Dev MCP: Allow enable/disable of methods

core/runtime/src/main/java/io/quarkus/runtime/annotations/DevMCPEnableByDefault.java

@@ -0,0 +1,18 @@
+package io.quarkus.runtime.annotations;
+
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+/**
+ * Enable a JsonRPC Method for MCP by default
+ */
+@Retention(RUNTIME)
+@Target({ METHOD })
+@Documented
+public @interface DevMCPEnableByDefault {
+
+}

docs/src/main/asciidoc/dev-mcp.adoc

@@ -52,7 +52,17 @@ footerPageBuildItem.addBuildTimeData(
 );
 ----
 
-The extra `description` argument is new: without it the data only appears in the Dev UI. Once supplied, the `jokes` data becomes an MCP resource.
+The extra `description` argument is new: without it the data only appears in the Dev UI. Once supplied, the `jokes` data becomes an MCP resource, however, by default this resource will be disabled. You can change the default by passing in `true` as another parameter after description, that will change this default to be enabled. Users can change this in Dev UI anyway, so this is just a sensible default.
+
+[source,java]
+----
+footerPageBuildItem.addBuildTimeData(
+    "jokes",
+    jokesBuildItem.getJokes(),
+    "Some funny jokes that the user might enjoy",
+    true
+);
+----
 
 ==== MCP Resources against a recorded value
 
@@ -76,6 +86,8 @@ BuildTimeActionBuildItem createBuildTimeActions() {
 <3> Set a human‑readable description.
 <4> Provide the runtime value returned by your recorder.
 
+By default this resource will be disabled, and the user has to enable it in Dev UI. You can change this default by adding `.enableMcpFuctionByDefault()` in the builder method.
+
 === MCP tools
 
 A tool corresponds to a method that a client can call. Any JSON‑RPC method can be exposed as a tool by supplying descriptions on the method and its parameters.
@@ -100,6 +112,8 @@ public class MyExtensionRPCService {
 <1> Description of the method.
 <2> Description of each parameter.
 
+By default this tool will be disabled, and the user has to enable it in Dev UI. You can change this default by adding the `@DevMCPEnableByDefault` annotation on the method.
+
 You must register the JSON‑RPC service in the deployment module:
 
 [source,java]
@@ -145,6 +159,8 @@ BuildTimeActionBuildItem createBuildTimeActions() {
 
 The code in the `function` runs on the deployment classpath. The function can return a plain value, a `CompletionStage` or `CompletableFuture` for asynchronous work.
 
+By default this tool will be disabled, and the user has to enable it in Dev UI. You can change this default by adding `.enableMcpFuctionByDefault()` in the builder method.
+
 === JSON‑RPC usage
 
 By default all JSON‑RPC methods are visible in the Dev UI. Only methods with descriptions are exposed via Dev MCP. 

extensions/agroal/runtime-dev/src/main/java/io/quarkus/agroal/runtime/dev/ui/DatabaseInspector.java

@@ -40,6 +40,7 @@
 import io.quarkus.assistant.runtime.dev.Assistant;
 import io.quarkus.datasource.common.runtime.DataSourceUtil;
 import io.quarkus.runtime.LaunchMode;
+import io.quarkus.runtime.annotations.DevMCPEnableByDefault;
 import io.quarkus.runtime.annotations.JsonRpcDescription;
 
 public final class DatabaseInspector {
@@ -96,6 +97,7 @@ protected void init() {
     }
 
     @JsonRpcDescription("Get all available datasources for the Database")
+    @DevMCPEnableByDefault
     public List<Datasource> getDataSources() {
         if (isDev) {
             List<Datasource> datasources = new ArrayList<>();
@@ -110,6 +112,7 @@ public List<Datasource> getDataSources() {
     }
 
     @JsonRpcDescription("Get a spesific datasource for the Database by name")
+    @DevMCPEnableByDefault
     private Datasource getDatasource(@JsonRpcDescription("Datasource name") String datasource) {
         if (isDev) {
             AgroalDataSource ads = checkedDataSources.get(datasource);
@@ -126,6 +129,7 @@ private Datasource getDatasource(@JsonRpcDescription("Datasource name") String d
     }
 
     @JsonRpcDescription("Get all the tables for a certain datasource")
+    @DevMCPEnableByDefault
     public List<Table> getTables(@JsonRpcDescription("Datasource name") String datasource) {
         if (isDev) {
             List<Table> tableList = new ArrayList<>();
@@ -238,6 +242,7 @@ public String generateDot(@JsonRpcDescription("Datasource name") String datasour
     }
 
