fix: remove 9 redundant env var fallbacks + add Sanity schema descriptions

Sanity config singletons are now the single source of truth for all runtime config. Env vars only used for secrets/credentials.\n\nRemoved process.env fallbacks: ELEVENLABS_VOICE_ID, REMOTION_AWS_REGION, REMOTION_SERVE_URL, REMOTION_FUNCTION_NAME, GCS_BUCKET, GCS_PROJECT_ID, GEMINI_MODEL (x2), YOUTUBE_UPLOAD_VISIBILITY\n\nAdded descriptions to all 30+ fields across 6 Sanity config schemas.\n\nAlso includes revalidateTag fix for Next.js 16 (requires 2 args).

Author: codercatdev

app/api/webhooks/sanity-revalidate/route.ts

@@ -25,7 +25,8 @@ export async function POST(request: NextRequest) {
 
 		// Revalidate all sanity-tagged caches (the "heavy hammer" approach)
 		// This is a backup for when no visitors are active to trigger SanityLive revalidation
-		revalidateTag("sanity");
+		// Next.js 16 requires a second argument — { expire: 0 } for immediate invalidation
+		revalidateTag("sanity", { expire: 0 });
 
 		return NextResponse.json({
 			revalidated: true,

lib/gemini.ts

@@ -1,4 +1,5 @@
 import { GoogleGenerativeAI } from "@google/generative-ai";
+import { getConfigValue } from "@/lib/config";
 
 const genAI = new GoogleGenerativeAI(process.env.GEMINI_API_KEY || "");
 
@@ -12,8 +13,9 @@ export async function generateWithGemini(
 	prompt: string,
 	systemInstruction?: string,
 ): Promise<string> {
+	const geminiModel = await getConfigValue("pipeline_config", "geminiModel", "gemini-2.0-flash");
 	const model = genAI.getGenerativeModel({
-		model: process.env.GEMINI_MODEL || "gemini-2.5-flash",
+		model: geminiModel,
 		...(systemInstruction && { systemInstruction }),
 	});
 	const result = await model.generateContent(prompt);

lib/services/elevenlabs.ts

@@ -67,7 +67,7 @@ async function getElevenLabsConfig(): Promise<ElevenLabsConfig> {
   const apiKey = process.env.ELEVENLABS_API_KEY;
   const voiceId = await getConfigValue(
     "pipeline_config", "elevenLabsVoiceId",
-    process.env.ELEVENLABS_VOICE_ID || "pNInz6obpgDQGcFmaJgB"
+    "pNInz6obpgDQGcFmaJgB"
   );
 
   if (!apiKey) {

lib/services/gcs.ts

@@ -5,11 +5,11 @@
  * Authenticates via service account JWT → OAuth2 access token exchange.
  *
  * Requires env vars:
- * - GCS_BUCKET
- * - GCS_PROJECT_ID
  * - GCS_CLIENT_EMAIL
  * - GCS_PRIVATE_KEY
  *
+ * GCS bucket and project config is read from Sanity singletons via getConfigValue().
+ *
  * @module lib/services/gcs
  */
 
@@ -58,27 +58,30 @@ const TOKEN_REFRESH_MARGIN_MS = 5 * 60 * 1000; // 5 minutes
 // ---------------------------------------------------------------------------
 
 /**
- * Get GCS configuration from environment variables.
- * Throws if any required env var is missing.
+ * Get GCS configuration from Sanity config + environment variables.
+ * Bucket and project ID come from Sanity; credentials from env vars.
+ * Throws if any required value is missing.
  *
  * The private key may contain literal `\\n` sequences from the env var;
  * these are converted to real newline characters.
  */
 export async function getGCSConfig(): Promise<GCSConfig> {
-  const bucket = await getConfigValue("gcs_config", "bucketName", process.env.GCS_BUCKET);
-  const projectId = await getConfigValue("gcs_config", "projectId", process.env.GCS_PROJECT_ID);
+  const bucket = await getConfigValue("gcs_config", "bucketName", "codingcatdev-content-engine");
+  const projectId = await getConfigValue("gcs_config", "projectId", "codingcatdev");
   const clientEmail = process.env.GCS_CLIENT_EMAIL;
   let privateKey = process.env.GCS_PRIVATE_KEY;
 
