app/src/components/titlebar-channel.test.ts b/packages/app/src/components/titlebar-channel.test.ts
new file mode 100644
index 000000000..54370b7df
--- /dev/null
+++ b/packages/app/src/components/titlebar-channel.test.ts
@@ -0,0 +1,19 @@
+import { describe, expect, test } from "bun:test"
+import { channelBadgeText } from "./titlebar-channel"
+
+describe("channelBadgeText", () => {
+  test("returns DEV when developer mode is enabled, regardless of channel", () => {
+    expect(channelBadgeText("beta", true)).toBe("DEV")
+    expect(channelBadgeText("dev", true)).toBe("DEV")
+    expect(channelBadgeText("prod", true)).toBe("DEV")
+  })
+
+  test("returns BETA on beta or dev channel when developer mode is off", () => {
+    expect(channelBadgeText("beta", false)).toBe("BETA")
+    expect(channelBadgeText("dev", false)).toBe("BETA")
+  })
+
+  test("returns null on prod channel when developer mode is off", () => {
+    expect(channelBadgeText("prod", false)).toBeNull()
+  })
+})
diff --git a/packages/app/src/components/titlebar-channel.ts b/packages/app/src/components/titlebar-channel.ts
new file mode 100644
index 000000000..3b873e9b1
--- /dev/null
+++ b/packages/app/src/components/titlebar-channel.ts
@@ -0,0 +1,12 @@
+/**
+ * Determines the badge text shown in the titlebar channel indicator.
+ *
+ * - Developer mode ON → "DEV" (regardless of build channel)
+ * - Developer mode OFF, beta/dev channel → "BETA"
+ * - Developer mode OFF, prod channel → null (no badge)
+ */
+export function channelBadgeText(channel: string, developerEnabled: boolean): "DEV" | "BETA" | null {
+  if (developerEnabled) return "DEV"
+  if (["beta", "dev"].includes(channel)) return "BETA"
+  return null
+}
diff --git a/packages/app/src/components/titlebar.tsx b/packages/app/src/components/titlebar.tsx
index f8d226dee..f69e7db2d 100644
--- a/packages/app/src/components/titlebar.tsx
+++ b/packages/app/src/components/titlebar.tsx
@@ -15,6 +15,7 @@ import { usePlatform } from "@/context/platform"
 import { useCommand } from "@/context/command"
 import { useLanguage } from "@/context/language"
 import { useSettings } from "@/context/settings"
+import { useSettingsDialog } from "@/components/settings-dialog"
 import { WindowsAppMenu } from "./windows-app-menu"
 import { applyPath, backPath, forwardPath } from "./titlebar-history"
 import { TitlebarTabStrip } from "@/components/titlebar-tab-strip"
@@ -26,6 +27,7 @@ import { ServerConnection, useServer } from "@/context/server"
 import { tabHref, useTabs, type Tab } from "@/context/tabs"
 import type { PromptSession } from "@/context/prompt"
 import { normalizeSessionInfo } from "@/utils/session"
+import { channelBadgeText } from "./titlebar-channel"
 import "./titlebar.css"
 
 const legacyTitlebarHeight = 40
@@ -76,6 +78,19 @@ export function Titlebar(props: { update?: TitlebarUpdate; debugTools?: { visibl
   }
   const windowsControlsWidth = () => `${windowsControlsBaseWidth / Math.max(titlebarZoom(), 1)}px`
 
+  // After a dev-tools rebuild + reload, auto-open settings at Developer Tools
+  const showDevTools = useSettingsDialog("general", "settings-developer-tools")
+  onMount(() => {
+    try {
+      if (localStorage.getItem("amicode:devtools-reopen") === "1") {
+        localStorage.removeItem("amicode:devtools-reopen")
+        setTimeout(showDevTools, 300)
+      }
+    } catch {
+      // non-critical
+    }
+  })
+
   const [history, setHistory] = createStore({
     stack: [] as string[],
     index: 0,
@@ -616,6 +631,11 @@ function TitlebarUpdateIconButton(props: { state: TitlebarUpdatePillState }) {
 
 function ChannelIndicator(props: { debugTools?: { visible: boolean; toggle: () => void } }) {
   const channel = import.meta.env.VITE_OPENCODE_CHANNEL
+  const settings = useSettings()
+
+  // When the build channel is "dev" AND debug tools are available, render
+  // the interactive DEV button (toggles the debug panel). This is the
+  // build-plumbing path for local opencode development.
   if (channel === "dev" && props.debugTools) {
     return (
       <button
@@ -630,15 +650,17 @@ function ChannelIndicator(props: { debugTools?: { visible: boolean; toggle: () =
     )
   }
 
