diff --git a/api/server/index.js b/api/server/index.js
index 501946a413..a8c7c35e5a 100644
--- a/api/server/index.js
+++ b/api/server/index.js
@@ -243,6 +243,7 @@ const startServer = async () => {
   app.use('/api/admin/roles', routes.adminRoles);
   app.use('/api/admin/skills', routes.adminSkills);
   app.use('/api/admin/users', routes.adminUsers);
+  app.use('/api/admin/audit-log', routes.adminAuditLog);
   app.use('/api/actions', routes.actions);
   app.use('/api/keys', routes.keys);
   app.use('/api/api-keys', routes.apiKeys);
diff --git a/api/server/routes/admin/audit.js b/api/server/routes/admin/audit.js
new file mode 100644
index 0000000000..083e905fe3
--- /dev/null
+++ b/api/server/routes/admin/audit.js
@@ -0,0 +1,25 @@
+const express = require('express');
+const { createAdminAuditLogHandlers } = require('@librechat/api');
+const { SystemCapabilities } = require('@librechat/data-schemas');
+const { requireCapability } = require('~/server/middleware/roles/capabilities');
+const { requireJwtAuth } = require('~/server/middleware');
+const db = require('~/models');
+
+const router = express.Router();
+
+const requireAdminAccess = requireCapability(SystemCapabilities.ACCESS_ADMIN);
+
+const handlers = createAdminAuditLogHandlers({
+  recordAuditEntry: db.recordAuditEntry,
+  listAuditLogPage: db.listAuditLogPage,
+  findAuditLogEntry: db.findAuditLogEntry,
+  streamAuditLogEntries: db.streamAuditLogEntries,
+});
+
+router.use(requireJwtAuth, requireAdminAccess);
+
+router.get('/', handlers.listAuditLog);
+router.get('/export.csv', handlers.exportAuditLogCsv);
+router.get('/:id', handlers.getAuditLogEntry);
+
+module.exports = router;
diff --git a/api/server/routes/admin/grants.js b/api/server/routes/admin/grants.js
index a0fa73dc43..9aa01e036f 100644
--- a/api/server/routes/admin/grants.js
+++ b/api/server/routes/admin/grants.js
@@ -21,6 +21,15 @@ const handlers = createAdminGrantsHandlers({
   getHeldCapabilities: db.getHeldCapabilities,
   getCachedPrincipals,
   checkRoleExists: async (name) => (await db.getRoleByName(name)) != null,
+  recordAuditEntry: db.recordAuditEntry,
+  resolveUserName: async (userId) => {
+    try {
+      const user = await db.getUserById(userId, 'name username email');
+      return user?.name || user?.username || user?.email || null;
+    } catch {
+      return null;
+    }
+  },
 });
 
 router.use(requireJwtAuth, requireAdminAccess);
diff --git a/api/server/routes/index.js b/api/server/routes/index.js
index 59955e937e..ac2b38f579 100644
--- a/api/server/routes/index.js
+++ b/api/server/routes/index.js
@@ -8,6 +8,7 @@ const adminGroups = require('./admin/groups');
 const adminRoles = require('./admin/roles');
 const adminSkills = require('./admin/skills');
 const adminUsers = require('./admin/users');
+const adminAuditLog = require('./admin/audit');
 const endpoints = require('./endpoints');
 const staticRoute = require('./static');
 const messages = require('./messages');
@@ -47,6 +48,7 @@ module.exports = {
   adminRoles,
   adminSkills,
   adminUsers,
+  adminAuditLog,
   keys,
   apiKeys,
   user,
diff --git a/packages/api/src/admin/auditLog.ts b/packages/api/src/admin/auditLog.ts
new file mode 100644
index 0000000000..94e12d7c4a
--- /dev/null
+++ b/packages/api/src/admin/auditLog.ts
@@ -0,0 +1,269 @@
+import { PrincipalType } from 'librechat-data-provider';
+import { logger } from '@librechat/data-schemas';
+import type {
+  AdminAuditLogEntryWire,
+  AuditAction,
+  AuditLogPage,
+  RecordAuditEntryInput,
+} from '@librechat/data-schemas';
+import type { Response } from 'express';
+import type { Types } from 'mongoose';
+import type { ServerRequest } from '~/types/http';
+
+const FORMULA_PREFIX = /^[=+\-@\t\r]/;
+const CSV_BOM = '';
+
+const VALID_ACTIONS = new Set<AuditAction>(['grant_assigned', 'grant_removed']);
+const VALID_PRINCIPAL_TYPES = new Set<string>(Object.values(PrincipalType));
+
+const ISO_DATE_RE = /^\d{4}-\d{2}-\d{2}(T\d{2}:\d{2}(:\d{2}(\.\d{1,3})?)?Z?)?$/;
+const OBJECT_ID_RE = /^[a-fA-F0-9]{24}$/;
+
+export interface AdminAuditLogDeps {
+  recordAuditEntry: (input: RecordAuditEntryInput) => Promise<unknown>;
+  listAuditLogPage: (
+    tenantId: string | undefined,
+    filters: {
+      search?: string;
+      action?: AuditAction[];
+      from?: Date;
+      to?: Date;
