ACP servers fail to launch in WSL

[klonuo]

Reproduction steps

Start any ACP server installed through ACP registry

Current vs. Expected behavior

Any ACP server fails

Zed version and system specs

Zed 1.1.6
Commit: 9696291
Version: 1.1.6+stable.265.96962914296a22c22a7f226b5ae7de4dd0e34729

Attach Zed log file

Example log for pi acp agent:

Zed.log

2026-05-08T14:57:38+02:00 INFO  [node_runtime] (remote server) using Node.js found on PATH: SystemNodeRuntime { node: "/home/noble/.nvm/versions/node/v24.13.0/bin/node", npm: "/home/noble/.nvm/versions/node/v24.13.0/bin/npm", scratch_dir: "/home/noble/.local/share/zed/node" }
2026-05-08T14:57:38+02:00 INFO  [agent_client_protocol::util] connection; name="zed"
2026-05-08T14:57:42+02:00 WARN  [agent_servers::acp] agent stderr: stty: 'standard input': Inappropriate ioctl for device
2026-05-08T14:57:54+02:00 WARN  [agent_client_protocol::jsonrpc::incoming_actor] Transport parse error, sending error notification error=Error { code: -32700: Parse error, message: "Parse error", data: Some(Object {"line": String("\u{1b}[1 q{\"jsonrpc\":\"2.0\",\"id\":\"a23fb6c7-177a-447a-a487-a8b63484c7b6\",\"result\":{\"protocolVersion\":1,\"agentInfo\":{\"name\":\"pi-acp\",\"title\":\"pi ACP adapter\",\"version\":\"0.0.26\"},\"authMethods\":[{\"id\":\"pi_terminal_login\",\"name\":\"Launch pi in the terminal\",\"description\":\"Start pi in an interactive terminal to configure API keys or login\",\"type\":\"terminal\",\"args\":[\"--terminal-login\"],\"env\":{},\"_meta\":{\"terminal-auth\":{\"command\":\"pi-acp\",\"args\":[\"--terminal-login\"],\"label\":\"Launch pi\"}}}],\"agentCapabilities\":{\"loadSession\":true,\"mcpCapabilities\":{\"http\":false,\"sse\":false},\"promptCapabilities\":{\"image\":true,\"audio\":false,\"embeddedContext\":false},\"sessionCapabilities\":{\"list\":{}}}}}")}) }
2026-05-08T14:57:54+02:00 WARN  [agent_servers::acp] agent stderr: Invalid message {
2026-05-08T14:57:54+02:00 WARN  [agent_servers::acp] agent stderr:   message: {
2026-05-08T14:57:54+02:00 WARN  [agent_servers::acp] agent stderr:     jsonrpc: '2.0',
2026-05-08T14:57:54+02:00 WARN  [agent_servers::acp] agent stderr:     error: { code: -32700, message: 'Parse error', data: [Object] }
2026-05-08T14:57:54+02:00 WARN  [agent_servers::acp] agent stderr:   }
2026-05-08T14:57:54+02:00 WARN  [agent_servers::acp] agent stderr: }

Relevant Zed settings

settings.json

Relevant Keymap

keymap.json

(for AI issues) Model provider details

No response

If you are using WSL on Windows, what flavor of Linux are you using?

Ubuntu

[miguelraz]

I definitely have this working on my end - Could you share logs of what's going wrong here please?

[klonuo]

@miguelraz I already included the log in the opening issue

[miguelraz]

My bad!

I meant to say: can you share logs of non-PI ACP servers failing? Is it the same message?

[klonuo]

On other ACP servers there are no log messages - it just says "Loading..." in the pane and nothing happens.

I tried with Opencode and Github copilot, their respective processes are started (I can see them in process explorer) but nothing happens in Zed. For example Github copilot launches this process:

"C:\Program Files\PowerShell\7\pwsh.exe" -C "wsl.exe --distribution Ubuntu-24.04 --cd /home/noble/dev/moepp -- /bin/bash -i -c 'exec env <LARGE BLOCK WITH ENV VARS> /home/noble/.nvm/versions/node/v24.13.0/bin/npm --prefix /home/noble/.local/share/zed/external_agents/registry/npx/github-copilot-cli exec ''--cache=/home/noble/.local/share/zed/node/cache'' --yes -- ''@github/copilot@0.0.0 - 1.0.44'' --acp'"

This is the whole log:

