diff --git a/packages/api/src/agents/index.ts b/packages/api/src/agents/index.ts
index dd414940c1..779f76de33 100644
--- a/packages/api/src/agents/index.ts
+++ b/packages/api/src/agents/index.ts
@@ -27,6 +27,7 @@ export * from './legacy';
 export * from './lazySubagents';
 export * from './lazyHistory';
 export * from './memory';
+export * from './management';
 export * from './mcpIdentity';
 export * from './orphans';
 export * from './migration';
diff --git a/packages/api/src/agents/management.spec.ts b/packages/api/src/agents/management.spec.ts
new file mode 100644
index 0000000000..68a4232c17
--- /dev/null
+++ b/packages/api/src/agents/management.spec.ts
@@ -0,0 +1,218 @@
+import { z } from 'zod';
+import { MAX_SUBAGENTS, setMaxSubagents } from 'librechat-data-provider';
+import {
+  agentManagementCreateSchema,
+  agentManagementListResponseSchema,
+  agentManagementListSchema,
+  agentManagementResponseSchema,
+  agentManagementUpdateSchema,
+  mapAgentManagementError,
+  projectAgentManagementListResponse,
+  projectAgentManagementResponse,
+} from './management';
+
+const timestamps = {
+  createdAt: new Date('2026-09-01T10:00:00.000Z'),
+  updatedAt: new Date('2026-09-02T10:00:00.000Z'),
+};
+
+const persistedAgent = {
+  _id: '64da00000000000000000001',
+  id: 'agent_public_id',
+  tenantId: 'tenant-secret',
+  author: 'user-secret',
+  credentials: { apiKey: 'secret' },
+  versions: [{}, {}],
+  mcpServerNames: ['private-routing-name'],
+  is_promoted: true,
+  name: 'Researcher',
+  description: 'Finds primary sources',
+  instructions: 'Be precise',
+  provider: 'openAI',
+  model: 'gpt-5',
+  model_parameters: { temperature: 0.2 },
+  tools: ['web_search'],
+  skills: ['64da00000000000000000002'],
+  conversation_starters: ['Research this'],
+  ...timestamps,
+};
+
+describe('Agent Management contract', () => {
+  describe('inputs', () => {
+    it('keeps create and update fields aligned with the browser Agent validators', () => {
+      expect(
+        agentManagementCreateSchema.parse({
+          provider: 'openAI',
+          model: 'gpt-5',
+          name: 'Researcher',
+          stateful_code_environment: 'agent-user',
+          subagents: { enabled: true, allowSelf: true, agent_ids: [] },
+        }),
+      ).toMatchObject({ provider: 'openAI', model: 'gpt-5', tools: [] });
+
+      expect(
+        agentManagementUpdateSchema.parse({
+          instructions: 'Updated',
+          model_parameters: { temperature: 0.1 },
+          code_environment_id: null,
+        }),
+      ).toEqual({
+        instructions: 'Updated',
+        model_parameters: { temperature: 0.1 },
+        code_environment_id: null,
+      });
+    });
+
+    it.each([agentManagementCreateSchema, agentManagementUpdateSchema])(
+      'rejects unknown and read-only fields',
+      (schema) => {
+        const base =
+          schema === agentManagementCreateSchema ? { provider: 'openAI', model: 'gpt-5' } : {};
+        expect(schema.safeParse({ ...base, _id: '64da00000000000000000001' }).success).toBe(false);
+        expect(schema.safeParse({ ...base, id: 'agent_forged' }).success).toBe(false);
+        expect(schema.safeParse({ ...base, tenantId: 'tenant_forged' }).success).toBe(false);
+        expect(schema.safeParse({ ...base, credentials: { apiKey: 'secret' } }).success).toBe(
+          false,
+        );
+        expect(schema.safeParse({ ...base, versions: [] }).success).toBe(false);
+      },
+    );
+  });
+
+  describe('pagination', () => {
+    const cursor = Buffer.from(
+      JSON.stringify({
+        updatedAt: '2026-09-02T10:00:00.000Z',
+        _id: '64da00000000000000000001',
+      }),
+    ).toString('base64');
+
+    it('normalizes a bounded limit and accepts the opaque database cursor', () => {
+      expect(agentManagementListSchema.parse({ limit: '25', cursor })).toEqual({
+        limit: 25,
+        cursor,
+      });
+      expect(agentManagementListSchema.parse({})).toEqual({ limit: 20 });
+    });
+
+    it.each([
+      { limit: 0 },
+      { limit: 101 },
+      { limit: 1.5 },
+      { cursor: 'not-a-cursor' },
+      {
+        cursor: Buffer.from(JSON.stringify({ updatedAt: 'nope', _id: 'nope' })).toString('base64'),
+      },
+      { search: 'unsupported' },
+    ])('rejects invalid list input %#', (input) => {
+      expect(agentManagementListSchema.safeParse(input).success).toBe(false);
+    });
+
+    it('projects every list item and emits only a usable next cursor', () => {
+      const response = projectAgentManagementListResponse({
+        data: [persistedAgent],
+        has_more: true,
+        after: cursor,
+      });
+
+      expect(agentManagementListResponseSchema.parse(response)).toEqual(response);
+      expect(response).toMatchObject({
+        object: 'list',
+        first_id: 'agent_public_id',
+        last_id: 'agent_public_id',
+        has_more: true,
+        after: cursor,
+      });
+      expect(
+        projectAgentManagementListResponse({ data: [], has_more: false, after: cursor }),
+      ).toEqual({
+        object: 'list',
+        data: [],
+        first_id: null,
