diff --git a/api/server/controllers/agents/__tests__/request.resumeMetadata.spec.js b/api/server/controllers/agents/__tests__/request.resumeMetadata.spec.js
index eda065cdf4..ceb1abb3ac 100644
--- a/api/server/controllers/agents/__tests__/request.resumeMetadata.spec.js
+++ b/api/server/controllers/agents/__tests__/request.resumeMetadata.spec.js
@@ -1817,6 +1817,43 @@ describe('ResumableAgentController resume metadata', () => {
     );
   });
 
+  it('preserves a stateful scope policy denial in the durable initialization error', async () => {
+    const policyError = Object.assign(
+      new Error('Stateful code environment is not allowed by this deployment: conversation'),
+      {
+        code: ErrorTypes.STATEFUL_CODE_ENVIRONMENT_NOT_ALLOWED,
+        status: 403,
+        statusCode: 403,
+      },
+    );
+    const initializeClient = jest.fn().mockRejectedValue(policyError);
+    const req = {
+      user: { id: 'user-123' },
+      body: {
+        text: 'Run code.',
+        messageId: 'user-msg',
+        clientRequestId: 'req-abc',
+        conversationId: 'conversation-123',
+        endpointOption: { endpoint: 'agents', modelOptions: { model: 'gpt-4.1' } },
+      },
+      config: {},
+    };
+    const res = createResumableResponse();
+
+    await AgentController(req, res, jest.fn(), initializeClient, null);
+
+    expect(res.status).toHaveBeenCalledWith(200);
+    expect(mockGenerationJobManager.completeJob).toHaveBeenCalledWith(
+      'conversation-123',
+      JSON.stringify({
+        status: 403,
+        code: ErrorTypes.STATEFUL_CODE_ENVIRONMENT_NOT_ALLOWED,
+        error: 'Stateful code environment is not allowed by this deployment: conversation',
+      }),
+      1000,
+    );
+  });
+
   it('returns a recovery conflict when the atomic store rejects changed source content', async () => {
     const mismatch = new Error('recovery mismatch');
     mismatch.code = 'RECOVERY_PAYLOAD_MISMATCH';
diff --git a/api/server/controllers/agents/request.js b/api/server/controllers/agents/request.js
index 2dbe305609..ce1bdf5db9 100644
--- a/api/server/controllers/agents/request.js
+++ b/api/server/controllers/agents/request.js
@@ -50,15 +50,23 @@ function sendGenerationJson(res, status, body, generationProtocolVersion) {
   return res.status(status).json({ ...body, generationProtocolVersion });
 }
 
-function getResourceRecoveryFailure(error) {
-  if (error?.code !== ErrorTypes.RESOURCE_RECOVERY_REQUIRED) {
-    return null;
+function getInitializationFailure(error) {
+  if (error?.code === ErrorTypes.RESOURCE_RECOVERY_REQUIRED) {
+    return {
+      status: 409,
+      code: ErrorTypes.RESOURCE_RECOVERY_REQUIRED,
+      error: error.message || 'Attached resources must be restored before retrying.',
+    };
   }
 
+  const candidateStatus = error?.status ?? error?.statusCode;
+  if (!Number.isInteger(candidateStatus) || candidateStatus < 400 || candidateStatus >= 600) {
+    return null;
+  }
   return {
-    status: 409,
-    code: ErrorTypes.RESOURCE_RECOVERY_REQUIRED,
-    error: error.message || 'Attached resources must be restored before retrying.',
+    status: candidateStatus,
+    ...(typeof error?.code === 'string' ? { code: error.code } : {}),
+    error: error?.message || 'Failed to start generation',
   };
 }
 
@@ -1831,7 +1839,7 @@ const ResumableAgentController = async (req, res, next, initializeClient, addTit
     });
   } catch (error) {
     logger.error('[ResumableAgentController] Initialization error:', error);
-    const resourceRecoveryFailure = getResourceRecoveryFailure(error);
+    const initializationFailure = getInitializationFailure(error);
     try {
       if (!res.headersSent) {
         if (error?.code === 'GENERATION_PREDECESSOR_MISMATCH') {
@@ -1872,11 +1880,11 @@ const ResumableAgentController = async (req, res, next, initializeClient, addTit
             },
             generationProtocolVersion,
           );
-        } else if (resourceRecoveryFailure) {
+        } else if (initializationFailure) {
           sendGenerationJson(
             res,
-            resourceRecoveryFailure.status,
-            resourceRecoveryFailure,
+            initializationFailure.status,
+            initializationFailure,
             generationProtocolVersion,
           );
         } else {
@@ -1907,8 +1915,8 @@ const ResumableAgentController = async (req, res, next, initializeClient, addTit
     // and the concurrency slot leaks — so swallow its error. (A failed completeJob did not
     // finalize anything, so releasing afterward can't let it abort a later replacement.)
     if (jobCreatedAt != null) {
-      const initializationError = resourceRecoveryFailure
-        ? JSON.stringify(resourceRecoveryFailure)
+      const initializationError = initializationFailure
+        ? JSON.stringify(initializationFailure)
         : error.message || 'Failed to start generation';
       await GenerationJobManager.completeJob(streamId, initializationError, jobCreatedAt).catch(
         (completeErr) => {
diff --git a/api/server/controllers/agents/v1.js b/api/server/controllers/agents/v1.js
index 3f6b4c5f53..6fc7450d61 100644
--- a/api/server/controllers/agents/v1.js
+++ b/api/server/controllers/agents/v1.js
@@ -35,6 +35,7 @@ const {
   actionDelimiter,
   AgentCapabilities,
   EModelEndpoint,
+  resolveAllowedStatefulCodeEnvironments,
   removeNullishValues,
 } = require('librechat-data-provider');
 const {
@@ -201,6 +202,28 @@ const isSubagentsCapabilityEnabled = (req) => {
   return capabilities.includes(AgentCapabilities.subagents);
 };
 
+/** Reject a newly selected stateful workspace scope that the deployment owner
+ * has excluded. Disabled sessions and unrelated edits remain saveable so an
+ * allowlist tightening never silently rewrites or strands an existing agent. */
+const validateStatefulCodeEnvironment = (req, res, enabled, environment) => {
+  if (enabled !== true) {
+    return true;
+  }
+
+  const allowedEnvironments = resolveAllowedStatefulCodeEnvironments(
+    req.config?.endpoints?.[EModelEndpoint.agents]?.statefulCodeSessions?.allowedEnvironments,
+  );
+  const resolvedEnvironment = environment ?? 'user';
+  if (allowedEnvironments.includes(resolvedEnvironment)) {
+    return true;
+  }
+
+  res.status(403).json({
+    error: `Stateful code environment is not allowed by this deployment: ${resolvedEnvironment}`,
+  });
+  return false;
+};
+
 /**
  * Filters tools to only include those the user is authorized to use.
  * MCP tools must match the exact format `{toolName}_mcp_{serverName}` (exactly 2 segments).
@@ -400,6 +423,17 @@ const createAgentHandler = async (req, res) => {
     const validatedData = agentCreateSchema.parse(req.body);
     const { tools = [], ...agentData } = removeNullishValues(validatedData);
 
+    if (
+      !validateStatefulCodeEnvironment(
+        req,
+        res,
+        agentData.stateful_code_sessions,
+        agentData.stateful_code_environment,
+      )
+    ) {
+      return;
+    }
+
     if (agentData.model_parameters && typeof agentData.model_parameters === 'object') {
       agentData.model_parameters = removeNullishValues(
         sanitizeModelParameters(agentData.model_parameters),
@@ -678,6 +712,46 @@ const updateAgentHandler = async (req, res) => {
     // Preserve explicit null for avatar to allow resetting the avatar
     const { avatar: avatarField, _id, ...rest } = validatedData;
     const updateData = removeNullishValues(rest);
+    let existingAgent;
+
+    const includesStatefulConfiguration =
+      updateData.stateful_code_sessions !== undefined ||
+      updateData.stateful_code_environment !== undefined;
+    const includesToolsConfiguration = Array.isArray(updateData.tools);
+    if (includesStatefulConfiguration || includesToolsConfiguration) {
+      existingAgent = await db.getAgent({ id });
+      if (!existingAgent) {
+        return res.status(404).json({ error: 'Agent not found' });
+      }
+
+      const statefulConfigurationChanged =
+        (updateData.stateful_code_sessions !== undefined &&
+          (updateData.stateful_code_sessions === true) !==
+            (existingAgent.stateful_code_sessions === true)) ||
+        (updateData.stateful_code_environment !== undefined &&
+          (updateData.stateful_code_environment ?? 'user') !==
+            (existingAgent.stateful_code_environment ?? 'user'));
+      const activatesCodeExecution =
+        includesToolsConfiguration &&
+        updateData.tools.includes(Tools.execute_code) &&
+        existingAgent.tools?.includes(Tools.execute_code) !== true;
+      if (statefulConfigurationChanged || activatesCodeExecution) {
+        const effectiveStatefulSessions =
+          updateData.stateful_code_sessions ?? existingAgent.stateful_code_sessions;
+        const effectiveStatefulEnvironment =
+          updateData.stateful_code_environment ?? existingAgent.stateful_code_environment;
+        if (
+          !validateStatefulCodeEnvironment(
+            req,
+            res,
+            effectiveStatefulSessions,
+            effectiveStatefulEnvironment,
+          )
+        ) {
+          return;
+        }
+      }
+    }
 
     if (updateData.model_parameters && typeof updateData.model_parameters === 'object') {
       updateData.model_parameters = removeNullishValues(
@@ -750,7 +824,7 @@ const updateAgentHandler = async (req, res) => {
     // Convert OCR to context in incoming updateData
     convertOcrToContextInPlace(updateData);
 