+      actorId?: string;
+      targetPrincipalType?: PrincipalType;
+      targetPrincipalId?: string;
+      capability?: string;
+      cursor?: string;
+      limit?: number;
+    },
+  ) => Promise<AuditLogPage>;
+  findAuditLogEntry: (
+    tenantId: string | undefined,
+    id: string,
+  ) => Promise<AdminAuditLogEntryWire | null>;
+  streamAuditLogEntries: (
+    tenantId: string | undefined,
+    filters: Parameters<AdminAuditLogDeps['listAuditLogPage']>[1],
+    onEntry: (entry: AdminAuditLogEntryWire) => void | Promise<void>,
+  ) => Promise<number>;
+}
+
+interface CallerContext {
+  userId: string;
+  role: string;
+  tenantId?: string;
+}
+
+function resolveCaller(req: ServerRequest): CallerContext | null {
+  const user = req.user;
+  if (!user) return null;
+  const userId = user._id?.toString() ?? user.id;
+  if (!userId || !user.role) return null;
+  return { userId, role: user.role, tenantId: user.tenantId };
+}
+
+function asStringArray(v: unknown): string[] | undefined {
+  if (v == null) return undefined;
+  if (Array.isArray(v)) return v.filter((x): x is string => typeof x === 'string');
+  if (typeof v === 'string') return [v];
+  return undefined;
+}
+
+function parseActionFilter(raw: unknown): AuditAction[] | undefined {
+  const arr = asStringArray(raw);
+  if (!arr || arr.length === 0) return undefined;
+  const valid = arr.filter((a): a is AuditAction => VALID_ACTIONS.has(a as AuditAction));
+  return valid.length ? valid : undefined;
+}
+
+function parseIsoDate(raw: unknown): { ok: true; value?: Date } | { ok: false; error: string } {
+  if (raw == null || raw === '') return { ok: true, value: undefined };
+  if (typeof raw !== 'string') return { ok: false, error: 'Date must be a string' };
+  if (!ISO_DATE_RE.test(raw)) return { ok: false, error: 'Date must be ISO 8601' };
+  const d = new Date(raw);
+  if (Number.isNaN(d.getTime())) return { ok: false, error: 'Invalid date' };
+  return { ok: true, value: d };
+}
+
+function parseLimit(raw: unknown): { ok: true; value: number | undefined } | { ok: false; error: string } {
+  if (raw == null || raw === '') return { ok: true, value: undefined };
+  const n = typeof raw === 'number' ? raw : Number.parseInt(String(raw), 10);
+  if (!Number.isFinite(n)) return { ok: false, error: 'limit must be a number' };
+  if (n < 1) return { ok: false, error: 'limit must be >= 1' };
+  if (n > 500) return { ok: false, error: 'limit must be <= 500' };
+  return { ok: true, value: Math.floor(n) };
+}
+
+function parsePrincipalType(raw: unknown): PrincipalType | undefined {
+  if (typeof raw !== 'string' || !raw) return undefined;
+  if (!VALID_PRINCIPAL_TYPES.has(raw)) return undefined;
+  return raw as PrincipalType;
+}
+
+function pickString(raw: unknown, maxLen = 256): string | undefined {
+  if (typeof raw !== 'string') return undefined;
+  const trimmed = raw.trim();
+  if (!trimmed) return undefined;
+  return trimmed.slice(0, maxLen);
+}
+
+function escapeCsvCell(value: string): string {
+  if (value === '') return '';
+  const guarded = FORMULA_PREFIX.test(value) ? `'${value}` : value;
+  if (/[",\n\r]/.test(guarded)) {
+    return `"${guarded.replace(/"/g, '""')}"`;
+  }
+  return guarded;
+}
+
+const CSV_COLUMNS: ReadonlyArray<{ key: keyof AdminAuditLogEntryWire; label: string }> = [
+  { key: 'timestamp', label: 'Timestamp' },
+  { key: 'action', label: 'Action' },
+  { key: 'actorName', label: 'Actor' },
+  { key: 'actorId', label: 'Actor ID' },
+  { key: 'targetPrincipalType', label: 'Target type' },
+  { key: 'targetPrincipalId', label: 'Target ID' },
+  { key: 'targetName', label: 'Target' },
+  { key: 'capability', label: 'Capability' },
+];
+
+function formatCsvHeader(): string {
+  return CSV_COLUMNS.map((c) => escapeCsvCell(c.label)).join(',');
+}
+
+function formatCsvRow(entry: AdminAuditLogEntryWire): string {
+  return CSV_COLUMNS.map((c) => escapeCsvCell(String(entry[c.key] ?? ''))).join(',');
+}
+
+interface ParsedFilters {
+  search?: string;
+  action?: AuditAction[];
+  from?: Date;
+  to?: Date;
+  actorId?: string;
+  targetPrincipalType?: PrincipalType;
+  targetPrincipalId?: string;
+  capability?: string;
+}
+
+function parseFilters(
+  query: Record<string, unknown>,
+): { ok: true; value: ParsedFilters } | { ok: false; error: string } {
