updated skill to write builder code in readme

Author: soheimam

docs/ai-agents/guides/builder-codes.mdx

@@ -41,7 +41,7 @@ Response:
 }
 ```
 
-**Idempotent** — calling it again with the same wallet address returns the same builder code.
+**Already registered?** Calling this endpoint again with the same wallet address returns your existing builder code — safe to call multiple times.
 
 ---
 
@@ -74,9 +74,6 @@ Then ask your agent: **"Register my agent for a builder code on Base.dev."**
 The skill runs four phases:
 
 <Steps>
-  <Step title="Pre-check">
-    Looks for an existing `builderCode.ts` in your project. If found, registration is already done and the skill exits early.
-  </Step>
   <Step title="Wallet">
     Asks for your agent's wallet address. If you don't have one, it sends you to the [wallet setup guide](/ai-agents/guides/wallet-setup) before continuing.
   </Step>
@@ -119,6 +116,6 @@ No authentication required.
 |---|---|---|---|
 | `wallet_address` | string | Yes | Your agent's EVM wallet address (`0x...`) |
 
-Returns the builder code for the given wallet. Idempotent — the same wallet always returns the same code.
+Returns the builder code for the given wallet. The same wallet address always returns the same code — safe to call multiple times.