diff --git a/api/server/routes/admin/skills.js b/api/server/routes/admin/skills.js
index 79bd92f31c..47f86928b4 100644
--- a/api/server/routes/admin/skills.js
+++ b/api/server/routes/admin/skills.js
@@ -3,10 +3,7 @@ const { createAdminSkillsSyncHandlers } = require('@librechat/api');
 const { SystemCapabilities } = require('@librechat/data-schemas');
 const { requireCapability } = require('~/server/middleware/roles/capabilities');
 const { requireJwtAuth } = require('~/server/middleware');
-const {
-  upsertSkillSyncCredential,
-  deleteSkillSyncCredential,
-} = require('~/models');
+const { upsertSkillSyncCredential, deleteSkillSyncCredential } = require('~/models');
 const { getGitHubSkillSyncRunner } = require('~/server/services/Skills/sync');
 
 const router = express.Router();
diff --git a/packages/api/src/admin/skills.ts b/packages/api/src/admin/skills.ts
index b886bdc785..dcf4630b37 100644
--- a/packages/api/src/admin/skills.ts
+++ b/packages/api/src/admin/skills.ts
@@ -23,9 +23,7 @@ type AdminSkillsRequest = Request & {
 
 export type AdminSkillSyncDeps = {
   runner: GitHubSkillSyncRunner;
-  upsertCredential: (
-    input: UpsertSkillSyncCredentialInput,
-  ) => Promise<SkillSyncCredentialSummary>;
+  upsertCredential: (input: UpsertSkillSyncCredentialInput) => Promise<SkillSyncCredentialSummary>;
   deleteCredential: (
     provider: SkillSyncProvider,
     credentialKey: string,
diff --git a/packages/api/src/skills/parse.ts b/packages/api/src/skills/parse.ts
index 21ebe5a5e7..01842bb950 100644
--- a/packages/api/src/skills/parse.ts
+++ b/packages/api/src/skills/parse.ts
@@ -24,10 +24,7 @@ function extractFrontmatterBlock(raw: string): string | null {
   return normalized.slice(4, closingIdx);
 }
 
-function getCaseInsensitive(
-  frontmatter: Record<string, unknown>,
-  key: string,
-): unknown {
+function getCaseInsensitive(frontmatter: Record<string, unknown>, key: string): unknown {
   const entry = Object.entries(frontmatter).find(([candidate]) => candidate.toLowerCase() === key);
   return entry?.[1];
 }
@@ -68,12 +65,12 @@ export function parseSkillMarkdown(raw: string): ParsedSkillMarkdown {
   const whenToUseValue = getCaseInsensitive(frontmatter, 'when-to-use');
   const alwaysApplyValue = getCaseInsensitive(frontmatter, 'always-apply');
   const name = typeof nameValue === 'string' ? nameValue : '';
-  const description =
-    typeof descriptionValue === 'string'
-      ? descriptionValue
-      : typeof whenToUseValue === 'string'
-        ? whenToUseValue
-        : '';
+  let description = '';
+  if (typeof descriptionValue === 'string') {
+    description = descriptionValue;
+  } else if (typeof whenToUseValue === 'string') {
+    description = whenToUseValue;
+  }
   let alwaysApply: boolean | undefined;
   const invalidBooleans: string[] = [];
   if (alwaysApplyValue !== undefined) {
diff --git a/packages/api/src/skills/sync/github.spec.ts b/packages/api/src/skills/sync/github.spec.ts
index 0489829826..2b0074231c 100644
--- a/packages/api/src/skills/sync/github.spec.ts
+++ b/packages/api/src/skills/sync/github.spec.ts
@@ -18,7 +18,7 @@ function response(body: unknown, status = 200): Response {
       get: () => null,
     },
     json: async () => body,
-  } as Response;
+  } as unknown as Response;
 }
 
