500, adding entry point to inspect command

mvnw/pom.xml

@@ -35,10 +35,16 @@
       <version>5.13.1</version>
       <scope>compile</scope>
     </dependency>
+    <dependency>
+      <groupId>org.hamcrest</groupId>
+      <artifactId>hamcrest</artifactId>
+      <version>3.0</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
   <build>
     <finalName>eoc</finalName>
-    <sourceDirectory>${eo.generatedDir}</sourceDirectory>
+    <sourceDirectory>src/main/java</sourceDirectory>
     <directory>${eo.targetDir}</directory>
     <outputDirectory>${eo.targetDir}/classes</outputDirectory>
     <testOutputDirectory>${eo.targetDir}/test-classes</testOutputDirectory>
@@ -97,6 +103,13 @@
         <artifactId>maven-jar-plugin</artifactId>
         <version>3.4.2</version>
         <configuration>
+          <excludes>
+            <exclude>org/eolang/Inspect.class</exclude>
+            <exclude>org/eolang/Inspect$*.class</exclude>
+            <exclude>**/InspectTest.class</exclude>
+            <exclude>**/InspectTest$*.class</exclude>
+            <exclude>org/eolang/package-info.class</exclude>
+          </excludes>
           <archive>
             <manifest>
               <addClasspath>true</addClasspath>
@@ -133,6 +146,18 @@
         <artifactId>build-helper-maven-plugin</artifactId>
         <version>3.6.1</version>
         <executions>
+          <execution>
+            <id>add-source</id>
+            <phase>generate-sources</phase>
+            <goals>
+              <goal>add-source</goal>
+            </goals>
+            <configuration>
+              <sources>
+                <source>${eo.generatedDir}</source>
+              </sources>
+            </configuration>
+          </execution>
           <execution>
             <id>add-test-sources</id>
             <phase>generate-test-sources</phase>
@@ -149,4 +174,51 @@
       </plugin>
     </plugins>
   </build>
+  <profiles>
+    <profile>
+      <id>inspect</id>
+      <activation>
+        <activeByDefault>true</activeByDefault>
+      </activation>
+      <dependencies>
+        <dependency>
+          <groupId>org.takes</groupId>
+          <artifactId>takes</artifactId>
+          <version>1.24.6</version>
+        </dependency>
+      </dependencies>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-assembly-plugin</artifactId>
+            <version>3.6.0</version>
+            <executions>
+              <execution>
+                <id>make-inspect-jar</id>
+                <phase>package</phase>
+                <goals>
+                  <goal>single</goal>
+                </goals>
+                <configuration>
+                  <descriptors>
+                    <descriptor>src/assembly/inspect.xml</descriptor>
+                  </descriptors>
+                  <archive>
+                    <manifest>
+                      <mainClass>org.eolang.Inspect</mainClass>
+                    </manifest>
+                  </archive>
+                  <finalName>inspect</finalName>
+                  <attach>false</attach>
+                  <appendAssemblyId>false</appendAssemblyId>
+                  <outputDirectory>${project.build.directory}</outputDirectory>
+                </configuration>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
 </project>

mvnw/src/assembly/inspect.xml

@@ -0,0 +1,39 @@
+<!--
+ * SPDX-FileCopyrightText: Copyright (c) 2022-2025 Objectionary.com
+ * SPDX-License-Identifier: MIT
+-->
+<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2
+                              http://maven.apache.org/xsd/assembly-1.1.2.xsd">
+    <id>inspect</id>
+    <formats>
+        <format>jar</format>
+    </formats>
+    <includeBaseDirectory>false</includeBaseDirectory>
+    <fileSets>
+        <fileSet>
+            <directory>${project.build.outputDirectory}</directory>
+            <includes>
+                <include>org/eolang/Inspect.class</include>
+                <include>org/eolang/Inspect$*.class</include>
+                <include>org/eolang/package-info.class</include>
+            </includes>
+            <outputDirectory>/</outputDirectory>
+        </fileSet>
+    </fileSets>
+    <dependencySets>
+        <dependencySet>
+            <scope>compile</scope>
+            <useProjectArtifact>false</useProjectArtifact>
+            <unpack>true</unpack>
+            <useTransitiveDependencies>true</useTransitiveDependencies>
+            <useTransitiveFiltering>false</useTransitiveFiltering>
+            <includes>
+                <include>org.takes:takes</include>
+                <include>org.cactoos:cactoos</include>
+            </includes>
+            <outputDirectory>/</outputDirectory>
+        </dependencySet>
+    </dependencySets>
+</assembly>