+  const from = parseIsoDate(query.from);
+  if (!from.ok) return { ok: false, error: `from: ${from.error}` };
+  const to = parseIsoDate(query.to);
+  if (!to.ok) return { ok: false, error: `to: ${to.error}` };
+  return {
+    ok: true,
+    value: {
+      search: pickString(query.search, 200),
+      action: parseActionFilter(query.action),
+      from: from.value,
+      to: to.value,
+      actorId: pickString(query.actorId, 128),
+      targetPrincipalType: parsePrincipalType(query.targetPrincipalType),
+      targetPrincipalId: pickString(query.targetPrincipalId, 128),
+      capability: pickString(query.capability, 256),
+    },
+  };
+}
+
+export function createAdminAuditLogHandlers(deps: AdminAuditLogDeps) {
+  const { listAuditLogPage, findAuditLogEntry, streamAuditLogEntries } = deps;
+
+  async function listAuditLogHandler(req: ServerRequest, res: Response) {
+    try {
+      const caller = resolveCaller(req);
+      if (!caller) return res.status(401).json({ error: 'Authentication required' });
+
+      const filters = parseFilters(req.query as Record<string, unknown>);
+      if (!filters.ok) return res.status(400).json({ error: filters.error });
+
+      const cursor = pickString((req.query as Record<string, unknown>).cursor, 256);
+      const limitResult = parseLimit((req.query as Record<string, unknown>).limit);
+      if (!limitResult.ok) return res.status(400).json({ error: limitResult.error });
+
+      const page = await listAuditLogPage(caller.tenantId, {
+        ...filters.value,
+        cursor,
+        limit: limitResult.value,
+      });
+
+      return res.status(200).json(page);
+    } catch (err) {
+      logger.error('[adminAuditLog] list error:', err);
+      return res.status(500).json({ error: 'Failed to fetch audit log' });
+    }
+  }
+
+  async function getAuditLogEntryHandler(req: ServerRequest, res: Response) {
+    try {
+      const caller = resolveCaller(req);
+      if (!caller) return res.status(401).json({ error: 'Authentication required' });
+
+      const { id } = req.params as { id?: string };
+      if (!id || !OBJECT_ID_RE.test(id)) {
+        return res.status(400).json({ error: 'Invalid id' });
+      }
+
+      const entry = await findAuditLogEntry(caller.tenantId, id);
+      if (!entry) return res.status(404).json({ error: 'Not found' });
+      return res.status(200).json({ entry });
+    } catch (err) {
+      logger.error('[adminAuditLog] get error:', err);
+      return res.status(500).json({ error: 'Failed to fetch audit log entry' });
+    }
+  }
+
+  async function exportAuditLogCsvHandler(req: ServerRequest, res: Response) {
+    try {
+      const caller = resolveCaller(req);
+      if (!caller) return res.status(401).json({ error: 'Authentication required' });
+
+      const filters = parseFilters(req.query as Record<string, unknown>);
+      if (!filters.ok) return res.status(400).json({ error: filters.error });
+
+      const filenameStamp = new Date().toISOString().slice(0, 10);
+      res.setHeader('Content-Type', 'text/csv; charset=utf-8');
+      res.setHeader(
+        'Content-Disposition',
+        `attachment; filename="audit-log-${filenameStamp}.csv"`,
+      );
+      res.setHeader('Cache-Control', 'no-store');
+
+      res.write(CSV_BOM);
+      res.write(formatCsvHeader());
+      res.write('\r\n');
+
+      await streamAuditLogEntries(caller.tenantId, filters.value, (entry) => {
+        res.write(formatCsvRow(entry));
+        res.write('\r\n');
+      });
+
+      res.end();
+    } catch (err) {
+      logger.error('[adminAuditLog] export error:', err);
+      if (!res.headersSent) {
+        return res.status(500).json({ error: 'Failed to export audit log' });
+      }
+      res.end();
+    }
+  }
+
+  return {
+    listAuditLog: listAuditLogHandler,
+    getAuditLogEntry: getAuditLogEntryHandler,
+    exportAuditLogCsv: exportAuditLogCsvHandler,
+  };
+}
+
+export type ResolveAuditNamesInput = {
+  caller: { userId: string; role: string; tenantId?: string };
+  targetPrincipalType: PrincipalType;
+  targetPrincipalId: string;
+};
+
+export type AuditNameResolution = {
+  actorId: string | Types.ObjectId;
+  actorName: string;
+  targetName: string;
+};
diff --git a/packages/api/src/admin/grants.ts b/packages/api/src/admin/grants.ts