-    const existingAgent = await db.getAgent({ id });
+    existingAgent ??= await db.getAgent({ id });
 
     if (!existingAgent) {
       return res.status(404).json({ error: 'Agent not found' });
@@ -964,6 +1038,16 @@ const duplicateAgentHandler = async (req, res) => {
       id: newAgentId,
       author: userId,
     });
+    if (
+      !validateStatefulCodeEnvironment(
+        req,
+        res,
+        newAgentData.stateful_code_sessions,
+        newAgentData.stateful_code_environment,
+      )
+    ) {
+      return;
+    }
     newAgentData.edges = replaceEdgeSourceId(newAgentData.edges, id, newAgentId);
     newAgentData.edges = replaceEdgeSourceId(newAgentData.edges, '', newAgentId);
 
@@ -1498,6 +1582,17 @@ const revertAgentVersionHandler = async (req, res) => {
     }
 
     const revertVersion = existingAgent.versions?.[version_index];
+    if (
+      revertVersion &&
+      !validateStatefulCodeEnvironment(
+        req,
+        res,
+        revertVersion.stateful_code_sessions,
+        revertVersion.stateful_code_environment,
+      )
+    ) {
+      return;
+    }
     const storedRevertEdges = Array.isArray(revertVersion?.edges) ? revertVersion.edges : [];
     const revertEdges = replaceEdgeSourceId(storedRevertEdges, '', id);
     const hasLegacyEdgeSource = storedRevertEdges.some((edge) =>
diff --git a/api/server/controllers/agents/v1.spec.js b/api/server/controllers/agents/v1.spec.js
index 67000ea4b3..cec5412f69 100644
--- a/api/server/controllers/agents/v1.spec.js
+++ b/api/server/controllers/agents/v1.spec.js
@@ -3,6 +3,7 @@ const { nanoid } = require('nanoid');
 const { v4: uuidv4 } = require('uuid');
 const { agentSchema, aclEntrySchema, fileSchema, userSchema } = require('@librechat/data-schemas');
 const {
+  Tools,
   FileSources,
   PermissionBits,
   PrincipalModel,
@@ -181,6 +182,28 @@ describe('Agent Controllers - Mass Assignment Protection', () => {
   });
 
   describe('createAgentHandler', () => {
+    test('rejects a stateful environment excluded by deployment policy', async () => {
+      mockReq.config = {
+        endpoints: {
+          agents: {
+            statefulCodeSessions: { allowedEnvironments: ['user'] },
+          },
+        },
+      };
+      mockReq.body = {
+        name: 'Disallowed Stateful Agent',
+        provider: 'openai',
+        model: 'gpt-4',
+        stateful_code_sessions: true,
+        stateful_code_environment: 'conversation',
+      };
+
+      await createAgentHandler(mockReq, mockRes);
+
+      expect(mockRes.status).toHaveBeenCalledWith(403);
+      expect(await Agent.countDocuments()).toBe(0);
+    });
+
     test('should create agent with allowed fields only', async () => {
       const validData = {
         name: 'Test Agent',
@@ -801,6 +824,83 @@ describe('Agent Controllers - Mass Assignment Protection', () => {
       expect(agentInDb.name).toBe('Updated Agent');
     });
 
+    test('rejects selecting a stateful environment excluded by deployment policy', async () => {
+      mockReq.user.id = existingAgentAuthorId.toString();
+      mockReq.params.id = existingAgentId;
+      mockReq.config = {
+        endpoints: {
+          agents: {
+            statefulCodeSessions: { allowedEnvironments: ['user'] },
+          },
+        },
+      };
+      mockReq.body = {
+        stateful_code_sessions: true,
+        stateful_code_environment: 'conversation',
+      };
+
+      await updateAgentHandler(mockReq, mockRes);
+
+      expect(mockRes.status).toHaveBeenCalledWith(403);
+      const agentInDb = await Agent.findOne({ id: existingAgentId });
+      expect(agentInDb.stateful_code_sessions).not.toBe(true);
+    });
+
+    test('allows unrelated edits to an existing scope after policy is tightened', async () => {
+      await Agent.updateOne(
+        { id: existingAgentId },
+        { stateful_code_sessions: true, stateful_code_environment: 'conversation' },
+      );
+      mockReq.user.id = existingAgentAuthorId.toString();
+      mockReq.params.id = existingAgentId;
+      mockReq.config = {
+        endpoints: {
+          agents: {
+            statefulCodeSessions: { allowedEnvironments: ['user'] },
+          },
+        },
+      };
+      mockReq.body = {
+        name: 'Still editable',
+        stateful_code_sessions: true,
+        stateful_code_environment: 'conversation',
+      };
+
+      await updateAgentHandler(mockReq, mockRes);
+
+      expect(mockRes.status).not.toHaveBeenCalledWith(403);
+      const agentInDb = await Agent.findOne({ id: existingAgentId });
+      expect(agentInDb.name).toBe('Still editable');
+      expect(agentInDb.stateful_code_environment).toBe('conversation');
+    });
+
+    test('rejects reactivating code execution with a retained disallowed scope', async () => {
+      await Agent.updateOne(
+        { id: existingAgentId },
+        {
+          tools: [],
+          stateful_code_sessions: true,
+          stateful_code_environment: 'conversation',
+        },
+      );
+      mockReq.user.id = existingAgentAuthorId.toString();
+      mockReq.params.id = existingAgentId;
+      mockReq.config = {
+        endpoints: {
+          agents: {
+            statefulCodeSessions: { allowedEnvironments: ['user'] },
+          },
+        },
+      };
+      mockReq.body = { tools: [Tools.execute_code] };
+
+      await updateAgentHandler(mockReq, mockRes);
+
+      expect(mockRes.status).toHaveBeenCalledWith(403);
+      const agentInDb = await Agent.findOne({ id: existingAgentId });
+      expect(agentInDb.tools).not.toContain(Tools.execute_code);
+    });
+
     test('should sanitize corrupt numeric model_parameters on update', async () => {
       mockReq.user.id = existingAgentAuthorId.toString();
       mockReq.params.id = existingAgentId;
diff --git a/api/server/routes/agents/v1.js b/api/server/routes/agents/v1.js
index 233839dcf4..6812dde46c 100644
--- a/api/server/routes/agents/v1.js
+++ b/api/server/routes/agents/v1.js
@@ -46,7 +46,7 @@ router.get('/categories', v1.getAgentCategories);
  * @param {AgentCreateParams} req.body - The agent creation parameters.
  * @returns {Agent} 201 - Success response - application/json
  */
-router.post('/', checkAgentCreate, v1.createAgent);
+router.post('/', checkAgentCreate, configMiddleware, v1.createAgent);
 
