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Pair with the phoenix-pro Agent icon mapping. Keep Task in the list for backwards compatibility with older sessions / SDKs.
The Claude Code SDK delivers the parent agent's tool calls as a stream of stream_event messages (content_block_start / delta / stop), but the new Agent subagent dispatcher's internal tool calls arrive batched on a single assistant message with parent_tool_use_id set — there is no streaming path. The existing stream_event subagent branch was dead code under the new dispatcher, so the user saw the parent Agent card finish immediately and then nothing until the subagent returned. Extract tool_use blocks from subagent assistant messages and emit aiProgress + aiToolInfo back-to-back per block, registering each tool_use id in _toolUseIdToCounter so the existing tool_result handler can route the response back to the right indicator card. The cards appear once each subagent tool completes (no streaming preview — the SDK never gave us one), but they appear instead of being invisible.
…ed rows Pairs with the phoenix-pro inline-subagent-steps renderer. The backend now looks up the dispatching Agent's toolCounter from _toolUseIdToCounter[message.parent_tool_use_id] and includes it on both aiProgress and aiToolInfo events so the browser knows where to render each step. Styling adds .ai-subagent-steps (left border + indent for the nested block) and .ai-subagent-step / -icon / -label (compact one-line rows with the secondary text size and ellipsis truncation).
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