fix(python): resolve Linux runtime without helper

python/sdk-runtime/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write python/sdk-runtime/README.md
-README.md: 29ffc1dcc3ec3b273ccaee64734739f3c4f34b9c
-README.zh.md: d79c87090867c60e09c50016bad4797170b34400
+README.md: efdb5cf9f87e0831ef09a47e6ffdb99254a17f36
+README.zh.md: cafac7418608c416a9f291d62442c32b8787b1fc

python/sdk-runtime/README.md

@@ -15,12 +15,12 @@ Both carriers hold the same content, defined once: the [package.json](package.js
 
 A missing exe raises `FileNotFoundError` naming both acquisition routes: build via `scripts/build-exe-for-python-sdk.ts` in a deepseek-harness checkout, or install the matching platform runtime wheel produced by the `build-exe-for-python-sdk` CI workflow. A missing dev-only node carrier names its sole route, the build script. The workflow retains wheels rather than standalone executable archives. Acquisition strategy is deliberately separate from the lookup interface, so an on-demand download can replace it later without touching callers.
 
-Each wheel contains exactly one runtime executable and its matching native spawn helper. A missing sidecar makes the runtime installation incomplete and is a hard startup error, even for a selected Cordis composition that does not use PTY tools; old exe-only wheels are intentionally unsupported. The fixed tags are `py3-none-manylinux_2_28_x86_64`, `py3-none-manylinux_2_28_aarch64`, and `py3-none-macosx_11_0_arm64`; the build hook rejects `py3-none-any`, absent or multiple runtime files, non-executable files, and unsupported platform tags. The repository root `package.json` supplies the shared version for this package and the SDK, and a `python-vX.Y.Z` release tag must match it.
+Each wheel contains exactly one runtime executable. The macOS wheel also contains its matching native spawn helper; a missing sidecar makes that installation incomplete and is a hard startup error, even for a selected Cordis composition that does not use PTY tools. Linux wheels contain no spawn helper because `node-pty` uses the staged `pty.node` addon directly. The fixed tags are `py3-none-manylinux_2_28_x86_64`, `py3-none-manylinux_2_28_aarch64`, and `py3-none-macosx_11_0_arm64`; the build hook rejects `py3-none-any`, absent or multiple runtime files, non-executable files, and unsupported platform tags. The repository root `package.json` supplies the shared version for this package and the SDK, and a `python-vX.Y.Z` release tag must match it.
 
 ## Resolution API
 
 - `resolve_bundled_launch_args(mode=None) -> tuple[str, ...]` — the argv tuple that launches the bundled runtime: `(exe_path,)` in exe mode, `(node_path, bin_js_path)` in node mode. Mode selection: explicit argument > `DSH_RUNTIME_MODE` env var (`exe` | `node`) > automatic. Automatic resolution finds the production exe ONLY — the dev-only node carrier must be opted into explicitly so a production deployment can never silently ride on a source build.
-- `bundled_runtime_path() -> Path` — the platform exe path (exe carrier only; it validates that the required sibling `-spawn-helper` is also installed). The node carrier has no single-path equivalent and launches via the argv tuple above.
+- `bundled_runtime_path() -> Path` — the platform exe path (exe carrier only; on macOS it validates that the required sibling `-spawn-helper` is also installed). The node carrier has no single-path equivalent and launches via the argv tuple above.
 - `bundled_default_config_path() -> Path` — the checked-in default config (see below).
 - `bundled_package_dir() -> Path` — the installed package data root.
 

python/sdk-runtime/README.zh.md

@@ -15,12 +15,12 @@ Python SDK 的运行时载体包（分发名 `deepseek-harness-runtime-bin`，
 
 exe 缺失时抛出 `FileNotFoundError`，并写明两种获取途径：在 deepseek-harness 检出中经 `scripts/build-exe-for-python-sdk.ts` 构建，或安装 `build-exe-for-python-sdk` CI 工作流生成的对应平台运行时 wheel 包。仅限开发的 `node` 载体缺失时只提示构建脚本这一条途径。该工作流只保留 wheel 包，不保留独立 exe 归档。获取策略与查找接口刻意分离，之后可以换成按需下载而不改动任何调用方。
 
-每个 wheel 包只包含一个运行时可执行文件及其匹配的原生 spawn helper。缺少伴随文件意味着运行时安装不完整，并会在启动时硬失败，即使所选 Cordis 组合不使用 PTY 工具也是如此；旧的仅 exe wheel 有意不再兼容。固定标签为 `py3-none-manylinux_2_28_x86_64`、`py3-none-manylinux_2_28_aarch64` 与 `py3-none-macosx_11_0_arm64`；构建钩子会拒绝 `py3-none-any`、运行时文件缺失或重复、文件不可执行以及不支持的平台标签。仓库根目录的 `package.json` 为本包和 SDK 提供共同版本，`python-vX.Y.Z` 发布标签必须与其匹配。
+每个 wheel 包只包含一个运行时可执行文件。macOS wheel 包还包含与其匹配的原生 spawn helper；缺少伴随文件意味着该安装不完整，并会在启动时硬失败，即使所选 Cordis 组合不使用 PTY 工具也是如此。Linux wheel 包不包含 spawn helper，因为 `node-pty` 直接使用暂存的 `pty.node` 原生插件。固定标签为 `py3-none-manylinux_2_28_x86_64`、`py3-none-manylinux_2_28_aarch64` 与 `py3-none-macosx_11_0_arm64`；构建钩子会拒绝 `py3-none-any`、运行时文件缺失或重复、文件不可执行以及不支持的平台标签。仓库根目录的 `package.json` 为本包和 SDK 提供共同版本，`python-vX.Y.Z` 发布标签必须与其匹配。
 
