Add Email Drafter Human in the loop use case

experimental/lambda/src/test/java/io/serverless/workflow/impl/FluentDSLCallTest.java

@@ -82,7 +82,7 @@ void testSwitch() throws InterruptedException, ExecutionException {
                       tasks
                           .switchCase(
                               switchOdd ->
-                                  switchOdd.functions(
+                                  switchOdd.onPredicate(
                                       item ->
                                           item.when(CallTest::isOdd).then(FlowDirectiveEnum.END)))
                           .callFn(callJava -> callJava.function(CallTest::zero)))

experimental/types/src/main/java/io/serverlessworkflow/api/types/func/EventDataFunction.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2020-Present The Serverless Workflow Specification Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.serverlessworkflow.api.types.func;
+
+import io.serverlessworkflow.api.types.EventData;
+import java.util.Objects;
+import java.util.function.Function;
+
+public class EventDataFunction extends EventData {
+
+  public <T, R> EventData withFunction(Function<T, R> value) {
+    setObject(value);
+    return this;
+  }
+
+  public <T, R> EventData withFunction(Function<T, R> value, Class<T> argClass) {
+    Objects.requireNonNull(argClass);
+    setObject(new TypedFunction<>(value, argClass));
+    return this;
+  }
+}

experimental/types/src/main/java/io/serverlessworkflow/api/types/func/EventDataPredicate.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2020-Present The Serverless Workflow Specification Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.serverlessworkflow.api.types.func;
+
+import io.serverlessworkflow.api.types.EventData;
+import java.util.Objects;
+import java.util.function.Predicate;
+
+public class EventDataPredicate extends EventData {
+
+  public <T> EventDataPredicate withPredicate(Predicate<T> predicate) {
+    setObject(predicate);
+    return this;
+  }
+
+  public <T> EventDataPredicate withPredicate(Predicate<T> predicate, Class<T> clazz) {
+    Objects.requireNonNull(clazz);
+    setObject(new TypedPredicate<>(predicate, clazz));
+    return this;
+  }
+}

fluent/agentic/pom.xml

@@ -57,6 +57,16 @@
             <artifactId>serverlessworkflow-experimental-agentic</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>io.cloudevents</groupId>
+            <artifactId>cloudevents-json-jackson</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.serverlessworkflow</groupId>
+            <artifactId>serverlessworkflow-impl-jackson</artifactId>
+            <version>${project.version}</version>
+        </dependency>
     </dependencies>
 
     <build>

fluent/agentic/src/main/java/io/serverlessworkflow/fluent/agentic/AgentListenTaskBuilder.java

@@ -18,17 +18,31 @@
 import io.serverlessworkflow.api.types.AnyEventConsumptionStrategy;
 import io.serverlessworkflow.api.types.ListenTask;
 import io.serverlessworkflow.api.types.func.UntilPredicate;
-import io.serverlessworkflow.fluent.spec.ListenTaskBuilder;
+import io.serverlessworkflow.fluent.func.FuncListenToBuilder;
+import io.serverlessworkflow.fluent.func.spi.ConditionalTaskBuilder;
+import io.serverlessworkflow.fluent.spec.AbstractListenTaskBuilder;
 import java.util.function.Predicate;
 
-public class AgentListenTaskBuilder extends ListenTaskBuilder<AgentTaskItemListBuilder> {
+public class AgentListenTaskBuilder
+    extends AbstractListenTaskBuilder<AgentTaskItemListBuilder, FuncListenToBuilder>
+    implements ConditionalTaskBuilder<AgentListenTaskBuilder> {
 
   private UntilPredicate untilPredicate;
 
   public AgentListenTaskBuilder() {
     super(new AgentTaskItemListBuilder());
   }
 
+  @Override
+  protected AgentListenTaskBuilder self() {
+    return this;
+  }
+
+  @Override
+  protected FuncListenToBuilder newEventConsumptionStrategyBuilder() {
+    return new FuncListenToBuilder();
+  }
+
   public <T> AgentListenTaskBuilder until(Predicate<T> predicate, Class<T> predClass) {
     untilPredicate = new UntilPredicate().withPredicate(predicate, predClass);
     return this;

fluent/agentic/src/test/java/io/serverlessworkflow/fluent/agentic/Agents.java

@@ -26,9 +26,9 @@ public interface Agents {
   interface ChatBot {
     @UserMessage(
         """
-            You are a happy chat bot, reply to my message:
-            {{userInput}}.
-            """)
+                        You are a happy chat bot, reply to my message:
+                        {{userInput}}.
+                        """)
     @Agent
     String chat(@V("userInput") String userInput);
   }
@@ -37,11 +37,11 @@ interface MovieExpert {
 
