diff --git a/adapters/jco.py b/adapters/jco.py
new file mode 100755
index 00000000..8db1d349
--- /dev/null
+++ b/adapters/jco.py
@@ -0,0 +1,39 @@
+import subprocess
+import os
+import shlex
+from pathlib import Path
+from typing import Dict, List, Tuple
+
+# shlex.split() splits according to shell quoting rules
+JCO = shlex.split(os.getenv("JCO", "jco"))
+
+
+def get_name() -> str:
+    return "jco"
+
+
+def get_version() -> str:
+    result = subprocess.run(JCO + ["--version"],
+                            encoding="UTF-8", capture_output=True,
+                            check=True)
+    return result.stdout.strip()
+
+
+def get_wasi_versions() -> List[str]:
+    return ["wasm32-wasip2", "wasm32-wasip3"]
+
+
+def compute_argv(test_path: str,
+                 args: List[str],
+                 env: Dict[str, str],
+                 dirs: List[Tuple[Path, str]],
+                 wasi_version: str) -> List[str]:
+    argv = [] + JCO
+    argv += ["run"]
+    for k, v in env.items():
+        argv += ["--env", f"{k}={v}"]
+    for host, guest in dirs:
+        argv += ["--dir", f"{host}::{guest}"]  # noqa: E231
+    argv += [test_path]
+    argv += args
+    return argv