Tool execution aborted/terminated — opencode closes chat without waiting for LLM response

Description

Environment:

• OpenCode v1.18.5 (native binary)
• Provider: LM Studio (@ai-sdk/openai-compatible)
• Model: agents-a1-apex (also reproduced with qwen3.6-35b-a3b)
• OS: Windows

Description: During tool execution with local models, opencode closes the chat session without waiting for the LLM to respond. The assistant message is created but never completed — the user sees "Tool execution aborted/terminated" with UnknownError: terminated. Manual "Continue" or starting a new session is required.

Concrete example from production (session ses_12b1b8c0effeS5yD1QNJsmy6IW, project Ritm):

Event | Time -- | -- User sent message "проведи проверку готовности к выполнению плана" | 2026-07-25 07:17:12 Assistant starts responding (LM Studio, agents-a1-apex, build agent) | 2026-07-25 07:17:12 Error: UnknownError / "terminated" — 0 tokens used | 2026-07-25 07:22:48

Duration before abort: ~335 seconds (5.6 min). The assistant message was created but never produced any output — the LLM call was terminated before it could respond.

Root cause (from source code analysis):

• llm.ts — AbortController created inside Stream.scoped, ctrl.abort() fires when the stream scope closes
• processor.ts — cleanup() waits only 250ms for pending tools, then marks them as "Tool execution aborted"
• The fix (PR #34952 by @Mte90) was to emit turn.idle only when both active and ctrl are undefined

Fix status: PR #34952 was closed on Jul 22, 2026 without merge — the author deleted his branch, no reviews received, commits are inaccessible. No release up to v1.18.5 includes the fix.

Plugins

No response

OpenCode version

v1.18.5

Steps to reproduce

Reproduction:

Run opencode with LM Studio and any local model
Give a task requiring tool calls
After 2–3 tool executions, the agent does not receive the LLM response
opencode closes the chat with "Tool execution aborted/terminated"
Only workaround: click "Continue" manually or restart the session
Expected behavior: Tool execution should complete without interruption when using local models. The chat must remain open and wait for the LLM response.

Screenshot and/or share link

Operating System

OS: Windows

Terminal

OpenCode v1.18.5 (native binary)