Q79: reasoning, encrypted reasoning and signatures survive tool turns

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/main/services/provider-tool-turn.ts

@@ -22,14 +22,29 @@ export interface ToolCall {
   arguments: JsonRecord;
 }
 
+/** The provider's own assistant output, sent back unchanged so reasoning, encrypted reasoning and signatures survive tool turns. */
+export type AssistantReplay =
+  | { format: "responses" | "anthropic" | "bedrock" | "gemini"; content: unknown[] }
+  | { format: "chat"; content: JsonRecord };
+
+export type AssistantTurnMessage = { role: "assistant"; text: string; toolCalls: ToolCall[]; replay?: AssistantReplay };
+
 export type AgentTurnMessage =
   | { role: "user"; text: string }
-  | { role: "assistant"; text: string; toolCalls: ToolCall[] }
+  | AssistantTurnMessage
   | { role: "tool"; results: Array<{ toolCallId: string; toolName: string; output: string }>; followUp?: string };
 
+/** The message's replay when it came from this wire format; a replay from another format is a bug, not something to drop. */
+export function replayIn(message: AssistantTurnMessage, format: AssistantReplay["format"]): AssistantReplay | null {
+  if (!message.replay) return null;
+  if (message.replay.format !== format) throw new Error(`An assistant turn in ${message.replay.format} format cannot be sent to a ${format} provider.`);
+  return message.replay;
+}
+
 export interface AgentTurnResult {
   text: string;
   toolCalls: ToolCall[];
+  replay?: AssistantReplay;
   rawResponseJson: string;
   /** Rate-limit headers of the response, when the provider sent any. */
   rateLimitState?: ProviderObservedRateLimitState | null;