Add support to use Ai skills

[cmoulliard]

• Add support to use Ai skills
• WIP

[cmoulliard]

There is an issue to be fixed

2026-04-20 17:52:07,430 INFO  [io.quarkiverse.langchain4j.skills.runtime.SkillsRecorder] (Quarkus Main Thread) Loaded 3 skill(s) from directory: /Users/cmoullia/code/quarkus/rewrite-mtool/migration-tool/.claude/skills
2026-04-20 17:52:07,441 INFO  [io.quarkiverse.langchain4j.vertexai.runtime.anthropic.VertexAiBaseChatModel] (Quarkus Main Thread) Request: [SystemMessage { text = "You have access to the following skills:
<available_skills>
<skill>
<name>migrate-spring-to-quarkus</name>
<description>Migrate Spring Boot applications to Quarkus. Use when the user wants to migrate, convert, or port a Spring Boot app to Quarkus, or asks about Spring-to-Quarkus migration steps. Supports both Spring compatibility extensions and native Quarkus migration paths.</description>                                                                                                                                           
</skill>                                                                                                                                                                                                            
<skill>                                                                                                                                                                                                             
<name>write-rule</name>                                                                                                                                                                                             
<description>Create migration rules for mtool (migration-tool). Use when the user wants to write, create, or add a new YAML migration rule for Java application migrations (Spring Boot to Quarkus, RESTEasy Classic to Reactive, etc.).</description>                                                                                                                                                                                  
</skill>                                                                                                                                                                                                            
<skill>                                                                                                                                                                                                             
<name>spring-boot-to-quarkus-migration-orchestrator</name>                                                                                                                                                          
<description>Decision-gate orchestrator that evaluates preconditions to determine which migration phases to execute during a Spring Boot to Quarkus migration.</description>                                        
</skill>                                                                                                                                                                                                            
</available_skills>                                                                                                                                                                                                 
" }, UserMessage { name = null, contents = [TextContent { text = "Migrate the application using the SKILL provided" }], attributes = {} }]                                                                          
                                                                                                                                                                                                                    
2026-04-20 17:52:07,445 ERROR [dev.snowdrop.mtool.transform.provider.impl.AiSkillsProvider] (Quarkus Main Thread) Error executing AI SKILL: Param was null
java.lang.NullPointerException: Param was null
        at org.jboss.resteasy.reactive.client.impl.WebTargetImpl.resolveTemplate(WebTargetImpl.java:112)
        at org.jboss.resteasy.reactive.client.impl.WebTargetImpl.resolveTemplate(WebTargetImpl.java:25)
        at io.quarkiverse.langchain4j.vertexai.runtime.anthropic.VertexAiRestApi$$QuarkusRestClientInterface.createMessage(Unknown Source)
        at io.quarkiverse.langchain4j.vertexai.runtime.anthropic.VertexAiAnthropicChatModel.callApi(VertexAiAnthropicChatModel.java:73)
        at io.quarkiverse.langchain4j.vertexai.runtime.anthropic.VertexAiBaseChatModel.chat(VertexAiBaseChatModel.java:101)
        at dev.langchain4j.guardrail.SynchronousChatExecutor.execute(SynchronousChatExecutor.java:32)
        at dev.langchain4j.guardrail.AbstractChatExecutor.executeInternal(AbstractChatExecutor.java:66)
        at dev.langchain4j.guardrail.AbstractChatExecutor.execute(AbstractChatExecutor.java:52)
        at io.quarkiverse.langchain4j.runtime.aiservice.AiServiceMethodImplementationSupport.doImplement0(AiServiceMethodImplementationSupport.java:403)
        at io.quarkiverse.langchain4j.runtime.aiservice.AiServiceMethodImplementationSupport.doImplement(AiServiceMethodImplementationSupport.java:207)
        at io.quarkiverse.langchain4j.runtime.aiservice.AiServiceMethodImplementationSupport.implement(AiServiceMethodImplementationSupport.java:182)
        at dev.snowdrop.mtool.transform.provider.ai.SkillsAssistant$$QuarkusImpl.chat(Unknown Source)
        at dev.snowdrop.mtool.transform.provider.impl.AiSkillsProvider.lambda$execAiSkillCmd$0(AiSkillsProvider.java:118)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1604)
        at dev.snowdrop.mtool.transform.provider.impl.AiSkillsProvider.execAiSkillCmd(AiSkillsProvider.java:110)
        at dev.snowdrop.mtool.transform.provider.impl.AiSkillsProvider.executeAiInstruction(AiSkillsProvider.java:93)
        at dev.snowdrop.mtool.transform.provider.impl.AiSkillsProvider.execute(AiSkillsProvider.java:59)
        at dev.snowdrop.mtool.transform.TransformationService.lambda$callProvider$0(TransformationService.java:72)
        at java.base/java.util.Optional.map(Optional.java:260)

[cmoulliard]

VertexAiAnthropicChatModel

The publisher parameter was missing. Fixed with: c7a60fe