New session spawned from keyboard shortcut inherits current mode instead of respecting default_agent

[pt-james-woszczynski]

Description

When starting a new session from an existing session using a keyboard shortcut (e.g. while in build mode), the new session opens in build mode rather than respecting the default_agent config setting.

Expected behaviour

A new session should always open using the agent specified in default_agent. In my case, "default_agent": "plan" is set in ~/.config/opencode/opencode.json, so new sessions should open in plan mode regardless of the current session's mode.

Actual behaviour

The new session inherits the mode of the session it was spawned from. If the current session is in build mode, the new session also opens in build mode.

Config

{
  "default_agent": "plan"
}

Environment

• OpenCode version: 1.14.31
• OS: macOS (darwin)
• Terminal: TUI

Steps to reproduce

1. Set "default_agent": "plan" in config
2. Open OpenCode (starts correctly in plan mode)
3. Switch to build mode with Tab
4. Start a new session via keyboard shortcut
5. Observe the new session opens in build mode instead of plan mode

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]:Option to always start sessions in the configured default agent mode #27370: Same root issue — default_agent config not being respected when sessions are opened; that issue covers resumed sessions opening in the wrong mode, which overlaps closely with this report about new sessions spawned from a keyboard shortcut inheriting the current mode instead of using default_agent.

For keybind-related issues, please also check our pinned keybinds documentation: #4997