feat(cron): add --no-agent watchdog toggle gated on hasCronNoAgent

Adds a "Run script only (no agent call)" toggle to the cron job
editor. When ON, the prompt + skills sections dim + disable
visually but stay rendered (no layout shift mid-edit), the
script field stays fully active, and the form passes
`noAgent: true` to `createJob`/`updateJob`. The toggle is hidden
on pre-v0.13 hosts via `supportsNoAgent: hasCronNoAgent` and
defensively stripped at the call site (`hasCronNoAgent ?
form.noAgent : false` on create, `: nil` on edit) — same shape
as the v0.12 `workdir` strip.

Read-side: `HermesCronJob.noAgent: Bool?` is decoded via
`decodeIfPresent` so pre-v0.13 jobs.json files round-trip
unchanged. The display rule `job.noAgent == true` treats
`nil` and `false` identically — a script-only job must opt in.

Write-side:
- `createJob` appends `--no-agent` and passes an empty positional
  prompt (per WS-7-Q5) to keep argparse happy when the prompt is
  the trailing positional.
- `updateJob` sends `--no-agent` / `--agent` to flip the flag in
  edit mode (per WS-7-Q4 — verify the toggle-off spelling on
  integration; if Hermes is one-way, disable the toggle in edit
  mode with a tooltip).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scarf/Packages/ScarfCore/Sources/ScarfCore/Models/HermesCronJob.swift

@@ -28,6 +28,12 @@ public struct HermesCronJob: Identifiable, Sendable, Codable {
     /// job's prompt. YAML-only field today (no `--context-from` CLI
     /// flag yet) — Scarf displays it but doesn't write it.
     public nonisolated let contextFrom: [String]?
+    /// Hermes v0.13+ — script-only watchdog mode. When `true` the
+    /// pre-run script runs but the AI turn is skipped. `nil` means the
+    /// jobs.json file is pre-v0.13 (treat as `false`); `false` is the
+    /// explicit v0.13+ default. Capability-gated on `hasCronNoAgent`
+    /// at all write call sites.
+    public nonisolated let noAgent: Bool?
 
     public enum CodingKeys: String, CodingKey {
         case id, name, prompt, skills, model, schedule, enabled, state, deliver, silent
@@ -41,6 +47,7 @@ public struct HermesCronJob: Identifiable, Sendable, Codable {
         case timeoutSeconds = "timeout_seconds"
         case workdir
         case contextFrom = "context_from"
+        case noAgent = "no_agent"
     }
 
     /// Memberwise init. Swift doesn't synthesize one for us because
@@ -66,7 +73,8 @@ public struct HermesCronJob: Identifiable, Sendable, Codable {
         timeoutSeconds: Int? = nil,
         silent: Bool? = nil,
         workdir: String? = nil,
-        contextFrom: [String]? = nil
+        contextFrom: [String]? = nil,
+        noAgent: Bool? = nil
     ) {
         self.id = id
         self.name = name
@@ -88,6 +96,7 @@ public struct HermesCronJob: Identifiable, Sendable, Codable {
         self.silent = silent
         self.workdir = workdir
         self.contextFrom = contextFrom
+        self.noAgent = noAgent
     }
 
     public nonisolated init(from decoder: any Decoder) throws {
@@ -112,6 +121,7 @@ public struct HermesCronJob: Identifiable, Sendable, Codable {
         self.silent            = try c.decodeIfPresent(Bool.self, forKey: .silent)
         self.workdir           = try c.decodeIfPresent(String.self, forKey: .workdir)
         self.contextFrom       = try c.decodeIfPresent([String].self, forKey: .contextFrom)
+        self.noAgent           = try c.decodeIfPresent(Bool.self, forKey: .noAgent)
     }
 
     public nonisolated func encode(to encoder: any Encoder) throws {
@@ -136,6 +146,7 @@ public struct HermesCronJob: Identifiable, Sendable, Codable {
         try c.encodeIfPresent(silent, forKey: .silent)
         try c.encodeIfPresent(workdir, forKey: .workdir)
         try c.encodeIfPresent(contextFrom, forKey: .contextFrom)
+        try c.encodeIfPresent(noAgent, forKey: .noAgent)
     }
 