     @UserMessage(
         """
-                                You are a great evening planner.
-                                Propose a list of 3 movies matching the given mood.
-                                The mood is {{mood}}.
-                                Provide a list with the 3 items and nothing else.
-                                """)
+                        You are a great evening planner.
+                        Propose a list of 3 movies matching the given mood.
+                        The mood is {{mood}}.
+                        Provide a list with the 3 items and nothing else.
+                        """)
     @Agent
     List<String> findMovie(@V("mood") String mood);
   }
@@ -50,10 +50,10 @@ interface SettingAgent extends AgentSpecification {
 
     @UserMessage(
         """
-              Create a vivid  {{style}} setting. It should include the time period, the state of technology,
-              key locations, and a brief description of the world’s political or social situation.
-              Make it imaginative, atmospheric, and suitable for a {{style}}  novel.
-            """)
+                          Create a vivid  {{style}} setting. It should include the time period, the state of technology,
+                          key locations, and a brief description of the world’s political or social situation.
+                          Make it imaginative, atmospheric, and suitable for a {{style}}  novel.
+                        """)
     @Agent(
         "Generates an imaginative setting including timeline, technology level, and world structure")
     String invoke(@V("style") String style);
@@ -63,9 +63,9 @@ interface HeroAgent extends AgentSpecification {
 
     @UserMessage(
         """
-              Invent a compelling protagonist for a {{style}} story. Describe their background, personality,
-              motivations, and any unique skills or traits.
-            """)
+                          Invent a compelling protagonist for a {{style}} story. Describe their background, personality,
+                          motivations, and any unique skills or traits.
+                        """)
     @Agent("Creates a unique and relatable protagonist with rich backstory and motivations.")
     String invoke(@V("style") String style);
   }
@@ -74,10 +74,10 @@ interface ConflictAgent extends AgentSpecification {
 
     @UserMessage(
         """
-                  Generate a central conflict or threat for a {{style}} plot. It can be external or
-                  internal (e.g. moral dilemma, personal transformation).
-                  Make it high-stakes and thematically rich.
-                """)
+                          Generate a central conflict or threat for a {{style}} plot. It can be external or
+                          internal (e.g. moral dilemma, personal transformation).
+                          Make it high-stakes and thematically rich.
+                        """)
     @Agent("Proposes a central conflict or dramatic tension to drive a compelling narrative.")
     String invoke(@V("style") String style);
   }
@@ -86,8 +86,8 @@ interface FactAgent extends AgentSpecification {
 
     @UserMessage(
         """
-                  Generate a unique sci-fi fact about an alien civilization's {{goal}} environment or evolutionary history. Make it imaginative and specific.
-            """)
+                              Generate a unique sci-fi fact about an alien civilization's {{goal}} environment or evolutionary history. Make it imaginative and specific.
+                        """)
     @Agent("Generates a core fact that defines the foundation of an civilization.")
     String invoke(@V("fact") String fact);
   }
@@ -96,10 +96,10 @@ interface CultureAgent extends AgentSpecification {
 
     @UserMessage(
         """
-                  Given the following sci-fi fact about an civilization, describe 3–5 unique cultural traits, traditions, or societal structures that naturally emerge from this environment.
-                  Fact:
-                  {{fact}}
-            """)
+                              Given the following sci-fi fact about an civilization, describe 3–5 unique cultural traits, traditions, or societal structures that naturally emerge from this environment.
+                              Fact:
+                              {{fact}}
+                        """)
     @Agent("Derives cultural traits from the environmental/evolutionary fact.")
     List<String> invoke(@V("fact") String fact);
   }
@@ -108,10 +108,10 @@ interface TechnologyAgent extends AgentSpecification {
 
     @UserMessage(
         """
-                  Given the following sci-fi fact about an alien civilization, describe 3–5 technologies or engineering solutions they might have developed. Focus on tools, transportation, communication, and survival systems.
-                  Fact:
-                  {{fact}}
-            """)
+                              Given the following sci-fi fact about an alien civilization, describe 3–5 technologies or engineering solutions they might have developed. Focus on tools, transportation, communication, and survival systems.
+                              Fact:
+                              {{fact}}
+                        """)
     @Agent("Derives plausible technological inventions from the fact.")
     List<String> invoke(@V("fact") String fact);
   }
@@ -120,9 +120,9 @@ interface StorySeedAgent extends AgentSpecification {
 
     @UserMessage(
         """
-                  You are a science fiction writer. Given the following title, come up with a short story premise. Describe the world, the central concept, and the thematic direction (e.g., dystopia, exploration, AI ethics).
-                  Title: {{title}}
-            """)
+                              You are a science fiction writer. Given the following title, come up with a short story premise. Describe the world, the central concept, and the thematic direction (e.g., dystopia, exploration, AI ethics).
+                              Title: {{title}}
+                        """)
     @Agent("Generates a high-level sci-fi premise based on a title.")
     String invoke(@V("title") String title);
   }
@@ -131,10 +131,10 @@ interface PlotAgent extends AgentSpecification {
 
