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run --format json: final step_finish is missing #54661
Description
With opencode v2.0.26 (9b4ec57) on Linux x86_64, --standalone, model deepseek/deepseek-v4-flash, successful --format json runs never print a step_finish for the final step.
Repro
cd "$(mktemp -d "$HOME/oc-json.XXXXXX")" && git init -q
opencode run --standalone --format json --model deepseek/deepseek-v4-flash "Reply with exactly: OK"
echo "exit=$?"stdout (abbreviated):
{"type":"step_start","part":{"type":"step-start", ...}}
{"type":"text","part":{"type":"text","text":"OK", ...}}exit=0, and no step_finish.
Same in 8/8 JSON runs: two plain replies and six runs with file reads. Runs that call tools print step_finish (reason tool-calls) for every intermediate step, but not for the final one; every stream ends on text.
Expected
The final step's step_finish, with its finish reason, tokens and cost. Those fields are currently missing from stdout for the last step, which is the only step in a plain reply.
Possible cause
From reading packages/cli/src/run/noninteractive.ts (not an instrumented trace): once session.wait resolves, finalizing is set and output is reconciled; from then on the consumer skips every event that is not session.execution.*, including session.step.ended, and reconciliation does not restore step_finish. The subscription is then aborted without draining pending events.
Background: #36413 and #50341 were closed in the V1 freeze with a request to retest on V2. The original empty-stdout symptom did not reproduce on 2.0.26; this report is only about the missing final step_finish.
Activity
opencode-agent commentedon Oct 12, 2026
Thanks for the clear report and for retesting on v2. I think this is a duplicate of #53207, which reports the same missing final
step_finishin the v2opencode run --format jsonclient and points to the same cause inpackages/cli/src/run/noninteractive.ts: oncesession.waitresolves andfinalizingis set, events other thansession.execution.*are skipped, andreconcile()doesn't rebuildstep_finish.Possible duplicates and related issues, ordered by likelihood:
step_finishdropped in plain and tool-call runs), reported on v2.0.22 and still openopencode run --format=jsonemits terminalstep_finishbut never exits #44901: related, closed: the finalstep_finishwas printed but the process never exitedIt would help to add to #53207 that this still happens on 2.0.26 on Linux with
deepseek/deepseek-v4-flash. The bot will close this issue as a duplicate in 1 day unless you reply explaining how your problem is different.opencode-agent commentedon Oct 13, 2026
We haven't heard back, so we're closing this as a duplicate of #53207. That issue covers the same missing final
step_finishfromopencode run --format jsonin the v2 client, with the same suspected cause innoninteractive.ts. Please follow #53207 for updates. If you can, add a note there that it still happens on 2.0.26 on Linux withdeepseek/deepseek-v4-flash. If your problem turns out to be different, reply here and we'll take another look. Thanks for the detailed report!