Loop exits silently on orphaned interrupted tool — prompt stays unanswered

When a tool call is cut mid-stream (provider emits tool-input-start without a complete tool-call then drops the connection), the agent loop silently exits without answering the prompt.

Repro:

Mock OpenAI-compatible provider that streams a tool announcement with incomplete arguments then cuts mid-stream
opencode retries; retried request completes with empty finish: "stop"
processor.cleanup() marks the in-flight tool as:

{"type":"tool","tool":"read","callID":"call_orphan_1","state":{"status":"error","input":{},"error":"Tool execution aborted","metadata":{"interrupted":true},"time":{"start":1787392868553,"end":1787392868553}}}

Run loop logs:

WARN loop exit with orphaned interrupted tool session.id=ses_... messageID=msg_... tool=read callID=call_orphan_1
INFO exiting loop session.id=ses_...

Persisted assistant message has no text, zero tokens, time.start == time.end. Prompt stays unanswered, no error surfaced, interrupted tool never fed back as tool_result so model cannot self-correct.

Root cause:

packages/opencode/src/session/processor.ts:cleanup() force-marks abandoned tool as interrupted:true
packages/opencode/src/session/prompt.ts excludes orphaned interrupted tools from hasToolCalls → message judged finished → loop breaks

Expected:
Treat interrupted:true as recoverable tool error: feed Tool execution aborted — please retry with complete arguments back as tool_result and retry (with limit), or after retries emit a user-visible assistant error. Never exit silently with zero tokens.

Also seen: short sessions (83 parts / 113k tokens) and stealth/oxalpha + muse-spark families; also step-finish reason:unknown with zero tokens after Service Unavailable on retry — same silent-exit family.

Verified on: opencode 1.18.21 Linux (and 1.3.13 macOS)

Run a mock OpenAI-compatible provider that streams tool-input-start without complete tool-call then cuts connection mid-stream
Configure opencode.json provider to point to the mock and drive opencode serve via HTTP API with a prompt that triggers a tool
Mock cuts stream → opencode retries → retry returns empty finish: "stop"
Observe WARN loop exit with orphaned interrupted tool + INFO exiting loop and persisted Tool execution aborted part with no assistant text; re-prompting continue still exits silently

OS: Linux (repro verified on 1.18.21), also macOS 15.x darwin
Terminal: via opencode serve HTTP API (zsh / iTerm2)
Plugins: any MCP tool (repro uses generic read)

This issue might be a duplicate of existing issues. Please check:

Interrupted assistant messages retain non-error finish value (orphan tool-input-start abort) #33687: Interrupted assistant messages retain non-error finish value (orphan tool-input-start abort) — describes the same root cause of orphaned tool-input-start on stream abort
Aborted provider stream recorded as clean stop (finish=unknown, zero usage, no text) — subagent returns empty with no error #37852: Aborted provider stream recorded as clean stop (finish=unknown, zero usage, no text) — same silent-exit family with zero tokens / finish=unknown you mention
Session exits silently (exit 0, no error) when a turn returns finish "unknown": prompt.ts:1113 omits it from the loop-exit exclusion #43622: Session exits silently when a turn returns finish "unknown": prompt.ts:1113 omits it from the loop-exit exclusion — same loop-exit / zero-token silent failure
Queued messages are silently dropped when a turn is interrupted #40955: Queued messages are silently dropped when a turn is interrupted — related silent-drop on interruption
message="exiting loop" #38801: message="exiting loop" — tracks the same WARN log you observed

Thanks for the report! OpenCode 2.0 is now out and development is focused on V2, so we're closing issues filed against OpenCode 1. Please upgrade (opencode upgrade --major, details: https://anoma.ly/notes/opencode-2-0), and if this is still relevant on 2.0, reopen this issue or open a new one with your 2.0 version.

— from 𝕺𝖕𝖊𝖓𝕮𝖔𝖉𝖊

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Loop exits silently on orphaned interrupted tool — prompt stays unanswered #44254

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Loop exits silently on orphaned interrupted tool — prompt stays unanswered #44254

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sujalmh commented on Aug 22, 2026

sujalmh commented on Aug 22, 2026

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thdxr commented on Oct 11, 2026

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