fold sub-agent prompts via parent_tool_use_id (T-338)
In live stream-json sessions a sub-agent's spawning prompt is tagged with parent_tool_use_id, not the transcript JSONL's isSidechain + parentUuid. The parser ignored that field, so the prompt parsed as a main-thread user turn and rendered as a blue "you" card above the Activity Agent card instead of folding into it. Carry parent_tool_use_id onto ConversationItem; its presence now marks the item as a sidechain message. The sidechain fold resolves ownership directly by tool-use id (no transcript-only uuid chain to walk), so the prompt folds into its Agent card and the run nests under it as before. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
@@ -182,6 +182,13 @@ class _ConversationViewState extends State<ConversationView> {
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for (final it in items)
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if (it is AssistantToolUse && _isAgentTool(it.name)) it.uuid: it,
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};
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// Stream-json tags sidechain items with the spawning Agent's tool-use id
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// directly (T-338), so map Agent cards by tool-use id for a direct lookup
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// that doesn't depend on the (transcript-only) parentUuid chain.
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final agentByToolUseId = <String, AssistantToolUse>{
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for (final it in items)
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if (it is AssistantToolUse && _isAgentTool(it.name)) it.toolUseId: it,
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};
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// Envelope-level chain info (consistent across items sharing a uuid).
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final parentByUuid = <String, String?>{};
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final sidechainByUuid = <String, bool>{};
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@@ -193,6 +200,13 @@ class _ConversationViewState extends State<ConversationView> {
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}
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AssistantToolUse? resolveOwner(ConversationItem item, AssistantToolUse? nearest) {
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// Direct route: stream-json hands us the spawning Agent's tool-use id on
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// the item itself (T-338) — no chain to walk.
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final byTool = item.parentToolUseId;
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if (byTool != null) {
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final agent = agentByToolUseId[byTool];
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if (agent != null) return agent;
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}
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var cur = item.uuid;
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final seen = <String>{};
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while (seen.add(cur)) {
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@@ -39,7 +39,7 @@ import 'dart:isolate';
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/// Discriminated union of conversation items the reader can emit.
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sealed class ConversationItem {
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const ConversationItem({required this.uuid, required this.timestamp, required this.isSidechain, this.parentUuid});
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const ConversationItem({required this.uuid, required this.timestamp, required this.isSidechain, this.parentUuid, this.parentToolUseId});
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final String uuid;
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final DateTime timestamp;
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@@ -50,6 +50,14 @@ sealed class ConversationItem {
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/// branches off the assistant message that issued its spawning Agent/Task
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/// tool-use, so this links the prompt to the right Agent card (T-263).
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final String? parentUuid;
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/// The `parent_tool_use_id` from the stream-json wire (T-338): the tool-use
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/// id of the Agent/Task call that spawned this sub-agent message. Stream-json
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/// tags every sidechain item with it — the transcript JSONL instead uses
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/// [isSidechain] + [parentUuid]. When present it routes the item straight to
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/// its Agent card by tool-use id, no uuid-chain walk needed, and on its own
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/// marks the item as a sidechain message.
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final String? parentToolUseId;
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}
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/// A user-typed message (plain text, possibly multi-part).
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@@ -59,6 +67,7 @@ final class UserMessage extends ConversationItem {
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required super.timestamp,
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required super.isSidechain,
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super.parentUuid,
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super.parentToolUseId,
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required this.text,
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this.injected = false,
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});
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@@ -82,6 +91,7 @@ final class ToolResultMessage extends ConversationItem {
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required super.timestamp,
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required super.isSidechain,
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super.parentUuid,
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super.parentToolUseId,
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required this.toolUseId,
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required this.content,
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required this.isError,
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@@ -102,6 +112,7 @@ final class AssistantTextMessage extends ConversationItem {
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required super.timestamp,
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required super.isSidechain,
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super.parentUuid,
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super.parentToolUseId,
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required this.text,
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});
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@@ -118,6 +129,7 @@ final class AssistantThinkingMessage extends ConversationItem {
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required super.timestamp,
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required super.isSidechain,
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super.parentUuid,
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super.parentToolUseId,
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required this.thinking,
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});
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@@ -134,6 +146,7 @@ final class AssistantToolUse extends ConversationItem {
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required super.timestamp,
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required super.isSidechain,
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super.parentUuid,
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super.parentToolUseId,
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required this.toolUseId,
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required this.name,
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required this.input,
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@@ -555,9 +568,14 @@ void _parseLineInto(String line, List<ConversationItem> out, List<String> warnin
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if (_skipTypes.contains(type)) return;
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final uuid = envelope['uuid'] as String? ?? '';
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final isSidechain = envelope['isSidechain'] as bool? ?? false;
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final rawParent = envelope['parentUuid'] as String?;
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final parentUuid = (rawParent != null && rawParent.isNotEmpty) ? rawParent : null;
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// Stream-json tags sub-agent messages with `parent_tool_use_id` (the spawning
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// Agent/Task tool-use), not the transcript's isSidechain/parentUuid (T-338).