 /**
  * Retrieves basic agent information (VIEW permission required).
@@ -108,6 +108,7 @@ router.get(
 router.patch(
   '/:id',
   checkAgentCreate,
+  configMiddleware,
   canAccessAgentResource({
     requiredPermission: PermissionBits.EDIT,
     resourceIdParam: 'id',
@@ -124,6 +125,7 @@ router.patch(
 router.post(
   '/:id/duplicate',
   checkAgentCreate,
+  configMiddleware,
   canAccessAgentResource({
     requiredPermission: PermissionBits.EDIT,
     resourceIdParam: 'id',
@@ -157,6 +159,7 @@ router.delete(
 router.post(
   '/:id/revert',
   checkAgentCreate,
+  configMiddleware,
   canAccessAgentResource({
     requiredPermission: PermissionBits.EDIT,
     resourceIdParam: 'id',
diff --git a/api/server/routes/user.js b/api/server/routes/user.js
index 90f247cd36..4107e410c7 100644
--- a/api/server/routes/user.js
+++ b/api/server/routes/user.js
@@ -28,7 +28,7 @@ const updateUserPreferences = createUserPreferencesHandler({
 
 router.use('/settings', settings);
 router.get('/', requireJwtAuth, getUserController);
-router.patch('/preferences', requireJwtAuth, updateUserPreferences);
+router.patch('/preferences', requireJwtAuth, configMiddleware, updateUserPreferences);
 router.get('/terms', requireJwtAuth, getTermsStatusController);
 router.post('/terms/accept', requireJwtAuth, acceptTermsController);
 router.post('/plugins', requireJwtAuth, updateUserPluginsController);
diff --git a/api/server/services/Endpoints/agents/initialize.js b/api/server/services/Endpoints/agents/initialize.js
index a75683a4b8..5110a8b7bd 100644
--- a/api/server/services/Endpoints/agents/initialize.js
+++ b/api/server/services/Endpoints/agents/initialize.js
@@ -20,6 +20,7 @@ const {
   buildAgentContextAttachmentsByAgentId,
   collectCodeExecutionProfileRoutes,
   getLazySubagentConfigId,
+  createStatefulCodeEnvironmentPolicyError,
 } = require('@librechat/api');
 const {
   Permissions,
@@ -34,6 +35,7 @@ const {
   MAX_SUBAGENT_GRAPH_NODES,
   MAX_SUBAGENT_RUN_CONFIGS,
   isEphemeralAgentId,
+  resolveAllowedStatefulCodeEnvironments,
 } = require('librechat-data-provider');
 const {
   createToolEndCallback,
@@ -194,6 +196,9 @@ const initializeClient = async ({
   const statefulSessionsAvailable = enabledCapabilities.has(
     AgentCapabilities.stateful_code_sessions,
   );
+  const allowedStatefulCodeEnvironments = resolveAllowedStatefulCodeEnvironments(
+    appConfig?.endpoints?.[EModelEndpoint.agents]?.statefulCodeSessions?.allowedEnvironments,
+  );
   const ephemeralSkillsToggle = req.body?.ephemeralAgent?.skills === true;
   const skillDbMethods = getSkillDbMethods();
 
@@ -807,26 +812,36 @@ const initializeClient = async ({
       ),
     );
 
-  const toLazySubagentMetadata = (agent) => ({
-    id: agent.id,
-    name: agent.name,
-    description: agent.description,
-    provider: agent.provider,
-    model: agent.model,
-    model_parameters: { model: agent.model_parameters?.model },
-    recursion_limit: agent.recursion_limit,
-    subagents: agent.subagents,
-    configId: getLazySubagentConfigId(agent),
-    codeEnvAvailable:
-      codeEnvAvailable === true && agent.tools?.includes(Tools.execute_code) === true,
-    statefulCodeSessions:
+  const toLazySubagentMetadata = (agent) => {
+    const statefulCodeSessions =
       statefulSessionsAvailable === true &&
       codeEnvAvailable === true &&
       agent.stateful_code_sessions === true &&
-      agent.tools?.includes(Tools.execute_code) === true,
-    statefulCodeEnvironment: agent.stateful_code_environment,
-    includeReasoningHistory: getIncludeReasoningHistory(agent),
-  });
+      agent.tools?.includes(Tools.execute_code) === true;
+    const statefulCodeEnvironment = agent.stateful_code_environment ?? 'user';
+    if (
+      statefulCodeSessions &&
+      !allowedStatefulCodeEnvironments.includes(statefulCodeEnvironment)
+    ) {
+      throw createStatefulCodeEnvironmentPolicyError(statefulCodeEnvironment);
+    }
+    return {
+      id: agent.id,
+      name: agent.name,
+      description: agent.description,
+      provider: agent.provider,
+      model: agent.model,
+      model_parameters: { model: agent.model_parameters?.model },
+      recursion_limit: agent.recursion_limit,
+      subagents: agent.subagents,
+      configId: getLazySubagentConfigId(agent),
+      codeEnvAvailable:
+        codeEnvAvailable === true && agent.tools?.includes(Tools.execute_code) === true,
+      statefulCodeSessions,
+      statefulCodeEnvironment,
+      includeReasoningHistory: getIncludeReasoningHistory(agent),
+    };
+  };
 
   const loadSubagentMetadata = async (agentId) => {
     if (skippedAgentIds.has(agentId)) return null;
diff --git a/api/server/services/Endpoints/agents/initialize.spec.js b/api/server/services/Endpoints/agents/initialize.spec.js
index a8ff3840f1..2152892fe8 100644
--- a/api/server/services/Endpoints/agents/initialize.spec.js
+++ b/api/server/services/Endpoints/agents/initialize.spec.js
@@ -62,7 +62,11 @@ jest.mock('~/server/services/ToolService', () => ({
   loadAgentTools: jest.fn(),
   loadToolsForExecution: (...args) => mockLoadToolsForExecution(...args),
   isFatalAgentInitializationError: (error) =>
-    ['AGENT_EXPECTED_MCP_TOOLS_UNAVAILABLE', 'resource_recovery_required'].includes(error?.code),
+    [
+      'AGENT_EXPECTED_MCP_TOOLS_UNAVAILABLE',
+      'resource_recovery_required',
+      'stateful_code_environment_not_allowed',
+    ].includes(error?.code),
 }));
 
 jest.mock('~/server/controllers/ModelController', () => ({
@@ -859,6 +863,42 @@ describe('initializeClient — subagent loading', () => {
     expect(agentClientArgs.agentConfigs.has(SUBAGENT_ID)).toBe(false);
   });
 
+  it('rejects a disallowed lazy subagent scope before exposing it for prewarm', async () => {
+    const subAgent = await createAgent({
+      id: SUBAGENT_ID,
+      name: 'Disallowed Stateful Subagent',
+      provider: 'openai',
+      model: 'gpt-4',
+      author: new mongoose.Types.ObjectId(),
+      tools: ['execute_code'],
+      stateful_code_sessions: true,
+      stateful_code_environment: 'conversation',
+    });
+    await grantView(subAgent);
+    mockInitializeAgent.mockResolvedValue(
+      makePrimaryConfig({
+        subagents: { enabled: true, allowSelf: false, agent_ids: [SUBAGENT_ID] },
+      }),
+    );
+    const req = makeSubagentReq();
+    req.config.endpoints.agents.capabilities.push('execute_code', 'stateful_code_sessions');
+    req.config.endpoints.agents.statefulCodeSessions = { allowedEnvironments: ['user'] };
+
+    await expect(
+      initializeClient({
+        req,
+        res: {},
+        signal: new AbortController().signal,
+        endpointOption: makeEndpointOption(),
+      }),
+    ).rejects.toMatchObject({
+      code: ErrorTypes.STATEFUL_CODE_ENVIRONMENT_NOT_ALLOWED,
+    });
+
+    expect(agentClientArgs).toBeUndefined();
+    expect(mockInitializeAgent).toHaveBeenCalledTimes(1);
+  });
+
   it('omits a descriptor when its metadata lookup fails without aborting the primary run', async () => {
     const primaryConfig = makePrimaryConfig({
       subagents: { enabled: true, allowSelf: false, agent_ids: [SUBAGENT_ID] },
diff --git a/client/src/components/Nav/Settings/StatefulWorkspaceDefault.tsx b/client/src/components/Nav/Settings/StatefulWorkspaceDefault.tsx
index 2d2f2c5857..4057336614 100644
--- a/client/src/components/Nav/Settings/StatefulWorkspaceDefault.tsx
+++ b/client/src/components/Nav/Settings/StatefulWorkspaceDefault.tsx
@@ -7,18 +7,34 @@ import {
   SelectTrigger,
   useToastContext,
 } from '@librechat/client';
-
+import {
+  STATEFUL_CODE_ENVIRONMENTS,
+  resolveAllowedStatefulCodeEnvironments,
+  resolveStatefulCodeEnvironment,
+} from 'librechat-data-provider';
 import type { StatefulCodeEnvironment } from 'librechat-data-provider';
 import { useGetUserQuery, useUpdateUserPreferencesMutation } from '~/data-provider';
-import { useLocalize } from '~/hooks';
+import { useGetAgentsConfig, useLocalize } from '~/hooks';
 
 const FALLBACK_ENVIRONMENT: StatefulCodeEnvironment = 'user';
+const ENVIRONMENT_LABELS = {
+  user: 'com_ui_stateful_code_environment_user',
+  'agent-user': 'com_ui_stateful_code_environment_agent_user',
+  conversation: 'com_ui_stateful_code_environment_conversation',
+} as const;
 