+  // For release builds: show DEV when developer mode is enabled in settings
+  // (so the user knows they're running against a local binary/asset override),
+  // BETA when running a pre-release channel, or nothing on prod.
+  const badgeText = () => channelBadgeText(channel, settings.developer.enabled())
+  const badgeSlot = () => (badgeText() === "DEV" ? "amicode-dev-tag" : "amicode-beta-tag")
+
   return (
     <>
-      {["beta", "dev"].includes(import.meta.env.VITE_OPENCODE_CHANNEL) && (
-        // amicode: always reads BETA, in the brand gold. "DEV" is build plumbing
-        // (the channel a local build happens to compile under); BETA is the
-        // product state users should see. Gold ties it to the Amico wordmark
-        // instead of the generic interactive blue.
-        <div data-slot="amicode-beta-tag" class="font-medium px-2 rounded-sm uppercase font-mono">
-          BETA
+      {badgeText() && (
+        <div data-slot={badgeSlot()} class="font-medium px-2 rounded-sm uppercase font-mono">
+          {badgeText()}
         </div>
       )}
     </>
diff --git a/packages/app/src/context/settings.tsx b/packages/app/src/context/settings.tsx
index 218860397..9cf9b6f63 100644
--- a/packages/app/src/context/settings.tsx
+++ b/packages/app/src/context/settings.tsx
@@ -46,6 +46,11 @@ export interface Settings {
     sans: string
     terminal: string
   }
+  developer: {
+    enabled: boolean
+    opencodePath: string
+    amicodePath: string
+  }
   keybinds: Record<string, string>
   permissions: {
     autoApprove: boolean
@@ -202,6 +207,11 @@ const defaultSettings: Settings = {
     sans: "",
     terminal: "",
   },
+  developer: {
+    enabled: true,
+    opencodePath: "",
+    amicodePath: "",
+  },
   keybinds: {},
   permissions: {
     autoApprove: false,
@@ -533,6 +543,20 @@ export const { use: useSettings, provider: SettingsProvider } = createSimpleCont
           setStore("sounds", "errors", value)
         },
       },
+      developer: {
+        enabled: withFallback(() => store.developer?.enabled, defaultSettings.developer.enabled),
+        setEnabled(value: boolean) {
+          setStore("developer", "enabled", value)
+        },
+        opencodePath: withFallback(() => store.developer?.opencodePath, defaultSettings.developer.opencodePath),
+        setOpencodePath(value: string) {
+          setStore("developer", "opencodePath", value)
+        },
+        amicodePath: withFallback(() => store.developer?.amicodePath, defaultSettings.developer.amicodePath),
+        setAmicodePath(value: string) {
+          setStore("developer", "amicodePath", value)
+        },
+      },
     }
   },
 })
diff --git a/packages/app/src/i18n/ar.ts b/packages/app/src/i18n/ar.ts
index 7f8303b95..eabf42843 100644
--- a/packages/app/src/i18n/ar.ts
+++ b/packages/app/src/i18n/ar.ts
@@ -754,6 +754,28 @@ export const dict = {
   "settings.general.row.wayland.description": "تعطيل التراجع إلى X11 على Wayland. يتطلب إعادة التشغيل.",
   "settings.general.row.wayland.tooltip":
     "على Linux مع شاشات بمعدلات تحديث مختلطة، يمكن أن يكون Wayland الأصلي أكثر استقرارًا.",
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "ملاحظات الإصدار",
   "settings.general.row.releaseNotes.description": 'عرض نوافذ "ما الجديد" المنبثقة بعد التحديثات',
   "settings.updates.row.startup.title": "التحقق من التحديثات عند بدء التشغيل",
diff --git a/packages/app/src/i18n/br.ts b/packages/app/src/i18n/br.ts
index 2531546b7..b9afab02d 100644
--- a/packages/app/src/i18n/br.ts
+++ b/packages/app/src/i18n/br.ts
@@ -766,6 +766,28 @@ export const dict = {
   "settings.general.row.wayland.description": "Desabilitar fallback X11 no Wayland. Requer reinicialização.",
   "settings.general.row.wayland.tooltip":
     "No Linux com monitores de taxas de atualização mistas, Wayland nativo pode ser mais estável.",
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "Notas da versão",
   "settings.general.row.releaseNotes.description": 'Mostrar pop-ups de "Novidades" após atualizações',
   "settings.updates.row.startup.title": "Verificar atualizações ao iniciar",
diff --git a/packages/app/src/i18n/bs.ts b/packages/app/src/i18n/bs.ts
index 70255e867..2aaa1abde 100644
--- a/packages/app/src/i18n/bs.ts
+++ b/packages/app/src/i18n/bs.ts
@@ -832,6 +832,28 @@ export const dict = {
   "settings.general.row.wayland.tooltip":
     "Na Linuxu sa monitorima miješanih stopa osvježavanja, nativni Wayland može biti stabilniji.",
 
