[P0.5] Dev: Streaming large responses causes constant screen refresh/flicker

[tejaskash]

Description

In local dev mode, streaming large responses causes the terminal screen to be in a constant state of being refreshed/redrawn, making it unusable.

Reporter

kandoin

Category

UI/UX Bug

Steps to Reproduce

1. Run agentcore dev
2. Invoke the agent with a prompt that generates a large streaming response
3. Observe screen behavior

Expected Behavior

Streaming output should append smoothly without causing the entire screen to refresh.

Actual Behavior

Screen is in a constant state of being refreshed, making the CLI unusable. Reporter stated this made them "ABANDON the cli."

Impact

High - significantly impacts usability of the dev command.

[tejaskash]

Duplicate of #234