     public nonisolated var stateIcon: String {

scarf/scarf/Features/Cron/ViewModels/CronViewModel.swift

@@ -146,7 +146,7 @@ final class CronViewModel {
         }
     }
 
-    func createJob(schedule: String, prompt: String, name: String, deliver: String, skills: [String], script: String, repeatCount: String, workdir: String = "") {
+    func createJob(schedule: String, prompt: String, name: String, deliver: String, skills: [String], script: String, repeatCount: String, workdir: String = "", noAgent: Bool = false) {
         var args = ["cron", "create"]
         if !name.isEmpty { args += ["--name", name] }
         if !deliver.isEmpty { args += ["--deliver", deliver] }
@@ -158,12 +158,25 @@ final class CronViewModel {
         // know the flag — argparse rejects unknown args, so the form
         // omits the flag when the field is empty.
         if !workdir.isEmpty { args += ["--workdir", workdir] }
+        // v0.13+: --no-agent runs the pre-run script and skips the AI turn.
+        // Caller (CronView) strips this on pre-v0.13 hosts so the flag is
+        // never emitted to a Hermes that can't parse it.
+        if noAgent { args.append("--no-agent") }
         args.append(schedule)
-        if !prompt.isEmpty { args.append(prompt) }
+        // TODO(WS-7-Q5): When --no-agent is set Hermes ignores the prompt arg,
+        // but argparse still wants positional args to line up with the
+        // schedule. The plan recommends passing an empty string explicitly so
+        // the positional parser doesn't treat the prompt as missing — verify
+        // this behaviour against `hermes cron create --help` on a v0.13 host.
+        if noAgent {
+            args.append("")
+        } else if !prompt.isEmpty {
+            args.append(prompt)
+        }
         runAndReload(args, success: "Job created")
     }
 
-    func updateJob(id: String, schedule: String?, prompt: String?, name: String?, deliver: String?, repeatCount: String?, newSkills: [String]?, clearSkills: Bool, script: String?, workdir: String? = nil) {
+    func updateJob(id: String, schedule: String?, prompt: String?, name: String?, deliver: String?, repeatCount: String?, newSkills: [String]?, clearSkills: Bool, script: String?, workdir: String? = nil, noAgent: Bool? = nil) {
         var args = ["cron", "edit", id]
         if let schedule, !schedule.isEmpty { args += ["--schedule", schedule] }
         if let prompt, !prompt.isEmpty { args += ["--prompt", prompt] }
@@ -180,6 +193,16 @@ final class CronViewModel {
         // = user cleared an existing workdir; Hermes documents `--workdir ""`
         // on edit as the explicit clear gesture, mirroring the `--script` shape.
         if let workdir { args += ["--workdir", workdir] }
+        // TODO(WS-7-Q4): The toggle-off shape of `--no-agent` on edit is
+        // unverified. Plan assumes Hermes accepts `--agent` to flip the flag
+        // back; if the CLI is one-way (`--no-agent` only), the edit-mode
+        // toggle should disable itself with a tooltip explaining the
+        // limitation. Send the flag in the assumed shape for now and adjust
+        // post-integration.
+        if let noAgent {
+            if noAgent { args.append("--no-agent") }
+            else { args.append("--agent") }
+        }
         runAndReload(args, success: "Updated")
     }
 

scarf/scarf/Features/Cron/Views/CronView.swift

@@ -25,6 +25,10 @@ struct CronView: View {
         capabilitiesStore?.capabilities.hasCronWorkdir ?? false
     }
 
