Add "Interrupt and Resume" command (e.g. /btw) for mid-task Q&A without losing execution context #37246

Feature hasn't been suggested before.

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Describe the enhancement you want to request

I'd like OpenCode to support an "Interrupt and Resume" workflow similar to a feature I used in Qwen CLI (there it was a /btw command, roughly "by the way").

How it worked in Qwen CLI:

• While the agent is mid-execution on a task, you can invoke /btw .
• This pauses the current task without cancelling it.
• The CLI answers your question (or takes your comment into account) as a side conversation.
• Once resolved, execution resumes from where it left off — but if your input changes the approach, the agent adapts its remaining steps accordingly instead of blindly continuing the original plan.

Why this would be useful:

• Right now, interrupting a running task usually means cancelling it outright and losing progress/context.
• Sometimes I just want to ask a clarifying question, point out something the agent missed, or nudge its approach — without derailing the whole task.
• This is especially valuable for long-running or multi-step tasks where restarting is costly.

Proposed behavior:

1. A command (e.g. /btw, /interrupt, or similar) that pauses in-progress execution.
2. The agent responds to the side query/comment while retaining full context of the paused task.
3. Execution resumes automatically afterward.
4. If the side input implies a change in approach, the agent incorporates that into its remaining steps rather than sticking rigidly to the original plan.

Alternatives considered:

• Fully cancelling and restarting the task — loses progress and context.
• Waiting until the task finishes to ask — often too late to be useful if the concern affects the current steps.