   if (!bucket || !projectId || !clientEmail || !privateKey) {
     const missing = [
-      !bucket && "GCS_BUCKET",
-      !projectId && "GCS_PROJECT_ID",
+      !bucket && "gcs_config.bucketName",
+      !projectId && "gcs_config.projectId",
       !clientEmail && "GCS_CLIENT_EMAIL",
       !privateKey && "GCS_PRIVATE_KEY",
     ].filter(Boolean);
     throw new Error(
-      `[GCS] Missing required environment variables: ${missing.join(", ")}`
+      `[GCS] Missing required configuration: ${missing.join(", ")}. ` +
+        `Bucket and project ID are managed in the Sanity GCS Config singleton. ` +
+        `Credentials (GCS_CLIENT_EMAIL, GCS_PRIVATE_KEY) come from env vars.`
     );
   }
 

lib/services/remotion.ts

@@ -10,9 +10,9 @@
  * Requires env vars:
  * - AWS_ACCESS_KEY_ID
  * - AWS_SECRET_ACCESS_KEY
- * - REMOTION_AWS_REGION
- * - REMOTION_SERVE_URL (generated during Lambda deployment)
- * - REMOTION_FUNCTION_NAME (optional, defaults to DEFAULT_FUNCTION_NAME)
+ *
+ * Remotion-specific config (region, serveUrl, functionName) is read from
+ * Sanity singletons via getConfigValue().
  *
  * @module lib/services/remotion
  */
@@ -76,7 +76,7 @@ export interface RenderResult {
 // Constants
 // ---------------------------------------------------------------------------
 
-/** Default Lambda function name if REMOTION_FUNCTION_NAME is not set */
+/** Default Lambda function name if not configured in Sanity */
 const DEFAULT_FUNCTION_NAME = "remotion-render-4-0-431";
 
 /** Polling interval in ms when waiting for render completion */
@@ -128,26 +128,28 @@ function mapInputProps(input: RenderInput): Record<string, unknown> {
 // ---------------------------------------------------------------------------
 
 /**
- * Get Remotion Lambda configuration from environment variables.
- * Throws if any required env var is missing.
+ * Get Remotion Lambda configuration from Sanity config + environment variables.
+ * AWS credentials come from env vars; Remotion-specific config from Sanity.
+ * Throws if any required value is missing.
  */
 export async function getRemotionConfig(): Promise<RemotionLambdaConfig> {
   const awsAccessKeyId = process.env.AWS_ACCESS_KEY_ID;
   const awsSecretAccessKey = process.env.AWS_SECRET_ACCESS_KEY;
-  const region = await getConfigValue("remotion_config", "awsRegion", process.env.REMOTION_AWS_REGION);
-  const serveUrl = await getConfigValue("remotion_config", "serveUrl", process.env.REMOTION_SERVE_URL);
+  const region = await getConfigValue("remotion_config", "awsRegion", "us-east-1");
+  const serveUrl = await getConfigValue("remotion_config", "serveUrl", undefined);
 
   const missing: string[] = [];
   if (!awsAccessKeyId) missing.push("AWS_ACCESS_KEY_ID");
   if (!awsSecretAccessKey) missing.push("AWS_SECRET_ACCESS_KEY");
-  if (!region) missing.push("REMOTION_AWS_REGION");
-  if (!serveUrl) missing.push("REMOTION_SERVE_URL");
+  if (!region) missing.push("remotion_config.awsRegion");
+  if (!serveUrl) missing.push("remotion_config.serveUrl");
 
   if (missing.length > 0) {
     throw new Error(
-      `[REMOTION] Missing required environment variables: ${missing.join(", ")}. ` +
-        `Set these before calling any render function. ` +
-        `REMOTION_SERVE_URL is generated by running deployRemotionLambda().`
+      `[REMOTION] Missing required configuration: ${missing.join(", ")}. ` +
+        `AWS credentials come from env vars. Remotion config (region, serveUrl, functionName) ` +
+        `is managed in the Sanity Remotion Config singleton. ` +
+        `serveUrl is generated by running deployRemotionLambda().`
     );
   }
 