index f5d42ce071..f9e3ef5d4d 100644
--- a/packages/api/src/admin/grants.ts
+++ b/packages/api/src/admin/grants.ts
@@ -72,6 +72,19 @@ export interface AdminGrantsDeps {
     tenantId?: string;
   }) => ResolvedPrincipal[] | undefined;
   checkRoleExists?: (roleId: string) => Promise<boolean>;
+  /** Optional audit emission. Failure is logged but does not roll back the grant. */
+  recordAuditEntry?: (input: {
+    action: 'grant_assigned' | 'grant_removed';
+    actorId: string | Types.ObjectId;
+    actorName: string;
+    targetPrincipalType: PrincipalType;
+    targetPrincipalId: string | Types.ObjectId;
+    targetName: string;
+    capability: string;
+    tenantId?: string;
+  }) => Promise<unknown>;
+  /** Resolves a User document's display name from its id (for audit actor name). */
+  resolveUserName?: (userId: string | Types.ObjectId) => Promise<string | null>;
 }
 
 /** Currently ROLE-only; Record/Set structure preserved for future principal-type expansion. */
@@ -97,8 +110,39 @@ export function createAdminGrantsHandlers(deps: AdminGrantsDeps): {
     getHeldCapabilities,
     getCachedPrincipals,
     checkRoleExists,
+    recordAuditEntry,
+    resolveUserName,
   } = deps;
 
+  async function emitAudit(args: {
+    action: 'grant_assigned' | 'grant_removed';
+    caller: { userId: string; role: string; tenantId?: string };
+    principalType: PrincipalType;
+    principalId: string;
+    capability: SystemCapability;
+  }): Promise<void> {
+    if (!recordAuditEntry) return;
+    try {
+      const actorName = resolveUserName ? (await resolveUserName(args.caller.userId)) ?? args.caller.userId : args.caller.userId;
+      // For ROLE principals the principalId IS the human-readable name; for USER/GROUP
+      // the same string is the id, and the display name lookup happens in a later iteration.
+      const targetName = args.principalId;
+      await recordAuditEntry({
+        action: args.action,
+        actorId: args.caller.userId,
+        actorName,
+        targetPrincipalType: args.principalType,
+        targetPrincipalId: args.principalId,
+        targetName,
+        capability: args.capability,
+        tenantId: args.caller.tenantId,
+      });
+    } catch (err) {
+      // Audit failure must not roll back the grant — log and move on.
+      logger.error('[adminGrants] audit write failed', err);
+    }
+  }
+
   const MANAGE_CAPABILITY_BY_TYPE: Record<GrantPrincipalType, SystemCapability> = {
     [PrincipalType.ROLE]: SystemCapabilities.MANAGE_ROLES,
   };
@@ -352,6 +396,13 @@ export function createAdminGrantsHandlers(deps: AdminGrantsDeps): {
       if (!grant) {
         return res.status(500).json({ error: 'Grant operation returned no result' });
       }
+      await emitAudit({
+        action: 'grant_assigned',
+        caller,
+        principalType,
+        principalId,
+        capability,
+      });
       return res.status(201).json({ grant });
     } catch (error) {
       logger.error('[adminGrants] assignGrant error:', error);
@@ -398,6 +449,13 @@ export function createAdminGrantsHandlers(deps: AdminGrantsDeps): {
         capability: capability as SystemCapability,
         tenantId,
       });
+      await emitAudit({
+        action: 'grant_removed',
+        caller,
+        principalType: principalType as PrincipalType,
+        principalId,
+        capability: capability as SystemCapability,
+      });
       return res.status(200).json({ success: true });
     } catch (error) {
       logger.error('[adminGrants] revokeGrant error:', error);
diff --git a/packages/api/src/admin/index.ts b/packages/api/src/admin/index.ts
index 90f826d7bf..52f0d68e71 100644
--- a/packages/api/src/admin/index.ts
+++ b/packages/api/src/admin/index.ts
@@ -4,9 +4,11 @@ export { createAdminGroupsHandlers } from './groups';
 export { createAdminRolesHandlers } from './roles';
 export { createAdminSkillsSyncAccess, createAdminSkillsSyncHandlers } from './skills';
 export { createAdminUsersHandlers } from './users';
+export { createAdminAuditLogHandlers } from './auditLog';
 export type { AdminConfigDeps } from './config';
 export type { AdminGrantsDeps, GrantPrincipalType } from './grants';
 export type { AdminGroupsDeps } from './groups';
 export type { AdminRolesDeps } from './roles';
