diff --git a/hub/.env.example b/hub/.env.example
index 73d9d30..32ed939 100644
--- a/hub/.env.example
+++ b/hub/.env.example
@@ -3,16 +3,11 @@
 # PostgreSQL connection string.
 DATABASE_URL="postgresql://paradigm:paradigm@127.0.0.1:5432/paradigm"
 
-# OpenRouter API key — used as ANTHROPIC_AUTH_TOKEN for Claude Code SDK.
-# OpenRouter's "Anthropic Skin" (https://openrouter.ai/api) is Anthropic-API
-# compatible, so Claude Code SDK speaks its native protocol directly.
-# Get one at https://openrouter.ai/keys
-OPENROUTER_API_KEY=""
-
-# Claude Code SDK auth — derived from OpenRouter. Do NOT set ANTHROPIC_API_KEY
-# to a real value; it must be explicitly empty to avoid auth conflicts.
+# Claude Code SDK auth via OpenRouter's Anthropic Skin.
+# ANTHROPIC_AUTH_TOKEN = your OpenRouter API key (https://openrouter.ai/keys)
+# ANTHROPIC_API_KEY must be explicitly empty to avoid auth conflicts.
 ANTHROPIC_BASE_URL="https://openrouter.ai/api"
-ANTHROPIC_AUTH_TOKEN=""  # Set to same value as OPENROUTER_API_KEY
+ANTHROPIC_AUTH_TOKEN=""
 ANTHROPIC_API_KEY=""
 
 # Model override (optional). Defaults to Claude Sonnet. To use GLM:
diff --git a/hub/src/server.ts b/hub/src/server.ts
index 56b183a..798f675 100644
--- a/hub/src/server.ts
+++ b/hub/src/server.ts
@@ -30,12 +30,10 @@ async function main(): Promise<void> {
   const databaseUrl = requireEnv("DATABASE_URL");
   void databaseUrl;
 
-  // Claude Code SDK auth via OpenRouter's Anthropic Skin. The SDK reads
-  // ANTHROPIC_BASE_URL + ANTHROPIC_AUTH_TOKEN from env. ANTHROPIC_API_KEY
-  // must be explicitly empty to avoid auth conflicts.
-  const openrouterKey = requireEnv("OPENROUTER_API_KEY");
+  // Claude Code SDK auth via OpenRouter's Anthropic Skin.
+  // ANTHROPIC_AUTH_TOKEN = OpenRouter API key; ANTHROPIC_API_KEY must be empty.
+  requireEnv("ANTHROPIC_AUTH_TOKEN");
   process.env["ANTHROPIC_BASE_URL"] ??= "https://openrouter.ai/api";
-  process.env["ANTHROPIC_AUTH_TOKEN"] ??= openrouterKey;
   process.env["ANTHROPIC_API_KEY"] ??= "";
   const feishuAppId = requireEnv("FEISHU_APP_ID");
   const feishuAppSecret = requireEnv("FEISHU_APP_SECRET");