diff --git a/.radicle/ambient.yaml b/.radicle/ambient.yaml
index d43b4b6c..155d60b7 100644
--- a/.radicle/ambient.yaml
+++ b/.radicle/ambient.yaml
@@ -30,7 +30,10 @@ plan:
       export CARGO_TARGET_DIR=/workspace/cache
       export CARGO_HOME=/workspace/deps
       export HOME=/root
-      export PATH="/root/.cargo/bin:$PATH"
+      export PATH="/root/.cargo/bin:/root/.radicle/bin:$PATH"
+
+      # Check that `rad` is there.
+      rad --help >/dev/null || (echo rad is not there; exit 1)
 
       cargo doc --workspace --no-deps