Bug Description: LongCast 2.5 Preview enters an infinite loop while reading files. #52884

Description

During a refactoring session on the LumeBook project, the model entered an infinite loop repeatedly making the same read calls on the same files (paragraph_blocks.dart and inline_text_frame.dart) without taking any action. The loop was only interrupted when the user reported the behavior.

Expected behavior: After reading the necessary files, the model should have proceeded with the implementation.

Observed behavior: The model got stuck repeating the same reads without advancing, consuming tokens without making progress.

Context: The project uses Flutter/Dart, and the editor_screen.dart file has 15,828 lines. The model was trying to understand the structure before proposing the UI refactoring to the Block Model (rendering a text widget per paragraph).

I've been experiencing this issue with LongCast 2.5 Preview since I first started using it 3 days ago. The model gets stuck in an infinite loop, repeatedly outputting the exact same phrase without progressing.

Plugins

LongCast 2.5 preview

OpenCode version

1.18.18

Steps to reproduce

1. Start a session in opencode with a large Flutter/Dart project (e.g., editor_screen.dart with 15,828 lines)
2. Ask the model to perform a complex refactoring that requires reading multiple files before implementing (e.g., "refactor the UI to render one text widget per paragraph")
3. The model starts reading the necessary files (paragraph_blocks.dart, inline_text_frame.dart)
4. Instead of proceeding to implementation, the model repeats the same reads indefinitely
5. The loop continues until the user manually interrupts
   Impact:
   Session blocked, impossible to advance the work. No damage to the code (no changes were made), but time and tokens are wasted.
   Possible cause:
   The model may be having difficulty deciding between continuing to read or starting to implement, resulting in a reading loop without progress.

Screenshot and/or share link

https://sshot.online/f/C3un7UY.png

Operating System

Mx Linux

Terminal

xfce4-terminal on MX Linux