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fix: continue session loop when response is truncated by length (problem with local, smaller LLMs) #39397

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fix: continue session loop when response is truncated by length (problem with local, smaller LLMs) #39397

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41f07ec
fix: continue session loop when response is truncated by length
Jul 28, 2026
7cdaff6
Merge branch 'dev' into fix/continue-on-length-truncation
erkkiat Jul 28, 2026
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13 changes: 12 additions & 1 deletion packages/opencode/src/session/prompt.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -1108,7 +1108,18 @@ const layer = Layer.effect(
(part) => part.type === "tool" && !part.metadata?.providerExecuted && !isOrphanedInterruptedTool(part),
) ?? false

if (
if (lastAssistant?.finish === "length" && !hasToolCalls && lastUser.id < lastAssistant.id) {
// The model hit its output token cap mid-turn (e.g. a heavy reasoning
// model burning its budget on thinking with no room left for the
// answer/tool call). Treat this like "tool-calls": keep looping so a
// fresh step continues from where the truncated message left off,
// instead of silently going idle and waiting for the user to type
// "continue".
yield* Effect.logWarning("continuing loop after truncated (length) finish reason", {
"session.id": sessionID,
messageID: lastAssistant.id,
})
} else if (
lastAssistant?.finish &&
!["tool-calls"].includes(lastAssistant.finish) &&
!hasToolCalls &&
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