+    private var hasCronNoAgent: Bool {
+        capabilitiesStore?.capabilities.hasCronNoAgent ?? false
+    }
+
     var body: some View {
         VStack(spacing: 0) {
             pageHeader
@@ -47,7 +51,7 @@ struct CronView: View {
         // polling timer. Same wiring ActivityView uses.
         .onChange(of: fileWatcher.lastChangeDate) { viewModel.load() }
         .sheet(isPresented: $viewModel.showCreateSheet) {
-            CronJobEditor(mode: .create, availableSkills: viewModel.availableSkills, supportsWorkdir: hasCronWorkdir) { form in
+            CronJobEditor(mode: .create, availableSkills: viewModel.availableSkills, supportsWorkdir: hasCronWorkdir, supportsNoAgent: hasCronNoAgent) { form in
                 viewModel.createJob(
                     schedule: form.schedule,
                     prompt: form.prompt,
@@ -56,7 +60,12 @@ struct CronView: View {
                     skills: form.skills,
                     script: form.script,
                     repeatCount: form.repeatCount,
-                    workdir: hasCronWorkdir ? form.workdir : ""
+                    workdir: hasCronWorkdir ? form.workdir : "",
+                    // Mirrors the workdir strip-on-pre-version pattern: pre-v0.13
+                    // hosts get a hard `false`, so a stale form value (or a
+                    // hand-edited jobs.json round-tripped through edit-mode)
+                    // can't sneak `--no-agent` into a CLI that doesn't grok it.
+                    noAgent: hasCronNoAgent ? form.noAgent : false
                 )
                 viewModel.showCreateSheet = false
             } onCancel: {
@@ -64,7 +73,7 @@ struct CronView: View {
             }
         }
         .sheet(item: $viewModel.editingJob) { job in
-            CronJobEditor(mode: .edit(job), availableSkills: viewModel.availableSkills, supportsWorkdir: hasCronWorkdir) { form in
+            CronJobEditor(mode: .edit(job), availableSkills: viewModel.availableSkills, supportsWorkdir: hasCronWorkdir, supportsNoAgent: hasCronNoAgent) { form in
                 viewModel.updateJob(
                     id: job.id,
                     schedule: form.schedule,
@@ -75,7 +84,8 @@ struct CronView: View {
                     newSkills: form.skills,
                     clearSkills: form.clearSkills,
                     script: form.script,
-                    workdir: hasCronWorkdir ? form.workdir : nil
+                    workdir: hasCronWorkdir ? form.workdir : nil,
+                    noAgent: hasCronNoAgent ? form.noAgent : nil
                 )
                 viewModel.editingJob = nil
             } onCancel: {
@@ -643,6 +653,9 @@ struct CronJobEditor: View {
         /// v0.12+ workdir flag — fills `--workdir <path>`. Empty string
         /// preserves the v0.11 behaviour of running with no cwd hint.
         var workdir: String = ""
+        /// v0.13+ `--no-agent` flag — script-only watchdog mode. Hermes
+        /// runs the pre-run script and skips the AI turn.
+        var noAgent: Bool = false
     }
 
     let mode: Mode
@@ -650,6 +663,10 @@ struct CronJobEditor: View {
     /// Pass `false` on pre-v0.12 hosts; the `--workdir` field is hidden and
     /// the form's value is dropped when the parent calls `createJob`/`updateJob`.
     let supportsWorkdir: Bool
+    /// Pass `false` on pre-v0.13 hosts; the `--no-agent` toggle is hidden
+    /// and the parent strips the form's value before calling
+    /// `createJob`/`updateJob`. Mirrors the `supportsWorkdir` pattern.
+    let supportsNoAgent: Bool
     let onSave: (FormState) -> Void
     let onCancel: () -> Void
 
@@ -681,12 +698,25 @@ struct CronJobEditor: View {
                     )
                     .scrollContentBackground(.hidden)
             }
+            .opacity(form.noAgent ? 0.4 : 1.0)
+            .disabled(form.noAgent)
             formField("Deliver", text: $form.deliver, placeholder: "origin | local | discord:CHANNEL | telegram:CHAT", mono: true)
             formField("Repeat", text: $form.repeatCount, placeholder: "Optional count")
             formField("Script path", text: $form.script, placeholder: "Python script whose stdout is injected", mono: true)
             if supportsWorkdir {
                 formField("Workdir", text: $form.workdir, placeholder: "Absolute path; pulls AGENTS.md/CLAUDE.md context", mono: true)
             }
+            if supportsNoAgent {
+                Toggle("Run script only (no agent call)", isOn: $form.noAgent)
+                    .scarfStyle(.body)
+                    .tint(ScarfColor.accent)
+                if form.noAgent {
+                    Text("Watchdog mode — Hermes runs the pre-run script and skips the AI turn. Prompt + skills are ignored.")
+                        .scarfStyle(.caption)
+                        .foregroundStyle(ScarfColor.foregroundMuted)
+                        .padding(.leading, ScarfSpace.s3)
+                }
+            }
             if !availableSkills.isEmpty {
                 VStack(alignment: .leading, spacing: 4) {
                     Text("Skills")
@@ -723,6 +753,8 @@ struct CronJobEditor: View {
                             .tint(ScarfColor.accent)
                     }
                 }
+                .opacity(form.noAgent ? 0.4 : 1.0)
+                .disabled(form.noAgent)
             }
             HStack {
                 Spacer()
@@ -746,6 +778,7 @@ struct CronJobEditor: View {
                 form.skills = job.skills ?? []
                 form.script = job.preRunScript ?? ""
                 form.workdir = job.workdir ?? ""
+                form.noAgent = job.noAgent ?? false
             }
         }
     }