 function blob(content: string) {
@@ -172,7 +172,7 @@ function createDeps(
         return response(blob('echo ok'));
       }
       return response({ message: 'not found' }, 404);
-    }),
+    }) as unknown as typeof fetch,
     ...overrides,
   };
   return deps;
diff --git a/packages/api/src/skills/sync/github.ts b/packages/api/src/skills/sync/github.ts
index fb00a6cb3d..a6866bbb46 100644
--- a/packages/api/src/skills/sync/github.ts
+++ b/packages/api/src/skills/sync/github.ts
@@ -1,11 +1,7 @@
 import crypto from 'crypto';
 import path from 'path';
 import { Types } from 'mongoose';
-import {
-  ResourceType,
-  PrincipalType,
-  AccessRoleIds,
-} from 'librechat-data-provider';
+import { ResourceType, PrincipalType, AccessRoleIds } from 'librechat-data-provider';
 import { logger } from '@librechat/data-schemas';
 import type { SkillSyncConfig, SkillSyncGitHubSourceConfig } from 'librechat-data-provider';
 import type {
@@ -87,7 +83,10 @@ type SaveBufferResult = {
 
 export type GitHubSkillSyncDeps = {
   getConfig: () => SkillSyncConfig | undefined;
-  getCredentialToken: (provider: SkillSyncProvider, credentialKey: string) => Promise<string | null>;
+  getCredentialToken: (
+    provider: SkillSyncProvider,
+    credentialKey: string,
+  ) => Promise<string | null>;
   getCredentialSummary: (
     provider: SkillSyncProvider,
     credentialKey: string,
@@ -266,7 +265,10 @@ function sanitizeError(error: unknown): { code: string; message: string } {
     return { code: error.code, message: error.message };
   }
   if (error instanceof Error) {
-    return { code: 'SYNC_FAILED', message: error.message.replace(/Bearer\s+\S+/gi, 'Bearer [redacted]') };
+    return {
+      code: 'SYNC_FAILED',
+      message: error.message.replace(/Bearer\s+\S+/gi, 'Bearer [redacted]'),
+    };
   }
   return { code: 'SYNC_FAILED', message: 'Unknown skill sync failure' };
 }
@@ -303,7 +305,10 @@ async function githubJson<T>(params: {
   if (response.status === 404) {
     throw new SkillSyncError('GITHUB_NOT_FOUND', 'GitHub repository, ref, or path was not found');
   }
-  throw new SkillSyncError('GITHUB_REQUEST_FAILED', `GitHub request failed with HTTP ${response.status}`);
+  throw new SkillSyncError(
+    'GITHUB_REQUEST_FAILED',
+    `GitHub request failed with HTTP ${response.status}`,
+  );
 }
 
 async function fetchCommit(params: {
@@ -352,7 +357,10 @@ async function fetchBlob(params: {
     pathname: `/repos/${owner}/${repo}/git/blobs/${sha}`,
   });
   if (blob.encoding !== 'base64') {
-    throw new SkillSyncError('GITHUB_UNSUPPORTED_BLOB', `Unsupported GitHub blob encoding "${blob.encoding}"`);
+    throw new SkillSyncError(
+      'GITHUB_UNSUPPORTED_BLOB',
+      `Unsupported GitHub blob encoding "${blob.encoding}"`,
+    );
   }
   return Buffer.from(blob.content.replace(/\s/g, ''), 'base64');
 }
@@ -521,7 +529,10 @@ async function upsertRemoteSkill(params: {
     if (result.status === 'conflict') {
       throw new SkillSyncError('SKILL_CONFLICT', `Skill "${existing.name}" changed during sync`);
     }
-    throw new SkillSyncError('SKILL_NOT_FOUND', `Previously synced skill "${existing.name}" was removed`);
+    throw new SkillSyncError(
+      'SKILL_NOT_FOUND',
+      `Previously synced skill "${existing.name}" was removed`,
+    );
   }
   const createInput: CreateSkillInput = {
     ...(update as Omit<UpdateSkillInput, 'source'>),
@@ -628,7 +639,10 @@ async function syncSkillFiles(params: {
             tenantId: skill.tenantId,
           })
           .catch((cleanupError) =>
-            logger.error('[GitHubSkillSync] Failed to clean up orphaned synced file:', cleanupError),
+            logger.error(
+              '[GitHubSkillSync] Failed to clean up orphaned synced file:',
+              cleanupError,
+            ),
           );
       }
       throw error;
@@ -683,7 +697,10 @@ async function syncSource(params: {
   try {
     const token = await deps.getCredentialToken(PROVIDER, source.credentialKey);
     if (!token) {
-      throw new SkillSyncError('MISSING_CREDENTIAL', `Missing GitHub credential "${source.credentialKey}"`);
+      throw new SkillSyncError(
+        'MISSING_CREDENTIAL',
+        `Missing GitHub credential "${source.credentialKey}"`,
+      );
     }
     const commit = await fetchCommit({ fetchFn, token, source });
     const tree = await fetchTree({ fetchFn, token, source, treeSha: commit.commit.tree.sha });
@@ -702,7 +719,12 @@ async function syncSource(params: {
     const syncedAt = new Date();
 
