Merge pull request #88 from awizemann/ws-3-kanban-v0.13

feat(kanban): v0.13 diagnostics + recovery UX (WS-3)

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

@@ -0,0 +1,158 @@
+import Foundation
+
+/// A structured signal Hermes emits when it observes worker / task
+/// distress. Hermes v0.13 introduced a generic diagnostics engine that
+/// attaches these to a task (cross-run signals) and/or a run (per-attempt
+/// signals). Pre-v0.13 hosts never emit diagnostics so the array decodes
+/// empty and downstream UI no-ops.
+///
+/// **Wire shape (best inference from release notes — verify against live
+/// JSON during integration):** an array of objects with `kind`, optional
+/// `message`, optional `detected_at` (ISO-8601 string OR Unix integer,
+/// matching the rest of `HermesKanbanTask`'s timestamp tolerance).
+///
+/// **Forward compat:** `kind` stays a `String` so a future Hermes can
+/// add new diagnostic kinds without a Scarf release. `KanbanDiagnosticKind`
+/// is the typed mirror — it falls back to `.unknown` for unrecognized
+/// kinds and renders the raw string verbatim.
+public struct HermesKanbanDiagnostic: Sendable, Equatable, Identifiable, Codable {
+    /// Synthetic id — not on the wire. Lets SwiftUI `ForEach` over a
+    /// diagnostic array without forcing a deterministic id from the
+    /// server (Hermes doesn't currently mint one).
+    public let id: UUID
+    /// Wire-side `kind` string. Compared case-insensitively via
+    /// `KanbanDiagnosticKind.from(_:)`.
+    public let kind: String
+    /// Human-friendly elaboration ("no heartbeat for 4m20s", "exit code
+    /// 0 with no complete call", etc.). May be nil; render the raw
+    /// `kind` then.
+    public let message: String?
+    /// ISO-8601 string. Decoder accepts Unix integer seconds (Hermes's
+    /// SQLite-backed shape) and converts to ISO-8601 so consumers see
+    /// one type — same pattern as `HermesKanbanTask.decodeFlexibleTimestamp`.
+    public let detectedAt: String?
+
+    public init(
+        kind: String,
+        message: String? = nil,
+        detectedAt: String? = nil
+    ) {
+        self.id = UUID()
+        self.kind = kind
+        self.message = message
+        self.detectedAt = detectedAt
+    }
+
+    enum CodingKeys: String, CodingKey {
+        case kind
+        case message
+        case detectedAt = "detected_at"
+    }
+
+    public init(from decoder: any Decoder) throws {
+        let c = try decoder.container(keyedBy: CodingKeys.self)
+        self.id = UUID()
+        self.kind = try c.decodeIfPresent(String.self, forKey: .kind) ?? "unknown"
+        self.message = try c.decodeIfPresent(String.self, forKey: .message)
+        // Flexible timestamp decode mirrors HermesKanbanTask's pattern.
+        if !c.contains(.detectedAt) {
+            self.detectedAt = nil
+        } else if let unix = try? c.decodeIfPresent(Double.self, forKey: .detectedAt) {
+            let date = Date(timeIntervalSince1970: unix)
+            self.detectedAt = Self.isoFormatter.string(from: date)
+        } else {
+            self.detectedAt = try c.decodeIfPresent(String.self, forKey: .detectedAt)
+        }
+    }
+
+    public func encode(to encoder: any Encoder) throws {
+        var c = encoder.container(keyedBy: CodingKeys.self)
+        try c.encode(kind, forKey: .kind)
+        try c.encodeIfPresent(message, forKey: .message)
+        try c.encodeIfPresent(detectedAt, forKey: .detectedAt)
+    }
+
+    public static func == (lhs: HermesKanbanDiagnostic, rhs: HermesKanbanDiagnostic) -> Bool {
+        // Compare on wire fields, not synthetic id — round-trip decoding
+        // mints fresh ids.
+        lhs.kind == rhs.kind
+            && lhs.message == rhs.message
+            && lhs.detectedAt == rhs.detectedAt
+    }
+
+    private static let isoFormatter: ISO8601DateFormatter = {
+        let f = ISO8601DateFormatter()
+        f.formatOptions = [.withInternetDateTime]
+        return f
+    }()
+}
+
+// MARK: - Typed mirror
+
+/// Typed view of `HermesKanbanDiagnostic.kind`. Models keep the raw
+/// string for forward compatibility; UI helpers read this enum to pick
+/// the right glyph + tint without string-matching at every callsite.
+///
+/// `unknown` is the fallback for any kind a future Hermes adds that
+/// Scarf doesn't recognize. Views render the raw string verbatim in
+/// that case so the user still sees what Hermes flagged.
+// TODO(WS-3-Q5): The exact `kind` string for darwin-zombie detection is
+// inferred from the v0.13 release notes ("Detect darwin zombie workers");
+// confirm against live `hermes kanban show --json` output during
+// integration. Same for `worker_exit_no_complete` and the heartbeat-stalled
+// kinds — typed mirror falls through to `.unknown` if the wire string
+// drifts, and the raw string is still rendered.
+public enum KanbanDiagnosticKind: String, Sendable, CaseIterable {
+    case heartbeatStalled = "heartbeat_stalled"
+    case toolErrorLoop = "tool_error_loop"
+    case retryCapHit = "retry_cap_hit"
+    case unboundedRetry = "unbounded_retry"
+    case darwinZombieDetected = "darwin_zombie_detected"
+    case spawnFailure = "spawn_failure"
+    case workerExitNoComplete = "worker_exit_no_complete"
+    case unknown
+
+    /// Map a wire string (case-insensitive) to a typed kind. Unknown
+    /// values fall through to `.unknown` so callers can still surface
+    /// the raw string.
+    public static func from(_ raw: String) -> KanbanDiagnosticKind {
+        KanbanDiagnosticKind(rawValue: raw.lowercased()) ?? .unknown
+    }
+
+    /// SF Symbol name to render alongside the diagnostic. View code
+    /// reaches through the typed enum so glyph choices live in one
+    /// place.
+    public var glyphName: String {
+        switch self {
+        case .heartbeatStalled:     return "waveform.path.badge.minus"
+        case .toolErrorLoop:        return "arrow.triangle.2.circlepath.exclamationmark"
+        case .retryCapHit:          return "nosign"
+        case .unboundedRetry:       return "arrow.clockwise.circle.fill"
+        case .darwinZombieDetected: return "apple.logo"
+        case .spawnFailure:         return "bolt.slash"
+        case .workerExitNoComplete: return "figure.walk.departure"
+        case .unknown:              return "stethoscope"
+        }
+    }
+
+    /// Severity tier for this kind — drives badge tint. `.danger` for
+    /// terminal-class signals (retry cap hit, zombie, spawn failure);
+    /// `.warning` for recoverable signals (heartbeat stalled, tool
+    /// error loop); `.neutral` only for unknown / forward-compat kinds.
+    public var severity: DiagnosticSeverity {
+        switch self {
+        case .retryCapHit, .darwinZombieDetected, .spawnFailure:
+            return .danger
+        case .heartbeatStalled, .toolErrorLoop, .unboundedRetry, .workerExitNoComplete:
+            return .warning
+        case .unknown:
+            return .neutral
+        }
+    }
+
+    public enum DiagnosticSeverity: Sendable {
+        case warning
+        case danger
+        case neutral
+    }
+}

