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diff --git a/sandbox/cobra/README.md b/sandbox/cobra/README.md
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+
+# usage
+cobra [target...]
+
+# description
+cobra tries to satisfies all specified targets and all of it dependencies.
+
+# targets
+targets can be a lot of different things, e.g. directories
+
+## dirctory targets
+try to do the right thing when the cobra search path contains a directory
+that contains an index.{js,sh,py,etc.} file.
+
+## cobra search path
+like your sh's PATH
+
+## example: cobra as some kind of make
+
+    $ echo $COBRA_PATH
+    .
+    $ ls .
+    foo/ bar/ baz/
+    $ cat foo/cobra.json
+    { "deps": "bar", "baz" }
+    $ cat bar/cobra.json
+    No such file or directory
+    $ cat baz/cobra.json
+    No such file or directory
+    $ cobra foo
+    [cobra bar]
+    [cobra baz]
+    [cobra foo]
+    $ exit
diff --git a/sandbox/cobra/hello/index.sh b/sandbox/cobra/hello/index.sh
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+echo 'Hello, world!'
diff --git a/sandbox/cobra/index.sh b/sandbox/cobra/index.sh
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+#! /bin/sh
+set -euf
+trap "echo 'You are made of stupid!' >&2; exit 23" EXIT
+
+COBRA_PATH="${COBRA_PATH-$PWD}"
+
+## main
+for target; do
+  for path in $COBRA_PATH; do
+    if test -d "$path/$target"; then
+      if index="$path/$target/index.sh" && test -f "$index"; then
+        exec /bin/sh "$index"
+      fi
+    fi
+  done
+done