diff --git a/apps/macos/Sources/Clawdis/InstancesSettings.swift b/apps/macos/Sources/Clawdis/InstancesSettings.swift
index e4d2fb296..bf4d94cfc 100644
--- a/apps/macos/Sources/Clawdis/InstancesSettings.swift
+++ b/apps/macos/Sources/Clawdis/InstancesSettings.swift
@@ -67,6 +67,9 @@ struct InstancesSettings: View {
                 if let version = inst.version {
                     self.label(icon: "shippingbox", text: version)
                 }
+                if let platform = inst.platform, let prettyPlatform = self.prettyPlatform(platform) {
+                    self.label(icon: self.platformIcon(platform), text: prettyPlatform)
+                }
                 self.label(icon: "clock", text: inst.lastInputDescription)
                 if let mode = inst.mode { self.label(icon: "network", text: mode) }
                 if let reason = inst.reason, !reason.isEmpty {
@@ -94,6 +97,52 @@ struct InstancesSettings: View {
         .font(.footnote)
     }
 
+    private func platformIcon(_ raw: String) -> String {
+        let (prefix, _) = self.parsePlatform(raw)
+        switch prefix {
+        case "macos":
+            return "laptopcomputer"
+        case "ios":
+            return "iphone"
+        case "ipados":
+            return "ipad"
+        case "tvos":
+            return "appletv"
+        case "watchos":
+            return "applewatch"
+        default:
+            return "cpu"
+        }
+    }
+
+    private func prettyPlatform(_ raw: String) -> String? {
+        let (prefix, version) = self.parsePlatform(raw)
+        if prefix.isEmpty { return nil }
+        let name: String = switch prefix {
+        case "macos": "macOS"
+        case "ios": "iOS"
+        case "ipados": "iPadOS"
+        case "tvos": "tvOS"
+        case "watchos": "watchOS"
+        default: prefix.prefix(1).uppercased() + prefix.dropFirst()
+        }
+        guard let version, !version.isEmpty else { return name }
+        let parts = version.split(separator: ".").map(String.init)
+        if parts.count >= 2 {
+            return "\(name) \(parts[0]).\(parts[1])"
+        }
+        return "\(name) \(version)"
+    }
+
+    private func parsePlatform(_ raw: String) -> (prefix: String, version: String?) {
+        let trimmed = raw.trimmingCharacters(in: .whitespacesAndNewlines)
+        if trimmed.isEmpty { return ("", nil) }
+        let parts = trimmed.split(whereSeparator: { $0 == " " || $0 == "\t" }).map(String.init)
+        let prefix = parts.first?.lowercased() ?? ""
+        let versionToken = parts.dropFirst().first
+        return (prefix, versionToken)
+    }
+
     private func presenceUpdateSourceText(_ reason: String) -> String {
         let trimmed = reason.trimmingCharacters(in: .whitespacesAndNewlines)
         switch trimmed {
diff --git a/apps/macos/Sources/Clawdis/InstancesStore.swift b/apps/macos/Sources/Clawdis/InstancesStore.swift
index a7f82b9f2..7dad9d3b5 100644
--- a/apps/macos/Sources/Clawdis/InstancesStore.swift
+++ b/apps/macos/Sources/Clawdis/InstancesStore.swift
@@ -8,6 +8,7 @@ struct InstanceInfo: Identifiable, Codable {
     let host: String?
     let ip: String?
     let version: String?
+    let platform: String?
     let lastInputSeconds: Int?
     let mode: String?
     let reason: String?