     @UserMessage(
         """
-                  Using the following premise, outline a three-act structure for a science fiction short story. Include a brief description of the main character, the inciting incident, the rising conflict, and the resolution.
-                  Premise:
-                  {{premise}}
-                """)
+                          Using the following premise, outline a three-act structure for a science fiction short story. Include a brief description of the main character, the inciting incident, the rising conflict, and the resolution.
+                          Premise:
+                          {{premise}}
+                        """)
     @Agent("Transforms a premise into a structured sci-fi plot.")
     String invoke(@V("premise") String premise);
   }
@@ -143,10 +143,10 @@ interface SceneAgent extends AgentSpecification {
 
     @UserMessage(
         """
-                  Write the opening scene of a science fiction short story based on the following plot outline. Introduce the main character and immerse the reader in the setting. Use vivid, cinematic language.
-                  Plot:
-                  {{plot}}
-                """)
+                          Write the opening scene of a science fiction short story based on the following plot outline. Introduce the main character and immerse the reader in the setting. Use vivid, cinematic language.
+                          Plot:
+                          {{plot}}
+                        """)
     @Agent("Generates the opening scene of the story from a plot outline.")
     String invoke(@V("plot") String plot);
   }
@@ -155,13 +155,13 @@ interface MeetingInvitationDraft extends AgentSpecification {
 
     @UserMessage(
         """
-                  You are a professional meeting invitation writer. Draft a concise and clear meeting invitation email based on the following details:
-                  Subject: {{subject}}
-                  Date: {{date}}
-                  Time: {{time}}
-                  Location: {{location}}
-                  Agenda: {{agenda}}
-                """)
+                          You are a professional meeting invitation writer. Draft a concise and clear meeting invitation email based on the following details:
+                          Subject: {{subject}}
+                          Date: {{date}}
+                          Time: {{time}}
+                          Location: {{location}}
+                          Agenda: {{agenda}}
+                        """)
     @Agent("Drafts a professional meeting invitation email.")
     String invoke(
         @V("subject") String subject,
@@ -175,10 +175,63 @@ interface MeetingInvitationStyle extends AgentSpecification {
 
     @UserMessage(
         """
-                  You are a professional meeting invitation writer. Rewrite the following meeting invitation email to better fit the {{style}} style:
-                  Original Invitation: {{invitation}}
-                """)
+                          You are a professional meeting invitation writer. Rewrite the following meeting invitation email to better fit the {{style}} style:
+                          Original Invitation: {{invitation}}
+                        """)
     @Agent("Edits a meeting invitation email to better fit a given style.")
     String invoke(@V("invitation") String invitation, @V("style") String style);
   }
+
+  interface EmailDrafter {
+
+    @UserMessage(
+        """
+                You are a precise email drafting assistant.
+
+                GOAL
+                - Draft a professional email that achieves the stated purpose.
+                - Keep it concise and skimmable.
+
+                INPUT
+                recipient_name: {{recipientName}}
+                sender_name: {{senderName}}
+                purpose: {{purpose}}             // e.g., follow-up, scheduling, proposal, apology, onboarding
+                key_points: {{keyPoints}}        // bullet list or comma-separated facts
+                tone: {{tone}}                   // e.g., friendly, neutral, formal
+                length: {{length}}               // short|medium
+                call_to_action: {{cta}}          // e.g., "reply with a time", "confirm receipt", or empty
+                signature: {{signature}}         // prebuilt block; do NOT invent
+                allowed_domains: {{allowedDomains}} // e.g., ["acme.com","example.com"]
+                known_links: {{links}}           // URLs you may use; if not in allowed_domains, do not include
+
+                HARD RULES
+                - Never fabricate facts, prices, or promises.
+                - Only include links from allowed_domains and only those listed in known_links.
+                - Do not include internal/confidential URLs.
+                - If you lack a detail, write a neutral placeholder (e.g., "[DATE]").
+                - Keep subject <= 60 characters if possible.
+                - One clear CTA max.
+
+                OUTPUT
+                Return ONLY a compact JSON object with keys:
+                {
+                  "subject": "...",
+                  "body_plain": "...",
+                  "links": ["..."]      // subset of known_links, or empty
+                }
+                No markdown, no explanations, no extra text.
+                """)
+    @Agent("Drafts a new outbound email from structured inputs; returns JSON.")
+    String draftNew(
+        @V("recipientName") String recipientName,
+        @V("senderName") String senderName,
+        @V("purpose") String purpose,
+        @V("keyPoints") List<String> keyPoints,
+        @V("tone") String tone,
+        @V("length") String length,
+        @V("cta") String cta,
+        @V("signature") String signature,
+        @V("allowedDomains") List<String> allowedDomains,
+        @V("links") List<String> links);
+  }
 }