diff --git a/.changeset/fn-8711-settings-credential-instance-contract.md b/.changeset/fn-8711-settings-credential-instance-contract.md
new file mode 100644
index 0000000000..e05dc8d060
--- /dev/null
+++ b/.changeset/fn-8711-settings-credential-instance-contract.md
@@ -0,0 +1,7 @@
+---
+"@runfusion/fusion": patch
+---
+
+summary: Keep named Authentication credential actions targeted to the selected account.
+category: fix
+dev: Settings omits default-instance arguments and preserves explicit credential instance ids for OAuth and API-key actions.
diff --git a/docs/settings-reference.md b/docs/settings-reference.md
index 52a296e2c0..87305739ba 100644
--- a/docs/settings-reference.md
+++ b/docs/settings-reference.md
@@ -1894,4 +1894,4 @@ already in progress continues on its existing session.
 
 ### Authentication credential instances
 
-Settings → Authentication can hold multiple named credential accounts for each non-CLI provider. Select **Add another account** to create a client-generated account id, optionally label it, and complete OAuth or save an API key; an abandoned pending account is not stored. The first credential becomes the provider default; later accounts do not change it. Operators can rename, remove, or make an existing account default. Labels are display-only, optional, and need not be unique. CLI-backed provider cards retain their own credential handling and do not support Fusion credential instances.
+Settings → Authentication can hold multiple named credential accounts for each non-CLI provider. Select **Add another account** to create a client-generated account id, optionally label it, and complete OAuth or save an API key; an abandoned pending account is not stored. The first credential becomes the provider default; later accounts do not change it. Authentication actions without a selected named account target that provider default, while actions on a named account retain its instance id through login, cancellation, logout, save, and clear. Operators can rename, remove, or make an existing account default. Labels are display-only, optional, and need not be unique. CLI-backed provider cards retain their own credential handling and do not support Fusion credential instances.
diff --git a/packages/dashboard/app/__tests__/settings-moved-keys.test.ts b/packages/dashboard/app/__tests__/settings-moved-keys.test.ts
index 03f8dc4127..7b93c4bbe9 100644
--- a/packages/dashboard/app/__tests__/settings-moved-keys.test.ts
+++ b/packages/dashboard/app/__tests__/settings-moved-keys.test.ts
@@ -47,6 +47,8 @@ const SURFACE_FILES = [
 const PRESET_NESTED_KEYS = new Set([
   "validatorProvider",
   "validatorModelId",
+  // FNXC:SettingsCredentialInstance 2026-08-01-17:06: Validator instance selection is valid only inside a model preset; the form-read guard remains active for its workflow-owned top-level setting.
+  "validatorCredentialInstanceId",
 ]);
 
 describe("SettingsModal moved-key removal sweep", () => {
diff --git a/packages/dashboard/app/components/SettingsModal.tsx b/packages/dashboard/app/components/SettingsModal.tsx
index 6c05240d40..8d32c0a3d6 100644
--- a/packages/dashboard/app/components/SettingsModal.tsx
+++ b/packages/dashboard/app/components/SettingsModal.tsx
@@ -2454,6 +2454,10 @@ export function SettingsModal({
     void copyTextToClipboard(copilotDeviceCode.userCode);
   }, [deviceCodes]);
 
+  /*
+  FNXC:SettingsCredentialInstance 2026-08-01-17:06:
+  Settings must omit the optional instance argument for a provider's default credential, while every explicit account id follows its OAuth or API-key action unchanged. This preserves the API's default-provider compatibility and prevents UI-local state from conflating default and named account flows.
+  */
   const handleLogin = useCallback(async (providerId: string, instanceId?: string, label?: string) => {
     const stateKey = formatProviderInstanceKey({ providerId, instanceId: instanceId ?? "default" });
     const provider = authProviders.find((entry) => entry.id === providerId);
@@ -2473,7 +2477,11 @@ export function SettingsModal({
     clearAuthLoginUiState(stateKey);
 
