agent-signals

048. The agent installs on Windows arm64

View as Markdown Open in Claude Open in ChatGPT
Date
2026-10-30
Agents
none named
Measured on
CI runner windows-11-arm (Windows NT 10.0.26200, arm64), compared with CI runner windows-2022 and windows-2025 (x64)

Measured

2026-10-30, the scenario scenarios/windows-installs.ps1 in the scenarios workflow (run 41137353062, and again in run 41138908257), with the same agents, versions and install commands as in fact 47. Node.js 22.23.4 for arm64.

Measured on: CI runner windows-11-arm (Windows NT 10.0.26200, arm64), compared with CI runner windows-2022 and windows-2025 (x64).

What was measured

  1. Amp does not run on Windows arm64. npm installed @ampcode/cli with no error, but bin\amp.exe was a file of 141 bytes, and amp --version printed "This version of C:\npm\prefix\node_modules@ampcode\cli\bin\amp.exe is not compatible with the version of Windows you're running." and exited with 1. On x64, bin\amp.exe was 134,019,408 bytes and gave the version. The npm registry lists these platform packages of @ampcode/cli: linux-x64, linux-arm64, darwin-x64, darwin-arm64 and win32-x64. There is no win32-arm64 package.
  2. Each other agent of fact 47 installed and gave its version on arm64. These agents use a native arm64 package:
    • Claude Code: @anthropic-ai\claude-code-win32-arm64\claude.exe.
    • Codex CLI: @openai\codex-win32-arm64\vendor\aarch64-pc-windows-msvc\bin\codex.exe.
    • opencode: opencode-windows-arm64\bin\opencode.exe. There is no baseline package on arm64.
    • Copilot CLI: @github\copilot-win32-arm64\copilot.exe.
    • Factory Droid: @factory\cli-win32-arm64\bin\droid.exe.
    • Cline CLI: @cline\cli-windows-arm64\bin\cline.exe.
    • Kilo Code CLI: @kilocode\cli-windows-arm64\bin\kilo.exe. There is no baseline package on arm64.
    • Cursor CLI: versions\<version>\file_service.win32-arm64-msvc.node and merkle-tree-napi.win32-arm64-msvc.node.
  3. Qwen Code on arm64 has vendor\ripgrep\x64-win32\rg.exe, an x64 binary, and no arm64 rg.exe. Its native modules for the terminal and the clipboard are arm64 (@lydell\node-pty-win32-arm64, @teddyzhu\clipboard-win32-arm64-msvc).
  4. The .exe files of opencode, Amp (x64), Factory Droid and Kilo Code CLI have the file version 1.4.4, and cline.exe has 1.4.2, on both CPU types. The npm registry has @oven/bun-* packages with the version 1.4.4 (an optional dependency of Qwen Code).

Mechanism

An npm package with a native binary can install on a platform that it has no binary for, and fail only when it starts. A tool that sees the command on PATH must not take that as a working install.

The file version 1.4.4 is probably the version of Bun, if these executables are made with Bun. This was not checked in the binaries.

Incident

None.

Screens

None. The output is in the logs of the runs.

Not measured