Agent window model selection limited to Haiku 4.5 in VS Code Insiders

Description

When using Claude Agent in the agent window within VS Code Insiders, the model selector shows only "Claude Haiku 4.5" as available.

In contrast, the normal Claude Code window displays all available models:

• Claude Sonnet 4.6
• Claude Sonnet 4.6 1M
• Claude Default (Opus 4.7)
• Claude Haiku 4.5

Expected behavior

The agent window model selector should display the same set of available models as the normal window.

Actual behavior

Only Haiku 4.5 is available in the agent window model dropdown.

Environment

• VS Code Insiders
• Claude Code extension (agent window)