untested: iOS change for tool call logging

ios/Packages/Sybil/Sources/Sybil/SybilAPIClient.swift

@@ -125,6 +125,9 @@ actor SybilAPIClient {
             case "meta":
                 let payload: CompletionStreamMeta = try Self.decodeEvent(dataText, as: CompletionStreamMeta.self, eventName: eventName)
                 await onEvent(.meta(payload))
+            case "tool_call":
+                let payload: CompletionStreamToolCall = try Self.decodeEvent(dataText, as: CompletionStreamToolCall.self, eventName: eventName)
+                await onEvent(.toolCall(payload))
             case "delta":
                 let payload: CompletionStreamDelta = try Self.decodeEvent(dataText, as: CompletionStreamDelta.self, eventName: eventName)
                 await onEvent(.delta(payload))

ios/Packages/Sybil/Sources/Sybil/SybilChatTranscriptView.swift

@@ -71,6 +71,10 @@ private struct MessageBubble: View {
     var message: Message
     var isSending: Bool
 
+    private var toolCallMetadata: ToolCallMetadata? {
+        message.toolCallMetadata
+    }
+
     private var isUser: Bool {
         message.role == .user
     }
@@ -83,6 +87,12 @@ private struct MessageBubble: View {
 
     var body: some View {
         HStack {
+            if let toolCallMetadata {
+                ToolCallActivityChip(
+                    metadata: toolCallMetadata,
+                    fallbackContent: message.content
+                )
+            } else {
                 VStack(alignment: .leading, spacing: 8) {
                     if isPendingAssistant {
                         HStack(spacing: 8) {
@@ -123,4 +133,58 @@ private struct MessageBubble: View {
                 .frame(maxWidth: isUser ? 420 : nil, alignment: isUser ? .trailing : .leading)
             }
         }
+    }
+}
+
+private struct ToolCallActivityChip: View {
+    var metadata: ToolCallMetadata
+    var fallbackContent: String
+
+    private var summary: String {
+        if let text = metadata.summary?.trimmingCharacters(in: .whitespacesAndNewlines), !text.isEmpty {
+            return text
+        }
+        if !fallbackContent.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty {
+            return fallbackContent
+        }
+        return "Ran tool '\(metadata.toolName ?? "unknown_tool")'."
+    }
+
+    private var iconName: String {
+        let name = (metadata.toolName ?? "").lowercased()
+        if name.contains("search") {
+            return "globe"
+        }
+        if name.contains("url") || name.contains("fetch") || name.contains("http") {
+            return "link"
+        }
+        return "wrench.and.screwdriver"
+    }
+
+    private var isFailed: Bool {
+        (metadata.status ?? "").lowercased() == "failed"
+    }
+
+    var body: some View {
+        HStack(spacing: 8) {
+            Image(systemName: iconName)
+                .font(.system(size: 12, weight: .semibold))
+                .foregroundStyle(isFailed ? SybilTheme.danger : SybilTheme.primary)
+            Text(summary)
+                .font(.caption)
+                .foregroundStyle(isFailed ? SybilTheme.danger.opacity(0.95) : SybilTheme.text.opacity(0.9))
+                .fixedSize(horizontal: false, vertical: true)
+        }
+        .padding(.horizontal, 10)
+        .padding(.vertical, 7)
+        .background(
+            RoundedRectangle(cornerRadius: 10)
+                .fill((isFailed ? SybilTheme.danger : SybilTheme.primary).opacity(0.12))
+                .overlay(
+                    RoundedRectangle(cornerRadius: 10)
+                        .stroke((isFailed ? SybilTheme.danger : SybilTheme.primary).opacity(0.35), lineWidth: 1)
+                )
+        )
+        .frame(maxWidth: 460, alignment: .leading)
+    }
 }

ios/Packages/Sybil/Sources/Sybil/SybilModels.swift

@@ -46,6 +46,102 @@ public struct Message: Codable, Identifiable, Hashable, Sendable {
     public var role: MessageRole
     public var content: String
     public var name: String?
+    public var metadata: JSONValue? = nil
+
+    public var toolCallMetadata: ToolCallMetadata? {
+        guard role == .tool,
+              let object = metadata?.objectValue,
+              object["kind"]?.stringValue == "tool_call"
+        else { return nil }
+
+        return ToolCallMetadata(
+            toolCallId: object["toolCallId"]?.stringValue,
+            toolName: object["toolName"]?.stringValue ?? name,
+            status: object["status"]?.stringValue,
+            summary: object["summary"]?.stringValue
+        )
+    }
+
+    public var isToolCallLog: Bool {
+        toolCallMetadata != nil
+    }
+}
+
+public struct ToolCallMetadata: Hashable, Sendable {
+    public var toolCallId: String?
+    public var toolName: String?
+    public var status: String?
+    public var summary: String?
+}
+
+public enum JSONValue: Codable, Hashable, Sendable {
+    case string(String)
+    case number(Double)
+    case bool(Bool)
+    case object([String: JSONValue])
+    case array([JSONValue])
+    case null
+
+    public init(from decoder: Decoder) throws {
+        let container = try decoder.singleValueContainer()
+        if container.decodeNil() {
+            self = .null
+            return
+        }
+        if let value = try? container.decode(Bool.self) {
+            self = .bool(value)
+            return
+        }
+        if let value = try? container.decode(Double.self) {
+            self = .number(value)
+            return
+        }
+        if let value = try? container.decode(String.self) {
+            self = .string(value)
+            return
+        }
+        if let value = try? container.decode([String: JSONValue].self) {
+            self = .object(value)
+            return
+        }
+        if let value = try? container.decode([JSONValue].self) {
+            self = .array(value)
+            return
+        }
+        throw DecodingError.dataCorruptedError(in: container, debugDescription: "Unsupported JSON value")
+    }
+
+    public func encode(to encoder: Encoder) throws {
+        var container = encoder.singleValueContainer()
+        switch self {
+        case let .string(value):
+            try container.encode(value)
+        case let .number(value):
+            try container.encode(value)
+        case let .bool(value):
+            try container.encode(value)
+        case let .object(value):
+            try container.encode(value)
+        case let .array(value):
+            try container.encode(value)
+        case .null:
+            try container.encodeNil()
+        }
+    }
+
+    public var stringValue: String? {
+        if case let .string(value) = self {
+            return value
+        }
+        return nil
+    }
+
+    public var objectValue: [String: JSONValue]? {
+        if case let .object(value) = self {
+            return value
+        }
+        return nil
+    }
 }
 
 public struct ChatDetail: Codable, Identifiable, Hashable, Sendable {
@@ -153,12 +249,26 @@ public struct CompletionStreamDone: Codable, Sendable {
     public var text: String
 }
 
+public struct CompletionStreamToolCall: Codable, Sendable {
+    public var toolCallId: String
+    public var name: String
+    public var status: String
+    public var summary: String
+    public var args: [String: JSONValue]
+    public var startedAt: String
+    public var completedAt: String
+    public var durationMs: Int
+    public var error: String?
+    public var resultPreview: String?
+}
+
 public struct StreamErrorPayload: Codable, Sendable {
     public var message: String
 }
 
 public enum CompletionStreamEvent: Sendable {
     case meta(CompletionStreamMeta)
+    case toolCall(CompletionStreamToolCall)
     case delta(CompletionStreamDelta)
     case done(CompletionStreamDone)
     case error(StreamErrorPayload)

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