refactor(cron): simplify main-summary prefix config

apps/macos/Sources/Clawdis/CronSettings.swift

@@ -498,7 +498,6 @@ private struct CronJobEditor: View {
     @State private var thinking: String = ""
     @State private var timeoutSeconds: String = ""
     @State private var bestEffortDeliver: Bool = false
-    @State private var postToMain: Bool = false
     @State private var postPrefix: String = "Cron"
 
     var body: some View {
@@ -568,12 +567,12 @@ private struct CronJobEditor: View {
                     }
                 }
 
-                if self.payloadKind == .agentTurn {
-                    Section("Post summary to main (optional)") {
-                        Toggle("Post to main", isOn: self.$postToMain)
-                        if self.postToMain {
-                            TextField("Prefix", text: self.$postPrefix)
-                        }
+                if self.payloadKind == .agentTurn || self.sessionTarget == .isolated {
+                    Section("Main session summary") {
+                        Text("Isolated jobs always post a summary back into the main session when they finish.")
+                            .font(.caption)
+                            .foregroundStyle(.secondary)
+                        TextField("Prefix", text: self.$postPrefix)
                     }
                 }
             }
@@ -666,7 +665,6 @@ private struct CronJobEditor: View {
             self.bestEffortDeliver = bestEffortDeliver ?? false
         }
 
-        self.postToMain = job.isolation?.postToMain ?? false
         self.postPrefix = job.isolation?.postToMainPrefix ?? "Cron"
     }
 
@@ -746,17 +744,11 @@ private struct CronJobEditor: View {
         ]
         if !name.isEmpty { root["name"] = name }
 
-        if self.payloadKind == .agentTurn || self.sessionTarget == .isolated {
-            if self.postToMain {
-                root["isolation"] = [
-                    "postToMain": true,
-                    "postToMainPrefix": self.postPrefix.trimmingCharacters(in: .whitespacesAndNewlines)
-                        .isEmpty ? "Cron" : self.postPrefix,
-                ]
-            } else if self.job != nil {
-                // Allow clearing isolation on edit.
-                root["isolation"] = ["postToMain": false]
-            }
+        if payload["kind"] as? String == "agentTurn" || self.sessionTarget == .isolated {
+            let trimmed = self.postPrefix.trimmingCharacters(in: .whitespacesAndNewlines)
+            root["isolation"] = [
+                "postToMainPrefix": trimmed.isEmpty ? "Cron" : trimmed,
+            ]
         }
 
         return root
@@ -839,7 +831,7 @@ struct CronSettings_Previews: PreviewProvider {
                     channel: "last",
                     to: nil,
                     bestEffortDeliver: true),
-                isolation: CronIsolation(postToMain: true, postToMainPrefix: "Cron"),
+                isolation: CronIsolation(postToMain: nil, postToMainPrefix: "Cron"),
                 state: CronJobState(
                     nextRunAtMs: Int(Date().addingTimeInterval(3600).timeIntervalSince1970 * 1000),
                     runningAtMs: nil,

docs/cron.md

@@ -77,6 +77,7 @@ Each job is a JSON object with stable keys (unknown keys ignored for forward com
   - `{"kind":"agentTurn","message":string,"deliver"?:boolean,"channel"?: "last"|"whatsapp"|"telegram","to"?:string,"timeoutSeconds"?:number}`
 - `isolation` (optional; only meaningful for isolated jobs)
   - `{"postToMain"?: boolean, "postToMainPrefix"?: string}`
+  - Note: `postToMain` is deprecated (no-op). Isolated jobs always post a summary; only the prefix is configurable.
 - `runtime` (optional)
   - `{"maxAttempts"?:number,"retryBackoffMs"?:number}` (best-effort retries; defaults off)
 - `state` (runtime-maintained)

src/cli/cron-cli.ts

@@ -163,11 +163,7 @@ export function registerCronCli(program: Command) {
         "Do not fail the job if delivery fails",
         false,
       )
-      .option(
-        "--post-to-main",
-        "Deprecated: isolated jobs always post a summary to main; use --post-prefix to customize",
-        false,
-      )
+      .option("--post-to-main", "Deprecated (no-op)", false)
       .option(
         "--post-prefix <prefix>",
         "Prefix for summary system event",
@@ -271,12 +267,16 @@ export function registerCronCli(program: Command) {
             );
           }
 
-          const isolation = opts.postToMain
-            ? {
-                postToMain: true,
-                postToMainPrefix: String(opts.postPrefix ?? "Cron"),
-              }
-            : undefined;
+          const isolation =
+            payload.kind === "agentTurn"
+              ? {
+                  postToMainPrefix:
+                    typeof opts.postPrefix === "string" &&
+                    opts.postPrefix.trim()
+                      ? opts.postPrefix.trim()
+                      : "Cron",
+                }
+              : undefined;
 
           const params = {
             name:
@@ -347,11 +347,7 @@ export function registerCronCli(program: Command) {
         "Do not fail job if delivery fails",
         false,
       )
-      .option(
-        "--post-to-main",
-        "Deprecated: isolated jobs always post a summary to main; use --post-prefix to customize",
-        false,
-      )
+      .option("--post-to-main", "Deprecated (no-op)", false)
       .option("--post-prefix <prefix>", "Prefix for summary system event")
       .action(async (id, opts) => {
         try {
@@ -420,11 +416,11 @@ export function registerCronCli(program: Command) {
             };
           }
 
-          if (opts.postToMain) {
+          if (typeof opts.postPrefix === "string") {
             patch.isolation = {
-              postToMain: true,
-              postToMainPrefix:
-                typeof opts.postPrefix === "string" ? opts.postPrefix : "Cron",
+              postToMainPrefix: opts.postPrefix.trim()
+                ? opts.postPrefix
+                : "Cron",
             };
           }