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "Bilješke o izdanju",
   "settings.general.row.releaseNotes.description": 'Prikaži iskačuće prozore "Šta je novo" nakon ažuriranja',
 
diff --git a/packages/app/src/i18n/da.ts b/packages/app/src/i18n/da.ts
index 895b3bbe7..5da01ace6 100644
--- a/packages/app/src/i18n/da.ts
+++ b/packages/app/src/i18n/da.ts
@@ -824,6 +824,28 @@ export const dict = {
   "settings.general.row.wayland.tooltip":
     "På Linux med skærme med blandet opdateringshastighed kan native Wayland være mere stabilt.",
 
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "Udgivelsesnoter",
   "settings.general.row.releaseNotes.description": 'Vis "Hvad er nyt"-popups efter opdateringer',
 
diff --git a/packages/app/src/i18n/de.ts b/packages/app/src/i18n/de.ts
index c830787a2..c573cbd8e 100644
--- a/packages/app/src/i18n/de.ts
+++ b/packages/app/src/i18n/de.ts
@@ -778,6 +778,28 @@ export const dict = {
   "settings.general.row.wayland.description": "X11-Fallback unter Wayland deaktivieren. Erfordert Neustart.",
   "settings.general.row.wayland.tooltip":
     "Unter Linux mit Monitoren unterschiedlicher Bildwiederholraten kann natives Wayland stabiler sein.",
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "Versionshinweise",
   "settings.general.row.releaseNotes.description": '"Neuigkeiten"-Pop-ups nach Updates anzeigen',
   "settings.updates.row.startup.title": "Beim Start nach Updates suchen",
diff --git a/packages/app/src/i18n/en.ts b/packages/app/src/i18n/en.ts
index def3084c2..62f1ecd8c 100644
--- a/packages/app/src/i18n/en.ts
+++ b/packages/app/src/i18n/en.ts
@@ -1002,6 +1002,29 @@ export const dict = {
   "settings.general.row.wayland.tooltip":
     "On Linux with mixed refresh-rate monitors, native Wayland can be more stable.",
 
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
+
   "settings.general.row.releaseNotes.title": "Release notes",
   "settings.general.row.releaseNotes.description": "Show What's New popups after updates",
 
diff --git a/packages/app/src/i18n/es.ts b/packages/app/src/i18n/es.ts
index 4c8da2695..398b91313 100644
--- a/packages/app/src/i18n/es.ts
+++ b/packages/app/src/i18n/es.ts
@@ -837,6 +837,28 @@ export const dict = {
   "settings.general.row.wayland.tooltip":
     "En Linux con monitores de frecuencia de actualización mixta, Wayland nativo puede ser más estable.",
 