 export default function StatefulWorkspaceDefault() {
   const localize = useLocalize();
   const { showToast } = useToastContext();
   const { data: user } = useGetUserQuery();
-  const savedEnvironment = user?.personalization?.statefulCodeEnvironment ?? FALLBACK_ENVIRONMENT;
+  const { agentsConfig } = useGetAgentsConfig();
+  const configuredEnvironments = agentsConfig?.statefulCodeSessions?.allowedEnvironments;
+  const allowedEnvironments = resolveAllowedStatefulCodeEnvironments(configuredEnvironments);
+  const savedPreference = user?.personalization?.statefulCodeEnvironment;
+  const savedEnvironment =
+    savedPreference ??
+    resolveStatefulCodeEnvironment(FALLBACK_ENVIRONMENT, configuredEnvironments) ??
+    FALLBACK_ENVIRONMENT;
   const [environment, setEnvironment] = useState<StatefulCodeEnvironment>(savedEnvironment);
 
   useEffect(() => {
@@ -36,6 +52,9 @@ export default function StatefulWorkspaceDefault() {
 
   const handleChange = (value: string) => {
     const statefulCodeEnvironment = value as StatefulCodeEnvironment;
+    if (!allowedEnvironments.includes(statefulCodeEnvironment)) {
+      return;
+    }
     setEnvironment(statefulCodeEnvironment);
     mutation.mutate({ statefulCodeEnvironment });
   };
@@ -61,13 +80,18 @@ export default function StatefulWorkspaceDefault() {
           <SelectValue />
         </SelectTrigger>
         <SelectContent>
-          <SelectItem value="user">{localize('com_ui_stateful_code_environment_user')}</SelectItem>
-          <SelectItem value="agent-user">
-            {localize('com_ui_stateful_code_environment_agent_user')}
-          </SelectItem>
-          <SelectItem value="conversation">
-            {localize('com_ui_stateful_code_environment_conversation')}
-          </SelectItem>
+          {STATEFUL_CODE_ENVIRONMENTS.filter(
+            (candidate) =>
+              allowedEnvironments.includes(candidate) || candidate === savedEnvironment,
+          ).map((candidate) => (
+            <SelectItem
+              key={candidate}
+              value={candidate}
+              disabled={!allowedEnvironments.includes(candidate)}
+            >
+              {localize(ENVIRONMENT_LABELS[candidate])}
+            </SelectItem>
+          ))}
         </SelectContent>
       </Select>
     </div>
diff --git a/client/src/components/Nav/Settings/__tests__/StatefulWorkspaceDefault.spec.tsx b/client/src/components/Nav/Settings/__tests__/StatefulWorkspaceDefault.spec.tsx
index adfe650432..9e3773a5d3 100644
--- a/client/src/components/Nav/Settings/__tests__/StatefulWorkspaceDefault.spec.tsx
+++ b/client/src/components/Nav/Settings/__tests__/StatefulWorkspaceDefault.spec.tsx
@@ -5,6 +5,7 @@ import StatefulWorkspaceDefault from '../StatefulWorkspaceDefault';
 
 const mockMutate = jest.fn();
 const mockShowToast = jest.fn();
+let mockAllowedEnvironments: Array<'user' | 'agent-user' | 'conversation'> | undefined;
 
 jest.mock('@librechat/client', () => ({
   Select: ({
@@ -30,14 +31,33 @@ jest.mock('@librechat/client', () => ({
   SelectTrigger: ({ children }: { children: ReactNode }) => children,
   SelectValue: () => null,
   SelectContent: ({ children }: { children: ReactNode }) => children,
-  SelectItem: ({ value, children }: { value: string; children: ReactNode }) => (
-    <option value={value}>{children}</option>
+  SelectItem: ({
+    value,
+    children,
+    disabled,
+  }: {
+    value: string;
+    children: ReactNode;
+    disabled?: boolean;
+  }) => (
+    <option value={value} disabled={disabled}>
+      {children}
+    </option>
   ),
   useToastContext: () => ({ showToast: mockShowToast }),
 }));
 
 jest.mock('~/hooks', () => ({
   useLocalize: () => (key: string) => key,
+  useGetAgentsConfig: () => ({
+    agentsConfig: {
+      capabilities: ['stateful_code_sessions'],
+      statefulCodeSessions:
+        mockAllowedEnvironments == null
+          ? undefined
+          : { allowedEnvironments: mockAllowedEnvironments },
+    },
+  }),
 }));
 
 jest.mock('~/data-provider', () => ({
@@ -53,6 +73,7 @@ jest.mock('~/data-provider', () => ({
 describe('StatefulWorkspaceDefault', () => {
   beforeEach(() => {
     mockMutate.mockClear();
+    mockAllowedEnvironments = undefined;
   });
 
   it('shows the saved user preference', () => {
@@ -71,4 +92,20 @@ describe('StatefulWorkspaceDefault', () => {
 
     expect(mockMutate).toHaveBeenCalledWith({ statefulCodeEnvironment: 'conversation' });
   });
+
+  it('only enables deployment-allowed scopes while preserving the saved value', () => {
+    mockAllowedEnvironments = ['user'];
+
+    render(<StatefulWorkspaceDefault />);
+
+    expect(
+      screen.getByRole('option', { name: 'com_ui_stateful_code_environment_user' }),
+    ).toBeEnabled();
+    expect(
+      screen.getByRole('option', { name: 'com_ui_stateful_code_environment_agent_user' }),
+    ).toBeDisabled();
+    expect(
+      screen.queryByRole('option', { name: 'com_ui_stateful_code_environment_conversation' }),
+    ).not.toBeInTheDocument();
+  });
 });
diff --git a/client/src/components/SidePanel/Agents/Advanced/StatefulSessions.tsx b/client/src/components/SidePanel/Agents/Advanced/StatefulSessions.tsx
index 4fce6a8633..77d6445e59 100644
--- a/client/src/components/SidePanel/Agents/Advanced/StatefulSessions.tsx
+++ b/client/src/components/SidePanel/Agents/Advanced/StatefulSessions.tsx
@@ -1,5 +1,10 @@
 import { useFormContext } from 'react-hook-form';
-import { AgentCapabilities } from 'librechat-data-provider';
+import {
+  AgentCapabilities,
+  STATEFUL_CODE_ENVIRONMENTS,
+  resolveStatefulCodeEnvironment,
+  resolveAllowedStatefulCodeEnvironments,
+} from 'librechat-data-provider';
 import {
   Switch,
   Select,
@@ -15,25 +20,38 @@ import {
 } from '@librechat/client';
 import type { StatefulCodeEnvironment } from 'librechat-data-provider';
 import type { AgentForm } from '~/common';
-import { useAuthContext, useLocalize } from '~/hooks';
+import { useAuthContext, useGetAgentsConfig, useLocalize } from '~/hooks';
 import { ESide } from '~/common';
 
+const ENVIRONMENT_LABELS = {
+  user: 'com_ui_stateful_code_environment_user',
+  'agent-user': 'com_ui_stateful_code_environment_agent_user',
+  conversation: 'com_ui_stateful_code_environment_conversation',
+} as const;
+
 export default function StatefulSessions() {
   const localize = useLocalize();
   const { user } = useAuthContext();
+  const { agentsConfig } = useGetAgentsConfig();
   const methods = useFormContext<AgentForm>();
   const { setValue, watch } = methods;
 
   const enabled = watch(AgentCapabilities.stateful_code_sessions) ?? false;
   const codeEnabled = watch(AgentCapabilities.execute_code);
   const environment = watch('stateful_code_environment') ?? 'user';
+  const configuredEnvironments = agentsConfig?.statefulCodeSessions?.allowedEnvironments;
+  const allowedEnvironments = resolveAllowedStatefulCodeEnvironments(configuredEnvironments);
 
