Fix tool result counting on session restart - #114
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Aug 31, 2026
Real-session replay (fork-1.json) showed prompt guidance alone is not enough: after one good large merge (Opencode-DCP#113: -88.8K/+15.3K), the model fell back to folding a single poll message (Opencode-DCP#114: -121/+453) and writing a merge summary 2.6x larger than what it replaced (Opencode-DCP#115: -6.7K/+17.5K). Both are net-positive context growth - the exact anti-pattern. Add a hard code-level gate: when compress.enforceSummaryShrink is on (default true), the range compress tool rejects any compression whose summary tokens are not strictly smaller than the tokens it replaces (raw messages + consumed child block summaries). The model must rewrite a much more condensed summary or merge existing blocks instead. Adds config key, range-utils helper, tool integration, and unit test.
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Summary
Details
When restarting a session, the tool cache sync was counting all tool results again, including those that had already been pruned. This could cause the pruning threshold to be reached prematurely.
This fix:
clearToolTrackerfunction that resets all tracker state when switching sessionssyncToolCacheto skip already-pruned tools when counting toward the nudge thresholdPruneReasonimport from janitor.tsVersion bump: 0.4.15 → 0.4.16