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fix(session): add context overflow recovery for long-running sessions #1342

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fix(session): add context overflow recovery for long-running sessions #1342

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18 changes: 18 additions & 0 deletions packages/opencode/src/session/compaction.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -360,7 +360,25 @@ export const layer: Layer.Layer<
model,
})

// Handle overflow with recovery attempt
// See: https://github.com/XiaomiMiMo/MiMo-Code/issues/1221
// Ported from OpenCode commit 820c984d
if (result === "overflow") {
log.warn("context.overflow.detected", {
sessionID: input.sessionID,
messageCount: messages.length,
attemptingRecovery: !replay, // Only attempt recovery on first overflow
})

// If we haven't tried replay yet, attempt to recover by stripping more content
if (!replay) {
log.info("context.overflow.attempting.recovery", { sessionID: input.sessionID })
// Return "text-repeat" to trigger retry with overflow flag
// This allows the caller to strip media and try again
return "text-repeat"
}

// If we already tried replay (stripped media) and still overflow, it's truly too large
processor.message.error = new MessageV2.ContextOverflowError({
message: replay
? "Conversation history too large to compact - exceeds model context limit"
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10 changes: 10 additions & 0 deletions packages/opencode/src/session/processor.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -671,11 +671,21 @@ export const layer: Layer.Layer<
const halt = Effect.fn("SessionProcessor.halt")(function* (e: unknown) {
slog.error("process", { error: errorMessage(e), stack: e instanceof Error ? e.stack : undefined })
const error = parse(e)

// Enhanced context overflow handling with recovery
// See: https://github.com/XiaomiMiMo/MiMo-Code/issues/1221
// Ported from OpenCode commit 820c984d
if (MessageV2.ContextOverflowError.isInstance(error)) {
slog.warn("context.overflow.detected", {
sessionID: ctx.sessionID,
attemptingRecovery: true,
message: error.message,
})
ctx.needsOverflowHandling = true
yield* bus.publish(Session.Event.Error, { sessionID: ctx.sessionID, error })
return
}

ctx.assistantMessage.error = error
yield* bus.publish(Session.Event.Error, {
sessionID: ctx.assistantMessage.sessionID,
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