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// Treat its presence as a sidechain marker so the fold + de-emphasis kick in.
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final rawParentTool = envelope['parent_tool_use_id'] as String?;
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final parentToolUseId = (rawParentTool != null && rawParentTool.isNotEmpty) ? rawParentTool : null;
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final isSidechain = (envelope['isSidechain'] as bool? ?? false) || parentToolUseId != null;
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DateTime timestamp;
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try {
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@@ -568,9 +586,9 @@ void _parseLineInto(String line, List<ConversationItem> out, List<String> warnin
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switch (type) {
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case 'user':
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_parseUserInto(envelope, uuid, timestamp, isSidechain, parentUuid, out);
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_parseUserInto(envelope, uuid, timestamp, isSidechain, parentUuid, parentToolUseId, out);
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case 'assistant':
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_parseAssistantInto(envelope, uuid, timestamp, isSidechain, parentUuid, out);
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_parseAssistantInto(envelope, uuid, timestamp, isSidechain, parentUuid, parentToolUseId, out);
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_extractAssistantStatus(envelope, status);
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default:
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break; // unknown type — degrade gracefully
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@@ -596,6 +614,7 @@ void _parseUserInto(
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DateTime timestamp,
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bool isSidechain,
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String? parentUuid,
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String? parentToolUseId,
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List<ConversationItem> out,
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) {
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final message = envelope['message'] as Map?;
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@@ -609,7 +628,14 @@ void _parseUserInto(
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if (content is String) {
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if (content.isNotEmpty) {
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out.add(UserMessage(uuid: uuid, timestamp: timestamp, isSidechain: isSidechain, parentUuid: parentUuid, text: content, injected: injected));
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out.add(UserMessage(
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uuid: uuid,
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timestamp: timestamp,
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isSidechain: isSidechain,
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parentUuid: parentUuid,
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parentToolUseId: parentToolUseId,
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text: content,
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injected: injected));
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}
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return;
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}
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@@ -629,6 +655,7 @@ void _parseUserInto(
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timestamp: timestamp,
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isSidechain: isSidechain,
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parentUuid: parentUuid,
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parentToolUseId: parentToolUseId,
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toolUseId: item['tool_use_id'] as String? ?? '',
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content: rawContent is String ? rawContent : jsonEncode(rawContent),
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isError: item['is_error'] as bool? ?? false,
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@@ -648,6 +675,7 @@ void _parseAssistantInto(
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DateTime timestamp,
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bool isSidechain,
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String? parentUuid,
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String? parentToolUseId,
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List<ConversationItem> out,
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) {
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final message = envelope['message'] as Map?;
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@@ -661,12 +689,14 @@ void _parseAssistantInto(
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case 'text':
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final text = item['text'] as String? ?? '';
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if (text.isNotEmpty) {
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out.add(AssistantTextMessage(uuid: uuid, timestamp: timestamp, isSidechain: isSidechain, parentUuid: parentUuid, text: text));
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out.add(AssistantTextMessage(
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uuid: uuid, timestamp: timestamp, isSidechain: isSidechain, parentUuid: parentUuid, parentToolUseId: parentToolUseId, text: text));
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}
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case 'thinking':
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final thinking = item['thinking'] as String? ?? '';
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if (thinking.isNotEmpty) {
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out.add(AssistantThinkingMessage(uuid: uuid, timestamp: timestamp, isSidechain: isSidechain, parentUuid: parentUuid, thinking: thinking));
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out.add(AssistantThinkingMessage(
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uuid: uuid, timestamp: timestamp, isSidechain: isSidechain, parentUuid: parentUuid, parentToolUseId: parentToolUseId, thinking: thinking));
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}
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case 'tool_use':
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final rawInput = item['input'];
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@@ -675,6 +705,7 @@ void _parseAssistantInto(
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timestamp: timestamp,
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isSidechain: isSidechain,
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parentUuid: parentUuid,
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parentToolUseId: parentToolUseId,
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toolUseId: item['id'] as String? ?? '',
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name: item['name'] as String? ?? '',
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input: rawInput is Map ? rawInput.cast<String, dynamic>() : <String, dynamic>{},
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