@@ -160,10 +162,10 @@ export async function getRemotionConfig(): Promise<RemotionLambdaConfig> {
 }
 
 /**
- * Get the Lambda function name from env or use the default.
+ * Get the Lambda function name from Sanity config or use the default.
  */
 async function getFunctionName(): Promise<string> {
-  return getConfigValue("remotion_config", "functionName", process.env.REMOTION_FUNCTION_NAME || DEFAULT_FUNCTION_NAME);
+  return getConfigValue("remotion_config", "functionName", "remotion-render-4-0-431-mem2048mb-disk2048mb-240sec");
 }
 
 // ---------------------------------------------------------------------------
@@ -239,7 +241,7 @@ async function startRender(
     throw new Error(
       `[REMOTION] Failed to trigger Lambda render for "${composition}": ${message}. ` +
         `Ensure the Lambda function "${functionName}" is deployed in ${region} ` +
-        `and REMOTION_SERVE_URL points to a valid Remotion bundle.`
+        `and the Remotion Config serveUrl points to a valid Remotion bundle.`
     );
   }
 }

lib/sponsor/gemini-intent.ts

@@ -1,4 +1,5 @@
 import { GoogleGenerativeAI } from '@google/generative-ai'
+import { getConfigValue } from '@/lib/config'
 
 const SPONSORSHIP_TIERS = [
   'dedicated-video',
@@ -33,8 +34,9 @@ export async function extractSponsorIntent(message: string): Promise<SponsorInte
     }
   }
 
+  const geminiModel = await getConfigValue('pipeline_config', 'geminiModel', 'gemini-2.0-flash')
   const genAI = new GoogleGenerativeAI(apiKey)
-  const model = genAI.getGenerativeModel({ model: process.env.GEMINI_MODEL || 'gemini-2.5-flash' })
+  const model = genAI.getGenerativeModel({ model: geminiModel })
 
   const prompt = `You are analyzing an inbound sponsorship inquiry for CodingCat.dev, a developer education platform with YouTube videos, podcasts, blog posts, and newsletters.
 

lib/youtube-upload.ts

@@ -1,5 +1,6 @@
 import { google } from "googleapis";
 import { Readable } from "node:stream";
+import { getConfigValue } from "@/lib/config";
 
 const oauth2Client = new google.auth.OAuth2(
 	process.env.YOUTUBE_CLIENT_ID,
@@ -11,12 +12,12 @@ oauth2Client.setCredentials({
 
 const youtube = google.youtube({ version: "v3", auth: oauth2Client });
 
-function getDefaultPrivacyStatus(): "public" | "private" | "unlisted" {
-	const envValue = process.env.YOUTUBE_UPLOAD_VISIBILITY?.toLowerCase();
-	if (envValue === "public" || envValue === "private" || envValue === "unlisted") {
-		return envValue;
+async function getDefaultPrivacyStatus(): Promise<"public" | "private" | "unlisted"> {
+	const value = await getConfigValue("pipeline_config", "youtubeUploadVisibility", "private");
+	if (value === "public" || value === "private" || value === "unlisted") {
+		return value;
 	}
-	return "private"; // Default to private when not set
+	return "private"; // Default to private when not set or invalid
 }
 
 interface UploadOptions {
@@ -36,7 +37,7 @@ export async function uploadVideo(opts: UploadOptions): Promise<{ videoId: strin
 	const response = await fetch(opts.videoUrl);
 	if (!response.ok) throw new Error(`Failed to fetch video: ${response.statusText}`);
 
-	const resolvedPrivacyStatus = opts.privacyStatus || getDefaultPrivacyStatus();
+	const resolvedPrivacyStatus = opts.privacyStatus || await getDefaultPrivacyStatus();
 	console.log(`[youtube-upload] Uploading "${opts.title.slice(0, 60)}" with privacy: ${resolvedPrivacyStatus}`);
 	// Convert Web ReadableStream to Node.js Readable stream
 	// googleapis expects a Node.js stream with .pipe(), not a Web ReadableStream