@@ -145,6 +146,8 @@ final class InstancesStore: ObservableObject {
         let host = Host.current().localizedName ?? "this-mac"
         let ip = Self.primaryIPv4Address()
         let version = Bundle.main.object(forInfoDictionaryKey: "CFBundleShortVersionString") as? String
+        let osVersion = ProcessInfo.processInfo.operatingSystemVersion
+        let platform = "macos \(osVersion.majorVersion).\(osVersion.minorVersion).\(osVersion.patchVersion)"
         let text = "Local node: \(host)\(ip.map { " (\($0))" } ?? "") · app \(version ?? "dev")"
         let ts = Date().timeIntervalSince1970 * 1000
         return InstanceInfo(
@@ -152,6 +155,7 @@ final class InstancesStore: ObservableObject {
             host: host,
             ip: ip,
             version: version,
+            platform: platform,
             lastInputSeconds: Self.lastInputSeconds(),
             mode: "local",
             reason: reason,
@@ -228,6 +232,7 @@ final class InstancesStore: ObservableObject {
                 host: "gateway (health)",
                 ip: nil,
                 version: nil,
+                platform: nil,
                 lastInputSeconds: nil,
                 mode: "health",
                 reason: "health probe",
@@ -276,6 +281,7 @@ final class InstancesStore: ObservableObject {
                 host: entry.host,
                 ip: entry.ip,
                 version: entry.version,
+                platform: entry.platform,
                 lastInputSeconds: entry.lastinputseconds,
                 mode: entry.mode,
                 reason: entry.reason,
@@ -299,6 +305,7 @@ extension InstancesStore {
             host: "steipete-mac",
             ip: "10.0.0.12",
             version: "1.2.3",
+            platform: "macos 26.2.0",
             lastInputSeconds: 12,
             mode: "local",
             reason: "preview",
@@ -309,6 +316,7 @@ extension InstancesStore {
             host: "gateway",
             ip: "100.64.0.2",
             version: "1.2.3",
+            platform: "linux 6.6.0",
             lastInputSeconds: 45,
             mode: "remote",
             reason: "preview",
diff --git a/apps/macos/Sources/ClawdisProtocol/GatewayModels.swift b/apps/macos/Sources/ClawdisProtocol/GatewayModels.swift
index 9d66643c5..c4b4def2b 100644
--- a/apps/macos/Sources/ClawdisProtocol/GatewayModels.swift
+++ b/apps/macos/Sources/ClawdisProtocol/GatewayModels.swift
@@ -167,6 +167,7 @@ public struct PresenceEntry: Codable {
     public let host: String?
     public let ip: String?
     public let version: String?
+    public let platform: String?
     public let mode: String?
     public let lastinputseconds: Int?
     public let reason: String?
@@ -179,6 +180,7 @@ public struct PresenceEntry: Codable {
         host: String?,
         ip: String?,
         version: String?,
+        platform: String?,
         mode: String?,
         lastinputseconds: Int?,
         reason: String?,
@@ -190,6 +192,7 @@ public struct PresenceEntry: Codable {
         self.host = host
         self.ip = ip
         self.version = version
+        self.platform = platform
         self.mode = mode
         self.lastinputseconds = lastinputseconds
         self.reason = reason
@@ -202,6 +205,7 @@ public struct PresenceEntry: Codable {
         case host
         case ip
         case version
+        case platform
         case mode
         case lastinputseconds = "lastInputSeconds"
         case reason
diff --git a/src/gateway/protocol/schema.ts b/src/gateway/protocol/schema.ts
index 3fa266ded..34dae46c7 100644
--- a/src/gateway/protocol/schema.ts
+++ b/src/gateway/protocol/schema.ts
@@ -7,6 +7,7 @@ export const PresenceEntrySchema = Type.Object(
     host: Type.Optional(NonEmptyString),
     ip: Type.Optional(NonEmptyString),
     version: Type.Optional(NonEmptyString),
+    platform: Type.Optional(NonEmptyString),
     mode: Type.Optional(NonEmptyString),
     lastInputSeconds: Type.Optional(Type.Integer({ minimum: 0 })),
     reason: Type.Optional(NonEmptyString),
diff --git a/src/gateway/server.ts b/src/gateway/server.ts
index 5b20e5ee0..5789de48f 100644
--- a/src/gateway/server.ts
+++ b/src/gateway/server.ts
