feat(core): emit SubagentProgress for child tool/turn milestones#41
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The `SubagentProgress` event variant exists but until now was never sent —
the subagent task tracker introduced in the previous commit observed
Start and End but had no mid-task signal to update from.
Adds a `synthesize_subagent_progress()` helper called by the mpsc → broadcast
forwarder inside `TaskExecutor::execute_with_task_id`. It translates two
child-loop events into compact progress milestones on the parent broadcast:
- `ToolEnd` → `status = "tool_completed"`, metadata `{ tool, exit_code,
output_bytes, error_kind? }`
- `TurnEnd` → `status = "turn_completed"`, metadata `{ turn, total_tokens,
prompt_tokens, completion_tokens }`
Noisy events (TextDelta / ToolStart / ToolOutputDelta / nested Subagent*)
are intentionally not translated — consumers needing token-level detail
should subscribe to the raw event stream directly.
The original child events are still forwarded unchanged; progress is
additive, so downstream consumers see both the synthesized milestone
and the underlying event.
8 tasks
ZhiXiao-Lin
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that referenced
this pull request
May 23, 2026
Bumps Rust core, Node SDK, and Python SDK to 3.2.0 and documents the subagent task tracker work that landed across #35–#41 + #38. Changes - Bump all five version files (core/sdk Cargo.toml, sdk/node/package.json, sdk/python/pyproject.toml) plus Node lockfiles and Cargo.lock. - Mark SubagentStatus #[non_exhaustive] so future variants are non- breaking. The Cancelled variant added in this release still counts as a breaking change for exhaustive matchers — flagged in the CHANGELOG. - Add a [3.2.0] section to CHANGELOG.md covering: the tracker query API, SubagentProgress emission, the Cancelled status and cancel_subagent_task entry point, Node + Python SDK exposure of all of the above, the regen-stable Node .d.ts split, and the TaskExecutor / register_task_with_mcp signature additions. - Extend README with a "What's new in 3.2" block and a Delegation table that lays out the observe + cancel API across Rust, Node, and Python. Preflight done locally - cargo fmt --all --check - cargo test -p a3s-code-core --lib (1661 passed) - cargo test -p a3s-code-core --tests (all green) - scripts/check_release_versions.sh (consistent at 3.2.0) - (cd sdk/node && npm run build:debug && npm test && npm run test:types) Not run here: release.sh / git tag. This commit is for review only; tagging + publishing happens after the PR lands.
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Summary
The `SubagentProgress` event variant existed but was never emitted — the tracker landed in #35 had no mid-task signal to update from. This PR fills that gap.
Adds `synthesize_subagent_progress()` in `tools/task.rs`, called by the mpsc → broadcast forwarder inside `TaskExecutor::execute_with_task_id`. Translates two child-loop events into compact progress milestones on the parent broadcast:
Noisy events (TextDelta / ToolStart / ToolOutputDelta / nested Subagent*) are intentionally not translated.
Test plan