feat(opencode): allow changing model mid-session
维护者通常 1 天内回复
还没有人认领这个 Issue。
评估
调研方向
Start in opencode_compat.rs, especially resolve_session_agent(), set_session_overrides(), and the runtime update path shown in the issue. Trace how SessionMessageRequest.model is resolved and how the backing agent process is managed; done means a mid-session model change updates the runtime, handles unsupported native switching, and exposes the change to the frontend.
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描述
Problem
When an OpenCode session is created and the first message is sent, the agent/provider/model is locked into the session runtime context. Subsequent messages cannot change the provider or model because the runtime is only set on the first message:
state.opencode.update_runtime(session_id, |runtime| {
if runtime.session_agent_id.is_none() {
runtime.session_agent_id = Some(agent);
runtime.session_provider_id = Some(provider_id);
runtime.session_model_id = Some(model_id);
}
});
While SessionMessageRequest accepts a model field on every message, the resolved model from the first message is reused for all subsequent messages. The set_session_overrides() function can update the SessionState, but the OpenCode runtime context does not reflect the change.
This means users cannot switch models mid-conversation (e.g., start with a fast model for simple tasks, then switch to a more capable model for complex reasoning).
Expected Behavior
Users should be able to change the model on any message within an existing session. When a model field is provided in SessionMessageRequest, it should override the session-level model for that message and update the session runtime accordingly.
Proposed Approach
- In
resolve_session_agent()(opencode_compat.rs), update the runtime even whensession_agent_idis already set, if the incoming message specifies a different model. - When the model changes mid-session, terminate the existing backing agent process and start a new one with the updated model, or pass the model switch through to agents that support it natively.
- Emit a synthetic event (e.g.,
session.model_changed) so the frontend can reflect the model switch. - Consider whether changing the agent (not just the model within the same agent) mid-session should also be supported, or scoped out for now.
Considerations
- Some agents may not support model switching natively — the daemon may need to restart the backing process.
- The
PATCH /opencode/session/{sessionID}endpoint could also be extended to accept model changes, giving the frontend an explicit way to switch before sending the next message. - Need to decide how model changes interact with conversation history — the new model should still receive the full conversation context.
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