     try {
-      const { url, instructions, manualCode, deviceCode } = await loginProvider(providerId, instanceId, label);
+      const { url, instructions, manualCode, deviceCode } = instanceId === undefined
+        ? await loginProvider(providerId)
+        : label === undefined
+          ? await loginProvider(providerId, instanceId)
+          : await loginProvider(providerId, instanceId, label);
       if (instructions?.trim() && !(providerId === "github-copilot" && deviceCode)) {
         setLoginInstructions((prev) => ({ ...prev, [stateKey]: instructions }));
       }
@@ -2491,9 +2499,8 @@ export function SettingsModal({
       pollIntervalRef.current[stateKey] = setInterval(async () => {
         try {
           const { providers } = await fetchAuthStatus({ provider: providerId, instance: instanceId });
-          const visibleProviders = filterVisibleOnboardingAndSettingsProviders(providers);
-          setAuthProviders(visibleProviders);
-          const provider = visibleProviders.find((p) => p.id === providerId);
+          const provider = providers.find((candidate) => candidate.id === providerId
+            && (candidate.instanceId ?? "default") === (instanceId ?? "default"));
           if (provider?.authenticated) {
             if (pollIntervalRef.current[stateKey]) {
               clearInterval(pollIntervalRef.current[stateKey]);
@@ -2501,6 +2508,14 @@ export function SettingsModal({
             }
             setAuthActionInProgress((prev) => { const next = { ...prev }; delete next[stateKey]; return next; });
             clearAuthLoginUiState(stateKey);
+            /*
+            FNXC:SettingsCredentialInstance 2026-08-01-17:49:
+            A targeted OAuth poll reports only the requested account's instance rows. Do not
+            replace Authentication's full provider envelope with that scoped response: sibling
+            providers and named accounts must remain visible while the login finishes. Refresh
+            the unscoped status only after this requested instance is terminal.
+            */
+            await loadAuthStatus().catch(() => {});
             addToast(t("settings.auth.loginSuccessful", "Login successful"), "success");
             window.dispatchEvent(new CustomEvent(OAUTH_RELOGIN_SUCCESS_EVENT, { detail: { providerId } }));
             scrollSettingsToTop();
@@ -2544,7 +2559,9 @@ export function SettingsModal({
 
     setManualCodeSubmitInProgress(stateKey);
     try {
-      const result = await submitProviderManualCode(providerId, code, instanceId);
+      const result = instanceId === undefined
+        ? await submitProviderManualCode(providerId, code)
+        : await submitProviderManualCode(providerId, code, instanceId);
       if (result.submitted) {
         setManualCodeInputs((prev) => {
           if (!(stateKey in prev)) {
@@ -2570,7 +2587,11 @@ export function SettingsModal({
     setAuthActionInProgress((prev) => ({ ...prev, [stateKey]: true }));
     // Provider status is shared; do not optimistically clear a concurrent instance's login flag.
     try {
-      await cancelProviderLogin(providerId, instanceId);
+      if (instanceId === undefined) {
+        await cancelProviderLogin(providerId);
+      } else {
+        await cancelProviderLogin(providerId, instanceId);
+      }
       clearAuthLoginUiState(stateKey);
       await loadAuthStatus().catch(() => {});
       addToast(t("settings.auth.loginCancelled", "Login cancelled"), "success");
@@ -2590,7 +2611,11 @@ export function SettingsModal({
     const stateKey = formatProviderInstanceKey({ providerId, instanceId: instanceId ?? "default" });
     setAuthActionInProgress((prev) => ({ ...prev, [stateKey]: true }));
     try {
-      await logoutProvider(providerId, instanceId);
+      if (instanceId === undefined) {
+        await logoutProvider(providerId);
+      } else {
+        await logoutProvider(providerId, instanceId);
+      }
       await loadAuthStatus();
       addToast(t("settings.auth.loggedOut", "Logged out"), "success");
     } catch (err) {
@@ -2614,7 +2639,9 @@ export function SettingsModal({
       return next;
     });
     try {
-      const saveResult = await saveApiKey(providerId, key, instanceId, label);
+      const saveResult = instanceId === undefined
+        ? await saveApiKey(providerId, key)
+        : await saveApiKey(providerId, key, instanceId, label);
       setApiKeyInputs((prev) => {
         const next = { ...prev };
         delete next[stateKey];
@@ -2677,7 +2704,11 @@ export function SettingsModal({
     const stateKey = formatProviderInstanceKey({ providerId, instanceId: instanceId ?? "default" });
     setAuthActionInProgress((prev) => ({ ...prev, [stateKey]: true }));
     try {
-      await clearApiKey(providerId, instanceId);
+      if (instanceId === undefined) {
+        await clearApiKey(providerId);
+      } else {
+        await clearApiKey(providerId, instanceId);
+      }
       setApiKeyInputs((prev) => {
         const next = { ...prev };
         delete next[stateKey];
diff --git a/packages/dashboard/app/components/__tests__/SettingsModal.models-auth.test.tsx b/packages/dashboard/app/components/__tests__/SettingsModal.models-auth.test.tsx
index b8638be225..546ee8dcb7 100644
--- a/packages/dashboard/app/components/__tests__/SettingsModal.models-auth.test.tsx
+++ b/packages/dashboard/app/components/__tests__/SettingsModal.models-auth.test.tsx
@@ -1254,6 +1254,64 @@ describe("SettingsModal", () => {
       }
     });
 