     @JsonRpcDescription("Execute SQL against a certain datasource")
+    @DevMCPEnableByDefault
     public DataSet executeSQL(@JsonRpcDescription("Datasource name") String datasource,
             @JsonRpcDescription("Valid SQL to execute") String sql,
             @JsonRpcDescription("Page number for pagable rusults, starting at 1") Integer pageNumber,

extensions/devui/deployment-spi/src/main/java/io/quarkus/devui/spi/DevUIContent.java

@@ -11,13 +11,15 @@ public class DevUIContent {
     private final byte[] template;
     private final Map<String, Object> data;
     private final Map<String, String> descriptions;
+    private final Map<String, String> mcpDefaultEnabled;
     private final Map<String, String> contentTypes;
 
     private DevUIContent(DevUIContent.Builder builder) {
         this.fileName = builder.fileName;
         this.template = builder.template;
         this.data = builder.data;
         this.descriptions = builder.descriptions;
+        this.mcpDefaultEnabled = builder.mcpDefaultEnabled;
         this.contentTypes = builder.contentTypes;
     }
 
@@ -37,6 +39,10 @@ public Map<String, String> getDescriptions() {
         return descriptions;
     }
 
+    public Map<String, String> getMcpDefaultEnables() {
+        return mcpDefaultEnabled;
+    }
+
     public Map<String, String> getContentTypes() {
         return contentTypes;
     }
@@ -51,6 +57,7 @@ public static class Builder {
         private Map<String, Object> data;
         private Map<String, String> descriptions;
         private Map<String, String> contentTypes;
+        private Map<String, String> mcpDefaultEnabled;
 
         private Builder() {
             this.data = new HashMap<>();
@@ -88,6 +95,11 @@ public Builder descriptions(Map<String, String> descriptions) {
             return this;
         }
 
+        public Builder mcpDefaultEnables(Map<String, String> mcpDefaultEnabled) {
+            this.mcpDefaultEnabled = mcpDefaultEnabled;
+            return this;
+        }
+
         public Builder contentTypes(Map<String, String> contentTypes) {
             this.contentTypes = contentTypes;
             return this;

extensions/devui/deployment-spi/src/main/java/io/quarkus/devui/spi/buildtime/BuildTimeActionBuildItem.java

@@ -61,31 +61,31 @@ public SubscriptionBuilder subscriptionBuilder() {
     @Deprecated
     public <T> void addAction(String methodName,
             Function<Map<String, String>, T> action) {
-        this.addAction(new DeploymentJsonRpcMethod(methodName, null, Usage.onlyDevUI(), action));
+        this.addAction(new DeploymentJsonRpcMethod(methodName, null, Usage.onlyDevUI(), true, action));
     }
 
     @Deprecated
     public <T> void addAssistantAction(String methodName,
             BiFunction<Object, Map<String, String>, T> action) {
-        this.addAction(new DeploymentJsonRpcMethod(methodName, null, Usage.onlyDevUI(), action));
+        this.addAction(new DeploymentJsonRpcMethod(methodName, null, Usage.onlyDevUI(), true, action));
     }
 
     @Deprecated
     public <T> void addAction(String methodName,
             RuntimeValue runtimeValue) {
-        this.addAction(new RecordedJsonRpcMethod(methodName, null, Usage.onlyDevUI(), runtimeValue));
+        this.addAction(new RecordedJsonRpcMethod(methodName, null, Usage.onlyDevUI(), true, runtimeValue));
     }
 
     @Deprecated
     public <T> void addSubscription(String methodName,
             Function<Map<String, String>, T> action) {
-        this.addSubscription(new DeploymentJsonRpcMethod(methodName, null, Usage.onlyDevUI(), action));
+        this.addSubscription(new DeploymentJsonRpcMethod(methodName, null, Usage.onlyDevUI(), true, action));
     }
 