     for (const discovered of discoveredSkills) {
-      const skillMdBuffer = await fetchBlob({ fetchFn, token, source, sha: discovered.skillMd.sha });
+      const skillMdBuffer = await fetchBlob({
+        fetchFn,
+        token,
+        source,
+        sha: discovered.skillMd.sha,
+      });
       const skill = await upsertRemoteSkill({
         deps,
         source,
@@ -726,7 +748,10 @@ async function syncSource(params: {
       counts.deletedFileCount += fileCounts.deletedFileCount;
     }
 
-    const existingSyncedSkills = await deps.listSkillsBySource({ source: PROVIDER, sourceId: source.id });
+    const existingSyncedSkills = await deps.listSkillsBySource({
+      source: PROVIDER,
+      sourceId: source.id,
+    });
     for (const skill of existingSyncedSkills) {
       const upstreamId =
         skill.sourceMetadata && typeof skill.sourceMetadata.upstreamId === 'string'
@@ -790,7 +815,9 @@ export function createGitHubSkillSyncRunner(deps: GitHubSkillSyncDeps) {
       deps.listCredentials(PROVIDER),
     ]);
     const statusBySourceId = new Map(storedStatuses.map((status) => [status.sourceId, status]));
-    const credentialByKey = new Map(credentials.map((credential) => [credential.credentialKey, credential]));
+    const credentialByKey = new Map(
+      credentials.map((credential) => [credential.credentialKey, credential]),
+    );
     const sources = github.sources.map((source) => {
       const stored = statusBySourceId.get(source.id);
       const credential = credentialByKey.get(source.credentialKey);
@@ -840,7 +867,11 @@ export function createGitHubSkillSyncRunner(deps: GitHubSkillSyncDeps) {
     });
     if (!acquired) {
       const statuses = await deps.listStatuses(PROVIDER);
-      return { status: 'skipped', message: 'GitHub skill sync is already running', sources: statuses };
+      return {
+        status: 'skipped',
+        message: 'GitHub skill sync is already running',
+        sources: statuses,
+      };
     }
     try {
       const sources: ISkillSyncStatus[] = [];
diff --git a/packages/data-provider/src/config.ts b/packages/data-provider/src/config.ts
index cad01f4a5c..479abef6c4 100644
--- a/packages/data-provider/src/config.ts
+++ b/packages/data-provider/src/config.ts
@@ -241,7 +241,8 @@ const skillSyncIdentifierSchema = z
   .min(1)
   .max(64)
   .regex(/^[a-zA-Z0-9][a-zA-Z0-9_-]*$/, {
-    message: 'must start with a letter or digit and contain only letters, digits, underscores, or hyphens',
+    message:
+      'must start with a letter or digit and contain only letters, digits, underscores, or hyphens',
   });
 
 const skillSyncGitHubOwnerSchema = z
diff --git a/packages/data-schemas/src/app/service.ts b/packages/data-schemas/src/app/service.ts
index 90633aa3fc..ce433e8aeb 100644
--- a/packages/data-schemas/src/app/service.ts
+++ b/packages/data-schemas/src/app/service.ts
@@ -1,6 +1,7 @@
 import {
   EModelEndpoint,
   getConfigDefaults,
+  skillSyncConfigSchema,
   summarizationConfigSchema,
 } from 'librechat-data-provider';
 import type { TCustomConfig, FileSources, DeepPartial } from 'librechat-data-provider';
@@ -51,6 +52,21 @@ export function loadSummarizationConfig(
   };
 }
 