+    it("preserves sibling providers and named accounts while polling a named OAuth login", async () => {
+      const openSpy = vi.spyOn(window, "open").mockImplementation(() => null);
+      mockFetchAuthStatus
+        .mockResolvedValueOnce({
+          providers: [
+            {
+              id: "anthropic-subscription",
+              name: "Anthropic Subscription",
+              authenticated: false,
+              type: "oauth",
+              instanceId: "work",
+              instances: [
+                { instanceId: "work", label: "Work", isDefault: true, authenticated: false, type: "oauth" },
+                { instanceId: "personal", label: "Personal", isDefault: false, authenticated: false, type: "oauth" },
+              ],
+            },
+            { id: "github", name: "GitHub", authenticated: false, type: "oauth" },
+          ],
+        })
+        .mockResolvedValueOnce({
+          providers: [
+            {
+              id: "anthropic-subscription",
+              name: "Anthropic Subscription",
+              authenticated: false,
+              type: "oauth",
+              instanceId: "work",
+              loginInProgress: true,
+              instances: [{ instanceId: "work", label: "Work", isDefault: true, authenticated: false, type: "oauth" }],
+            },
+          ],
+        });
+      mockLoginProvider.mockResolvedValueOnce({ url: "https://claude.ai/oauth/authorize" });
+
+      renderModal();
+      await waitForSettingsModalReady();
+      await settingsModalUser.click(screen.getByRole("button", { name: "Authentication" }));
+      vi.useFakeTimers();
+
+      try {
+        const instances = screen.getByTestId("auth-instances-anthropic-subscription");
+        fireEvent.click(within(instances).getAllByRole("button", { name: "Login" })[0]);
+
+        await act(async () => {
+          await Promise.resolve();
+          await vi.advanceTimersByTimeAsync(2000);
+        });
+
+        expect(mockLoginProvider).toHaveBeenCalledWith("anthropic-subscription", "work");
+        expect(mockFetchAuthStatus).toHaveBeenLastCalledWith({ provider: "anthropic-subscription", instance: "work" });
+        expect(openSpy).toHaveBeenCalledWith("https://claude.ai/oauth/authorize", "_blank");
+        expect(screen.getByText("Personal")).toBeInTheDocument();
+        expect(screen.getByTestId("auth-provider-icon-github")).toBeInTheDocument();
+      } finally {
+        vi.useRealTimers();
+      }
+    });
+
     it("shows incomplete toast when Anthropic Subscription OAuth stops without authentication", async () => {
       const openSpy = vi.spyOn(window, "open").mockImplementation(() => null);
       const addToast = vi.fn();
@@ -1559,6 +1617,26 @@ describe("SettingsModal", () => {
       expect(mockClearApiKey).toHaveBeenCalledWith("anthropic-api-key");
     });
 
