feat: disable OpenCode compaction and add proactive token budget pruning#21
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tuanhung303 merged 1 commit intomasterfrom Feb 9, 2026
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Replace OpenCode's built-in compaction (which drops all history before a summary) with a plugin-managed proactive pruning strategy that preserves granular context. - Config hook disables OpenCode auto-compaction and tool output pruning - New proactivePrune strategy: at 70% context prunes old tool outputs, at 85% also prunes reasoning blocks - Compacting safety net hook preserves plugin state (todos, tracked files, stats) if compaction ever triggers - Configurable thresholds via TokenBudget schema (warningThreshold, criticalThreshold, targetPercent, protectedRecentTurns) - 13 E2E tests covering all threshold and config scenarios
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Summary
confighook — prevents OpenCode from summarizing and dropping conversation history before the plugin can process itproactivePrunestrategy that manages token budget at the plugin level: prunes old tool outputs at 70% context usage, adds reasoning block pruning at 85%compactinghook preserves plugin state (active todos, tracked files, pruning stats) in any compaction summary if compaction is ever re-enabledProblem
OpenCode's auto-compaction runs before the plugin's
experimental.chat.messages.transformhook, so when it triggers it drops all history — overriding the plugin's granular pruning. The plugin never sees the messages OpenCode already removed.Solution
compaction: { auto: false, prune: false }so OpenCode never triggers its own compactionproactivePrunestrategy replaces OpenCode's role in managing context window pressure with configurable thresholdscompactinghook acts as a last-resort safety net if a user re-enables compaction manuallyFiles Changed
index.tslib/strategies/proactive-prune.tslib/strategies/index.tsproactivePrunelib/hooks.tsproactivePrunein PRUNE_STRATEGIES pipelinelib/config/schema.tsTokenBudgetSchemawith configurable thresholdslib/config/defaults.tstests/e2e/proactive-pruning.test.tstests/hooks.test.tstests/integration/opt-in-defaults.test.tsTest Results
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