 export type { AdminSkillSyncAccessDeps, AdminSkillSyncDeps } from './skills';
 export type { AdminUsersDeps } from './users';
+export type { AdminAuditLogDeps } from './auditLog';
diff --git a/packages/data-schemas/src/methods/auditLog.ts b/packages/data-schemas/src/methods/auditLog.ts
new file mode 100644
index 0000000000..f36bc6a87d
--- /dev/null
+++ b/packages/data-schemas/src/methods/auditLog.ts
@@ -0,0 +1,245 @@
+import { PrincipalType } from 'librechat-data-provider';
+import type { FilterQuery, Model, Types } from 'mongoose';
+import type { AuditAction, IAuditLog } from '~/types';
+import logger from '~/config/winston';
+
+const DEFAULT_LIMIT = 100;
+const MAX_LIMIT = 500;
+const MAX_SEARCH_LENGTH = 200;
+
+export interface RecordAuditEntryInput {
+  action: AuditAction;
+  actorId: string | Types.ObjectId;
+  actorName: string;
+  targetPrincipalType: PrincipalType;
+  targetPrincipalId: string | Types.ObjectId;
+  targetName: string;
+  capability: string;
+  tenantId?: string;
+}
+
+export interface AuditLogFilters {
+  search?: string;
+  action?: AuditAction[];
+  from?: Date;
+  to?: Date;
+  actorId?: string;
+  targetPrincipalType?: PrincipalType;
+  targetPrincipalId?: string;
+  capability?: string;
+  cursor?: string;
+  limit?: number;
+}
+
+export interface AuditLogPage {
+  entries: AdminAuditLogEntryWire[];
+  nextCursor: string | null;
+}
+
+/**
+ * Wire shape returned to admin clients. `_id` is mapped to `id`, ObjectIds are
+ * stringified, dates are ISO strings.
+ */
+export interface AdminAuditLogEntryWire {
+  id: string;
+  action: AuditAction;
+  actorId: string;
+  actorName: string;
+  targetPrincipalType: PrincipalType;
+  targetPrincipalId: string;
+  targetName: string;
+  capability: string;
+  timestamp: string;
+}
+
+export interface AuditLogMethods {
+  recordAuditEntry: (input: RecordAuditEntryInput) => Promise<IAuditLog | null>;
+  listAuditLogPage: (
+    tenantId: string | undefined,
+    filters: AuditLogFilters,
+  ) => Promise<AuditLogPage>;
+  findAuditLogEntry: (
+    tenantId: string | undefined,
+    id: string,
+  ) => Promise<AdminAuditLogEntryWire | null>;
+  streamAuditLogEntries: (
+    tenantId: string | undefined,
+    filters: Omit<AuditLogFilters, 'cursor' | 'limit'>,
+    onEntry: (entry: AdminAuditLogEntryWire) => void | Promise<void>,
+  ) => Promise<number>;
+}
+
+function escapeRegex(input: string): string {
+  return input.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
+function toWire(doc: IAuditLog): AdminAuditLogEntryWire {
+  return {
+    id: doc._id.toString(),
+    action: doc.action,
+    actorId: doc.actorId.toString(),
+    actorName: doc.actorName,
+    targetPrincipalType: doc.targetPrincipalType,
+    targetPrincipalId: doc.targetPrincipalId.toString(),
+    targetName: doc.targetName,
+    capability: doc.capability,
+    timestamp: doc.createdAt.toISOString(),
+  };
+}
+
+function encodeCursor(id: Types.ObjectId): string {
+  return Buffer.from(id.toString(), 'utf8').toString('base64url');
+}
+
+function decodeCursor(cursor: string): string | null {
+  try {
+    const decoded = Buffer.from(cursor, 'base64url').toString('utf8');
+    if (!/^[a-fA-F0-9]{24}$/.test(decoded)) return null;
+    return decoded;
+  } catch {
+    return null;
+  }
+}
+
+function tenantFilter(tenantId?: string): FilterQuery<IAuditLog> {
+  return tenantId != null ? { tenantId } : { tenantId: { $exists: false } };
+}
+
+function buildFilter(
+  tenantId: string | undefined,
+  filters: AuditLogFilters,
+): FilterQuery<IAuditLog> {
+  const query: FilterQuery<IAuditLog> = { ...tenantFilter(tenantId) };
+
+  if (filters.action && filters.action.length > 0) {
+    query.action = filters.action.length === 1 ? filters.action[0] : { $in: filters.action };
+  }
+  if (filters.actorId) {
+    query.actorId = filters.actorId;
+  }
+  if (filters.targetPrincipalType) {
+    query.targetPrincipalType = filters.targetPrincipalType;
+  }
+  if (filters.targetPrincipalId) {
+    query.targetPrincipalId = filters.targetPrincipalId;
+  }
+  if (filters.capability) {
+    query.capability = filters.capability;
+  }
+  if (filters.from || filters.to) {
+    query.createdAt = {};
+    if (filters.from) (query.createdAt as Record<string, Date>).$gte = filters.from;