     @Deprecated
     public <T> void addSubscription(String methodName,
             RuntimeValue runtimeValue) {
-        this.addSubscription(new RecordedJsonRpcMethod(methodName, null, Usage.onlyDevUI(), runtimeValue));
+        this.addSubscription(new RecordedJsonRpcMethod(methodName, null, Usage.onlyDevUI(), true, runtimeValue));
     }
 
     private BuildTimeActionBuildItem addAction(DeploymentJsonRpcMethod deploymentJsonRpcMethod) {
@@ -116,6 +116,7 @@ public final class ActionBuilder {
         private Function<Map<String, String>, ?> function;
         private BiFunction<Object, Map<String, String>, ?> assistantFunction;
         private RuntimeValue<?> runtimeValue;
+        private boolean mcpEnabledByDefault = false;
 
         public ActionBuilder methodName(String methodName) {
             this.methodName = methodName;
@@ -141,6 +142,11 @@ public ActionBuilder usage(EnumSet<Usage> usage) {
             return this;
         }
 
+        public ActionBuilder enableMcpFuctionByDefault() {
+            this.mcpEnabledByDefault = true;
+            return this;
+        }
+
         public <T> ActionBuilder function(Function<Map<String, String>, T> function) {
             if (this.runtimeValue != null || this.assistantFunction != null)
                 throw new IllegalStateException("Only one of runtimeValue, function or assistantFunction is allowed");
@@ -170,13 +176,17 @@ public BuildTimeActionBuildItem build() {
             if (function != null) {
                 return addAction(
                         new DeploymentJsonRpcMethod(methodName, description, parameters, autoUsage(usage, description),
+                                mcpEnabledByDefault,
                                 function));
             } else if (runtimeValue != null) {
                 return addAction(
-                        new RecordedJsonRpcMethod(methodName, description, autoUsage(usage, description), runtimeValue));
+                        new RecordedJsonRpcMethod(methodName, description, autoUsage(usage, description),
+                                mcpEnabledByDefault,
+                                runtimeValue));
             } else if (assistantFunction != null) {
                 return addAction(
                         new DeploymentJsonRpcMethod(methodName, description, parameters, autoUsage(usage, description),
+                                mcpEnabledByDefault,
                                 assistantFunction));
             } else {
                 throw new IllegalStateException("Either function, assistantFunction or runtimeValue must be provided");
@@ -189,6 +199,7 @@ public final class SubscriptionBuilder {
         private String description;
         private Map<String, AbstractJsonRpcMethod.Parameter> parameters = new LinkedHashMap<>();;
         private EnumSet<Usage> usage;
+        private boolean mcpEnabledByDefault = false;
         private Function<Map<String, String>, ?> function;
         private RuntimeValue<?> runtimeValue;
 
@@ -216,6 +227,11 @@ public SubscriptionBuilder usage(EnumSet<Usage> usage) {
             return this;
         }
 
+        public SubscriptionBuilder enableMcpFuctionByDefault() {
+            this.mcpEnabledByDefault = true;
+            return this;
+        }
+
         public <T> SubscriptionBuilder function(Function<Map<String, String>, T> function) {
             this.function = function;
             return this;
@@ -233,10 +249,12 @@ public void build() {
                 parameters = null;
             if (function != null) {
                 addSubscription(new DeploymentJsonRpcMethod(methodName, description, parameters, autoUsage(usage, description),
+                        mcpEnabledByDefault,
                         function));
             } else if (runtimeValue != null) {
                 addSubscription(
-                        new RecordedJsonRpcMethod(methodName, description, autoUsage(usage, description), runtimeValue));
+                        new RecordedJsonRpcMethod(methodName, description, autoUsage(usage, description), mcpEnabledByDefault,
+                                runtimeValue));
             } else {
                 throw new IllegalStateException("Either function or runtimeValue must be provided");
             }

extensions/devui/deployment-spi/src/main/java/io/quarkus/devui/spi/buildtime/BuildTimeData.java

@@ -7,6 +7,7 @@ public class BuildTimeData {
     private Object content;
     private String description;
     private String contentType = "application/json"; // default
+    private boolean mcpEnabledByDefault = false;
 
     public BuildTimeData() {
 
@@ -21,9 +22,16 @@ public BuildTimeData(Object content, String description) {
         this.description = description;
     }
 
-    public BuildTimeData(Object content, String description, String contentType) {
+    public BuildTimeData(Object content, String description, boolean mcpEnabledByDefault) {
         this.content = content;
         this.description = description;
+        this.mcpEnabledByDefault = mcpEnabledByDefault;
+    }
+
+    public BuildTimeData(Object content, String description, boolean mcpEnabledByDefault, String contentType) {
+        this.content = content;
+        this.description = description;
+        this.mcpEnabledByDefault = mcpEnabledByDefault;
         this.contentType = contentType;
     }
 