mvnw/src/main/java/org/eolang/Inspect.java

@@ -0,0 +1,49 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2022-2025 Objectionary.com
+ * SPDX-License-Identifier: MIT
+ */
+package org.eolang;
+
+import java.io.IOException;
+import org.takes.Request;
+import org.takes.Response;
+import org.takes.Take;
+import org.takes.facets.fork.FkRegex;
+import org.takes.facets.fork.TkFork;
+import org.takes.http.FtBasic;
+import org.takes.rq.RqPrint;
+import org.takes.rs.RsText;
+
+/**
+ * HTTP inspection server.
+ * @since 0.29.0
+ */
+public final class Inspect {
+    /**
+     * Prevents instantiation (required by qulice UseUtilityClass rule).
+     */
+    private Inspect() {
+        // Intentionally empty
+    }
+
+    /**
+     * Main entry point.
+     * @param args Command line arguments
+     * @throws IOException If server fails to start
+     */
+    public static void main(final String... args) throws IOException {
+        new FtBasic(
+            new TkFork(
+                new FkRegex(
+                    "/echo",
+                    (Take) req -> new RsText(new RqPrint(req).printBody())
+                ),
+                new FkRegex(
+                    "/",
+                    new RsText("Server is running. Use /echo endpoint")
+                )
+            ),
+            8080
+        ).start(() -> Thread.currentThread().isInterrupted());
+    }
+}

mvnw/src/main/java/org/eolang/package-info.java

@@ -0,0 +1,11 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2022-2025 Objectionary.com
+ * SPDX-License-Identifier: MIT
+ */
+
+/**
+ * EO inspection utilities.
+ * Includes HTTP server for testing (under developing).
+ * @since 0.29.0
+ */
+package org.eolang;

mvnw/src/test/java/org/eolang/InspectTest.java

@@ -0,0 +1,62 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2022-2025 Objectionary.com
+ * SPDX-License-Identifier: MIT
+ */
+package org.eolang;
+
+import java.io.IOException;
+import org.junit.jupiter.api.Test;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+/**
+ * Smoke test to ensure that {@link Inspect} server starts without throwing exceptions.
+ * <p>
+ * This test launches the server in a separate thread to verify startup stability.
+ * Functional behavior is tested in {@code test_inspect.js}.
+ * </p>
+ *
+ * @since 0.29.0
+ */
+final class InspectTest {
+    /**
+     * Verifies that {@link Inspect#main(String[])} starts without errors.
+     *
+     * @throws Exception If the thread is interrupted
+     */
+    @Test
+    void runsWithoutExceptions() throws Exception {
+        final Thread server = new Thread(
+            new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        Inspect.main();
+                    } catch (final IOException ex) {
+                        throw new IllegalStateException("IOException while starting server", ex);
+                    }
+                }
+            }
+        );
+        server.start();
+        final long start = System.currentTimeMillis() + 10_000L;
+        while (System.currentTimeMillis() < start && !server.isAlive()) {
+            Thread.sleep(100);
+        }
+        assertThat(
+            "Server thread should be running after start",
+            server.isAlive(),
+            is(true)
+        );
+        server.interrupt();
+        final long stop = System.currentTimeMillis() + 5_000L;
+        while (System.currentTimeMillis() < stop && server.isAlive()) {
+            Thread.sleep(100);
+        }
+        assertThat(
+            "Server thread should be terminated after interrupt",
+            server.isAlive(),
+            is(false)
+        );
+    }
+}

mvnw/src/test/java/org/eolang/package-info.java

@@ -0,0 +1,10 @@
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2022-2025 Objectionary.com
+ * SPDX-License-Identifier: MIT
+ */
+
+/**
+ * Unit tests for Inspect server.
+ * @since 0.29.0
+ */
+package org.eolang;