fix tool parsing to load json if json

nix/mlx.nix

@@ -41,7 +41,7 @@ let
 
   mlx = stdenv.mkDerivation rec {
     pname = "mlx";
-    version = let v = "0.30.7.dev20260220+13998a05"; in
+    version = let v = "0.30.7.dev20260224+e862b122"; in
       assert v == uvLockMlxVersion || throw "MLX version mismatch: nix/mlx.nix has ${v} but uv.lock has ${uvLockMlxVersion}. Update both the version and hash in nix/mlx.nix.";
       v;
     pyproject = true;
@@ -49,8 +49,8 @@ let
     src = fetchFromGitHub {
       owner = "rltakashige";
       repo = "mlx-jaccl-fix-small-recv";
-      rev = "13998a054715edcdc93618fb1496c79c7c25ff7c";
+      rev = "e862b1223a2310d4cc8df1135aed42f5246bc50a";
-      hash = "sha256-fAqA3hFwNBx7FcoGnhQsIFpAIRbC2EerACm4Fvne0Cc=";
+      hash = "sha256-GosFIWxIB48Egb1MqJrR3xhsUsQeWdRk5rV93USY6wQ=";
     };
 
     patches = [

src/exo/worker/runner/llm_inference/tool_parsers.py

@@ -51,11 +51,33 @@ def _parse_json_calls(text: str) -> list[ToolCallItem] | None:
         return None
 
 
+def _try_parse_json(v: str) -> str | dict[str, Any] | list[Any]:
+    stripped = v.strip()
+    if (stripped.startswith("[") and stripped.endswith("]")) or (
+        stripped.startswith("{") and stripped.endswith("}")
+    ):
+        try:
+            parsed: dict[str, Any] | list[Any] = json.loads(stripped)  # pyright: ignore[reportAny]
+            return parsed
+        except (json.JSONDecodeError, ValueError):
+            pass
+    return v
+
+
 def _flatten(p: dict[str, Any]) -> dict[str, str]:
-    return {
+    result: dict[str, str] = {}
-        k: json.dumps(v) if isinstance(v, (dict, list)) else str(v)  # pyright: ignore[reportAny]
+    for k, v in p.items():  # pyright: ignore[reportAny]
-        for k, v in p.items()  # pyright: ignore[reportAny]
+        if isinstance(v, dict):
-    }
+            resolved: dict[str, Any] = {
+                str(ik): _try_parse_json(str(iv)) if isinstance(iv, str) else iv  # pyright: ignore[reportUnknownArgumentType]
+                for ik, iv in v.items()  # pyright: ignore[reportUnknownVariableType]
+            }
+            result[k] = json.dumps(resolved)
+        elif isinstance(v, list):
+            result[k] = json.dumps(v)
+        else:
+            result[k] = str(v)  # pyright: ignore[reportAny]
+    return result
 
 
 json_tool_parser = ToolParser(

uv.lock

@@ -378,7 +378,7 @@ dependencies = [
     { name = "loguru", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "mflux", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "mlx", version = "0.30.6", source = { registry = "https://pypi.org/simple" }, extra = ["cpu"], marker = "sys_platform == 'linux'" },
-    { name = "mlx", version = "0.30.7.dev20260220+13998a05", source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#13998a054715edcdc93618fb1496c79c7c25ff7c" }, marker = "sys_platform == 'darwin'" },
+    { name = "mlx", version = "0.30.7.dev20260224+e862b122", source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#e862b1223a2310d4cc8df1135aed42f5246bc50a" }, marker = "sys_platform == 'darwin'" },
     { name = "mlx-lm", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "msgspec", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "openai-harmony", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
@@ -1025,7 +1025,7 @@ dependencies = [
     { name = "huggingface-hub", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "matplotlib", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "mlx", version = "0.30.6", source = { registry = "https://pypi.org/simple" }, extra = ["cuda13"], marker = "sys_platform == 'linux'" },
-    { name = "mlx", version = "0.30.7.dev20260220+13998a05", source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#13998a054715edcdc93618fb1496c79c7c25ff7c" }, marker = "sys_platform == 'darwin'" },
+    { name = "mlx", version = "0.30.7.dev20260224+e862b122", source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#e862b1223a2310d4cc8df1135aed42f5246bc50a" }, marker = "sys_platform == 'darwin'" },
     { name = "numpy", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "opencv-python", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "piexif", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
@@ -1072,8 +1072,8 @@ cuda13 = [
 
 [[package]]
 name = "mlx"
-version = "0.30.7.dev20260220+13998a05"
+version = "0.30.7.dev20260224+e862b122"
-source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#13998a054715edcdc93618fb1496c79c7c25ff7c" }
+source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#e862b1223a2310d4cc8df1135aed42f5246bc50a" }
 resolution-markers = [
     "sys_platform == 'darwin'",
 ]
@@ -1108,7 +1108,7 @@ version = "0.30.7"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jinja2", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
-    { name = "mlx", version = "0.30.7.dev20260220+13998a05", source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#13998a054715edcdc93618fb1496c79c7c25ff7c" }, marker = "sys_platform == 'darwin'" },
+    { name = "mlx", version = "0.30.7.dev20260224+e862b122", source = { git = "https://github.com/rltakashige/mlx-jaccl-fix-small-recv.git?branch=address-rdma-gpu-locks#e862b1223a2310d4cc8df1135aed42f5246bc50a" }, marker = "sys_platform == 'darwin'" },
     { name = "numpy", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "protobuf", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },
     { name = "pyyaml", marker = "sys_platform == 'darwin' or sys_platform == 'linux'" },