diff --git a/tools/handler.hpp b/tools/handler.hpp
new file mode 100644
index 0000000..2335977
--- /dev/null
+++ b/tools/handler.hpp
@@ -0,0 +1,79 @@
+#pragma once
+
+#include "interface.hpp"
+
+#include <ipmiblob/blob_interface.hpp>
+#include <string>
+
+namespace host_tool
+{
+
+class UpdateHandlerInterface
+{
+  public:
+    virtual ~UpdateHandlerInterface() = default;
+
+    /**
+     * Check if the goal firmware is listed in the blob_list and that the
+     * handler's supported data type is available.
+     *
+     * @param[in] goalFirmware - the firmware to check /flash/image
+     * /flash/tarball, etc.
+     */
+    virtual bool checkAvailable(const std::string& goalFirmware) = 0;
+
+    /**
+     * Send the file contents at path to the blob id, target.
+     *
+     * @param[in] target - the blob id
+     * @param[in] path - the source file path
+     */
+    virtual void sendFile(const std::string& target,
+                          const std::string& path) = 0;
+
+    /**
+     * Trigger verification.
+     *
+     * @param[in] target - the verification blob id (may support multiple in the
+     * future.
+     * @return true if verified, false if verification errors.
+     */
+    virtual bool verifyFile(const std::string& target) = 0;
+
+    /**
+     * Cleanup the artifacts by triggering this action.
+     */
+    virtual void cleanArtifacts() = 0;
+};
+
+/** Object that actually handles the update itself. */
+class UpdateHandler : public UpdateHandlerInterface
+{
+  public:
+    UpdateHandler(ipmiblob::BlobInterface* blob, DataInterface* handler) :
+        blob(blob), handler(handler)
+    {
+    }
+
+    ~UpdateHandler() = default;
+
+    bool checkAvailable(const std::string& goalFirmware) override;
+
+    /**
+     * @throw ToolException on failure.
+     */
+    void sendFile(const std::string& target, const std::string& path) override;
+
+    /**
+     * @throw ToolException on failure (TODO: throw on timeout.)
+     */
+    bool verifyFile(const std::string& target) override;
+
+    void cleanArtifacts() override;
+
+  private:
+    ipmiblob::BlobInterface* blob;
+    DataInterface* handler;
+};
+
+} // namespace host_tool