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From 530eb8da89418b5c216e69c68eaf7c1fca771902 Mon Sep 17 00:00:00 2001
From: Ewout van Mansom <ewout@vanmansom.name>
Date: Sat, 11 Apr 2026 22:07:54 +0200
Subject: [PATCH 2/4] fix: compaction buffer overflow for small context windows
Prevent compaction from failing when the model's context window is too
small to fit the buffer margin, causing infinite compaction loops.
---
packages/opencode/src/session/overflow.ts | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/packages/opencode/src/session/overflow.ts b/packages/opencode/src/session/overflow.ts
index f0e52565d..a4a090b3b 100644
--- a/packages/opencode/src/session/overflow.ts
+++ b/packages/opencode/src/session/overflow.ts
@@ -13,8 +13,9 @@ export function isOverflow(input: { cfg: Config.Info; tokens: MessageV2.Assistan
const count =
input.tokens.total || input.tokens.input + input.tokens.output + input.tokens.cache.read + input.tokens.cache.write
+ const scaledBuffer = Math.min(COMPACTION_BUFFER, Math.floor(context * 0.3))
const reserved =
- input.cfg.compaction?.reserved ?? Math.min(COMPACTION_BUFFER, ProviderTransform.maxOutputTokens(input.model))
+ input.cfg.compaction?.reserved ?? Math.min(scaledBuffer, ProviderTransform.maxOutputTokens(input.model))
const usable = input.model.limit.input
? input.model.limit.input - reserved
: context - ProviderTransform.maxOutputTokens(input.model)
--
2.53.0
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