@@ -819,11 +819,13 @@ export async function startGatewayServer(
           const host = node.displayName?.trim() || node.nodeId;
           const ip = node.remoteIp?.trim();
           const version = node.version?.trim() || "unknown";
+          const platform = node.platform?.trim() || undefined;
           const text = `Node: ${host}${ip ? ` (${ip})` : ""} · app ${version} · last input 0s ago · mode remote · reason iris-connected`;
           upsertPresence(node.nodeId, {
             host,
             ip,
             version,
+            platform,
             mode: "remote",
             reason: "iris-connected",
             lastInputSeconds: 0,
@@ -847,11 +849,13 @@ export async function startGatewayServer(
           const host = node.displayName?.trim() || node.nodeId;
           const ip = node.remoteIp?.trim();
           const version = node.version?.trim() || "unknown";
+          const platform = node.platform?.trim() || undefined;
           const text = `Node: ${host}${ip ? ` (${ip})` : ""} · app ${version} · last input 0s ago · mode remote · reason iris-disconnected`;
           upsertPresence(node.nodeId, {
             host,
             ip,
             version,
+            platform,
             mode: "remote",
             reason: "iris-disconnected",
             lastInputSeconds: 0,
@@ -1206,6 +1210,7 @@ export async function startGatewayServer(
               host: connectParams.client.name || os.hostname(),
               ip: isLoopbackAddress(remoteAddr) ? undefined : remoteAddr,
               version: connectParams.client.version,
+              platform: connectParams.client.platform,
               mode: connectParams.client.mode,
               instanceId: connectParams.client.instanceId,
               reason: "connect",
@@ -1824,6 +1829,8 @@ export async function startGatewayServer(
               typeof params.mode === "string" ? params.mode : undefined;
             const version =
               typeof params.version === "string" ? params.version : undefined;
+            const platform =
+              typeof params.platform === "string" ? params.platform : undefined;
             const lastInputSeconds =
               typeof params.lastInputSeconds === "number" &&
               Number.isFinite(params.lastInputSeconds)
@@ -1843,6 +1850,7 @@ export async function startGatewayServer(
               ip,
               mode,
               version,
+              platform,
               lastInputSeconds,
               reason,
               tags,
diff --git a/src/infra/system-presence.ts b/src/infra/system-presence.ts
index ae2e0a9d6..eb90417dc 100644
--- a/src/infra/system-presence.ts
+++ b/src/infra/system-presence.ts
@@ -4,6 +4,7 @@ export type SystemPresence = {
   host?: string;
   ip?: string;
   version?: string;
+  platform?: string;
   lastInputSeconds?: number;
   mode?: string;
   reason?: string;
@@ -46,11 +47,19 @@ function initSelfPresence() {
   const ip = resolvePrimaryIPv4() ?? undefined;
   const version =
     process.env.CLAWDIS_VERSION ?? process.env.npm_package_version ?? "unknown";
+  const platform = (() => {
+    const p = os.platform();
+    const rel = os.release();
+    if (p === "darwin") return `macos ${rel}`;
+    if (p === "win32") return `windows ${rel}`;
+    return `${p} ${rel}`;
+  })();
   const text = `Gateway: ${host}${ip ? ` (${ip})` : ""} · app ${version} · mode gateway · reason self`;
   const selfEntry: SystemPresence = {
     host,
     ip,
     version,
+    platform,
     mode: "gateway",
     reason: "self",
     text,
@@ -113,6 +122,7 @@ type SystemPresencePayload = {
   host?: string;
   ip?: string;
   version?: string;
+  platform?: string;
   lastInputSeconds?: number;
   mode?: string;
   reason?: string;
@@ -136,6 +146,7 @@ export function updateSystemPresence(payload: SystemPresencePayload) {
     host: payload.host ?? parsed.host ?? existing.host,
     ip: payload.ip ?? parsed.ip ?? existing.ip,
     version: payload.version ?? parsed.version ?? existing.version,
+    platform: payload.platform ?? existing.platform,
     mode: payload.mode ?? parsed.mode ?? existing.mode,
     lastInputSeconds:
       payload.lastInputSeconds ??