untested: iOS change for tool call logging

ios/Packages/Sybil/Sources/Sybil/SybilViewModel.swift

@@ -693,7 +693,9 @@ final class SybilViewModel {
         }
 
         let requestMessages: [CompletionRequestMessage] =
-            baseChat.messages.map {
+            baseChat.messages
+            .filter { !$0.isToolCallLog }
+            .map {
                 CompletionRequestMessage(role: $0.role, content: $0.content, name: $0.name)
             } + [CompletionRequestMessage(role: .user, content: content)]
 
@@ -749,6 +751,9 @@ final class SybilViewModel {
         case let .meta(payload):
             pendingChatState?.chatID = payload.chatId
 
+        case let .toolCall(payload):
+            insertPendingToolCallMessage(payload)
+
         case let .delta(payload):
             guard !payload.text.isEmpty else { return }
             mutatePendingAssistantMessage { existing in
@@ -880,6 +885,51 @@ final class SybilViewModel {
         pendingChatState = pending
     }
 
+    private func insertPendingToolCallMessage(_ payload: CompletionStreamToolCall) {
+        guard var pending = pendingChatState else {
+            return
+        }
+
+        if pending.messages.contains(where: { $0.toolCallMetadata?.toolCallId == payload.toolCallId }) {
+            return
+        }
+
+        let metadata: JSONValue = .object([
+            "kind": .string("tool_call"),
+            "toolCallId": .string(payload.toolCallId),
+            "toolName": .string(payload.name),
+            "status": .string(payload.status),
+            "summary": .string(payload.summary),
+            "args": .object(payload.args),
+            "startedAt": .string(payload.startedAt),
+            "completedAt": .string(payload.completedAt),
+            "durationMs": .number(Double(payload.durationMs)),
+            "error": payload.error.map { .string($0) } ?? .null,
+            "resultPreview": payload.resultPreview.map { .string($0) } ?? .null
+        ])
+
+        let summary = payload.summary.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
+            ? "Ran tool '\(payload.name)'."
+            : payload.summary
+
+        let message = Message(
+            id: "temp-tool-\(payload.toolCallId)",
+            createdAt: Date(),
+            role: .tool,
+            content: summary,
+            name: payload.name,
+            metadata: metadata
+        )
+
+        if let assistantIndex = pending.messages.indices.last(where: { pending.messages[$0].id.hasPrefix("temp-assistant-") }) {
+            pending.messages.insert(message, at: assistantIndex)
+        } else {
+            pending.messages.append(message)
+        }
+
+        pendingChatState = pending
+    }
+
     private var currentChatID: String? {
         if draftKind == .chat {
             return nil