2026-05-08T23:10:50+02:00 INFO  [zed] ========== starting zed version 1.1.6+stable.265.96962914296a22c22a7f226b5ae7de4dd0e34729, sha 9696291 ==========
2026-05-08T23:10:50+02:00 INFO  [gpui_windows::directx_devices] Using GPU: NVIDIA GeForce 940MX
2026-05-08T23:10:50+02:00 INFO  [gpui_windows::directx_devices] Created device with Direct3D 11.0 feature level.
2026-05-08T23:10:50+02:00 INFO  [gpui_windows::direct_write] Use Segoe UI as UI font.
2026-05-08T23:10:51+02:00 INFO  [crashes] crash signal handlers installed
2026-05-08T23:10:51+02:00 INFO  [crashes] spawning crash handler process
2026-05-08T23:10:51+02:00 INFO  [crashes] connected to crash handler process after 100ms
2026-05-08T23:10:51+02:00 INFO  [crashes] crash handler registered
2026-05-08T23:10:51+02:00 INFO  [extension_host] extensions updated. loading 27, reloading 0, unloading 0
2026-05-08T23:10:51+02:00 INFO  [workspace] Rendered first frame
2026-05-08T23:10:51+02:00 INFO  [zed::zed] Using GPU: GpuSpecs { is_software_emulated: false, device_name: "NVIDIA GeForce 940MX", driver_name: "NVIDIA Corporation", driver_info: "545.84 r545_74" }
2026-05-08T23:10:51+02:00 ERROR [crates/gpui_windows/src/events.rs:646] The operation completed successfully. (0x00000000)
2026-05-08T23:10:51+02:00 INFO  [remote::transport::wsl] Connecting to WSL distro Ubuntu-24.04 with user None
2026-05-08T23:10:52+02:00 INFO  [remote::transport::wsl] Remote shell discovered: /bin/bash
2026-05-08T23:10:54+02:00 INFO  [remote::transport::wsl] Remote has wsl interop enabled
2026-05-08T23:10:54+02:00 INFO  [remote::transport::wsl] Remote platform discovered: RemotePlatform { os: Linux, arch: X86_64 }
2026-05-08T23:10:58+02:00 INFO  [crashes] (remote server) spawning crash handler process
2026-05-08T23:10:58+02:00 INFO  [remote_server] (remote server) starting up with PID 410558:
pid_file: "/home/noble/.local/share/zed/server_state/workspace-40/server.pid", log_file: "/home/noble/.local/share/zed/logs/server-workspace-40.log", stdin_socket: "/home/noble/.local/share/zed/server_state/workspace-40/stdin.sock", stdout_socket: "/home/noble/.local/share/zed/server_state/workspace-40/stdout.sock", stderr_socket: "/home/noble/.local/share/zed/server_state/workspace-40/stderr.sock"
2026-05-08T23:10:58+02:00 INFO  [crashes] (remote server) connected to crash handler process after 100ms
2026-05-08T23:10:58+02:00 INFO  [crashes] (remote server) crash handler registered
2026-05-08T23:10:58+02:00 INFO  [remote_server] (remote server) gpui app started, initializing server
2026-05-08T23:10:58+02:00 INFO  [remote_server] (remote server) accepting new connections
2026-05-08T23:10:58+02:00 INFO  [remote_server] (remote server) accepted new connections
2026-05-08T23:10:58+02:00 INFO  [zed::zed] Using GPU: GpuSpecs { is_software_emulated: false, device_name: "NVIDIA GeForce 940MX", driver_name: "NVIDIA Corporation", driver_info: "545.84 r545_74" }
2026-05-08T23:10:59+02:00 INFO  [util] (remote server) set environment variables from shell:/bin/bash, path:/home/noble/.local/bin:/mnt/c/WINDOWS/system32:/home/noble/go/bin:/home/noble/.nvm/versions/node/v24.13.0/bin:/home/noble/.opencode/bin:/home/noble/.cargo/bin:/home/noble/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/usr/lib/wsl/lib:/snap/bin
2026-05-08T23:10:59+02:00 INFO  [remote_server] (remote server) Got new node settings: NodeBinarySettings { path: None, npm_path: None, ignore_system_version: false }
2026-05-08T23:10:59+02:00 INFO  [alacritty_terminal::tty::windows::conpty] Using conpty.dll for pseudoconsole
2026-05-08T23:11:03+02:00 INFO  [git::repository] (remote server) opening git repository at "/home/noble/dev/moepp/.git" using git binary "/usr/bin/git"
2026-05-08T23:11:03+02:00 INFO  [language] (remote server) found user-installed language server for yaml-language-server. path: "/home/noble/.nvm/versions/node/v24.13.0/bin/yaml-language-server", arguments: ["--stdio"]
2026-05-08T23:11:03+02:00 INFO  [lsp] (remote server) starting language server process. binary path: "/home/noble/.nvm/versions/node/v24.13.0/bin/yaml-language-server", working directory: "/home/noble/dev/moepp", args: ["--stdio"]
2026-05-08T23:11:03+02:00 INFO  [node_runtime] (remote server) using Node.js found on PATH: SystemNodeRuntime { node: "/home/noble/.nvm/versions/node/v24.13.0/bin/node", npm: "/home/noble/.nvm/versions/node/v24.13.0/bin/npm", scratch_dir: "/home/noble/.local/share/zed/node" }
2026-05-08T23:11:03+02:00 INFO  [util::shell] Found powershell in: C:\Program Files\PowerShell\7\pwsh.exe
2026-05-08T23:11:03+02:00 INFO  [agent_client_protocol::util] connection; name="zed"
2026-05-08T23:11:05+02:00 INFO  [node_runtime] using Node.js found on PATH: SystemNodeRuntime { node: "C:\\Program Files\\nodejs\\node.exe", npm: "C:\\Program Files\\nodejs\\npm.cmd", scratch_dir: "C:\\Users\\klo\\AppData\\Local\\Zed\\node" }

[miguelraz]

Thanks for the info, will pass it on to the team.