@@ -50,4 +58,12 @@ public String getContentType() {
     public void setContentType(String contentType) {
         this.contentType = contentType;
     }
+
+    public boolean isMcpEnabledByDefault() {
+        return mcpEnabledByDefault;
+    }
+
+    public void setMcpEnabledByDefault(boolean mcpEnabledByDefault) {
+        this.mcpEnabledByDefault = mcpEnabledByDefault;
+    }
 }

extensions/devui/deployment-spi/src/main/java/io/quarkus/devui/spi/buildtime/QuteTemplateBuildItem.java

@@ -33,27 +33,34 @@ public List<TemplateData> getTemplateDatas() {
     }
 
     public void add(String templatename, Map<String, Object> data) {
-        templateDatas.add(new TemplateData(templatename, templatename, data, Map.of(), Map.of())); // By default the template is used for only one file.
+        templateDatas.add(new TemplateData(templatename, templatename, data, Map.of(), Map.of(), Map.of())); // By default the template is used for only one file.
     }
 
     public void add(String templatename, String fileName, Map<String, Object> data, Map<String, String> descriptions,
+            Map<String, String> mcpDefaultEnabled,
             Map<String, String> contentTypes) {
-        templateDatas.add(new TemplateData(templatename, fileName, data, descriptions, contentTypes));
+        templateDatas.add(new TemplateData(templatename, fileName, data, descriptions, mcpDefaultEnabled, contentTypes));
     }
 
     public static class TemplateData {
         final String templateName;
         final String fileName;
         final Map<String, Object> data;
         final Map<String, String> descriptions;
+        final Map<String, String> mcpDefaultEnabled;
         final Map<String, String> contentTypes;
 
-        private TemplateData(String templateName, String fileName, Map<String, Object> data, Map<String, String> descriptions,
+        private TemplateData(String templateName,
+                String fileName,
+                Map<String, Object> data,
+                Map<String, String> descriptions,
+                Map<String, String> mcpDefaultEnabled,
                 Map<String, String> contentTypes) {
             this.templateName = templateName;
             this.fileName = fileName;
             this.data = data;
             this.descriptions = descriptions;
+            this.mcpDefaultEnabled = mcpDefaultEnabled;
             this.contentTypes = contentTypes;
         }
 
@@ -73,6 +80,10 @@ public Map<String, String> getDescriptions() {
             return descriptions;
         }
 
+        public Map<String, String> getMcpDefaultEnables() {
+            return mcpDefaultEnabled;
+        }
+
         public Map<String, String> getContentTypes() {
             return contentTypes;
         }

extensions/devui/deployment-spi/src/main/java/io/quarkus/devui/spi/buildtime/jsonrpc/AbstractJsonRpcMethod.java

@@ -15,23 +15,26 @@ public abstract class AbstractJsonRpcMethod {
     private String description;
     private Map<String, Parameter> parameters;
     private EnumSet<Usage> usage;
+    private boolean mcpEnabledByDefault = false;
 
     public AbstractJsonRpcMethod() {
     }
 
     public AbstractJsonRpcMethod(String methodName, String description,
-            EnumSet<Usage> usage) {
+            EnumSet<Usage> usage, boolean mcpEnabledByDefault) {
         this.methodName = methodName;
         this.description = description;
         this.usage = usage;
+        this.mcpEnabledByDefault = mcpEnabledByDefault;
     }
 
     public AbstractJsonRpcMethod(String methodName, String description, Map<String, Parameter> parameters,
-            EnumSet<Usage> usage) {
+            EnumSet<Usage> usage, boolean mcpEnabledByDefault) {
         this.methodName = methodName;
         this.description = description;
         this.parameters = parameters;
         this.usage = usage;
+        this.mcpEnabledByDefault = mcpEnabledByDefault;
     }
 
     public String getMethodName() {
@@ -82,6 +85,14 @@ public void setUsage(EnumSet<Usage> usage) {
         this.usage = usage;
     }
 
+    public boolean isMcpEnabledByDefault() {
+        return mcpEnabledByDefault;
+    }
+
+    public void setMcpEnabledByDefault(boolean mcpEnabledByDefault) {
+        this.mcpEnabledByDefault = mcpEnabledByDefault;
+    }
+
     public static class Parameter {
         private Class<?> type;
         private String description;