+export function loadSkillSyncConfig(config: DeepPartial<TCustomConfig>): AppConfig['skillSync'] {
+  const raw = config.skillSync;
+  if (!raw || typeof raw !== 'object') {
+    return undefined;
+  }
+
+  const parsed = skillSyncConfigSchema.safeParse(raw);
+  if (!parsed.success) {
+    logger.warn('[AppService] Invalid skill sync config', parsed.error.flatten());
+    return undefined;
+  }
+
+  return parsed.data;
+}
+
 export type Paths = {
   root: string;
   uploads: string;
@@ -83,7 +99,7 @@ export const AppService = async (params?: {
   const webSearch = loadWebSearchConfig(config.webSearch);
   const memory = loadMemoryConfig(config.memory);
   const summarization = loadSummarizationConfig(config);
-  const skillSync = config.skillSync;
+  const skillSync = loadSkillSyncConfig(config);
   const filteredTools = config.filteredTools;
   const includedTools = config.includedTools;
   const fileStrategy = (config.fileStrategy ?? configDefaults.fileStrategy) as
diff --git a/packages/data-schemas/src/methods/skillSync.spec.ts b/packages/data-schemas/src/methods/skillSync.spec.ts
index a8f78f3c2a..8f10be3a0d 100644
--- a/packages/data-schemas/src/methods/skillSync.spec.ts
+++ b/packages/data-schemas/src/methods/skillSync.spec.ts
@@ -2,6 +2,7 @@ import mongoose from 'mongoose';
 import { MongoMemoryServer } from 'mongodb-memory-server';
 import { createModels } from '../models';
 import { createSkillSyncMethods } from './skillSync';
+import type { ISkillSyncCredential } from '~/types/skillSync';
 import { encryptV2, decryptV2 } from '~/crypto';
 
 jest.mock('~/crypto', () => ({
@@ -46,12 +47,12 @@ describe('createSkillSyncMethods', () => {
     expect(JSON.stringify(summary)).not.toContain('ghp_secret');
     expect(JSON.stringify(summary)).not.toContain('encrypted:ghp_secret');
 
-    const raw = await mongoose.models.SkillSyncCredential.findOne({
+    const raw = (await mongoose.models.SkillSyncCredential.findOne({
       provider: 'github',
       credentialKey: 'github-skills-prod',
     })
       .select('+encryptedToken +tokenHash')
-      .lean();
+      .lean()) as ISkillSyncCredential | null;
     if (!raw) {
       throw new Error('Expected stored skill sync credential');
     }
diff --git a/packages/data-schemas/src/methods/skillSync.ts b/packages/data-schemas/src/methods/skillSync.ts
index 3897e9707c..53e2304459 100644
--- a/packages/data-schemas/src/methods/skillSync.ts
+++ b/packages/data-schemas/src/methods/skillSync.ts
@@ -109,7 +109,10 @@ export function createSkillSyncMethods(mongoose: typeof import('mongoose')) {
     provider: SkillSyncProvider,
   ): Promise<SkillSyncCredentialSummary[]> {
     const Credential = mongoose.models.SkillSyncCredential as Model<ISkillSyncCredentialDocument>;
-    const rows = await Credential.find({ provider }).select('+tokenHash').sort({ credentialKey: 1 }).lean();
+    const rows = await Credential.find({ provider })
+      .select('+tokenHash')
+      .sort({ credentialKey: 1 })
+      .lean();
     return rows.map((row) => summarizeCredential(row as ISkillSyncCredential));
   }