Unable to choose models when using opencode attach http://<tailscale-ip>:port

[kevinher7]

Description

Although I can perfectly use opencode in this attach session (with the default Big Pickle model), once I try to change models I get the following error (see the end of the issue)

• I can correctly models both at the "host" computer (via ssh and then manually running opencode) and also from the "attached" computer (via just running opencode normally)

• In my current setup, the "host" is running NixOS (configuration here if useful) while the "attached" computer is running MacOS Tahoe (26.3) with an M1 chip

TypeError: undefined is not an object (evaluating 'G().length')
    at when (/$bunfs/root/src/index.js:886:12786)
    at <anonymous> (/$bunfs/root/src/index.js:882:75617)
    at h_ (/$bunfs/root/src/index.js:882:64605)
    at T9 (/$bunfs/root/src/index.js:882:64369)
    at i_ (/$bunfs/root/src/index.js:882:63287)
    at h_ (/$bunfs/root/src/index.js:882:64605)
    at T9 (/$bunfs/root/src/index.js:882:64369)
    at i (/$bunfs/root/src/index.js:882:58249)
    at I0 (/$bunfs/root/src/index.js:882:75663)
    at q4 (/$bunfs/root/src/index.js:882:60979)
    at h_ (/$bunfs/root/src/index.js:882:64605)
    at T9 (/$bunfs/root/src/index.js:882:64369)
    at v_ (/$bunfs/root/src/index.js:882:62385)
    at <anonymous> (/$bunfs/root/src/index.js:886:12760)
    at q4 (/$bunfs/root/src/index.js:882:60979)
    at h_ (/$bunfs/root/src/index.js:882:64605)
    at T9 (/$bunfs/root/src/index.js:882:64369)
    at v_ (/$bunfs/root/src/index.js:882:62385)
    at q4 (/$bunfs/root/src/index.js:882:60979)
    at h_ (/$bunfs/root/src/index.js:882:64605)
    at T9 (/$bunfs/root/src/index.js:882:64369)
    at v_ (/$bunfs/root/src/index.js:882:62385)
    at <anonymous> (/$bunfs/root/src/index.js:882:119577)
    at h_ (/$bunfs/root/src/index.js:882:64605)
    at T9 (/$bunfs/root/src/index.js:882:64369)
    at a8 (/$bunfs/root/src/index.js:882:57794)
    at W (/$bunfs/root/src/index.js:882:119564)
    at h_ (/$bunfs/root/src/index.js:882:64605)
    at T9 (/$bunfs/root/src/index.js:882:64369)
    at a8 (/$bunfs/root/src/index.js:882:57794)
    at f (/$bunfs/root/src/index.js:882:119173)
    at <anonymous> (/$bunfs/root/src/index.js:883:132017)
    at q4 (/$bunfs/root/src/index.js:882:60979)
    at h_ (/$bunfs/root/src/index.js:882:64605)
    at T9 (/$bunfs/root/src/index.js:882:64369)
    at v_ (/$bunfs/root/src/index.js:882:62385)
    at <anonymous> (/$bunfs/root/src/index.js:882:75752)
    at h_ (/$bunfs/root/src/index.js:882:64605)
    at T9 (/$bunfs/root/src/index.js:882:64369)
    at nQ (/$bunfs/root/src/index.js:882:66222)
    at r_ (/$bunfs/root/src/index.js:882:67177)
    at VL0 (/$bunfs/root/src/index.js:882:66517)
    at J5 (/$bunfs/root/src/index.js:882:66413)
    at K (/$bunfs/root/src/index.js:883:12459)
    at replace (/$bunfs/root/src/index.js:883:133350)
    at onSelect (/$bunfs/root/src/index.js:994:17337)
    at trigger (/$bunfs/root/src/index.js:905:20001)
    at a (/$bunfs/root/src/index.js:928:5864)
    at onKeyDown (/$bunfs/root/src/index.js:928:7391)
    at <anonymous> (/$bunfs/root/src/index.js:936:4249)
    at <anonymous> (/$bunfs/root/chunk-2mmvm5jr.js:80:40856)
    at emitWithPriority (/$bunfs/root/chunk-2mmvm5jr.js:3:32993)
    at processParsedKey (/$bunfs/root/chunk-2mmvm5jr.js:3:32057)
    at handleStdinEvent (/$bunfs/root/chunk-2mmvm5jr.js:100:5104)
    at <anonymous> (/$bunfs/root/chunk-2mmvm5jr.js:100:4973)
    at drain (/$bunfs/root/chunk-2mmvm5jr.js:32:6460)
    at drainStdinParser (/$bunfs/root/chunk-2mmvm5jr.js:100:4945)
    at <anonymous> (/$bunfs/root/chunk-2mmvm5jr.js:100:2763)
    at emit (node:events:95:22)
    at addChunk (internal:streams/readable:264:47)
    at readableAddChunkPushByteMode (internal:streams/readable:242:18)
    at internalRead (native:38:40)
    at processTicksAndRejections (native:7:39)...

Plugins

None I believe

OpenCode version

1.14.35

Steps to reproduce

1. Configure opencode in home manager via the following

{ config, lib, ... }:
{
  programs.opencode = {
    enable = true;
    # tui.themes = "nord";
  };

  systemd.user.services.opencode-web = {
    Unit = {
      Description = "OpenCode Web Service";
      After = [ "network.target" ];
    };

    Service = {
      ExecStart = "${lib.getExe config.programs.opencode.package} serve --hostname 0.0.0.0 --port 4096";
      WorkingDirectory = "/home/uribo/nixos-config";
      Restart = "always";
      RestartSec = 5;
      # TODO: add EnvironmentFile with sops-nix password
    };

    Install = {
      WantedBy = [ "default.target" ];
    };
  };
}

2. Ensure both hosts have tailscale running and then attach using `opencode attach http://:4096

3. Attempt to change models via /models

4. Get the error with the screen in the screenshot section

Screenshot and/or share link

Operating System

macOS 26.3 and NixOS (25.11 stable)

Terminal

Ghostty

[kevinher7]

After reviewing further, this might be due to some PATH issues when running the opencode attach command