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

@@ -24,6 +24,19 @@ public struct HermesKanbanRun: Sendable, Equatable, Identifiable, Codable {
     /// raw string so we don't lock the typed shape.
     public let metadataJSON: String?
 
+    // v0.13 (v2026.5.7) fields. Both Optional / empty-default so a v0.12
+    // host's run row decodes without error.
+    /// Per-attempt distress signals. Cross-run signals (retry cap hit,
+    /// etc.) hang off `HermesKanbanTask.diagnostics`; in-flight signals
+    /// (heartbeat stalled, darwin zombie detected) attach here.
+    public let diagnostics: [HermesKanbanDiagnostic]
+    /// Server-side unified failure counter (renamed from three separate
+    /// spawn / timeout / crash counters in v0.13). Optional — when nil,
+    /// callers fall back to counting failed runs in the runs array.
+    // TODO(WS-3-Q4): Verify whether v0.13 exposes this field on the per-run
+    // shape OR only at the task level. Tolerant decode handles either.
+    public let failureCount: Int?
+
     public init(
         id: Int,
         taskId: String,
@@ -40,7 +53,9 @@ public struct HermesKanbanRun: Sendable, Equatable, Identifiable, Codable {
         outcome: String? = nil,
         summary: String? = nil,
         error: String? = nil,
-        metadataJSON: String? = nil
+        metadataJSON: String? = nil,
+        diagnostics: [HermesKanbanDiagnostic] = [],
+        failureCount: Int? = nil
     ) {
         self.id = id
         self.taskId = taskId
@@ -58,6 +73,8 @@ public struct HermesKanbanRun: Sendable, Equatable, Identifiable, Codable {
         self.summary = summary
         self.error = error
         self.metadataJSON = metadataJSON
+        self.diagnostics = diagnostics
+        self.failureCount = failureCount
     }
 
