Files
fusion/packages
gsxdsm 8835c6cb48 FN-7908: add in-chat model/agent switcher to brain-icon popup
Extend the chat brain-icon popup and its backing session PATCH route so an
active Direct chat's model or agent can be switched mid-conversation instead
of only being set at creation time.

- Add a Model/Agent section to ChatThinkingLevelControl (the brain-icon
  popup) for picking a model provider/model or retargeting to a real agent
  without leaving the chat.
- Extend PATCH /api/chat/sessions/:id to accept modelProvider/modelId (as a
  validated pair via the existing validateModelPair helper) and agentId,
  forwarding only the keys present in the body so omitted fields leave the
  session's stored target untouched.
- Add chat-store updateSession support for the agentId clause alongside the
  existing model/thinkingLevel fields, and a useChat.setSessionModel hook
  for the dashboard to call the new PATCH capability.
- Update i18n locale strings (en/es/fr/ko/zh-CN/zh-TW) and dashboard-guide.md
  docs for the new switcher UI.
- Add unit/integration test coverage across chat-store, chat-manager,
  chat-routes, useChat, ChatThinkingLevelControl, and ChatView for the new
  model/agent switch behavior.
- Add changeset fn-7908-chat-model-agent-switcher.md (minor,
  @runfusion/fusion).

Files changed:
 .changeset/fn-7908-chat-model-agent-switcher.md    |   7 +
 docs/dashboard-guide.md                            |   3 +-
 packages/core/src/__tests__/chat-store.test.ts     |  21 ++
 packages/core/src/chat-store.ts                    |   8 +
 packages/core/src/chat-types.ts                    |   2 +
 packages/dashboard/app/api/legacy.ts               |  11 +-
 .../app/components/ChatThinkingLevelControl.tsx    | 219 ++++++++++++++++++---
 packages/dashboard/app/components/ChatView.css     | 135 ++++++++++++-
 packages/dashboard/app/components/ChatView.tsx     |  23 ++-
 .../__tests__/ChatThinkingLevelControl.test.tsx    | 109 +++++++++-
 .../__tests__/ChatView.thinking-level.test.tsx     |  67 ++++++-
 .../dashboard/app/hooks/__tests__/useChat.test.ts  | 166 +++++++++++++++-
 packages/dashboard/app/hooks/useChat.ts            |  56 ++++++
 .../dashboard/src/__tests__/chat-manager.test.ts   |  38 ++++
 .../dashboard/src/__tests__/chat-routes.test.ts    | 117 ++++++++++-
 .../dashboard/src/routes/register-chat-routes.ts   |  48 ++++-
 packages/i18n/locales/en/app.json                  |   8 +-
 packages/i18n/locales/es/app.json                  |   8 +-
 packages/i18n/locales/fr/app.json                  |   8 +-
 packages/i18n/locales/ko/app.json                  |   8 +-
 packages/i18n/locales/zh-CN/app.json               |   8 +-
 packages/i18n/locales/zh-TW/app.json               |   8 +-
 22 files changed, 1007 insertions(+), 71 deletions(-)

Fusion-Task-Id: FN-7908

Fusion-Task-Lineage: b1104865-9b0c-4d77-973e-89152fe245e0

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>
2026-07-12 21:33:50 -07:00
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