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build-with-claude/prompt-caching.md

Changed on 2026-03-04 18:25:37 EST

Unified Diff

--- a/build-with-claude/prompt-caching.md
+++ b/build-with-claude/prompt-caching.md
@@ -873,7 +873,7 @@
 console.log(response);
 ```
 
-```csharp C#
+```csharp C# hidelines={1..9,-1}
 using System;
 using System.Threading.Tasks;
 using System.Collections.Generic;
@@ -1236,7 +1236,7 @@
 console.log(response);
 ```
 
-```csharp C#
+```csharp C# hidelines={1..9,-1}
 using System;
 using System.Text.Json;
 using System.Threading.Tasks;
@@ -1725,7 +1725,7 @@
 console.log(response);
 ```
 
-```csharp C#
+```csharp C# hidelines={1..5}
 using Anthropic;
 using Anthropic.Models.Messages;
 using System.Collections.Generic;
@@ -2288,7 +2288,7 @@
 console.log(response);
 ```
 
-```csharp C#
+```csharp C# hidelines={1..10,-1}
 using System;
 using System.Collections.Generic;
 using System.Text.Json;
@@ -2362,7 +2362,7 @@
                     {
                         new ContentBlockParam(new ToolUseBlockParam()
                         {
-                            Id = "tool_1",
+                            ID = "tool_1",
                             Name = "search_documents",
                             Input = JsonSerializer.SerializeToElement(new { query = "Mars rovers" }),
                         }),
@@ -3018,7 +3018,8 @@
 
   This error typically appears when you have upgraded your SDK or you are using outdated code examples. Prompt caching is now generally available, so you no longer need the beta prefix. Instead of:
     <CodeGroup>
-      ```python
+      
+      ```python Python nocheck
       client.beta.prompt_caching.messages.create(**params)
       ```
 
@@ -3072,7 +3073,8 @@
     </CodeGroup>
     Simply use:
     <CodeGroup>
-      ```python
+      
+      ```python Python nocheck
       client.messages.create(**params)
       ```
 
@@ -3122,8 +3124,7 @@
       echo $message->content[0]->text;
       ```
 
-      
-      ```ruby Ruby nocheck
+      ```ruby Ruby
       require "anthropic"
 
       client = Anthropic::Client.new
@@ -3131,8 +3132,15 @@
       message = client.messages.create(
         model: "claude-opus-4-6",
         max_tokens: 1024,
+        system: [
+          {
+            type: "text",
+            text: "You are an expert on this large document...",
+            cache_control: { type: "ephemeral" }
+          }
+        ],
         messages: [
-          { role: "user", content: "Hello, Claude" }
+          { role: "user", content: "Summarize the key points" }
         ]
       )
       puts message.content.first.text