diff --git a/src/main/java/org/broadinstitute/barclay/argparser/CommandLineProgram.java b/src/main/java/org/broadinstitute/barclay/argparser/CommandLineProgram.java
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+++ b/src/main/java/org/broadinstitute/barclay/argparser/CommandLineProgram.java
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+package org.broadinstitute.barclay.argparser;
+
+/**
+ * Interface class to facilitate implementing command-line programs.
+ *
+ * <p>It should be considered as a marker interface to identify runnable Command Line Program
+ * classes in different toolkits, to aggregate them when looking for them. In addition, it includes
+ * the method {@link #instanceMain(String[])} to be call to parse the arguments and run the
+ * actual work.
+ *
+ * <p>Tool classes may want to extend this interface and {@link CommandLinePluginProvider} to
+ * include plugins in their command line.
+ *
+ * <p>Usage example:
+ *
+ * <ul>
+ *     <li>
+ *         Extend the class. Users may want to extend also {@link CommandLinePluginProvider} to
+ *         include plugins in the command line.
+ *     </li>
+ *     <li>
+ *         Mark the class with {@link CommandLineProgramProperties} to include information for the
+ *         tool. Users may consider to annotate with {@link BetaFeature} tools that are in experimental
+ *         phase.
+ *     </li>
+ *     <li>
+ *         Include data members marked with {@link Argument}, {@link ArgumentCollection},
+ *         {@link PositionalArguments} or {@link TaggedArgument} to include in the command line.
+ *         This members could be also annotated with {@link Hidden} or {@link Advanced} to tweak
+ *         how they are display.
+ *     </li>
+ *     <li>
+ *         Implement {@link #instanceMain(String[])} to use {@link CommandLineArgumentParser} to
+ *         parse the arguments and use the data members to perform the work.
+ *     </li>
+ *     <<li>
+ *         In a Main class, look for all the classes implementing {@link CommandLineProgram} (e.g.,
+ *         using {@link ClassFinder}). Matching the class name with a provided String, the user can
+ *         select the tool to be run, and the Main class can call {@link #instanceMain(String[])}
+ *         with the provided arguments.
+ *     </li>
+ * </ul>
+ *
+ * <p>Note: Barclay does not use or enforce this class for any purpose.
+ *
+ * @author Daniel Gomez-Sanchez (magicDGS)
+ */
+public interface CommandLineProgram {
+
+    /**
+     * Implements the work to be done with the tool.
+     *
+     * <p>This method should implement:
+     *
+     * <ul>
+     *     <li>Command line parsing using {@link CommandLineParser}</li>
+     *     <li>Run the actual work of the tool using data members populated by the parser.</li>
+     *     <li>Return the result of the tool.</li>
+     * </ul>
+     *
+     * <p>Note: Most exceptions should be caught by the caller.
+     *
+     * @param argv arguments to pass to the {@link CommandLineParser}.
+     *
+     * @return result object after performing the work. May be {@code null}.
+     */
+    public Object instanceMain(final String[] argv);
+}