feat(run): forward child session events to NDJSON stream#33403
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When the `task` tool spawns a subagent, its child session events are published on the bus but filtered out of the parent NDJSON stream (`opencode run --format json`). This makes `opencode run` unusable as a headless runtime for multi-agent platforms that need real-time visibility into subagent execution. Two new event types are emitted in `--format json` mode: - `subtask_delta` — streaming token delta from a child session (`childSessionID`, `partID`, `delta`) - `subtask_event` — completed/updated part from a child session (`childSessionID`, `part`) Child sessions are discovered when a `task` tool part transitions to `running` and its metadata exposes `sessionId`. Only events from known child sessions are forwarded; the filter is additive and does not affect any existing event types. Closes anomalyco#33397
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Issue for this PR
Closes #33397
Type of change
What does this PR do?
opencode run --format jsonfilters out all events from child sessions (subagents spawned by thetasktool), so there is no way to observe what a subagent is doing while it runs — only the final result arrives after it completes.The fix tracks child session IDs as task tool parts transition to
running(the ID is already inpart.state.metadata.sessionId) and forwards two new event types to the parent NDJSON stream:subtask_delta— a streaming token delta from a child sessionsubtask_event— a completed/updated part from a child sessionChange is additive: one file touched (
cli/cmd/run.ts, +28 lines), no existing event types or default output affected.How did you verify your code works?
Ran a multi-agent squad workflow (master + 3 subagents: planner → executor → reviewer) coordinated via a custom pipeline MCP. Without the patch, only the final
tool_use completedevent arrives. With the patch, each subagent's tool calls and text appear assubtask_delta/subtask_eventin real time.Screenshots / recordings
N/A — CLI-only change, no UI.
Checklist