[FEATURE] Add --dry-run flag for testing without API calls

[jwesleye]

Feature Description

Mock mode that simulates agent behavior without making real API calls - zero cost testing.

Problem/Motivation

Testing agent configuration and workflows shouldn't require spending money on API calls.

Proposed Solution

chat_loop myagent --dry-run

# Returns mock responses:
# - No real API calls
# - $0 cost
# - Instant responses
# - Can test configuration, tools, flows

Benefits

• Free testing and development
• CI/CD integration without costs
• Demo mode for presentations
• Onboarding without API keys

Priority

• Critical
• High
• Medium
• Low

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity.
It will be closed in 14 days if no further activity occurs.

If this issue is still relevant, please:

• Comment to keep it open
• Remove the "status: stale" label
• Provide additional information or updates

Thank you for your contributions!

[jwesleye]

Closing as out of scope for this AWS Strands CLI tool.

This project is focused on providing a simple, straightforward interface for AWS Strands agents. Advanced developer tooling adds complexity that doesn't serve the core use case of interactive agent conversations.

For these needs, we recommend:

• Debug/logging: Use Python's standard logging or AWS Strands' built-in debugging
• Agent validation: Test agents directly before using with chat loop
• Configuration: Edit ~/.chatrc directly (simple YAML file)
• Dry-run/testing: Use agents in test mode independently

Keeping the scope focused on being a great chat interface for AWS Strands agents.

Thank you for the suggestion!