     enum CodingKeys: String, CodingKey {
@@ -77,6 +94,8 @@ public struct HermesKanbanRun: Sendable, Equatable, Identifiable, Codable {
         case summary
         case error
         case metadata
+        case diagnostics
+        case failureCount = "failure_count"
     }
 
     public init(from decoder: any Decoder) throws {
@@ -120,6 +139,11 @@ public struct HermesKanbanRun: Sendable, Equatable, Identifiable, Codable {
         } else {
             self.metadataJSON = nil
         }
+
+        // v0.13 diagnostics array — `try?` so a malformed entry doesn't
+        // poison the whole run row. Empty default for pre-v0.13 hosts.
+        self.diagnostics = (try? c.decodeIfPresent([HermesKanbanDiagnostic].self, forKey: .diagnostics)) ?? []
+        self.failureCount = try c.decodeIfPresent(Int.self, forKey: .failureCount)
     }
 
     public func encode(to encoder: any Encoder) throws {
@@ -140,5 +164,7 @@ public struct HermesKanbanRun: Sendable, Equatable, Identifiable, Codable {
         try c.encodeIfPresent(summary, forKey: .summary)
         try c.encodeIfPresent(error, forKey: .error)
         try c.encodeIfPresent(metadataJSON, forKey: .metadata)
+        try c.encode(diagnostics, forKey: .diagnostics)
+        try c.encodeIfPresent(failureCount, forKey: .failureCount)
     }
 }

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

@@ -9,8 +9,9 @@ import Foundation
 /// `link`/`unlink`, `comment`, `dispatch`).
 ///
 /// Hermes has no `update` verb — `priority` / `title` / `body` /
-/// `tenant` are write-once at create time. Mutations after that are
+/// `tenant` / `max_retries` are write-once at create time. Mutations
-/// expressed as state transitions (status, assignee) or new comments.
+/// after that are expressed as state transitions (status, assignee) or
+/// new comments.
 public struct HermesKanbanTask: Sendable, Equatable, Identifiable, Codable {
     public let id: String
     public let title: String
@@ -34,6 +35,29 @@ public struct HermesKanbanTask: Sendable, Equatable, Identifiable, Codable {
     public let maxRuntimeSeconds: Int?
     public let currentRunId: Int?
 
+    // v0.13 (v2026.5.7) reliability + recovery fields. All Optional with
+    // `nil` decoded for pre-v0.13 hosts so the v2.7.5 surface keeps
+    // rendering unchanged when the connected Hermes hasn't shipped them.
+    /// Per-task retry budget set at create time via `--max-retries N`.
+    /// Hermes pattern is write-once — no `set_max_retries` verb. Scarf
+    /// surfaces this read-only on the inspector header.
+    public let maxRetries: Int?
+    /// Server-supplied reason a task was auto-blocked (e.g. "worker
+    /// exited (code 0) without calling `kanban complete`"). Surfaced
+    /// verbatim in the inspector banner.
+    public let autoBlockedReason: String?
+    /// `pending` / `verified` / `rejected` / nil. Pending means a worker
+    /// claimed it created this card but Hermes hasn't confirmed the
+    /// underlying work exists. Read through `KanbanHallucinationGate.from`
+    /// to map to a typed mirror — kept as a String at the wire level so
+    /// Hermes can add new gate states (e.g. `quarantined`) without a
+    /// Scarf release.
+    public let hallucinationGateStatus: String?
+    /// Cross-run distress signals (retry cap hit, etc.). Per-run signals
+    /// hang off `HermesKanbanRun.diagnostics`. Empty array for pre-v0.13
+    /// hosts AND for tasks the diagnostics engine hasn't flagged.
+    public let diagnostics: [HermesKanbanDiagnostic]
+
     public init(
         id: String,
         title: String,
@@ -53,7 +77,11 @@ public struct HermesKanbanTask: Sendable, Equatable, Identifiable, Codable {
         idempotencyKey: String? = nil,
         lastHeartbeatAt: String? = nil,
         maxRuntimeSeconds: Int? = nil,
-        currentRunId: Int? = nil
+        currentRunId: Int? = nil,
+        maxRetries: Int? = nil,
+        autoBlockedReason: String? = nil,
+        hallucinationGateStatus: String? = nil,
+        diagnostics: [HermesKanbanDiagnostic] = []
     ) {
         self.id = id
         self.title = title
@@ -74,6 +102,10 @@ public struct HermesKanbanTask: Sendable, Equatable, Identifiable, Codable {
         self.lastHeartbeatAt = lastHeartbeatAt
         self.maxRuntimeSeconds = maxRuntimeSeconds
         self.currentRunId = currentRunId
+        self.maxRetries = maxRetries
+        self.autoBlockedReason = autoBlockedReason
+        self.hallucinationGateStatus = hallucinationGateStatus
+        self.diagnostics = diagnostics
     }
 
