diff --git a/.dockerignore b/.dockerignore
deleted file mode 100644
index 6577132..0000000
--- a/.dockerignore
+++ /dev/null
@@ -1,4 +0,0 @@
-# The image installs truecopy from npm and only needs the pin helper — keep the
-# build context tiny and reproducible rather than copying the working tree in.
-*
-!docker/pin-everything.mjs
diff --git a/Dockerfile.dockerignore b/Dockerfile.dockerignore
new file mode 100644
index 0000000..5f4e780
--- /dev/null
+++ b/Dockerfile.dockerignore
@@ -0,0 +1,7 @@
+# Scoped ignore for the truecopy-mcp image ONLY (BuildKit <Dockerfile>.dockerignore).
+# The image installs truecopy from npm and only needs the pin helper — keep the
+# build context tiny and reproducible rather than copying the working tree in.
+# NOT a root .dockerignore: ClusterFuzzLite (.clusterfuzzlite/Dockerfile) builds
+# from the same repo-root context and needs the full tree (see #76).
+*
+!docker/pin-everything.mjs