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "Notas de la versión",
   "settings.general.row.releaseNotes.description":
     'Mostrar ventanas emergentes de "Novedades" después de las actualizaciones',
diff --git a/packages/app/src/i18n/fr.ts b/packages/app/src/i18n/fr.ts
index fbd039525..a9b6365ef 100644
--- a/packages/app/src/i18n/fr.ts
+++ b/packages/app/src/i18n/fr.ts
@@ -776,6 +776,28 @@ export const dict = {
   "settings.general.row.wayland.description": "Désactiver le repli X11 sur Wayland. Nécessite un redémarrage.",
   "settings.general.row.wayland.tooltip":
     "Sur Linux avec des moniteurs à taux de rafraîchissement mixte, Wayland natif peut être plus stable.",
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "Notes de version",
   "settings.general.row.releaseNotes.description": 'Afficher des pop-ups "Quoi de neuf" après les mises à jour',
   "settings.updates.row.startup.title": "Vérifier les mises à jour au démarrage",
diff --git a/packages/app/src/i18n/ja.ts b/packages/app/src/i18n/ja.ts
index c83d07c29..c5f858498 100644
--- a/packages/app/src/i18n/ja.ts
+++ b/packages/app/src/i18n/ja.ts
@@ -761,6 +761,28 @@ export const dict = {
   "settings.general.row.wayland.description": "WaylandでのX11フォールバックを無効にします。再起動が必要です。",
   "settings.general.row.wayland.tooltip":
     "リフレッシュレートが混在するモニターを使用しているLinuxでは、ネイティブWaylandの方が安定する場合があります。",
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "リリースノート",
   "settings.general.row.releaseNotes.description": "アップデート後に「新機能」ポップアップを表示",
   "settings.updates.row.startup.title": "起動時にアップデートを確認",
diff --git a/packages/app/src/i18n/ko.ts b/packages/app/src/i18n/ko.ts
index 452335b40..eee280c33 100644
--- a/packages/app/src/i18n/ko.ts
+++ b/packages/app/src/i18n/ko.ts
@@ -603,6 +603,28 @@ export const dict = {
   "settings.general.row.wayland.description": "Wayland에서 X11 폴백을 비활성화합니다. 다시 시작해야 합니다.",
   "settings.general.row.wayland.tooltip":
     "혼합 주사율 모니터가 있는 Linux에서는 네이티브 Wayland가 더 안정적일 수 있습니다.",
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "릴리스 노트",
   "settings.general.row.releaseNotes.description": "업데이트 후 '새 소식' 팝업 표시",
   "settings.updates.row.startup.title": "시작 시 업데이트 확인",
diff --git a/packages/app/src/i18n/no.ts b/packages/app/src/i18n/no.ts
index 0166636af..30aabc422 100644
--- a/packages/app/src/i18n/no.ts
+++ b/packages/app/src/i18n/no.ts
@@ -677,6 +677,28 @@ export const dict = {
   "settings.general.row.wayland.tooltip":
     "På Linux med skjermer med blandet oppdateringsfrekvens kan innebygd Wayland være mer stabilt.",
 
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "Utgivelsesnotater",
   "settings.general.row.releaseNotes.description": 'Vis "Hva er nytt"-vinduer etter oppdateringer',
 
diff --git a/packages/app/src/i18n/pl.ts b/packages/app/src/i18n/pl.ts
index 11a601e34..2a738841d 100644
--- a/packages/app/src/i18n/pl.ts
+++ b/packages/app/src/i18n/pl.ts
@@ -766,6 +766,28 @@ export const dict = {
   "settings.general.row.wayland.description": "Wyłącz fallback X11 na Wayland. Wymaga restartu.",
   "settings.general.row.wayland.tooltip":
     "Na Linuxie z monitorami o różnym odświeżaniu, natywny Wayland może być bardziej stabilny.",
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "Informacje o wydaniu",
   "settings.general.row.releaseNotes.description": 'Pokazuj wyskakujące okna "Co nowego" po aktualizacjach',
   "settings.updates.row.startup.title": "Sprawdzaj aktualizacje przy uruchomieniu",
diff --git a/packages/app/src/i18n/ru.ts b/packages/app/src/i18n/ru.ts
index c2aa58b58..9ee6ae4d1 100644
--- a/packages/app/src/i18n/ru.ts
+++ b/packages/app/src/i18n/ru.ts
@@ -833,6 +833,28 @@ export const dict = {
   "settings.general.row.wayland.tooltip":
     "На Linux с мониторами разной частоты обновления нативный Wayland может быть стабильнее.",
 
