Terminal locks up (non-recoverable) when listing Bedrock Agents during 'add agent' import on Windows 11

まず、Windows 11 の PowerShell と CMD の両方でインタラクティブな add agent フローを再現し、Bedrock Agents の一覧表示ステップと Ctrl+C の処理に重点を置きます。CLI のプロンプトとシグナル処理のエントリポイントを追跡して、端末が応答しなくなる理由を特定します。Agents が一覧表示され、端末が応答可能なままで、Ctrl+C でフローがキャンセルされれば完了です。

Description

On Windows 11 (both Windows PowerShell and CMD), AgentCore CLI 0.25.0 hangs at multiple points in the interactive add agent flow. The most severe is a full, non-recoverable terminal lockup when the CLI attempts to list Bedrock Agents to import. Ctrl+C / Ctrl+X do not kill the CLI — the terminal has to be closed.

Steps to Reproduce

From inside an existing AgentCore project with valid credentials:

1. Run agentcore
2. Select add
3. Select agent
4. Enter agent name: MyAgent
5. Select agent type: Import from Bedrock Agents
6. Select AWS region: US East (N. Virginia) (us-east-1)
7. The next screen (listing the Bedrock Agents) locks up the terminal.

Expected Behavior

The screen should list the available Bedrock Agents for import, and the CLI should remain responsive. Ctrl+C should cancel/exit the CLI at any prompt.

Actual Behavior

The Bedrock Agents listing screen hangs and locks up the terminal. The lockup appears non-recoverable — Ctrl+C and Ctrl+X do not kill the CLI, requiring the terminal to be force-closed.

CLI Version

0.25.0

Operating System

Windows

Additional Context

• Reproduced on Windows 11 in both Windows PowerShell and CMD.
• Reporter notes "a few hang points" in the flow; the Bedrock Agents listing lockup above is the most severe (non-recoverable).
• Ctrl+C not cancelling prompts suggests the interactive prompt/signal handling may not be wired up for the Windows console.