fix: emit usage updates from Claude stream events#506
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benbrandt merged 4 commits intoagentclientprotocol:mainfrom Apr 16, 2026
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fix: emit usage updates from Claude stream events#506benbrandt merged 4 commits intoagentclientprotocol:mainfrom
benbrandt merged 4 commits intoagentclientprotocol:mainfrom
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🤖 I have created a release *beep* *boop* --- ## [0.29.1](v0.29.0...v0.29.1) (2026-04-17) ### Bug Fixes * emit usage updates from Claude stream events ([#506](#506)) ([dd67450](dd67450)) * Remove dot from auto mode description ([#561](#561)) ([2ecfa83](2ecfa83)) * Update to claude-agent-sdk 0.2.112 to fix Auto bug with Opus 4.7 ([#562](#562)) ([079614a](079614a)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). Co-authored-by: acp-release-bot[bot] <246668977+acp-release-bot[bot]@users.noreply.github.com>
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Summary
usage_updatenotifications from top-level Claudestream_eventmessage usagemessage_startandmessage_deltaso partial deltas still produce a complete totalresult-path update as the final exact/cost-bearing usage eventWhy
Claude SDK stream events already carry incremental usage on
message_delta, butclaude-agent-acpcurrently ignores that path and only emitsusage_updatefrom the finalresult. This makes usage appear stale until the turn ends in ACP clients that expect live context usage updates.Verification
npm run buildusage_updatenotifications emitted before the final result-path usage updatePatched local smoke-test output included this sequence:
usage_update used=20973 size=200000agent_message_chunk text=TEST_OKusage_update used=20989 size=200000usage_update used=20989 size=1000000 cost=0.1314875