+        last_id: null,
+        has_more: false,
+        after: null,
+      });
+
+      expect(
+        agentManagementListResponseSchema.safeParse({
+          ...response,
+          has_more: true,
+          after: null,
+        }).success,
+      ).toBe(false);
+    });
+  });
+
+  describe('responses', () => {
+    it('allowlists supported configuration and stable metadata', () => {
+      const response = projectAgentManagementResponse(persistedAgent);
+
+      expect(agentManagementResponseSchema.parse(response)).toEqual(response);
+      expect(response).toMatchObject({
+        id: 'agent_public_id',
+        version: 2,
+        createdAt: '2026-09-01T10:00:00.000Z',
+        updatedAt: '2026-09-02T10:00:00.000Z',
+        name: 'Researcher',
+        provider: 'openAI',
+        model: 'gpt-5',
+      });
+      expect(response).not.toHaveProperty('_id');
+      expect(response).not.toHaveProperty('tenantId');
+      expect(response).not.toHaveProperty('author');
+      expect(response).not.toHaveProperty('credentials');
+      expect(response).not.toHaveProperty('versions');
+      expect(response).not.toHaveProperty('mcpServerNames');
+      expect(response).not.toHaveProperty('is_promoted');
+    });
+
+    it('does not apply the current request admission limit to persisted subagents', () => {
+      const subagents = {
+        enabled: true,
+        agent_ids: Array.from({ length: MAX_SUBAGENTS }, (_, index) => `agent_${index}`),
+      };
+
+      setMaxSubagents(1);
+      try {
+        expect(agentManagementUpdateSchema.safeParse({ subagents }).success).toBe(false);
+        expect(projectAgentManagementResponse({ ...persistedAgent, subagents }).subagents).toEqual(
+          subagents,
+        );
+      } finally {
+        setMaxSubagents(undefined);
+      }
+    });
+  });
+
+  describe('errors', () => {
+    it.each([
+      ['not_found', 404, 'Agent not found'],
+      ['permission_denied', 403, 'Permission denied'],
+      ['internal_error', 500, 'Internal server error'],
+    ] as const)('maps %s without leaking an internal error', (code, status, message) => {
+      expect(mapAgentManagementError(code, new Error('database password leaked'))).toEqual({
+        status,
+        body: { error: { code, message } },
+      });
+    });
+
+    it('maps validation issues to safe paths and messages', () => {
+      const validation = z.object({ limit: z.number().max(100) }).safeParse({ limit: 101 });
+      if (validation.success) {
+        throw new Error('Expected validation to fail');
+      }
+
+      expect(mapAgentManagementError('invalid_request', validation.error)).toMatchObject({
+        status: 400,
+        body: {
+          error: {
+            code: 'invalid_request',
+            message: 'Invalid request',
+            details: [{ path: ['limit'] }],
+          },
+        },
+      });
+    });
+  });
+});
diff --git a/packages/api/src/agents/management.ts b/packages/api/src/agents/management.ts
new file mode 100644
index 0000000000..1985fcd1d0
--- /dev/null
+++ b/packages/api/src/agents/management.ts
@@ -0,0 +1,300 @@
+import { z } from 'zod';
+import type {
+  AgentSubagentGraph,
+  AgentSubagentGraphEdge,
+  AgentSubagentsConfig,
+} from 'librechat-data-provider';
+import { agentCreateSchema, agentUpdateSchema } from './validation';
+
+const MAX_LIST_LIMIT = 100;
+const DEFAULT_LIST_LIMIT = 20;
+const MAX_CURSOR_LENGTH = 512;
+
+export type AgentManagementCreate = z.output<typeof agentCreateSchema>;
+export type AgentManagementUpdate = z.output<typeof agentUpdateSchema>;
+export type AgentManagementList = {
+  limit: number;
+  cursor?: string;
+};
+export type AgentManagementResponse = Omit<
+  z.output<typeof agentUpdateSchema>,
+  'provider' | 'model'
+> & {
+  id: string;
+  provider: string;
+  model: string | null;
+  version: number;
+  createdAt: string;
+  updatedAt: string;
+};
+export type AgentManagementProjectionSource = Partial<
+  Omit<AgentManagementResponse, 'id' | 'provider' | 'model' | 'version' | 'createdAt' | 'updatedAt'>
+> & {
+  id?: string;
+  provider?: string;
+  model?: string | null;
+  version?: number;
+  versions?: readonly object[];
+  createdAt?: string | Date;
+  updatedAt?: string | Date;
+};
+export type AgentManagementListProjectionSource = {
+  data?: AgentManagementProjectionSource[];
+  has_more?: boolean;
+  after?: string | null;
+};
+export type AgentManagementListResponse = {
+  object: 'list';
+  data: AgentManagementResponse[];
+  first_id: string | null;
+  last_id: string | null;
+  has_more: boolean;
+  after: string | null;
+};
+export type AgentManagementErrorCode =
+  | 'invalid_request'
+  | 'not_found'
+  | 'permission_denied'
+  | 'internal_error';
+export type AgentManagementError = {
+  error: {
+    code: AgentManagementErrorCode;
+    message: string;
+    details?: Array<{ path: Array<string | number>; message: string }>;
+  };
+};
+
+/**
+ * Agent Management accepts the browser-supported configuration fields, but unlike the
+ * browser endpoints it rejects unknown top-level fields instead of silently stripping them.
