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+# Google Chrome Content Analysis Connector Agent SDK
+
+This directory holds the Google Chrome Content Analysis Connector Agent SDK.
+An Agent is an OS process running on the same computer as Google Chrome
+that listens for and processes content analysis requests from the browser.
+Supported OSes are Windows, Mac, and Linux.
+
+## Google Protocol Buffers
+
+This SDK depends on Google Protocol Buffers version 3.18 or later.  It may be
+installed from Google's [download page](https://developers.google.com/protocol-buffers/docs/downloads#release-packages)
+for your developement platform.  It may also be installed using a package
+manager.
+
+The included demo uses the Microsoft [vcpkg](https://github.com/microsoft/vcpkg)
+package manager to install protobuf.  vcpkg is available on all supported
+platforms.  See the demo for more details.
+
+## Adding the SDK into an agent
+
+Add the SDK to a content analysis agent as follows:
+
+1. Clone the SDK from [Github](https://github.com/chromium/content_analysis_sdk).
+This document assumes that the SDK is downloaded and extracted into the
+directory $SDK_DIR.
+
+2. Add the directory $SDK_DIR/include to the include path of the agent
+code base.
+
+3. Add all the source files in the directory $SDK_DIR/src to the agent build.
+Note that files ending in _win.cc or _win.h are meant only for Windows, files
+ending in _posix.cc or _posix.h are meant only for Linux, and files ending in
+_mac.cc or _mac.h are meant only for Mac.
+
+4. Reference the SDK in agent code using:
+```
+#include "content_analysis/sdk/local_analysis.h"
+```
+\ No newline at end of file