+    if (filters.to) (query.createdAt as Record<string, Date>).$lte = filters.to;
+  }
+  if (filters.search && filters.search.length > 0) {
+    const trimmed = filters.search.slice(0, MAX_SEARCH_LENGTH);
+    const safe = escapeRegex(trimmed);
+    query.$or = [
+      { actorName: { $regex: safe, $options: 'i' } },
+      { targetName: { $regex: safe, $options: 'i' } },
+      { capability: { $regex: safe, $options: 'i' } },
+    ];
+  }
+
+  return query;
+}
+
+function clampLimit(limit?: number): number {
+  if (!limit || Number.isNaN(limit) || limit < 1) return DEFAULT_LIMIT;
+  return Math.min(Math.floor(limit), MAX_LIMIT);
+}
+
+export function createAuditLogMethods(mongoose: typeof import('mongoose')): AuditLogMethods {
+  async function recordAuditEntry(input: RecordAuditEntryInput): Promise<IAuditLog | null> {
+    const AuditLog = mongoose.models.AuditLog as Model<IAuditLog>;
+    try {
+      const doc = await AuditLog.create({
+        action: input.action,
+        actorId: input.actorId,
+        actorName: input.actorName,
+        targetPrincipalType: input.targetPrincipalType,
+        targetPrincipalId: input.targetPrincipalId,
+        targetName: input.targetName,
+        capability: input.capability,
+        ...(input.tenantId != null && { tenantId: input.tenantId }),
+      });
+      return doc;
+    } catch (err) {
+      logger.error(
+        '[auditLog] failed to record audit entry',
+        { action: input.action, capability: input.capability, tenantId: input.tenantId },
+        err,
+      );
+      return null;
+    }
+  }
+
+  async function listAuditLogPage(
+    tenantId: string | undefined,
+    filters: AuditLogFilters,
+  ): Promise<AuditLogPage> {
+    const AuditLog = mongoose.models.AuditLog as Model<IAuditLog>;
+    const limit = clampLimit(filters.limit);
+    const query = buildFilter(tenantId, filters);
+
+    if (filters.cursor) {
+      const cursorId = decodeCursor(filters.cursor);
+      if (cursorId) {
+        query._id = { $lt: cursorId };
+      }
+    }
+
+    const rows = await AuditLog.find(query)
+      .sort({ createdAt: -1, _id: -1 })
+      .limit(limit + 1)
+      .lean<IAuditLog[]>();
+
+    const hasMore = rows.length > limit;
+    const page = hasMore ? rows.slice(0, limit) : rows;
+    const last = page[page.length - 1];
+    const nextCursor = hasMore && last ? encodeCursor(last._id) : null;
+
+    return {
+      entries: page.map(toWire),
+      nextCursor,
+    };
+  }
+
+  async function findAuditLogEntry(
+    tenantId: string | undefined,
+    id: string,
+  ): Promise<AdminAuditLogEntryWire | null> {
+    if (!/^[a-fA-F0-9]{24}$/.test(id)) return null;
+    const AuditLog = mongoose.models.AuditLog as Model<IAuditLog>;
+    const query: FilterQuery<IAuditLog> = { _id: id, ...tenantFilter(tenantId) };
+    const doc = await AuditLog.findOne(query).lean<IAuditLog>();
+    return doc ? toWire(doc) : null;
+  }
+
+  async function streamAuditLogEntries(
+    tenantId: string | undefined,
+    filters: Omit<AuditLogFilters, 'cursor' | 'limit'>,
+    onEntry: (entry: AdminAuditLogEntryWire) => void | Promise<void>,
+  ): Promise<number> {
+    const AuditLog = mongoose.models.AuditLog as Model<IAuditLog>;
+    const query = buildFilter(tenantId, filters);
+    const cursor = AuditLog.find(query)
+      .sort({ createdAt: -1, _id: -1 })
+      .lean<IAuditLog>()
+      .cursor({ batchSize: 500 });
+
+    let count = 0;
+    for await (const doc of cursor) {
+      await onEntry(toWire(doc as IAuditLog));
+      count++;
+    }
+    return count;
+  }
+
+  return {
+    recordAuditEntry,
+    listAuditLogPage,
+    findAuditLogEntry,
+    streamAuditLogEntries,
+  };
+}
diff --git a/packages/data-schemas/src/methods/index.ts b/packages/data-schemas/src/methods/index.ts
index 9ea9e5f1e5..3b73c100fe 100644
--- a/packages/data-schemas/src/methods/index.ts
+++ b/packages/data-schemas/src/methods/index.ts
@@ -20,6 +20,14 @@ import { createAccessRoleMethods, type AccessRoleMethods } from './accessRole';
 import { createUserGroupMethods, type UserGroupMethods } from './userGroup';
 import { createAclEntryMethods, permissionBitSupersets, type AclEntryMethods } from './aclEntry';
 import { createSystemGrantMethods, type SystemGrantMethods } from './systemGrant';
+import {
+  createAuditLogMethods,