+ */
+export const agentManagementCreateSchema: z.ZodType<
+  AgentManagementCreate,
+  z.ZodTypeDef,
+  z.input<typeof agentCreateSchema>
+> = agentCreateSchema.strict();
+export const agentManagementUpdateSchema: z.ZodType<AgentManagementUpdate> =
+  agentUpdateSchema.strict();
+
+const agentManagementCursorSchema = z
+  .string()
+  .min(1)
+  .max(MAX_CURSOR_LENGTH)
+  .superRefine((cursor, context) => {
+    try {
+      const decoded = JSON.parse(Buffer.from(cursor, 'base64').toString('utf8')) as unknown;
+      const result = z
+        .object({
+          updatedAt: z.string().datetime(),
+          _id: z.string().regex(/^[a-f\d]{24}$/i),
+        })
+        .strict()
+        .safeParse(decoded);
+
+      if (!result.success) {
+        context.addIssue({ code: z.ZodIssueCode.custom, message: 'Invalid cursor' });
+      }
+    } catch {
+      context.addIssue({ code: z.ZodIssueCode.custom, message: 'Invalid cursor' });
+    }
+  });
+
+export const agentManagementListSchema: z.ZodType<AgentManagementList, z.ZodTypeDef, unknown> = z
+  .object({
+    limit: z.coerce.number().int().min(1).max(MAX_LIST_LIMIT).default(DEFAULT_LIST_LIMIT),
+    cursor: agentManagementCursorSchema.optional(),
+  })
+  .strict();
+
+const timestampSchema = z.string().datetime();
+const agentManagementGraphEdgeResponseSchema: z.ZodType<AgentSubagentGraphEdge> = z
+  .object({
+    from: z.union([z.string(), z.array(z.string())]),
+    to: z.union([z.string(), z.array(z.string())]),
+    description: z.string().optional(),
+    edgeType: z.literal('direct'),
+    prompt: z.string().optional(),
+    excludeResults: z.boolean().optional(),
+  })
+  .strict();
+const agentManagementGraphResponseSchema: z.ZodType<AgentSubagentGraph> = z
+  .object({
+    type: z.string(),
+    name: z.string(),
+    description: z.string(),
+    agent_ids: z.array(z.string()),
+    edges: z.array(agentManagementGraphEdgeResponseSchema),
+    entry_agent_id: z.string(),
+    result_agent_id: z.string(),
+  })
+  .strict();
+const agentManagementSubagentsResponseSchema: z.ZodType<AgentSubagentsConfig | undefined> = z
+  .object({
+    enabled: z.boolean().optional(),
+    allowSelf: z.boolean().optional(),
+    agent_ids: z.array(z.string()).optional(),
+    graphs: z.array(agentManagementGraphResponseSchema).optional(),
+  })
+  .strict()
+  .optional();
+
+/** The externally supported Agent shape. Persistence and ownership fields are intentionally absent. */
+export const agentManagementResponseSchema: z.ZodType<AgentManagementResponse> = agentUpdateSchema
+  .extend({
+    id: z.string().min(1),
+    provider: z.string(),
+    model: z.string().nullable(),
+    version: z.number().int().nonnegative(),
+    createdAt: timestampSchema,
+    updatedAt: timestampSchema,
+    subagents: agentManagementSubagentsResponseSchema,
+  })
+  .strict();
+
+export const agentManagementListResponseSchema: z.ZodType<AgentManagementListResponse> = z
+  .object({
+    object: z.literal('list'),
+    data: z.array(agentManagementResponseSchema),
+    first_id: z.string().nullable(),
+    last_id: z.string().nullable(),
+    has_more: z.boolean(),
+    after: agentManagementCursorSchema.nullable(),
+  })
+  .strict()
+  .superRefine(({ has_more, after }, context) => {
+    if (has_more !== (after != null)) {
+      context.addIssue({
+        code: z.ZodIssueCode.custom,
+        path: ['after'],
+        message: 'A next cursor is required exactly when more results are available',
+      });
+    }
+  });
+
+export const agentManagementErrorCodeSchema: z.ZodType<AgentManagementErrorCode> = z.enum([
+  'invalid_request',
+  'not_found',
+  'permission_denied',
+  'internal_error',
+]);
+
+const agentManagementValidationIssueSchema = z
+  .object({
+    path: z.array(z.union([z.string(), z.number()])),
+    message: z.string(),