     enum CodingKeys: String, CodingKey {
@@ -89,6 +121,10 @@ public struct HermesKanbanTask: Sendable, Equatable, Identifiable, Codable {
         case lastHeartbeatAt = "last_heartbeat_at"
         case maxRuntimeSeconds = "max_runtime_seconds"
         case currentRunId = "current_run_id"
+        case maxRetries = "max_retries"
+        case autoBlockedReason = "auto_blocked_reason"
+        case hallucinationGateStatus = "hallucination_gate_status"
+        case diagnostics
     }
 
     public init(from decoder: any Decoder) throws {
@@ -117,6 +153,17 @@ public struct HermesKanbanTask: Sendable, Equatable, Identifiable, Codable {
         self.lastHeartbeatAt = try Self.decodeFlexibleTimestamp(c, forKey: .lastHeartbeatAt)
         self.maxRuntimeSeconds = try c.decodeIfPresent(Int.self, forKey: .maxRuntimeSeconds)
         self.currentRunId = try c.decodeIfPresent(Int.self, forKey: .currentRunId)
+        // v0.13 fields — every one is `decodeIfPresent` so a v0.12 host's
+        // task row decodes successfully with these all nil/empty. The
+        // tolerant-decode contract is pinned by KanbanModelsTests.
+        self.maxRetries = try c.decodeIfPresent(Int.self, forKey: .maxRetries)
+        self.autoBlockedReason = try c.decodeIfPresent(String.self, forKey: .autoBlockedReason)
+        self.hallucinationGateStatus = try c.decodeIfPresent(String.self, forKey: .hallucinationGateStatus)
+        // Wrap diagnostics decode in `try?` so a single malformed entry
+        // (or the whole array being the wrong shape) doesn't poison the
+        // task row — the rest of the decoder still produces a usable
+        // task. Empty default matches the `skills` pattern.
+        self.diagnostics = (try? c.decodeIfPresent([HermesKanbanDiagnostic].self, forKey: .diagnostics)) ?? []
     }
 
     /// Decode a timestamp that may arrive as a Unix integer or an
@@ -209,3 +256,27 @@ public enum KanbanBoardColumn: String, Sendable, CaseIterable, Identifiable {
         .triage, .upNext, .running, .blocked, .done
     ]
 }
+
+// MARK: - Hallucination gate (v0.13)
+
+/// Typed mirror of Hermes v0.13's hallucination-gate state. Worker-created
+/// cards land in `pending` until something verifies the underlying work
+/// exists; Scarf surfaces a Verify / Reject UX above the task body so the
+/// user can act as the verification gate.
+///
+/// Kept separate from `KanbanStatus` because hallucination state is
+/// orthogonal to the lifecycle — a card can be `ready` *and* `pending`,
+/// for example.
+public enum KanbanHallucinationGate: String, Sendable, CaseIterable {
+    case pending
+    case verified
+    case rejected
+
+    /// Map a raw `hallucination_gate_status` string (case-insensitive) to
+    /// a typed gate. Returns nil for empty/nil/unknown values so callers
+    /// can short-circuit "no gate" branches with `if let gate = …`.
+    public static func from(_ raw: String?) -> KanbanHallucinationGate? {
+        guard let raw, !raw.isEmpty else { return nil }
+        return KanbanHallucinationGate(rawValue: raw.lowercased())
+    }
+}