+    it("routes named credential instances through their matching auth actions", async () => {
+      mockFetchAuthStatus.mockResolvedValue({
+        providers: [
+          { id: "anthropic-subscription", name: "Anthropic Subscription", authenticated: true, type: "oauth", instanceId: "work" },
+          { id: "anthropic-api-key", name: "Anthropic API Key", authenticated: true, type: "api_key", instanceId: "billing", keyHint: "sk-•••••work" },
+        ],
+      });
+
+      render(<SettingsModal onClose={noop} addToast={vi.fn()} />);
+      await settingsModalUser.click(await screen.findByRole("button", { name: "Authentication" }));
+
+      const subscriptionCard = screen.getByTestId("auth-provider-icon-anthropic-subscription").closest(".auth-provider-card") as HTMLElement;
+      const apiKeyCard = screen.getByTestId("auth-provider-icon-anthropic-api-key").closest(".auth-provider-card") as HTMLElement;
+      await settingsModalUser.click(within(subscriptionCard).getByRole("button", { name: "Logout" }));
+      await settingsModalUser.click(within(apiKeyCard).getByRole("button", { name: "Clear" }));
+
+      expect(mockLogoutProvider).toHaveBeenCalledWith("anthropic-subscription", "work");
+      expect(mockClearApiKey).toHaveBeenCalledWith("anthropic-api-key", "billing");
+    });
+
     it("scrolls settings content to top after API key save succeeds", async () => {
       mockFetchAuthStatus.mockResolvedValueOnce({
         providers: [{ id: "openai", name: "OpenAI", authenticated: false, type: "api_key" }],
diff --git a/packages/dashboard/app/components/__tests__/settings-mobile.test.tsx b/packages/dashboard/app/components/__tests__/settings-mobile.test.tsx
index 2fbc2ac8b0..bd9a502abc 100644
--- a/packages/dashboard/app/components/__tests__/settings-mobile.test.tsx
+++ b/packages/dashboard/app/components/__tests__/settings-mobile.test.tsx
@@ -54,7 +54,11 @@ vi.mock("../../api", () => ({
     { id: "anthropic-subscription", name: "Anthropic Subscription", authenticated: false, type: "oauth" },
     { id: "anthropic-api-key", name: "Anthropic API Key", authenticated: false, type: "api_key" },
   ] })),
+  // FNXC:SettingsCredentialInstance 2026-08-01-17:06: Mobile Authentication uses the same default-or-named instance key as desktop so responsive rendering cannot collapse provider action state.
+  formatProviderInstanceKey: ({ providerId, instanceId }: { providerId: string; instanceId: string }) => instanceId === "default" ? providerId : `${providerId}[${instanceId}]`,
   loginProvider: vi.fn(() => Promise.resolve({ url: "https://auth.example.com/login" })),
+  submitProviderManualCode: vi.fn(() => Promise.resolve({ success: true, submitted: true })),
+  cancelProviderLogin: vi.fn(() => Promise.resolve({ success: true, cancelled: true })),
   logoutProvider: vi.fn(() => Promise.resolve({ success: true })),
   saveApiKey: vi.fn(() => Promise.resolve({ success: true })),
   clearApiKey: vi.fn(() => Promise.resolve({ success: true })),
@@ -155,7 +159,7 @@ vi.mock("../../hooks/useMemoryBackendStatus", () => ({
   })),
 }));
 