   const handleChange = (value: boolean) => {
     setValue(AgentCapabilities.stateful_code_sessions, value, { shouldDirty: true });
-    if (value && !watch('stateful_code_environment')) {
+    const currentEnvironment = watch('stateful_code_environment');
+    if (value && (!currentEnvironment || !allowedEnvironments.includes(currentEnvironment))) {
       setValue(
         'stateful_code_environment',
-        user?.personalization?.statefulCodeEnvironment ?? 'user',
+        resolveStatefulCodeEnvironment(
+          user?.personalization?.statefulCodeEnvironment ?? 'user',
+          configuredEnvironments,
+        ) ?? 'user',
         { shouldDirty: true },
       );
     }
@@ -81,25 +99,28 @@ export default function StatefulSessions() {
           </label>
           <Select
             value={environment}
-            onValueChange={(value) =>
-              setValue('stateful_code_environment', value as StatefulCodeEnvironment, {
-                shouldDirty: true,
-              })
-            }
+            onValueChange={(value) => {
+              const nextEnvironment = value as StatefulCodeEnvironment;
+              if (allowedEnvironments.includes(nextEnvironment)) {
+                setValue('stateful_code_environment', nextEnvironment, { shouldDirty: true });
+              }
+            }}
           >
             <SelectTrigger id="stateful-code-environment" data-testid="stateful-code-environment">
               <SelectValue />
             </SelectTrigger>
             <SelectContent>
-              <SelectItem value="user">
-                {localize('com_ui_stateful_code_environment_user')}
-              </SelectItem>
-              <SelectItem value="agent-user">
-                {localize('com_ui_stateful_code_environment_agent_user')}
-              </SelectItem>
-              <SelectItem value="conversation">
-                {localize('com_ui_stateful_code_environment_conversation')}
-              </SelectItem>
+              {STATEFUL_CODE_ENVIRONMENTS.filter(
+                (candidate) => allowedEnvironments.includes(candidate) || candidate === environment,
+              ).map((candidate) => (
+                <SelectItem
+                  key={candidate}
+                  value={candidate}
+                  disabled={!allowedEnvironments.includes(candidate)}
+                >
+                  {localize(ENVIRONMENT_LABELS[candidate])}
+                </SelectItem>
+              ))}
             </SelectContent>
           </Select>
           <p className="text-xs text-text-tertiary">
diff --git a/client/src/components/SidePanel/Agents/AgentPanel.tsx b/client/src/components/SidePanel/Agents/AgentPanel.tsx
index 99e8938374..4dc9226015 100644
--- a/client/src/components/SidePanel/Agents/AgentPanel.tsx
+++ b/client/src/components/SidePanel/Agents/AgentPanel.tsx
@@ -11,6 +11,7 @@ import {
   ResourceType,
   EModelEndpoint,
   PermissionBits,
+  resolveStatefulCodeEnvironment,
   isAssistantsEndpoint,
 } from 'librechat-data-provider';
 import type { Agent, AgentUpdateParams } from 'librechat-data-provider';
@@ -286,7 +287,11 @@ export default function AgentPanel() {
     setCurrentAgentId,
     agent_id: current_agent_id,
   } = useAgentPanelContext();
-  const defaultStatefulCodeEnvironment = user?.personalization?.statefulCodeEnvironment ?? 'user';
+  const defaultStatefulCodeEnvironment =
+    resolveStatefulCodeEnvironment(
+      user?.personalization?.statefulCodeEnvironment ?? 'user',
+      agentsConfig?.statefulCodeSessions?.allowedEnvironments,
+    ) ?? 'user';
 
   const { onSelect: onSelectAgent } = useSelectAgent();
 
diff --git a/client/src/components/SidePanel/Agents/DeleteButton.tsx b/client/src/components/SidePanel/Agents/DeleteButton.tsx
index fba6059975..93da129175 100644
--- a/client/src/components/SidePanel/Agents/DeleteButton.tsx
+++ b/client/src/components/SidePanel/Agents/DeleteButton.tsx
@@ -1,6 +1,7 @@
 import { memo } from 'react';
 import { useFormContext } from 'react-hook-form';
 import { useRecoilValue, useSetRecoilState } from 'recoil';
+import { resolveStatefulCodeEnvironment } from 'librechat-data-provider';
 import {
   Label,
   Button,
@@ -12,9 +13,9 @@ import {
 } from '@librechat/client';
 import type { Agent, AgentCreateParams } from 'librechat-data-provider';
 import type { UseMutationResult } from '@tanstack/react-query';
+import { useAuthContext, useGetAgentsConfig, useLocalize } from '~/hooks';
 import { logger, getDefaultAgentFormValues } from '~/utils';
 import { useDeleteAgentMutation } from '~/data-provider';
-import { useAuthContext, useLocalize } from '~/hooks';
 import { isEphemeralAgent } from '~/common';
 import store from '~/store';
 
@@ -29,6 +30,7 @@ function DeleteButton({
 }) {
   const localize = useLocalize();
   const { user } = useAuthContext();
+  const { agentsConfig } = useGetAgentsConfig();
   const { reset } = useFormContext();
   const { showToast } = useToastContext();
   const setConversation = useSetRecoilState(store.conversationByIndex(0));
@@ -54,7 +56,14 @@ function DeleteButton({
       const firstAgent = updatedList[0] as Agent | undefined;
       if (!firstAgent) {
         setCurrentAgentId(undefined);
-        reset(getDefaultAgentFormValues(user?.personalization?.statefulCodeEnvironment ?? 'user'));
+        reset(
+          getDefaultAgentFormValues(
+            resolveStatefulCodeEnvironment(
+              user?.personalization?.statefulCodeEnvironment ?? 'user',
+              agentsConfig?.statefulCodeSessions?.allowedEnvironments,
+            ) ?? 'user',
+          ),
+        );
         setConversation((prev) => (prev ? { ...prev, agent_id: '' } : prev));
         return;
       }
diff --git a/librechat.example.yaml b/librechat.example.yaml
index 7be6cdc698..493ba92060 100644
--- a/librechat.example.yaml
+++ b/librechat.example.yaml
@@ -503,6 +503,9 @@ endpoints:
   #   # The following capabilities are opt-in and must be added explicitly:
   #   # "programmatic_tools", "stateful_code_sessions", "run_in_background", "tool_intents"
   #   # "stateful_code_sessions" is highly experimental and may change substantially.
+  #   # (optional) Limit the workspace scopes users may select. Omit to allow all three.
+  #   statefulCodeSessions:
+  #     allowedEnvironments: ["user", "agent-user", "conversation"]
   #   # "run_in_background" makes Code Interpreter tools eligible by default and enables per-tool MCP opt-in.
   #   # "tool_intents" enables live model-written labels for native tools and opted-in MCP tools.
   #   # (optional) Require user approval before matching tool calls. Disabled by default.
diff --git a/packages/api/src/agents/__tests__/initialize.test.ts b/packages/api/src/agents/__tests__/initialize.test.ts
index fb0ff6de28..8138eb2e04 100644
--- a/packages/api/src/agents/__tests__/initialize.test.ts
+++ b/packages/api/src/agents/__tests__/initialize.test.ts
@@ -110,6 +110,7 @@ jest.mock('../resources', () => ({
 }));
 
 import { initializeAgent } from '../initialize';
+import { isFatalAgentInitializationError } from '../errors';
 
 const realUtils = jest.requireActual<typeof import('~/utils')>('~/utils');
 
@@ -1782,6 +1783,74 @@ describe('initializeAgent — execute_code capability expansion', () => {
     }
   });
 
+  it('rejects a stateful environment excluded by deployment policy', async () => {
+    const { agent, req, res, loadTools, db } = createMocks();
+    agent.tools = ['execute_code'];
+    agent.stateful_code_sessions = true;
+    agent.stateful_code_environment = 'conversation';
+    req.config = {
+      endpoints: {
+        [EModelEndpoint.agents]: {
+          statefulCodeSessions: { allowedEnvironments: ['user'] },
+        },
+      },
+    } as NonNullable<typeof req.config>;
+
+    let error;
+    try {
+      await initializeAgent(
+        {
+          req,
+          res,
+          agent,
+          loadTools,
+          endpointOption: { endpoint: EModelEndpoint.agents },
+          allowedProviders: new Set([Providers.OPENAI]),
+          isInitialAgent: true,
+          codeEnvAvailable: true,
+          statefulSessionsAvailable: true,
+        },
+        db,
+      );
+    } catch (caught) {
+      error = caught;
+    }
+
+    expect(error).toMatchObject({
+      code: ErrorTypes.STATEFUL_CODE_ENVIRONMENT_NOT_ALLOWED,
+      message: 'Stateful code environment is not allowed by this deployment: conversation',
+    });
+    expect(isFatalAgentInitializationError(error)).toBe(true);
+    expect(loadTools).not.toHaveBeenCalled();
+  });
+
+  it('uses an explicit stateful environment allowlist when req.config is unavailable', async () => {
+    const { agent, req, res, loadTools, db } = createMocks();
+    agent.tools = ['execute_code'];
+    agent.stateful_code_sessions = true;
+    agent.stateful_code_environment = 'conversation';
+    req.config = undefined;
+
+    await expect(
+      initializeAgent(
+        {
+          req,
+          res,
+          agent,
+          loadTools,
+          endpointOption: { endpoint: EModelEndpoint.agents },
+          allowedProviders: new Set([Providers.OPENAI]),
+          isInitialAgent: true,
+          codeEnvAvailable: true,
+          statefulSessionsAvailable: true,
+          allowedStatefulCodeEnvironments: ['user'],
+        },
+        db,
+      ),
+    ).rejects.toMatchObject({ code: ErrorTypes.STATEFUL_CODE_ENVIRONMENT_NOT_ALLOWED });
+    expect(loadTools).not.toHaveBeenCalled();
+  });
+
   it('upgrades read_file to the skill-aware description when active skills are in scope', async () => {
     const { agent, req, res, loadTools, db } = createMocks();
     agent.tools = ['execute_code'];
diff --git a/packages/api/src/agents/errors.spec.ts b/packages/api/src/agents/errors.spec.ts
index b2c88a25c7..e75982b3af 100644
--- a/packages/api/src/agents/errors.spec.ts
+++ b/packages/api/src/agents/errors.spec.ts
@@ -2,12 +2,13 @@ import { ErrorTypes } from 'librechat-data-provider';
 import { AGENT_EXPECTED_MCP_TOOLS_UNAVAILABLE, isFatalAgentInitializationError } from './errors';
 