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "Примечания к выпуску",
   "settings.general.row.releaseNotes.description": 'Показывать всплывающие окна "Что нового" после обновлений',
 
diff --git a/packages/app/src/i18n/th.ts b/packages/app/src/i18n/th.ts
index 36cf63889..cf1b02b85 100644
--- a/packages/app/src/i18n/th.ts
+++ b/packages/app/src/i18n/th.ts
@@ -820,6 +820,28 @@ export const dict = {
   "settings.general.row.wayland.description": "ปิดใช้งาน X11 fallback บน Wayland ต้องรีสตาร์ท",
   "settings.general.row.wayland.tooltip": "บน Linux ที่มีจอภาพรีเฟรชเรตแบบผสม Wayland แบบเนทีฟอาจเสถียรกว่า",
 
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "บันทึกการอัปเดต",
   "settings.general.row.releaseNotes.description": "แสดงป๊อปอัพ What's New หลังจากอัปเดต",
 
diff --git a/packages/app/src/i18n/tr.ts b/packages/app/src/i18n/tr.ts
index a37f871d4..e3d965fbd 100644
--- a/packages/app/src/i18n/tr.ts
+++ b/packages/app/src/i18n/tr.ts
@@ -839,6 +839,28 @@ export const dict = {
   "settings.general.row.wayland.tooltip":
     "Karışık yenileme hızlı monitörlere sahip Linux'ta yerel Wayland daha kararlı olabilir.",
 
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "Sürüm notları",
   "settings.general.row.releaseNotes.description": "Güncellemelerden sonra Yenilikler bildirimlerini göster",
 
diff --git a/packages/app/src/i18n/uk.ts b/packages/app/src/i18n/uk.ts
index db77bd1aa..9423b04a3 100644
--- a/packages/app/src/i18n/uk.ts
+++ b/packages/app/src/i18n/uk.ts
@@ -926,6 +926,28 @@ export const dict = {
   "settings.general.row.wayland.tooltip":
     "На Linux з моніторами з різною частотою оновлення нативний Wayland може бути більш стабільним.",
 
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "Нотатки до релізу",
   "settings.general.row.releaseNotes.description": 'Показувати спливаючі вікна "Що нового" після оновлень',
 
diff --git a/packages/app/src/i18n/zh.ts b/packages/app/src/i18n/zh.ts
index 6b8aed0e6..45f88e027 100644
--- a/packages/app/src/i18n/zh.ts
+++ b/packages/app/src/i18n/zh.ts
@@ -813,6 +813,28 @@ export const dict = {
   "settings.general.row.wayland.title": "使用原生 Wayland",
   "settings.general.row.wayland.description": "在 Wayland 上禁用 X11 回退。需要重启。",
   "settings.general.row.wayland.tooltip": "在混合刷新率显示器的 Linux 系统上，原生 Wayland 可能更稳定。",
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "发行说明",
   "settings.general.row.releaseNotes.description": "更新后显示“新功能”弹窗",
 
diff --git a/packages/app/src/i18n/zht.ts b/packages/app/src/i18n/zht.ts
index a933b588e..f1205da20 100644
--- a/packages/app/src/i18n/zht.ts
+++ b/packages/app/src/i18n/zht.ts
@@ -810,6 +810,28 @@ export const dict = {
   "settings.general.row.wayland.description": "在 Wayland 上停用 X11 後備模式。需要重新啟動。",
   "settings.general.row.wayland.tooltip": "在混合更新率螢幕的 Linux 系統上，原生 Wayland 可能更穩定。",
 