-import { fetchDashboardHealth, fetchSettings, updateSettings } from "../../api";
+import { fetchDashboardHealth, fetchSettings, loginProvider, saveApiKey, updateSettings } from "../../api";
 
 function setDocumentHidden(hidden: boolean): void {
   Object.defineProperty(document, "hidden", { configurable: true, value: hidden });
@@ -724,10 +728,12 @@ describe("SettingsModal mobile adaptations", () => {
 
     const subscriptionCard = (await findByTestId("auth-provider-icon-anthropic-subscription")).closest(".auth-provider-card") as HTMLElement;
     const apiKeyCard = (await findByTestId("auth-provider-icon-anthropic-api-key")).closest(".auth-provider-card") as HTMLElement;
-    expect(within(subscriptionCard).getByRole("button", { name: "Login" })).toBeTruthy();
+    await user.click(within(subscriptionCard).getByRole("button", { name: "Login" }));
+    expect(loginProvider).toHaveBeenCalledWith("anthropic-subscription");
     expect(within(subscriptionCard).queryByPlaceholderText("Enter API key")).toBeNull();
-    expect(within(apiKeyCard).getByPlaceholderText("Enter API key")).toBeTruthy();
-    expect(within(apiKeyCard).getByRole("button", { name: "Save" })).toBeTruthy();
+    await user.type(within(apiKeyCard).getByPlaceholderText("Enter API key"), "sk-mobile");
+    await user.click(within(apiKeyCard).getByRole("button", { name: "Save" }));
+    expect(saveApiKey).toHaveBeenCalledWith("anthropic-api-key", "sk-mobile");
   });
 