 ## 解析 API
 
 - `resolve_bundled_launch_args(mode=None) -> tuple[str, ...]`——启动内置运行时的 argv 元组：exe 模式下为 `(exe_path,)`，`node` 模式下为 `(node_path, bin_js_path)`。模式选择：显式参数 > `DSH_RUNTIME_MODE` 环境变量（`exe` | `node`）> 自动。自动解析只找生产 exe——仅限开发的 `node` 载体必须显式选用，从而生产部署绝不会悄悄跑在源码构建上。
-- `bundled_runtime_path() -> Path`——平台 exe 路径（仅 exe 载体，并会校验必要的 `-spawn-helper` 伴随文件也已安装）。`node` 载体没有单一路径的等价物，经由上面的 argv 元组启动。
+- `bundled_runtime_path() -> Path`——平台 exe 路径（仅 exe 载体，并会在 macOS 上校验必要的 `-spawn-helper` 伴随文件也已安装）。`node` 载体没有单一路径的等价物，经由上面的 argv 元组启动。
 - `bundled_default_config_path() -> Path`——检入的默认配置（见下文）。
 - `bundled_package_dir() -> Path`——已安装包的数据根目录。
 

python/sdk-runtime/src/deepseek_harness_runtime/__init__.py

@@ -5,8 +5,8 @@ Two runtime carriers coexist under ``runtime/``, both injected by the repo's
 
 - **exe (production)**: single-file Node executables named
   ``dsh-jsonrpc-agent-pkg-<platform>-<arch>`` (platform in {linux, macos}, arch in
-  {x64, arm64}) plus a sibling ``-spawn-helper`` used by ``node-pty``; the
-  target machine needs no Node installation.
+  {x64, arm64}); macOS also uses a sibling ``-spawn-helper``. The target machine
+  needs no Node installation.
 - **node (dev-only)**: the full deploy closure under ``runtime/node/``
   (``package.json`` + ``node_modules/``), executed as ``node
   runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`` on a
@@ -71,11 +71,11 @@ def bundled_default_config_path() -> Path:
 def bundled_runtime_path() -> Path:
     """Absolute path of the bundled single-file runtime executable for the current platform.
 
-    Raises FileNotFoundError when the platform is unsupported or the executable
-    has not been placed into this package; the message names the acquisition
-    routes (acquisition strategy is deliberately separate from this lookup
-    interface, so an on-demand download can replace it without touching
-    callers).
+    Raises FileNotFoundError when the platform is unsupported, the executable
+    has not been placed into this package, or the required macOS spawn helper is
+    missing; the message names the acquisition routes (acquisition strategy is
+    deliberately separate from this lookup interface, so an on-demand download
+    can replace it without touching callers).
     """
     tag = _current_platform_tag()
     path = bundled_package_dir() / "runtime" / f"dsh-jsonrpc-agent-pkg-{tag}"
@@ -84,12 +84,13 @@ def bundled_runtime_path() -> Path:
             f"deepseek-harness-runtime-bin is missing the runtime executable at {path}. "
             + _EXE_ACQUISITION_HINT
         )
-    helper = Path(f"{path}{SPAWN_HELPER_SUFFIX}")
-    if not helper.is_file():
-        raise FileNotFoundError(
-            f"deepseek-harness-runtime-bin is missing the node-pty spawn helper at {helper}. "
-            + _EXE_ACQUISITION_HINT
-        )
+    if tag.startswith("macos-"):
+        helper = Path(f"{path}{SPAWN_HELPER_SUFFIX}")
+        if not helper.is_file():
+            raise FileNotFoundError(
+                f"deepseek-harness-runtime-bin is missing the node-pty spawn helper at {helper}. "
+                + _EXE_ACQUISITION_HINT
+            )
     return path
 
 

python/sdk/tests/test_runtime_resolution.py

@@ -2,6 +2,9 @@
 
 from __future__ import annotations
 
+from pathlib import Path
+
+import deepseek_harness_runtime as runtime
 import pytest
 
 from deepseek_harness_runtime import (
@@ -39,3 +42,27 @@ def test_explicit_mode_wins_over_env_mode(monkeypatch: pytest.MonkeyPatch) -> No
     except FileNotFoundError:
         return  # explicit 'exe' was honored; only the artifact is missing
     assert args[0].endswith(("-x64", "-arm64"))
+
+
+@pytest.mark.parametrize(
+    ("platform_tag", "requires_helper"),
+    [("linux-x64", False), ("macos-arm64", True)],
+)
+def test_runtime_requires_spawn_helper_only_on_macos(
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+    platform_tag: str,
+    requires_helper: bool,
+) -> None:
+    runtime_dir = tmp_path / "runtime"
+    runtime_dir.mkdir()
+    executable = runtime_dir / f"dsh-jsonrpc-agent-pkg-{platform_tag}"
+    executable.touch()
+    monkeypatch.setattr(runtime, "bundled_package_dir", lambda: tmp_path)
+    monkeypatch.setattr(runtime, "_current_platform_tag", lambda: platform_tag)
+
+    if requires_helper:
+        with pytest.raises(FileNotFoundError, match="node-pty spawn helper"):
+            runtime.bundled_runtime_path()
+    else:
+        assert runtime.bundled_runtime_path() == executable