[建议 / Feature] Add /model and /reasoning slash commands that open the model & reasoning-effort dropdowns #903

提交前确认 · Pre-submission checklist

• 我已搜索过现有 issue，确认这不是重复建议 / I searched existing issues and confirmed this isn't a duplicate.
• 我已阅读 CONTRIBUTING.md / I've read CONTRIBUTING.md.

问题类别 · Category

模型设置 / 切换 · Model config / switching

涉及的 Agent 框架 · Agent framework

ZCode Agent（自研）

使用场景 · Use case

When I'm deep in a keyboard flow (typing a prompt, queuing follow-ups), switching the model or reasoning effort today means reaching for the mouse to click the toolbar trigger, or remembering that Ctrl+M exists — which is undiscoverable. Worse: out of habit I sometimes type /model into the chat input, and today that text is submitted verbatim as a prompt to the model instead of doing anything useful, which is surprising for a command-shaped input.

Related but different from #646 (in-chat model switching UI) and #164 (exposing /hooks //mcp//plugins commands): what's missing is the simplest keyboard path — a slash command that opens the model / reasoning dropdowns that already exist in the composer.

建议方案 · Proposal

Make /model and /reasoning first-class local commands in the GUI composer:

1. Selecting /model or /reasoning from the / autocomplete panel opens the same dropdown as clicking the toolbar trigger (model menu / reasoning-effort select). No new selection UI — reuse the existing one, same as Ctrl+M does today.
2. Typing /model (or /reasoning) as the whole input and pressing Enter does the same, instead of sending the literal text to the model.
3. Both commands appear in the / panel with descriptions, so the autocomplete itself teaches users that model switching is one slash away.

A working implementation is already on a fork branch (passing typecheck / lint / unit tests): https://github.com/pinion05/ZCode/tree/slashtogui — summary of the approach:

• Parse layer: /model & /reasoning become a local openConfigPicker command kind; commands carrying attachments still send as normal prompts.
• Delivery: a single reusable V4ComposerUiRequest channel (requestId pattern, mirrors externalTextInsertRequest); the toolbar consumes it by calling the existing GUI handlers — the Ctrl+M openRequestKey path for the model menu, the controlled Select open for the thought menu. No second open path is introduced.
• Future slash→GUI actions (e.g. opening plugin menus) can extend the same action union instead of adding new request props; host-owned actions (like /side) keep using the AppSlashCommand.run() pattern.

预期价值 · Expected value

• Keyboard-only users never leave the input to switch model / reasoning effort.
• The / autocomplete makes model switching discoverable (Ctrl+M is not).
• Fixes the surprising "typed /model becomes prompt text" behavior.
• The reusable request channel lowers the cost of future slash-command-driven GUI affordances.

你认为的优先级 · Your perceived priority

中 · Medium

你使用的 ZCode 版本 / 环境 · ZCode version / environment

v3.14.3 / ZCode Desktop / macOS (arm64)

补充材料 · Additional context

• Implementation branch: https://github.com/pinion05/ZCode/tree/slashtogui (fork of zai-org/ZCode, branch slashtogui, commit feat(ui): add /model and /reasoning slash commands to open composer config dropdowns)
• Verified: parser unit tests (5 cases), pnpm typecheck, oxlint (0 errors), oxfmt, pnpm architecture:check --changed all pass. E2E not covered (no E2E infra in the public repo yet).
• Happy to open a PR to zai-org/ZCode if the direction looks good.

中文概要： 建议为 GUI 输入框增加 /model 与 /reasoning 本地斜杠命令：从 / 面板选中或直接输入回车，即可打开工具栏现有的模型选择 / 思考档位下拉（与 Ctrl+M、点击触发器同一入口，不新增第二条打开路径）。目前已在我的 fork 分支上完成实现并通过 typecheck / lint / 单测，方向确认后可提 PR。请求通道（V4ComposerUiRequest）设计为可复用，后续插件菜单等"斜杠命令打开 GUI"类功能可直接扩展，无需新增请求 prop。