 describe('isFatalAgentInitializationError', () => {
-  it.each([ErrorTypes.RESOURCE_RECOVERY_REQUIRED, AGENT_EXPECTED_MCP_TOOLS_UNAVAILABLE])(
-    'classifies %s as fatal',
-    (code) => {
-      expect(isFatalAgentInitializationError({ code })).toBe(true);
-    },
-  );
+  it.each([
+    ErrorTypes.RESOURCE_RECOVERY_REQUIRED,
+    ErrorTypes.STATEFUL_CODE_ENVIRONMENT_NOT_ALLOWED,
+    AGENT_EXPECTED_MCP_TOOLS_UNAVAILABLE,
+  ])('classifies %s as fatal', (code) => {
+    expect(isFatalAgentInitializationError({ code })).toBe(true);
+  });
 
   it('allows skill-added MCP tools to fall back while keeping resource recovery fatal', () => {
     const options = { allowExpectedMCPFallback: true };
diff --git a/packages/api/src/agents/errors.ts b/packages/api/src/agents/errors.ts
index b1809a094d..bb3e6aef49 100644
--- a/packages/api/src/agents/errors.ts
+++ b/packages/api/src/agents/errors.ts
@@ -2,6 +2,17 @@ import { ErrorTypes } from 'librechat-data-provider';
 
 export const AGENT_EXPECTED_MCP_TOOLS_UNAVAILABLE = 'AGENT_EXPECTED_MCP_TOOLS_UNAVAILABLE';
 
+export function createStatefulCodeEnvironmentPolicyError(environment: string): Error {
+  return Object.assign(
+    new Error(`Stateful code environment is not allowed by this deployment: ${environment}`),
+    {
+      code: ErrorTypes.STATEFUL_CODE_ENVIRONMENT_NOT_ALLOWED,
+      status: 403,
+      statusCode: 403,
+    },
+  );
+}
+
 export interface FatalAgentInitializationOptions {
   /**
    * Skill `allowed-tools` may add an MCP tool beyond the agent's configured
@@ -31,6 +42,7 @@ export function isFatalAgentInitializationError(
   const code = getErrorCode(error);
   return (
     code === ErrorTypes.RESOURCE_RECOVERY_REQUIRED ||
+    code === ErrorTypes.STATEFUL_CODE_ENVIRONMENT_NOT_ALLOWED ||
     (code === AGENT_EXPECTED_MCP_TOOLS_UNAVAILABLE && options.allowExpectedMCPFallback !== true)
   );
 }
diff --git a/packages/api/src/agents/initialize.ts b/packages/api/src/agents/initialize.ts
index c38d96260d..7e49a30a91 100644
--- a/packages/api/src/agents/initialize.ts
+++ b/packages/api/src/agents/initialize.ts
@@ -9,6 +9,7 @@ import {
   paramEndpoints,
   isAgentsEndpoint,
   AgentCapabilities,
+  resolveAllowedStatefulCodeEnvironments,
   replaceSpecialVars,
   providerEndpointMap,
 } from 'librechat-data-provider';
@@ -20,6 +21,7 @@ import type {
   TFile,
   Agent,
   TUser,
+  StatefulCodeEnvironment,
 } from 'librechat-data-provider';
 import type { GenericTool, LCToolRegistry, ToolMap, LCTool } from '@librechat/agents';
 import type { IMongoFile, FileOwnerScope } from '@librechat/data-schemas';
@@ -67,9 +69,12 @@ import {
   registerFileAuthoringTools,
   isFileAuthoringToolDefinition,
 } from './tools';
+import {
+  createStatefulCodeEnvironmentPolicyError,
+  isFatalAgentInitializationError,
+} from './errors';
 import { registerMemoryTools, memoryToolUsageGuard } from './memory';
 import { applyIntentLabels, sanitizeIntentLabels } from './intent';
-import { isFatalAgentInitializationError } from './errors';
 import { applyBackgroundToolCalls } from './background';
 import { filterFilesByEndpointConfig } from '~/files';
 import { generateArtifactsPrompt } from '~/prompts';
@@ -478,6 +483,8 @@ export interface InitializeAgentParams {
   toolIntentsAvailable?: boolean;
   /** Whether stateful code sessions are available (stateful_code_sessions capability enabled) */
   statefulSessionsAvailable?: boolean;
+  /** Explicit deployment allowlist for request types that do not carry LibreChat config on req. */
+  allowedStatefulCodeEnvironments?: readonly StatefulCodeEnvironment[];
   /** Whether inline memory tools are available (memory capability enabled, memory
    *  configured, and the user permitted). When true and the agent lists the `memory`
    *  capability, `set_memory` + `delete_memory` are registered for the LLM. */
@@ -723,6 +730,15 @@ export async function initializeAgent(
     params.statefulSessionsAvailable === true &&
     agent.stateful_code_sessions === true;
   const statefulCodeEnvironment = normalizeStatefulCodeEnvironment(agent.stateful_code_environment);
+  if (effectiveStatefulSessions) {
+    const allowedStatefulCodeEnvironments = resolveAllowedStatefulCodeEnvironments(
+      params.allowedStatefulCodeEnvironments ??
+        req.config?.endpoints?.[EModelEndpoint.agents]?.statefulCodeSessions?.allowedEnvironments,
+    );
+    if (!allowedStatefulCodeEnvironments.includes(statefulCodeEnvironment)) {
+      throw createStatefulCodeEnvironmentPolicyError(statefulCodeEnvironment);
+    }
+  }
   const codeExecutionContext = resolveCodeExecutionContext({
     statefulSessions: effectiveStatefulSessions,
     environment: statefulCodeEnvironment,
diff --git a/packages/api/src/agents/openai/service.spec.ts b/packages/api/src/agents/openai/service.spec.ts
index 48892e627f..75bcf09172 100644
--- a/packages/api/src/agents/openai/service.spec.ts
+++ b/packages/api/src/agents/openai/service.spec.ts
@@ -1,3 +1,4 @@
+import { ErrorTypes } from 'librechat-data-provider';
 import type { ChatCompletionDependencies } from './service';
 import { createAgentChatCompletion } from './service';
 