   it("renders notification provider cards responsively on mobile", async () => {
diff --git a/packages/dashboard/app/components/settings/sections/AuthenticationSection.tsx b/packages/dashboard/app/components/settings/sections/AuthenticationSection.tsx
index 0b05d64a5b..d569204f1b 100644
--- a/packages/dashboard/app/components/settings/sections/AuthenticationSection.tsx
+++ b/packages/dashboard/app/components/settings/sections/AuthenticationSection.tsx
@@ -276,7 +276,7 @@ export function AuthenticationSection({ auth, form, setForm }: AuthenticationSec
       return <div className="auth-apikey-section">
         <div className="auth-apikey-input-row">
           <input type="password" className="auth-apikey-input" placeholder={t("settings.authentication.enterAPIKey", "Enter API key")} value={apiKeyInputs[stateKey] ?? ""} onChange={(e) => setApiKeyInputs((prev) => ({ ...prev, [stateKey]: e.target.value }))} disabled={isAuthActionActive(stateKey)}/>
-          {provider.keyHint && !isPending && !apiKeyInputs[stateKey] ? <button className="btn btn-sm" onClick={() => selectedInstanceId ? handleClearApiKey(provider.id, selectedInstanceId) : handleClearApiKey(provider.id)} disabled={isAuthActionActive(stateKey)}>{t("settings.auth.clearKey", "Clear")}</button> : <button className="btn btn-primary btn-sm" onClick={() => selectedInstanceId ? handleSaveApiKey(provider.id, selectedInstanceId, pendingLabel || undefined) : handleSaveApiKey(provider.id)} disabled={isAuthActionActive(stateKey)}>{t("settings.actions.save", "Save")}</button>}
+          {provider.keyHint && !isPending && !apiKeyInputs[stateKey] ? <button className="btn btn-sm" onClick={() => instanceId ? handleClearApiKey(provider.id, instanceId) : handleClearApiKey(provider.id)} disabled={isAuthActionActive(stateKey)}>{t("settings.auth.clearKey", "Clear")}</button> : <button className="btn btn-primary btn-sm" onClick={() => instanceId ? handleSaveApiKey(provider.id, instanceId, pendingLabel || undefined) : handleSaveApiKey(provider.id)} disabled={isAuthActionActive(stateKey)}>{t("settings.actions.save", "Save")}</button>}
         </div>
         {isAuthActionActive(stateKey) && <small className="auth-apikey-progress">{t("settings.auth.savingKey", "Saving…")}</small>}
         {apiKeyErrors[stateKey] && <small className="auth-apikey-error">{apiKeyErrors[stateKey]}</small>}
@@ -284,11 +284,12 @@ export function AuthenticationSection({ auth, form, setForm }: AuthenticationSec
       </div>;
     };
     const renderAuthenticatedOAuthActions = (provider: AuthProvider, selectedInstanceId?: string) => {
-      const stateKey = formatProviderInstanceKey({ providerId: provider.id, instanceId: selectedInstanceId ?? provider.instanceId ?? "default" });
+      const instanceId = selectedInstanceId ?? provider.instanceId;
+      const stateKey = formatProviderInstanceKey({ providerId: provider.id, instanceId: instanceId ?? "default" });
       return <div>
         {isAuthActionActive(stateKey) ? <button className="btn btn-sm" disabled>{t("settings.auth.loggingOut", "Logging out…")}</button>
-          : provider.loginInProgress ? <div className="auth-provider-actions-row"><button className="btn btn-sm" disabled>{t("settings.auth.waitingForLogin", "Waiting for login…")}</button><button className="btn btn-sm" onClick={() => selectedInstanceId ? handleCancelLogin(provider.id, selectedInstanceId) : handleCancelLogin(provider.id)}>{t("settings.actions.cancel", "Cancel")}</button></div>
-            : <button className="btn btn-sm" onClick={() => selectedInstanceId ? handleLogout(provider.id, selectedInstanceId) : handleLogout(provider.id)}>{t("settings.auth.logout", "Logout")}</button>}
+          : provider.loginInProgress ? <div className="auth-provider-actions-row"><button className="btn btn-sm" disabled>{t("settings.auth.waitingForLogin", "Waiting for login…")}</button><button className="btn btn-sm" onClick={() => instanceId ? handleCancelLogin(provider.id, instanceId) : handleCancelLogin(provider.id)}>{t("settings.actions.cancel", "Cancel")}</button></div>
+            : <button className="btn btn-sm" onClick={() => instanceId ? handleLogout(provider.id, instanceId) : handleLogout(provider.id)}>{t("settings.auth.logout", "Logout")}</button>}
       </div>;
     };
     const renderAvailableOAuthActions = (provider: AuthProvider, selectedInstanceId?: string, pendingLabel?: string) => {
@@ -296,9 +297,9 @@ export function AuthenticationSection({ auth, form, setForm }: AuthenticationSec
       const stateKey = formatProviderInstanceKey({ providerId: provider.id, instanceId: instanceId ?? "default" });
       const isActive = provider.loginInProgress || isAuthActionActive(stateKey);
       return <div>
-        {isAuthActionActive(stateKey) ? <div className="auth-provider-actions-row"><button className="btn btn-sm" disabled>{t("settings.auth.waitingForLogin", "Waiting for login…")}</button><button className="btn btn-sm" onClick={() => handleCancelLogin(provider.id, selectedInstanceId)}>{t("settings.actions.cancel", "Cancel")}</button></div>
-          : provider.loginInProgress ? <div className="auth-provider-actions-row"><button className="btn btn-sm" disabled>{t("settings.auth.waitingForLogin", "Waiting for login…")}</button><button className="btn btn-sm" onClick={() => selectedInstanceId ? handleCancelLogin(provider.id, selectedInstanceId) : handleCancelLogin(provider.id)}>{t("settings.actions.cancel", "Cancel")}</button></div>
-            : <button className="btn btn-primary btn-sm" onClick={() => selectedInstanceId ? handleLogin(provider.id, selectedInstanceId, pendingLabel) : handleLogin(provider.id)}>{t("settings.auth.login", "Login")}</button>}
+        {isAuthActionActive(stateKey) ? <div className="auth-provider-actions-row"><button className="btn btn-sm" disabled>{t("settings.auth.waitingForLogin", "Waiting for login…")}</button><button className="btn btn-sm" onClick={() => instanceId ? handleCancelLogin(provider.id, instanceId) : handleCancelLogin(provider.id)}>{t("settings.actions.cancel", "Cancel")}</button></div>
+          : provider.loginInProgress ? <div className="auth-provider-actions-row"><button className="btn btn-sm" disabled>{t("settings.auth.waitingForLogin", "Waiting for login…")}</button><button className="btn btn-sm" onClick={() => instanceId ? handleCancelLogin(provider.id, instanceId) : handleCancelLogin(provider.id)}>{t("settings.actions.cancel", "Cancel")}</button></div>
+            : <button className="btn btn-primary btn-sm" onClick={() => instanceId ? handleLogin(provider.id, instanceId, pendingLabel) : handleLogin(provider.id)}>{t("settings.auth.login", "Login")}</button>}
         {provider.id === "github-copilot" && deviceCodes[stateKey] && isActive && <div className="auth-device-code-panel" data-testid={`auth-device-code-${stateKey}`}>
           <strong>{t("settings.auth.enterCodeOnGitHub", "Enter this code on GitHub")}</strong>
           <div className="auth-device-code-pill">{deviceCodes[stateKey].userCode}</div>
diff --git a/packages/dashboard/app/components/settings/sections/__tests__/settings-default-descriptions.test.tsx b/packages/dashboard/app/components/settings/sections/__tests__/settings-default-descriptions.test.tsx
index 2359367ec9..8d766957b8 100644
--- a/packages/dashboard/app/components/settings/sections/__tests__/settings-default-descriptions.test.tsx
+++ b/packages/dashboard/app/components/settings/sections/__tests__/settings-default-descriptions.test.tsx
@@ -365,6 +365,25 @@ const NOT_SURFACED_ALLOWLIST: Record<string, string> = {
   validatorFallbackProvider: "moved to workflow settings (U4)",
   validatorFallbackModelId: "moved to workflow settings (U4)",
 