+  "settings.general.section.developerTools": "Developer Tools",
+  "settings.general.row.developerMode.title": "Use developer build",
+  "settings.general.row.developerMode.description":
+    "Switch between the release and a local developer build of the opencode server and Amicode extension",
+  "settings.general.row.opencodePath.title": "opencode repo path",
+  "settings.general.row.opencodePath.description":
+    "Path to your local opencode repository root (the binary is resolved from here)",
+  "settings.general.row.opencodePath.placeholder": "~/harmoniqs/opencode",
+  "settings.general.row.opencodePath.error.notFound": "Binary not found at this path",
+  "settings.general.row.opencodePath.error.notExecutable": "Binary exists but is not executable",
+  "settings.general.row.amicodePath.title": "Amicode repo path",
+  "settings.general.row.amicodePath.description":
+    "Path to your local Amicode repository root (rebuilds extension and reloads on change)",
+  "settings.general.row.amicodePath.placeholder": "~/harmoniqs/amicode",
+  "settings.general.row.amicodePath.error.notFound": "Directory does not exist",
+  "settings.general.row.amicodePath.error.buildFailed": "Extension build failed",
+  "settings.general.row.amicodePath.building": "Building extension…",
+  "settings.general.row.amicodePath.reloadNeeded": "Reload to apply",
+  "settings.general.row.devTools.rebuildLocally": "Rebuild Locally",
+  "settings.general.row.devTools.rebuildRemotely": "Rebuild Remotely",
+  "settings.general.row.devTools.rebuilding": "Rebuilding…",
+  "settings.general.row.devTools.rebuilt": "Rebuilt!",
   "settings.general.row.releaseNotes.title": "發行說明",
   "settings.general.row.releaseNotes.description": "更新後顯示「新功能」彈出視窗",
 
diff --git a/packages/ui/src/amicode/amicode.css b/packages/ui/src/amicode/amicode.css
index ba5b8230f..5a5506d98 100644
--- a/packages/ui/src/amicode/amicode.css
+++ b/packages/ui/src/amicode/amicode.css
@@ -1474,6 +1474,62 @@
   background: color-mix(in srgb, var(--amber-dark-9) 18%, transparent);
 }
 
+/* ---- DEV channel tag (titlebar) ----------------------------------------- */
+/* Green pill signals developer mode is active — visually distinct from the
+   amber BETA so you never confuse a dev build with a release. Uses the
+   semantic success scale (auto light/dark via theme.css). */
+[data-slot="amicode-dev-tag"] {
+  color: var(--text-on-success-base);
+  background: color-mix(in srgb, var(--surface-success-strong) 16%, transparent);
+}
+
+/* ---- Developer Tools rebuild status + buttons ─────────────────────────── */
+.devtools-section-header {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.devtools-rebuild-status {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  font-size: 12px;
+  font-weight: 500;
+  font-family: var(--font-mono, monospace);
+}
+.devtools-rebuild-status--building { color: var(--text-warning-base, #ee9d2b); }
+.devtools-rebuild-status--done { color: var(--text-on-success-base, #2dba26); }
+.devtools-rebuild-status--failed { color: var(--text-danger-base, #e5484d); }
+
+.devtools-status-dot {
+  display: inline-block;
+  width: 8px;
+  height: 8px;
+  border-radius: 50%;
+}
+.devtools-status-dot--orange {
+  background: var(--surface-warning-strong, #ee9d2b);
+  animation: devtools-pulse 1.2s ease-in-out infinite;
+}
+.devtools-status-dot--green {
+  background: var(--surface-success-strong, #12c905);
+}
+.devtools-status-dot--red {
+  background: var(--surface-danger-strong, #e5484d);
+}
+
+@keyframes devtools-pulse {
+  0%, 100% { opacity: 1; }
+  50% { opacity: 0.4; }
+}
+
+ .devtools-rebuild-row {
+  display: flex;
+  gap: 8px;
+  padding: 16px 0 4px;
+}
+
 /* ─────────────────────────────────────────────────────────────────────────────
    APPROVAL CARD — [data-component="amicode-approval-card"] (approval-card.tsx)
    The capability-warrant card (spec-20260727-164748 §9.5). Sibling of the ask