@@ -140,4 +141,50 @@ describe('createAgentChatCompletion - MCP permission user propagation', () => {
     });
     expect(runArgs.appConfig).not.toHaveProperty('interfaceConfig');
   });
+
+  it('forwards the stateful environment allowlist from appConfig to agent initialization', async () => {
+    deps.appConfig = {
+      endpoints: {
+        agents: {
+          capabilities: ['execute_code', 'stateful_code_sessions'],
+          statefulCodeSessions: { allowedEnvironments: ['user', 'agent-user'] },
+        },
+      },
+    } as never;
+
+    await createAgentChatCompletion(createMockReq({ id: 'user-123' }), createMockRes(), deps);
+
+    expect(deps.initializeAgent).toHaveBeenCalledWith(
+      expect.objectContaining({
+        codeEnvAvailable: true,
+        statefulSessionsAvailable: true,
+        allowedStatefulCodeEnvironments: ['user', 'agent-user'],
+      }),
+    );
+  });
+
+  it('preserves stateful scope policy status and code in an initialization error response', async () => {
+    const policyError = Object.assign(
+      new Error('Stateful code environment is not allowed by this deployment: conversation'),
+      {
+        code: ErrorTypes.STATEFUL_CODE_ENVIRONMENT_NOT_ALLOWED,
+        status: 403,
+        statusCode: 403,
+      },
+    );
+    (deps.initializeAgent as jest.Mock).mockRejectedValueOnce(policyError);
+    const res = createMockRes();
+
+    await createAgentChatCompletion(createMockReq({ id: 'user-123' }), res, deps);
+
+    expect(res.status).toHaveBeenCalledWith(403);
+    expect(res.json).toHaveBeenCalledWith({
+      error: {
+        message: policyError.message,
+        type: 'invalid_request_error',
+        param: null,
+        code: ErrorTypes.STATEFUL_CODE_ENVIRONMENT_NOT_ALLOWED,
+      },
+    });
+  });
 });
diff --git a/packages/api/src/agents/openai/service.ts b/packages/api/src/agents/openai/service.ts
index ebc8122916..193e8fa92f 100644
--- a/packages/api/src/agents/openai/service.ts
+++ b/packages/api/src/agents/openai/service.ts
@@ -20,6 +20,7 @@
  */
 import { nanoid } from 'nanoid';
 import { AgentCapabilities } from 'librechat-data-provider';
+import type { StatefulCodeEnvironment } from 'librechat-data-provider';
 import type { Response as ServerResponse, Request } from 'express';
 import type {
   ChatCompletionResponse,
@@ -155,6 +156,8 @@ interface InitializeAgentParams {
    * in-repo controllers; absent / `undefined` disables the feature.
    */
   statefulSessionsAvailable?: boolean;
+  /** Deployment allowlist carried explicitly because this route's Request has no req.config. */
+  allowedStatefulCodeEnvironments?: readonly StatefulCodeEnvironment[];
   /**
    * Whether the admin-level `run_in_background` capability is enabled.
    * Gates `applyBackgroundToolCalls` in `initializeAgent` (the injected
@@ -475,6 +478,16 @@ export async function createAgentChatCompletion(
      *  also carries each agent's trusted stateful endpoint/profile selection
      *  into tool loading and prewarming. */
     const statefulSessionsAvailable = capabilityEnabled(AgentCapabilities.stateful_code_sessions);
+    const allowedStatefulCodeEnvironments =
+      agentsConfig != null && typeof agentsConfig === 'object'
+        ? (
+            agentsConfig as {
+              statefulCodeSessions?: {
+                allowedEnvironments?: readonly StatefulCodeEnvironment[];
+              };
+            }
+          ).statefulCodeSessions?.allowedEnvironments
+        : undefined;
     /** Same gate as the in-repo controllers: without it, agents that opted
      *  tools in via tool_options.run_in_background silently lose the
      *  background param + poll tool on this route. */
@@ -498,6 +511,7 @@ export async function createAgentChatCompletion(
       isInitialAgent: true,
       codeEnvAvailable,
       statefulSessionsAvailable,
+      allowedStatefulCodeEnvironments,
       backgroundToolsAvailable,
       toolIntentsAvailable,
     });
@@ -637,7 +651,27 @@ export async function createAgentChatCompletion(
       writeSSE(res, '[DONE]');
       res.end();
     } else {
-      sendErrorResponse(res, 500, errorMessage, 'server_error');
+      const candidateStatus =
+        error != null && typeof error === 'object'
+          ? ((error as { status?: unknown; statusCode?: unknown }).status ??
+            (error as { statusCode?: unknown }).statusCode)
+          : undefined;
+      const statusCode =
+        typeof candidateStatus === 'number' &&
+        Number.isInteger(candidateStatus) &&
+        candidateStatus >= 400 &&
+        candidateStatus < 600
+          ? candidateStatus
+          : 500;
+      const errorType =
+        statusCode >= 400 && statusCode < 500 ? 'invalid_request_error' : 'server_error';
+      const errorCode =
+        error != null &&
+        typeof error === 'object' &&
+        typeof (error as { code?: unknown }).code === 'string'
+          ? (error as { code: string }).code
+          : null;
+      sendErrorResponse(res, statusCode, errorMessage, errorType, errorCode);
     }
   }
 }
diff --git a/packages/api/src/endpoints/config/endpoints.spec.ts b/packages/api/src/endpoints/config/endpoints.spec.ts
index e0155fe323..fdeb341f17 100644
--- a/packages/api/src/endpoints/config/endpoints.spec.ts
+++ b/packages/api/src/endpoints/config/endpoints.spec.ts
@@ -175,6 +175,30 @@ describe('createEndpointsConfigService', () => {
       expect(result?.[EModelEndpoint.agents]?.allowedProviders).toEqual(['openAI', 'anthropic']);
     });
 
+    it('exposes the deployment stateful environment allowlist', async () => {
+      const deps = createMockDeps({
+        loadDefaultEndpointsConfig: jest.fn().mockResolvedValue({
+          [EModelEndpoint.agents]: { userProvide: false, order: 0 },
+        }),
+        getAppConfig: jest.fn().mockResolvedValue(
+          appConfig({
+            endpoints: {
+              [EModelEndpoint.agents]: {
+                statefulCodeSessions: { allowedEnvironments: ['user', 'agent-user'] },
+              },
+            },
+          }),
+        ),
+      });
+      const { getEndpointsConfig } = createEndpointsConfigService(deps);
+
+      const result = await getEndpointsConfig(fakeReq());
+
+      expect(result?.[EModelEndpoint.agents]?.statefulCodeSessions).toEqual({
+        allowedEnvironments: ['user', 'agent-user'],
+      });
+    });
+
     it('merges bedrock availableRegions', async () => {
       const deps = createMockDeps({
         loadDefaultEndpointsConfig: jest.fn().mockResolvedValue({
diff --git a/packages/api/src/endpoints/config/endpoints.ts b/packages/api/src/endpoints/config/endpoints.ts
index fd9e8c3018..b7f58985fe 100644
--- a/packages/api/src/endpoints/config/endpoints.ts
+++ b/packages/api/src/endpoints/config/endpoints.ts
@@ -70,13 +70,14 @@ export function createEndpointsConfigService(deps: EndpointsConfigDeps): {
     }
 
     if (mergedConfig[EModelEndpoint.agents] && appConfig?.endpoints?.[EModelEndpoint.agents]) {
-      const { disableBuilder, capabilities, allowedProviders } =
+      const { disableBuilder, capabilities, allowedProviders, statefulCodeSessions } =
         appConfig.endpoints[EModelEndpoint.agents];
       mergedConfig[EModelEndpoint.agents] = {
         ...mergedConfig[EModelEndpoint.agents],
         allowedProviders,
         disableBuilder,
         capabilities,
+        statefulCodeSessions,
       };
     }
 
diff --git a/packages/api/src/user/preferences.spec.ts b/packages/api/src/user/preferences.spec.ts
index d33ff364fc..004cdd0d3e 100644
--- a/packages/api/src/user/preferences.spec.ts
+++ b/packages/api/src/user/preferences.spec.ts
@@ -69,6 +69,27 @@ describe('createUserPreferencesHandler', () => {
     expect(response.statusCode).toBe(400);
   });
 
+  it('rejects a valid scope excluded by deployment policy', async () => {
+    const updateStatefulCodeEnvironment = jest.fn();
+    const handler = createUserPreferencesHandler({ updateStatefulCodeEnvironment });
+    const response = createResponse();
+    const request = createRequest({ statefulCodeEnvironment: 'conversation' }) as Parameters<
+      typeof handler
+    >[0];
+    request.config = {
+      endpoints: {
+        agents: {
+          statefulCodeSessions: { allowedEnvironments: ['user', 'agent-user'] },
+        },
+      },
+    } as NonNullable<typeof request.config>;
+
+    await handler(request, response as Response);
+
+    expect(updateStatefulCodeEnvironment).not.toHaveBeenCalled();
+    expect(response.statusCode).toBe(403);
+  });
+
   it('requires an authenticated user', async () => {
     const updateStatefulCodeEnvironment = jest.fn();
     const handler = createUserPreferencesHandler({ updateStatefulCodeEnvironment });
diff --git a/packages/api/src/user/preferences.ts b/packages/api/src/user/preferences.ts
index 780db1f9d0..bc0c81b521 100644
--- a/packages/api/src/user/preferences.ts
+++ b/packages/api/src/user/preferences.ts
@@ -1,8 +1,12 @@
 import { logger } from '@librechat/data-schemas';
-import { STATEFUL_CODE_ENVIRONMENTS } from 'librechat-data-provider';
+import {
+  STATEFUL_CODE_ENVIRONMENTS,
+  resolveAllowedStatefulCodeEnvironments,
+} from 'librechat-data-provider';
 import type { StatefulCodeEnvironment } from 'librechat-data-provider';
 import type { IUser } from '@librechat/data-schemas';
-import type { Request, Response } from 'express';
+import type { Response } from 'express';
+import type { ServerRequest } from '~/types';
 
 interface UserPreferencesBody {
   statefulCodeEnvironment?: string;
@@ -12,7 +16,8 @@ function isStatefulCodeEnvironment(value: string): value is StatefulCodeEnvironm
   return STATEFUL_CODE_ENVIRONMENTS.some((environment) => environment === value);
 }
 
-type UserPreferencesRequest = Request<unknown, unknown, UserPreferencesBody> & {
+type UserPreferencesRequest = Omit<ServerRequest, 'body' | 'user'> & {
+  body: UserPreferencesBody;
   user?: IUser;
 };
 
@@ -39,6 +44,15 @@ export function createUserPreferencesHandler(
       });
     }
 