+  type AuditLogMethods,
+  type AuditLogFilters,
+  type AuditLogPage,
+  type AdminAuditLogEntryWire,
+  type RecordAuditEntryInput,
+} from './auditLog';
 import { createShareMethods, type ShareMethods } from './share';
 /* Tier 1 — Simple CRUD */
 import { createActionMethods, type ActionMethods } from './action';
@@ -115,6 +123,7 @@ export type AllMethods = UserMethods &
   UserGroupMethods &
   AclEntryMethods &
   SystemGrantMethods &
+  AuditLogMethods &
   ShareMethods &
   AccessRoleMethods &
   PluginAuthMethods &
@@ -242,6 +251,7 @@ export function createMethods(
     ...createUserGroupMethods(mongoose),
     ...aclEntryMethods,
     ...systemGrantMethods,
+    ...createAuditLogMethods(mongoose),
     ...createShareMethods(mongoose),
     ...createPluginAuthMethods(mongoose),
     /* Tier 1 */
@@ -284,6 +294,11 @@ export type {
   UserGroupMethods,
   AclEntryMethods,
   SystemGrantMethods,
+  AuditLogMethods,
+  AuditLogFilters,
+  AuditLogPage,
+  AdminAuditLogEntryWire,
+  RecordAuditEntryInput,
   ShareMethods,
   AccessRoleMethods,
   PluginAuthMethods,
diff --git a/packages/data-schemas/src/models/auditLog.ts b/packages/data-schemas/src/models/auditLog.ts
new file mode 100644
index 0000000000..c078fac632
--- /dev/null
+++ b/packages/data-schemas/src/models/auditLog.ts
@@ -0,0 +1,14 @@
+import type * as t from '~/types';
+import auditLogSchema from '~/schema/auditLog';
+
+/**
+ * AuditLog is an append-only compliance record of SystemGrant changes.
+ *
+ * Like SystemGrant, the tenant-isolation plugin is intentionally not applied:
+ * the audit listing/export queries explicitly compose the tenantId filter
+ * from the JWT-resolved caller, and platform-level entries (admin operating
+ * outside any tenant context) use `{ tenantId: { $exists: false } }`.
+ */
+export function createAuditLogModel(mongoose: typeof import('mongoose')) {
+  return mongoose.models.AuditLog || mongoose.model<t.IAuditLog>('AuditLog', auditLogSchema);
+}
diff --git a/packages/data-schemas/src/models/index.ts b/packages/data-schemas/src/models/index.ts
index 476091ec9c..69140db4fa 100644
--- a/packages/data-schemas/src/models/index.ts
+++ b/packages/data-schemas/src/models/index.ts
@@ -24,6 +24,7 @@ import { createBannerModel } from './banner';
 import { createPresetModel } from './preset';
 import { createPromptModel } from './prompt';
 import { createMemoryModel } from './memory';
+import { createAuditLogModel } from './auditLog';
 import { createConfigModel } from './config';
 import { createTokenModel } from './token';
 import { createAgentModel } from './agent';
@@ -71,6 +72,7 @@ export function createModels(mongoose: typeof import('mongoose')): {
   AccessRole: ReturnType<typeof createAccessRoleModel>;
   AclEntry: ReturnType<typeof createAclEntryModel>;
   SystemGrant: ReturnType<typeof createSystemGrantModel>;
+  AuditLog: ReturnType<typeof createAuditLogModel>;
   Group: ReturnType<typeof createGroupModel>;
   Config: ReturnType<typeof createConfigModel>;
 } {
@@ -108,6 +110,7 @@ export function createModels(mongoose: typeof import('mongoose')): {
     AccessRole: createAccessRoleModel(mongoose),
     AclEntry: createAclEntryModel(mongoose),
     SystemGrant: createSystemGrantModel(mongoose),
+    AuditLog: createAuditLogModel(mongoose),
     Group: createGroupModel(mongoose),
     Config: createConfigModel(mongoose),
   };
diff --git a/packages/data-schemas/src/schema/auditLog.ts b/packages/data-schemas/src/schema/auditLog.ts
new file mode 100644
index 0000000000..ed4833100f
--- /dev/null
+++ b/packages/data-schemas/src/schema/auditLog.ts
@@ -0,0 +1,68 @@
+import { Schema } from 'mongoose';
+import { PrincipalType } from 'librechat-data-provider';
+import type { IAuditLog } from '~/types';
+
+const auditLogSchema = new Schema<IAuditLog>(
+  {
+    action: {
+      type: String,
+      enum: ['grant_assigned', 'grant_removed'],
+      required: true,
+    },
+    actorId: {
+      type: Schema.Types.ObjectId,
+      ref: 'User',
+      required: true,
+    },
+    actorName: {
+      type: String,
+      required: true,
+    },
+    targetPrincipalType: {
+      type: String,
+      enum: Object.values(PrincipalType),
+      required: true,
+    },
+    /**
+     * Mixed: ObjectId for USER/GROUP principals, role-name string for ROLE.
