Resumed session: "thinking" forever, loop exits at step=0 with no error

Description

Bug Report

Description

When resuming an old session, the UI shows "Thinking" indefinitely. The loop starts at step=0 and immediately exits without ever calling the LLM. No error is displayed to the user.

Expected Behavior

• Show an error message when context exceeds model limits
• Or auto-compact/truncate context to fit within limits
• Or at minimum, exit the "thinking" state and return to input

Actual Behavior

• "Thinking" stays on screen indefinitely
• No error message is shown
• The user must force-quit and start a new session

Logs

loop session.id=ses051a099bcffewokH4M8DUvs8yO step=0
"exiting loop" session.id=ses051a099bcffewokH4M8DUvs8yO
This pattern repeats 12+ times in rapid succession (~200ms each). No process or stream entries appear.

Environment

• opencode v1.17.20
• Linux (Debian 13)
• Models used: Deepseek Reasoner → Big Pickle (switched mid-session)
• Session token count: ~1,470,382 tokens

Additional Context

The session had accumulated many errors over time (rate limits, aborted operations, forbidden access). The compaction agent also fails with the same context overflow (2,135,961 tokens).

Plugins

https://github.com/obra/superpowers.git

OpenCode version

1.17.20

Steps to reproduce

1. Use a session extensively until it accumulates a large context (e.g., >1M tokens)
2. Resume the session with opencode --continue or via the TUI
3. Send any prompt
4. "Thinking" appears but never resolves

Screenshot and/or share link

Operating System

Linux x64-Dev 6.12.100+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.100-1 (2026-07-30) x86_64 GNU/Linux

Terminal

konsole 25.04.2