+    const allowedEnvironments = resolveAllowedStatefulCodeEnvironments(
+      req.config?.endpoints?.agents?.statefulCodeSessions?.allowedEnvironments,
+    );
+    if (!allowedEnvironments.includes(environment)) {
+      return res.status(403).json({
+        message: `statefulCodeEnvironment is not allowed by this deployment: ${environment}`,
+      });
+    }
+
     try {
       const updatedUser = await deps.updateStatefulCodeEnvironment(userId, environment);
       if (!updatedUser) {
diff --git a/packages/data-provider/specs/config-schemas.spec.ts b/packages/data-provider/specs/config-schemas.spec.ts
index 58b32f7da2..d81b2ea491 100644
--- a/packages/data-provider/specs/config-schemas.spec.ts
+++ b/packages/data-provider/specs/config-schemas.spec.ts
@@ -405,6 +405,27 @@ describe('endpointSchema addParams validation', () => {
 });
 
 describe('agentsEndpointSchema', () => {
+  it('accepts a non-empty stateful code environment allowlist', () => {
+    const result = agentsEndpointSchema.safeParse({
+      statefulCodeSessions: { allowedEnvironments: ['user', 'agent-user'] },
+    });
+
+    expect(result.success).toBe(true);
+  });
+
+  it('rejects empty or unknown stateful code environment allowlists', () => {
+    expect(
+      agentsEndpointSchema.safeParse({
+        statefulCodeSessions: { allowedEnvironments: [] },
+      }).success,
+    ).toBe(false);
+    expect(
+      agentsEndpointSchema.safeParse({
+        statefulCodeSessions: { allowedEnvironments: ['agent'] },
+      }).success,
+    ).toBe(false);
+  });
+
   it('does not accept baseURL', () => {
     const result = agentsEndpointSchema.safeParse({
       baseURL: 'https://example.com',
diff --git a/packages/data-provider/specs/stateful-code.spec.ts b/packages/data-provider/specs/stateful-code.spec.ts
new file mode 100644
index 0000000000..866a853ea7
--- /dev/null
+++ b/packages/data-provider/specs/stateful-code.spec.ts
@@ -0,0 +1,24 @@
+import {
+  STATEFUL_CODE_ENVIRONMENTS,
+  resolveStatefulCodeEnvironment,
+  resolveAllowedStatefulCodeEnvironments,
+} from '../src/types/assistants';
+
+describe('stateful code environment policy', () => {
+  it('allows every environment when deployment configuration is omitted', () => {
+    expect(resolveAllowedStatefulCodeEnvironments()).toEqual(STATEFUL_CODE_ENVIRONMENTS);
+  });
+
+  it('returns configured environments in stable UI order', () => {
+    expect(resolveAllowedStatefulCodeEnvironments(['conversation', 'user'])).toEqual([
+      'user',
+      'conversation',
+    ]);
+  });
+
+  it('falls back to the first allowed environment when a preference is unavailable', () => {
+    expect(resolveStatefulCodeEnvironment('user', ['agent-user', 'conversation'])).toBe(
+      'agent-user',
+    );
+  });
+});
diff --git a/packages/data-provider/src/config.ts b/packages/data-provider/src/config.ts
index 66a589e415..96a23396a3 100644
--- a/packages/data-provider/src/config.ts
+++ b/packages/data-provider/src/config.ts
@@ -9,6 +9,7 @@ import {
   eReasoningResponseKeySchema,
 } from './schemas';
 import { ComponentTypes, SettingTypes, OptionTypes } from './generate';
+import { STATEFUL_CODE_ENVIRONMENTS } from './stateful-code';
 import { specsConfigSchema, TSpecsConfig } from './models';
 import { REFILL_INTERVAL_UNITS } from './balance';
 import { fileConfigSchema } from './file-config';
@@ -1004,6 +1005,13 @@ export const agentsEndpointSchema = baseEndpointSchema
         .array(z.nativeEnum(AgentCapabilities))
         .optional()
         .default(defaultAgentCapabilities),
+      /** Controls which workspace-sharing scopes users may select for stateful code sessions.
+       *  Omit this block to preserve the legacy behavior of allowing every scope. */
+      statefulCodeSessions: z
+        .object({
+          allowedEnvironments: z.array(z.enum(STATEFUL_CODE_ENVIRONMENTS)).min(1),
+        })
+        .optional(),
       skills: z
         .object({
           maxCatalogSkills: z.number().int().min(1).max(100).optional(),
@@ -2722,6 +2730,10 @@ export enum ErrorTypes {
    * Required CodeAPI resources could not be restored before model invocation.
    */
   RESOURCE_RECOVERY_REQUIRED = 'resource_recovery_required',
+  /**
+   * Agent selected a stateful Code API workspace scope disabled by the deployment.
+   */
+  STATEFUL_CODE_ENVIRONMENT_NOT_ALLOWED = 'stateful_code_environment_not_allowed',
   /**
    * Invalid Agent Provider (excluded by Admin)
    */
diff --git a/packages/data-provider/src/stateful-code.ts b/packages/data-provider/src/stateful-code.ts
new file mode 100644
index 0000000000..1288ba0171
--- /dev/null
+++ b/packages/data-provider/src/stateful-code.ts
@@ -0,0 +1,24 @@
+export const STATEFUL_CODE_ENVIRONMENTS = ['user', 'agent-user', 'conversation'] as const;
+export type StatefulCodeEnvironment = (typeof STATEFUL_CODE_ENVIRONMENTS)[number];
+
+/** Resolve a deployment allowlist in stable UI order. An omitted value preserves
+ * the backward-compatible behavior where every environment is available. */
+export function resolveAllowedStatefulCodeEnvironments(
+  configured?: readonly StatefulCodeEnvironment[] | null,
+): StatefulCodeEnvironment[] {
+  if (configured == null) {
+    return [...STATEFUL_CODE_ENVIRONMENTS];
+  }
+
+  const configuredSet = new Set(configured);
+  return STATEFUL_CODE_ENVIRONMENTS.filter((environment) => configuredSet.has(environment));
+}
+
+/** Keep an allowed preference, otherwise select the first deployment-allowed scope. */
+export function resolveStatefulCodeEnvironment(
+  preferred: StatefulCodeEnvironment | null | undefined,
+  configured?: readonly StatefulCodeEnvironment[] | null,
+): StatefulCodeEnvironment | undefined {
+  const allowed = resolveAllowedStatefulCodeEnvironments(configured);
+  return preferred != null && allowed.includes(preferred) ? preferred : allowed[0];
+}
diff --git a/packages/data-provider/src/types.ts b/packages/data-provider/src/types.ts
index 5f3d81ffd9..6e67a03517 100644
--- a/packages/data-provider/src/types.ts
+++ b/packages/data-provider/src/types.ts
@@ -544,6 +544,9 @@ export type TConfig = {
   disableBuilder?: boolean;
   retrievalModels?: string[];
   capabilities?: string[];
+  statefulCodeSessions?: {
+    allowedEnvironments: StatefulCodeEnvironment[];
+  };
   customParams?: {
     defaultParamsEndpoint?: string;
     reasoningFormat?: ReasoningParameterFormat;
diff --git a/packages/data-provider/src/types/assistants.ts b/packages/data-provider/src/types/assistants.ts
index fadda72394..c6da929e30 100644
--- a/packages/data-provider/src/types/assistants.ts
+++ b/packages/data-provider/src/types/assistants.ts
@@ -1,9 +1,16 @@
 import type { OpenAPIV3 } from 'openapi-types';
 import type { AssistantsEndpoint, AgentProvider, MemoryScope } from 'src/schemas';
+import type { StatefulCodeEnvironment } from '../stateful-code';
 import type { Agents, GraphEdge } from './agents';
 import type { ContentTypes } from './runs';
 import type { TFile } from './files';
 import { ArtifactModes } from 'src/artifacts';
+export {
+  STATEFUL_CODE_ENVIRONMENTS,
+  resolveStatefulCodeEnvironment,
+  resolveAllowedStatefulCodeEnvironments,
+} from '../stateful-code';
+export type { StatefulCodeEnvironment } from '../stateful-code';
 
 export type Schema = OpenAPIV3.SchemaObject & { description?: string };
 export type Reference = OpenAPIV3.ReferenceObject & { description?: string };
@@ -538,9 +545,6 @@ export enum AnnotationTypes {
   FILE_PATH = 'file_path',
 }
 
-export const STATEFUL_CODE_ENVIRONMENTS = ['user', 'agent-user', 'conversation'] as const;
-export type StatefulCodeEnvironment = (typeof STATEFUL_CODE_ENVIRONMENTS)[number];
-
 export enum StepStatus {
   IN_PROGRESS = 'in_progress',
   CANCELLED = 'cancelled',