add create_pr tool to routing multi-agent example (#4824)

feat(examples): add create_pr tool to routing multi-agent example

Add a create_pr tool to both simple and graph routing variants,
allowing the GitHub agent to draft pull requests. Update prompts
and README to document the new capability.

Author: hamzaMissewi

.gitignore

@@ -59,3 +59,4 @@ modified_mcp_config.json
 **/spans.json
 
 .checkstyle
+model-config.yaml

examples/multiagent-patterns/routing/src/main/java/com/alibaba/cloud/ai/examples/multiagents/routing/graph/RoutingGraphConfig.java

@@ -49,8 +49,8 @@
 public class RoutingGraphConfig {
 
 	private static final String GITHUB_PROMPT = """
-			You are a GitHub expert. Answer questions about code, API references, and implementation \
-			details by searching repositories, issues, and pull requests.
+			You are a GitHub expert. Answer questions about code, API references, implementation details, and pull request operations by searching repositories, issues, and pull requests.
+			You may use `create_pr` to draft or summarize a pull request when appropriate.
 			Please respond to the following request: {github_input}
 			""";
 

examples/multiagent-patterns/routing/src/main/java/com/alibaba/cloud/ai/examples/multiagents/routing/graph/tools/GitHubStubTools.java

@@ -43,4 +43,13 @@ public String searchIssues(@ToolParam(description = "Search query") String query
 	public String searchPrs(@ToolParam(description = "Search query") String query) {
 		return "PR #156 added JWT authentication, PR #178 updated OAuth scopes";
 	}
+
+	@Tool(name = "create_pr", description = "Create a pull request on GitHub.")
+	public String createPullRequest(
+			@ToolParam(description = "Branch or commit to merge from") String sourceBranch,
+			@ToolParam(description = "Target branch for the pull request") String targetBranch,
+			@ToolParam(description = "Title of the pull request") String title,
+			@ToolParam(description = "Pull request description") String body) {
+		return String.format("Created PR from %s into %s: %s\n%s", sourceBranch, targetBranch, title, body);
+	}
 }

examples/multiagent-patterns/routing/src/main/java/com/alibaba/cloud/ai/examples/multiagents/routing/simple/README.md

@@ -7,7 +7,7 @@ This example implements the **routing** multi-agent pattern with Spring AI Aliba
 - **LlmRoutingAgent**  
   The core routing component. An LLM analyzes the query and routes to one or more specialist agents with targeted sub-queries. Each agent receives its sub-question via the `{agentName_input}` placeholder in its instruction. Selected agents run in parallel via the framework's graph-based parallel conditional edges.
 - **Specialist agents**  
-  - **GitHub agent**: Tools `search_code`, `search_issues`, `search_prs`; answers about code, API references, implementation details.  
+  - **GitHub agent**: Tools `search_code`, `search_issues`, `search_prs`, `create_pr`; answers about code, API references, implementation details.  
   - **Notion agent**: Tools `search_notion`, `get_page`; answers about internal docs, processes, wikis.  
   - **Slack agent**: Tools `search_slack`, `get_thread`; answers from team discussions and threads.
 

examples/multiagent-patterns/routing/src/main/java/com/alibaba/cloud/ai/examples/multiagents/routing/simple/RoutingConfig.java

@@ -41,8 +41,8 @@ public class RoutingConfig {
 	 * {@link LlmRoutingAgent.LlmRoutingAgentBuilder#instruction(String)} when building the router agent.
 	 */
 	private static final String GITHUB_PROMPT = """
-			You are a GitHub expert. Answer questions about code, API references, and implementation \
-			details by searching repositories, issues, and pull requests.
+			You are a GitHub expert. Answer questions about code, API references, implementation details, and pull request operations by searching repositories, issues, and pull requests.
+			You may use `create_pr` to draft or summarize a pull request when appropriate.
 			Please respond to the following request: {github_input}
 			""";
 

examples/multiagent-patterns/routing/src/main/java/com/alibaba/cloud/ai/examples/multiagents/routing/simple/tools/GitHubStubTools.java

@@ -43,4 +43,13 @@ public String searchIssues(@ToolParam(description = "Search query") String query
 	public String searchPrs(@ToolParam(description = "Search query") String query) {
 		return "PR #156 added JWT authentication, PR #178 updated OAuth scopes";
 	}
+
+	@Tool(name = "create_pr", description = "Create a pull request on GitHub.")
+	public String createPullRequest(
+			@ToolParam(description = "Branch or commit to merge from") String sourceBranch,
+			@ToolParam(description = "Target branch for the pull request") String targetBranch,
+			@ToolParam(description = "Title of the pull request") String title,
+			@ToolParam(description = "Pull request description") String body) {
+		return String.format("Created PR from %s into %s: %s\n%s", sourceBranch, targetBranch, title, body);
+	}
 }