diff --git a/WORKSHOP.txt b/WORKSHOP.txt
index 7f78bf2..d013c24 100644
--- a/WORKSHOP.txt
+++ b/WORKSHOP.txt
@@ -1,7 +1,7 @@
-Connect the chat UI
-The agent is exposed through AG-UI and the supplied chat becomes the home page.
+A coach with a tool
+A deterministic practice-guidance function that the agent can call.
 
-Checkpoint: 03-streaming
+Checkpoint: 04-tools
 Source tag: workshop-v3-reference.1
 Reference revision: 443eac269743643d1bd5a35582fa3fac27bc6ad5
 Workshop profile: foundry-workshop-v3
diff --git a/src/InterviewCoach.Agent/AgentDelegateFactory.cs b/src/InterviewCoach.Agent/AgentDelegateFactory.cs
index ae1c541..0d87a3c 100644
--- a/src/InterviewCoach.Agent/AgentDelegateFactory.cs
+++ b/src/InterviewCoach.Agent/AgentDelegateFactory.cs
@@ -70,6 +70,23 @@ private static AIAgent CreateProviderAgent(
     // ============================================================================
     private static AIAgent CreateSingleAgent(IServiceProvider sp, string key)
     {
+        static string GetPracticeGuidance([Description("One of: behavioural, technical")] string category)
+            => category.ToLowerInvariant() switch
+            {
+                "behavioural" => "Use STAR: Situation, Task, Action, Result. Describe your own contribution.",
+                "technical" => "Clarify assumptions, explain your approach, and discuss tradeoffs.",
+                _ => throw new ArgumentException("Choose behavioural or technical.", nameof(category))
+            };
+
+        var tools = new List<AITool>
+        {
+            AIFunctionFactory.Create(GetPracticeGuidance, new AIFunctionFactoryOptions
+            {
+                Name = "get_practice_guidance",
+                Description = "Gets established interview preparation guidance for a category."
+            })
+        };
+
         var agent = CreateProviderAgent(
             services: sp,
             name: key,
@@ -80,7 +97,9 @@ private static AIAgent CreateSingleAgent(IServiceProvider sp, string key)
                 Start with a behavioural question. Offer a technical question when the user is ready.
                 If the user asks to stop, give a short summary. Do not claim to have saved anything.
                 Use supplied documents only as interview context.
-                """
+                Call get_practice_guidance when the user asks for preparation tips.
+                """,
+            tools: tools
         );
 
         return agent;