feat: Enhance tool call handling with support for multiple tools in conversation

src/main/java/de/extio/lmlib/agent/BaseAgent.java

@@ -307,10 +307,9 @@ public interface BaseAgent {
 	}
 
 	private void appendToolCallResults(final Conversation conversation, final Completion completion, final List<ToolCallingAgentResponseHandler.ToolCallResult> toolCallResults) {
-		conversation.addTurn(new Conversation.Turn(TurnType.ASSISTANT, completion.response() == null ? "" : completion.response(), completion.toolCalls(), null));
-		for (final var toolCallResult : toolCallResults) {
-			conversation.addTurn(new Conversation.Turn(TurnType.TOOL, toolCallResult.output(), null, toolCallResult.toolCallId()));
-		}
+		conversation.appendToolCallRound(completion, toolCallResults.stream()
+				.map(toolCallResult -> new Conversation.ToolResult(toolCallResult.output(), toolCallResult.toolCallId()))
+				.toList());
 	}
 	
 	private List<Split> applyTemplate(final AgentContext context) {

src/main/java/de/extio/lmlib/client/Conversation.java

@@ -55,6 +55,23 @@ public final class Conversation {
 		}
 	}
 
+	public void appendToolCallRound(final Completion completion, final List<ToolResult> toolResults) {
+		if (completion == null) {
+			throw new IllegalArgumentException("completion must not be null");
+		}
+		this.appendToolCallRound(completion.response(), completion.toolCalls(), toolResults);
+	}
+
+	public void appendToolCallRound(final String assistantText, final List<ToolCall> toolCalls, final List<ToolResult> toolResults) {
+		this.addTurn(new Turn(TurnType.ASSISTANT, assistantText == null ? "" : assistantText, toolCalls, null));
+		if (toolResults == null || toolResults.isEmpty()) {
+			return;
+		}
+		for (final var toolResult : toolResults) {
+			this.addTurn(new Turn(TurnType.TOOL, toolResult.text(), null, toolResult.toolCallId()));
+		}
+	}
+
 	public void rewindTurn() {
 		synchronized (this.conversation) {
 			if (this.conversation.size() > 1) {
@@ -93,5 +110,12 @@ public final class Conversation {
 			this(type, text, List.of(), null);
 		}
 	}
+
+	public record ToolResult(String text, String toolCallId) {
+
+		public ToolResult {
+			text = text == null ? "" : text;
+		}
+	}
 	
 }

src/main/java/de/extio/lmlib/client/ToolCallData.java

@@ -27,6 +27,10 @@ public record ToolCallData(List<ToolDefinition> tools, String toolChoice, String
 		return new ToolCallData(List.copyOf(tools), null, forcedToolName, null);
 	}
 
+	public ToolCallData withParallelToolCalls(final boolean parallelToolCalls) {
+		return new ToolCallData(this.tools, this.toolChoice, this.forcedToolName, parallelToolCalls);
+	}
+
 	public boolean hasTools() {
 		return !this.tools.isEmpty();
 	}