fix(opencode): accumulate step tokens instead of overwriting - #42326
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Multi-step tool-call messages overwrite assistantMessage.tokens on each step-finish, keeping only the last step's output, reasoning, and cache.write. Accumulate those fields like cost already does, and keep the final step's input and cache.read since its request already includes all prior steps. Fixes anomalyco#42324
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This was referenced Sep 13, 2026
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Issue for this PR
Closes #42324
Type of change
What does this PR do?
In multi-step tool-call messages,
processor.tsoverwritesassistantMessage.tokenson everystep-finishevent, so only the last step's output, reasoning, and cache.write survive — whilecostalready accumulates with+=.This change accumulates the additive fields (output, reasoning, cache.write) across steps.
inputandcache.readkeep the final step's values, because the final step's request already includes all prior steps and accumulating those would double-count.totalkeeps the final step's value as before.This fixes under-reported context metrics and delayed auto-compaction for multi-step messages.
How did you verify your code works?
packages/opencode/test/session/processor-effect.test.tswith distinct per-step usage, asserting the accumulated message tokens.bun typecheckpasses.bun test --timeout 30000 test/session/processor-effect.test.tspasses (one pre-existing failure unrelated to this change, reproducible on clean dev).bun test --timeout 30000 test/session/compaction.test.tspasses.Screenshots / recordings
This is not a UI change.
Checklist