+  })
+  .strict();
+
+export const agentManagementErrorSchema: z.ZodType<AgentManagementError> = z
+  .object({
+    error: z
+      .object({
+        code: agentManagementErrorCodeSchema,
+        message: z.string(),
+        details: z.array(agentManagementValidationIssueSchema).optional(),
+      })
+      .strict(),
+  })
+  .strict();
+
+function toTimestamp(value: string | Date | undefined): string | undefined {
+  if (value instanceof Date) {
+    return value.toISOString();
+  }
+  return value;
+}
+
+function getVersion(source: AgentManagementProjectionSource): number | undefined {
+  if (source.version != null) {
+    return source.version;
+  }
+  return source.versions?.length;
+}
+
+/** Build an external response from a persistence result using an explicit allowlist. */
+export function projectAgentManagementResponse(
+  source: AgentManagementProjectionSource,
+): AgentManagementResponse {
+  return agentManagementResponseSchema.parse({
+    id: source.id,
+    provider: source.provider,
+    model: source.model,
+    version: getVersion(source),
+    createdAt: toTimestamp(source.createdAt),
+    updatedAt: toTimestamp(source.updatedAt),
+    name: source.name,
+    description: source.description,
+    instructions: source.instructions,
+    avatar: source.avatar,
+    model_parameters: source.model_parameters,
+    tools: source.tools,
+    skills: source.skills,
+    skills_enabled: source.skills_enabled,
+    skill_authoring_enabled: source.skill_authoring_enabled,
+    skills_scope: source.skills_scope,
+    memory_scope: source.memory_scope,
+    agent_ids: source.agent_ids,
+    edges: source.edges,
+    end_after_tools: source.end_after_tools,
+    hide_sequential_outputs: source.hide_sequential_outputs,
+    stateful_code_sessions: source.stateful_code_sessions,
+    stateful_code_environment: source.stateful_code_environment,
+    code_environment_id: source.code_environment_id,
+    artifacts: source.artifacts,
+    recursion_limit: source.recursion_limit,
+    conversation_starters: source.conversation_starters,
+    tool_resources: source.tool_resources,
+    tool_options: source.tool_options,
+    subagents: source.subagents,
+    support_contact: source.support_contact,
+    category: source.category,
+  });
+}
+
+export function projectAgentManagementListResponse(
+  source: AgentManagementListProjectionSource,
+): AgentManagementListResponse {
+  const data = (source.data ?? []).map(projectAgentManagementResponse);
+  return agentManagementListResponseSchema.parse({
+    object: 'list',
+    data,
+    first_id: data[0]?.id ?? null,
+    last_id: data[data.length - 1]?.id ?? null,
+    has_more: source.has_more,
+    after: source.has_more === true && typeof source.after === 'string' ? source.after : null,
+  });
+}
+
+const ERROR_STATUS: Record<AgentManagementErrorCode, number> = {
+  invalid_request: 400,
+  not_found: 404,
+  permission_denied: 403,
+  internal_error: 500,
+};
+
+const ERROR_MESSAGE: Record<AgentManagementErrorCode, string> = {
+  invalid_request: 'Invalid request',
+  not_found: 'Agent not found',
+  permission_denied: 'Permission denied',
+  internal_error: 'Internal server error',
+};
+
+/** Map known failure classes to a stable envelope without exposing internal error messages. */
+export function mapAgentManagementError(
+  code: AgentManagementErrorCode,
+  error?: unknown,
+): { status: number; body: AgentManagementError } {
+  const details =
+    code === 'invalid_request' && error instanceof z.ZodError
+      ? error.issues.map(({ path, message }) => ({ path, message }))
+      : undefined;
+  const body = agentManagementErrorSchema.parse({
+    error: {
+      code,
+      message: ERROR_MESSAGE[code],
+      ...(details != null ? { details } : {}),
+    },
+  });
+
+  return { status: ERROR_STATUS[code], body };
+}