macOS: every prompt fails with "undefined is not an object (evaluating 'a.name')"

Description

macOS: every prompt fails with undefined is not an object

OpenCode starts successfully and creates a session, but every prompt/tool
invocation fails with:

TypeError: undefined is not an object (evaluating 'a.name')

The error occurs in SystemPrompt.environment.

Environment

• OpenCode: 1.18.30
• Installation: Homebrew (/opt/homebrew/bin/opencode)
• macOS Darwin: 24.6.0
• Architecture: arm64
• Shell: /bin/zsh
• Terminal: xterm-256color
• Model: opencode-go/glm-5.3-flash
• Plugins: none
• LSPs and formatters: disabled

Actual behavior

The prompt fails with:

TypeError: undefined is not an object (evaluating 'a.name')
    at resolve (/$bunfs/root/chunk-36bwgd4p.js:2:1659)
    ...
    at SystemPrompt.environment
    at SessionPrompt.run

The error reproduces with a clean configuration:

XDG_CONFIG_HOME="$(mktemp -d)" \
XDG_DATA_HOME="$(mktemp -d)" \
opencode

Additional information

OpenCode also reports:

Failed to fetch models.dev
cause=Cause([Fail(TimeoutError)])

However, OpenCode itself starts successfully. The main issue is the
reproducible a.name TypeError when sending a prompt.

Before the update everything worked just fine.

Plugins

none

OpenCode version

1.18.30

Steps to reproduce

1. Start OpenCode in any directory.
2. Create a new session.
3. Send any prompt.

Screenshot and/or share link

Operating System

macOS 15.7.9

Terminal

Ghostty