diff --git a/CIDER_AGENT.md b/CIDER_AGENT.md
new file mode 100644
index 0000000..9b323fc
--- /dev/null
+++ b/CIDER_AGENT.md
@@ -0,0 +1,32 @@
+# Cider Agent Guidelines for Fuchsia (Cog Workspace)
+
+This document contains essential instructions and troubleshooting steps for AI
+agents operating within the Fuchsia Cog workspace. For comprehensive details on
+Fuchsia development, please always refer to @GEMINI.md
+
+## 1. Running `fx` Commands
+* The safest and most reliable way to run `fx` is to invoke it directly using
+ its path: `.jiri_root/bin/fx` (or `//.jiri_root/bin/fx` from the repo root).
+* Using `scripts/fx` or just `fx` might fail depending on the PATH
+ configuration. You may temporarily add `.jiri_root/bin` to your `$PATH`
+ during your session if needed.
+
+## 2. Workspace Initialization (Cog)
+* If `.jiri_root` is not present or you are encountering fundamental workspace
+ configuration issues, the Cog workspace might not be properly initialized.
+* The workspace setup script is located at
+ `scripts/cog/setup_cog_workspace.py`.
+* **Important:** This setup script only needs to be run **once** per workspace.
+ You do not need to run it repeatedly.
+
+## 3. Configuring the Build
+* Before building or running tests, ensure your build configuration is set up
+ correctly.
+* See `GEMINI.md` for more details on `fx set`, `fx build`, and building
+ specific targets.
+
+## 4. Additional Reference
+* For broader guidelines regarding C++/Rust development, writing tests, finding
+ FIDL methods, formatting commit messages, and managing Git in a multi-repo
+ environment (`jiri`), please consult the `GEMINI.md` file located at the root
+ of the Fuchsia directory.
diff --git a/OWNERS b/OWNERS
index 89894fd..e05d4c6 100644
--- a/OWNERS
+++ b/OWNERS
@@ -59,3 +59,4 @@
per-file .ignore = *
per-file GEMINI.md = file:.gemini/OWNERS
+per-file CIDER_AGENT.md = file:.gemini/OWNERS