Agent detail view shows parent model (Fable 5) for subagents launched with model: "sonnet" override

Environment

• Claude Code 2.1.220, macOS (darwin 25.6.0), terminal CLI
• Parent session model: claude-fable-5

Bug

When spawning a subagent via the Agent tool with an explicit model: "sonnet" override, the transcript/chat view correctly shows the subagent as Sonnet, but clicking into the agent's detail view shows Fable 5 (the parent session's model) instead.

Repro

1. Run a session on Fable 5 (claude-fable-5).
2. Have the model call the Agent tool with subagent_type: "general-purpose" and model: "sonnet".
3. While the subagent runs (or after), click into the agent detail view.
4. Detail view header reports "Fable 5"; the chat surface for the same agent shows Sonnet as intended.

Unclear whether this is display-only or whether the override is dropped in some code path — earlier the same session had launches without the model param that genuinely inherited Fable, so an accurate detail view matters for verifying which model actually ran (e.g., policies that restrict browser tools to smaller models).

🤖 Generated with Claude Code