+  /*
+  FNXC:SettingsCredentialInstance 2026-08-01-17:06:
+  Credential-instance selectors are inline companions to their provider/model pickers. They inherit the provider default when unset, so each has no standalone Settings description while this narrow inventory keeps the default-description census complete.
+  */
+  defaultCredentialInstanceId: "inline companion for the global default model picker; unset inherits the provider default",
+  fallbackCredentialInstanceId: "inline companion for the global fallback model picker; unset inherits the provider default",
+  executionGlobalCredentialInstanceId: "inline companion for the global execution model picker; unset inherits the provider default",
+  planningGlobalCredentialInstanceId: "inline companion for the global planning model picker; unset inherits the provider default",
+  validatorGlobalCredentialInstanceId: "inline companion for the global validator model picker; unset inherits the provider default",
+  titleSummarizerGlobalCredentialInstanceId: "inline companion for the global title-summarizer model picker; unset inherits the provider default",
+  mergerGlobalCredentialInstanceId: "inline companion for the global merger model picker; unset inherits the provider default",
+  importTranslateGlobalCredentialInstanceId: "inline companion for the global import-translate model picker; unset inherits the provider default",
+  defaultCredentialInstanceIdOverride: "inline companion for the project default model picker; unset inherits the provider default",
+  titleSummarizerCredentialInstanceId: "inline companion for the project title-summarizer model picker; unset inherits the provider default",
+  titleSummarizerFallbackCredentialInstanceId: "inline companion for the project title-summarizer fallback model picker; unset inherits the provider default",
+  importTranslateCredentialInstanceId: "inline companion for the project import-translate model picker; unset inherits the provider default",
+  mergerCredentialInstanceId: "inline companion for the project merger model picker; unset inherits the provider default",
+  mergerFallbackCredentialInstanceId: "inline companion for the project merger fallback model picker; unset inherits the provider default",
+
   // Internal/engine bookkeeping, session state, or reliability telemetry — not
   // rendered as a plain user-facing description field anywhere in Settings.
   globalPause: "engine-managed pause flag, not a plain description field",