sanity/schemas/singletons/contentConfig.ts

@@ -10,6 +10,7 @@ export default defineType({
       name: "rssFeeds",
       title: "RSS Feeds",
       type: "array",
+      description: "RSS/Atom feeds to monitor for trending topics. The ingest cron checks these daily for new content ideas",
       of: [
         {
           type: "object",
@@ -42,6 +43,7 @@ export default defineType({
       name: "trendSourcesEnabled",
       title: "Trend Sources Enabled",
       type: "object",
+      description: "Toggle individual trend discovery sources on/off. Disabling a source skips it during the daily ingest scan",
       fields: [
         defineField({
           name: "hn",
@@ -79,24 +81,28 @@ export default defineType({
       name: "systemInstruction",
       title: "System Instruction",
       type: "text",
+      description: "The AI system prompt used for script generation. Defines the writing style, tone, and format for all generated video scripts",
       initialValue: "You are a content strategist and scriptwriter for CodingCat.dev, a web development education channel run by Alex Patterson.\n\nYour style is inspired by Cleo Abram's \"Huge If True\" — you make complex technical topics feel exciting, accessible, and important. Key principles:\n- Start with a BOLD claim or surprising fact that makes people stop scrolling\n- Use analogies and real-world comparisons to explain technical concepts\n- Build tension: \"Here's the problem... here's why it matters... here's the breakthrough\"\n- Keep energy HIGH — short sentences, active voice, conversational tone\n- End with a clear takeaway that makes the viewer feel smarter\n- Target audience: developers who want to stay current but don't have time to read everything\n\nScript format: 60-90 second explainer videos. Think TikTok/YouTube Shorts energy with real educational depth.\n\nCodingCat.dev covers: React, Next.js, TypeScript, Svelte, web APIs, CSS, Node.js, cloud services, AI/ML for developers, and web platform updates.",
     }),
     defineField({
       name: "targetVideoDurationSec",
       title: "Target Video Duration (sec)",
       type: "number",
+      description: "Target duration for generated videos in seconds. Scripts are calibrated to this length",
       initialValue: 90,
     }),
     defineField({
       name: "sceneCountMin",
       title: "Scene Count Min",
       type: "number",
+      description: "Minimum number of scenes per video. The AI generates at least this many visual segments",
       initialValue: 3,
     }),
     defineField({
       name: "sceneCountMax",
       title: "Scene Count Max",
       type: "number",
+      description: "Maximum number of scenes per video. Keeps videos focused and within duration targets",
       initialValue: 5,
     }),
   ],

sanity/schemas/singletons/distributionConfig.ts

@@ -10,26 +10,30 @@ export default defineType({
       name: "notificationEmails",
       title: "Notification Emails",
       type: "array",
+      description: "Email addresses that receive notifications when a new video is published",
       of: [{ type: "string" }],
       initialValue: ["alex@codingcat.dev"],
     }),
     defineField({
       name: "youtubeDescriptionTemplate",
       title: "YouTube Description Template",
       type: "text",
+      description: "Template for YouTube video descriptions. Use {{title}} and {{summary}} placeholders",
       initialValue: "{{title}}\n\n{{summary}}\n\n🔗 Learn more at https://codingcat.dev\n\n#webdev #coding #programming",
     }),
     defineField({
       name: "youtubeDefaultTags",
       title: "YouTube Default Tags",
       type: "array",
+      description: "Default tags applied to all uploaded YouTube videos. Topic-specific tags are added by AI",
       of: [{ type: "string" }],
       initialValue: ["web development", "coding", "programming", "tutorial", "codingcat"],
     }),
     defineField({
       name: "resendFromEmail",
       title: "Resend From Email",
       type: "string",
+      description: "Sender email address for notification emails via Resend",
       initialValue: "content@codingcat.dev",
     }),
   ],

sanity/schemas/singletons/gcsConfig.ts

@@ -10,12 +10,14 @@ export default defineType({
       name: "bucketName",
       title: "Bucket Name",
       type: "string",
+      description: "Google Cloud Storage bucket name for storing video assets, audio files, and renders",
       initialValue: "codingcatdev-content-engine",
     }),
     defineField({
       name: "projectId",
       title: "Project ID",
       type: "string",
+      description: "Google Cloud project ID that owns the GCS bucket",
       initialValue: "codingcatdev",
     }),
   ],