+     * Normalization (string → ObjectId for USER/GROUP) is the responsibility
+     * of the writer (HTTP handler), mirroring the SystemGrant convention.
+     */
+    targetPrincipalId: {
+      type: Schema.Types.Mixed,
+      required: true,
+    },
+    targetName: {
+      type: String,
+      required: true,
+    },
+    capability: {
+      type: String,
+      required: true,
+    },
+    /**
+     * Platform-level audit entries MUST omit this field entirely — never set
+     * it to null. Queries for platform-level entries use
+     * `{ tenantId: { $exists: false } }`, which matches absent fields but NOT
+     * `null`. A document stored with `{ tenantId: null }` would silently match
+     * neither platform-level nor tenant-scoped queries.
+     */
+    tenantId: {
+      type: String,
+      required: false,
+      validate: {
+        validator: (v: unknown) => v !== null && v !== '',
+        message: 'tenantId must be a non-empty string or omitted entirely — never null or empty',
+      },
+    },
+  },
+  { timestamps: true },
+);
+
+/** Primary listing: tenant + newest-first + tiebreak on _id for keyset pagination. */
+auditLogSchema.index({ tenantId: 1, createdAt: -1, _id: -1 });
+
+/** Target facet: filter by who was affected. */
+auditLogSchema.index({ tenantId: 1, targetPrincipalType: 1, targetPrincipalId: 1, createdAt: -1 });
+
+export default auditLogSchema;
diff --git a/packages/data-schemas/src/schema/index.ts b/packages/data-schemas/src/schema/index.ts
index 0dfd4dcb30..08471bf5c8 100644
--- a/packages/data-schemas/src/schema/index.ts
+++ b/packages/data-schemas/src/schema/index.ts
@@ -28,4 +28,5 @@ export { default as userSchema } from './user';
 export { default as memorySchema } from './memory';
 export { default as groupSchema } from './group';
 export { default as systemGrantSchema } from './systemGrant';
+export { default as auditLogSchema } from './auditLog';
 export { default as configSchema } from './config';
diff --git a/packages/data-schemas/src/types/auditLog.ts b/packages/data-schemas/src/types/auditLog.ts
new file mode 100644
index 0000000000..f9dd172d46
--- /dev/null
+++ b/packages/data-schemas/src/types/auditLog.ts
@@ -0,0 +1,27 @@
+import type { Document, Types } from 'mongoose';
+import type { PrincipalType } from 'librechat-data-provider';
+
+export type AuditAction = 'grant_assigned' | 'grant_removed';
+
+export type AuditLog = {
+  action: AuditAction;
+  actorId: Types.ObjectId;
+  actorName: string;
+  targetPrincipalType: PrincipalType;
+  /** ObjectId for USER/GROUP, role name string for ROLE */
+  targetPrincipalId: string | Types.ObjectId;
+  targetName: string;
+  capability: string;
+  /** Absent = platform-operator audit; present = tenant-scoped audit */
+  tenantId?: string;
+  /** Mongoose auto-managed via { timestamps: true } */
+  createdAt?: Date;
+  updatedAt?: Date;
+};
+
+export type IAuditLog = AuditLog &
+  Document & {
+    _id: Types.ObjectId;
+    createdAt: Date;
+    updatedAt: Date;
+  };
diff --git a/packages/data-schemas/src/types/index.ts b/packages/data-schemas/src/types/index.ts
index da4f42c435..3dc5228532 100644
--- a/packages/data-schemas/src/types/index.ts
+++ b/packages/data-schemas/src/types/index.ts
@@ -31,6 +31,7 @@ export * from './skillSync';
 export * from './accessRole';
 export * from './aclEntry';
 export * from './systemGrant';
+export * from './auditLog';
 export * from './group';
 /* Config */
 export * from './config';