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

@@ -12,17 +12,27 @@ public struct HermesKanbanTaskDetail: Sendable, Equatable, Codable {
     /// to the worker as upstream context; surfacing them in the
     /// inspector is useful for understanding why a task started.
     public let parentResults: [String: String]
+    /// Envelope-level diagnostics array (sibling to `task`, not nested
+    /// inside it). Defensive — Hermes v0.13's wire shape may attach
+    /// diagnostics to the task itself OR to the envelope.
+    /// `allDiagnostics` dedupes both sources by `(kind, detected_at)`.
+    // TODO(WS-3-Q2): Confirm against live `hermes kanban show --json`
+    // whether diagnostics live on the task envelope, the inner task, or
+    // both. Current decode is tolerant of either.
+    public let envelopeDiagnostics: [HermesKanbanDiagnostic]?
 
     public init(
         task: HermesKanbanTask,
         comments: [HermesKanbanComment] = [],
         events: [HermesKanbanEvent] = [],
-        parentResults: [String: String] = [:]
+        parentResults: [String: String] = [:],
+        envelopeDiagnostics: [HermesKanbanDiagnostic]? = nil
     ) {
         self.task = task
         self.comments = comments
         self.events = events
         self.parentResults = parentResults
+        self.envelopeDiagnostics = envelopeDiagnostics
     }
 
     enum CodingKeys: String, CodingKey {
@@ -30,6 +40,7 @@ public struct HermesKanbanTaskDetail: Sendable, Equatable, Codable {
         case comments
         case events
         case parentResults = "parent_results"
+        case envelopeDiagnostics = "diagnostics"
     }
 
     public init(from decoder: any Decoder) throws {
@@ -48,6 +59,9 @@ public struct HermesKanbanTaskDetail: Sendable, Equatable, Codable {
         self.comments = (try? container.decodeIfPresent([HermesKanbanComment].self, forKey: .comments)) ?? []
         self.events = (try? container.decodeIfPresent([HermesKanbanEvent].self, forKey: .events)) ?? []
         self.parentResults = (try? container.decodeIfPresent([String: String].self, forKey: .parentResults)) ?? [:]
+        // Same `try?` shield as the rest — a malformed envelope
+        // diagnostics array shouldn't reject the whole show response.
+        self.envelopeDiagnostics = try? container.decodeIfPresent([HermesKanbanDiagnostic].self, forKey: .envelopeDiagnostics)
     }
 
     public func encode(to encoder: any Encoder) throws {
@@ -56,5 +70,20 @@ public struct HermesKanbanTaskDetail: Sendable, Equatable, Codable {
         try c.encode(comments, forKey: .comments)
         try c.encode(events, forKey: .events)
         try c.encode(parentResults, forKey: .parentResults)
+        try c.encodeIfPresent(envelopeDiagnostics, forKey: .envelopeDiagnostics)
+    }
+
+    /// Unified diagnostics view for the inspector. Combines `task.diagnostics`
+    /// with envelope-level diagnostics (when present) and dedupes on the
+    /// `(kind, detectedAt)` tuple. Wire-side dupes are unlikely but cheap to
+    /// filter. Empty for pre-v0.13 hosts.
+    public var allDiagnostics: [HermesKanbanDiagnostic] {
+        let onTask = task.diagnostics
+        let onEnvelope = envelopeDiagnostics ?? []
+        var seen = Set<String>()
+        return (onTask + onEnvelope).filter { diag in
+            let key = "\(diag.kind)|\(diag.detectedAt ?? "")"
+            return seen.insert(key).inserted
+        }
     }
 }

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

@@ -17,6 +17,15 @@ public struct KanbanCreateRequest: Sendable, Equatable {
     public var maxRuntimeSeconds: Int?
     public var createdBy: String?
     public var skills: [String]
+    /// v0.13: per-task retry budget. `--max-retries N` is write-once at
+    /// create time — no `set_max_retries` verb. Pass `nil` to let Hermes
+    /// pick its built-in default (3 as of v0.13.0). Capability-gated in
+    /// the create sheet on `hasKanbanDiagnostics`.
+    // TODO(WS-3-Q6): Confirm Hermes's global default for `max_retries`
+    // (v0.13 release notes don't enumerate it). The create sheet defaults
+    // the field to 3; if Hermes config exposes a different default, mirror
+    // it.
+    public var maxRetries: Int?
 
     public init(
         title: String,
@@ -30,7 +39,8 @@ public struct KanbanCreateRequest: Sendable, Equatable {
         idempotencyKey: String? = nil,
         maxRuntimeSeconds: Int? = nil,
         createdBy: String? = nil,
-        skills: [String] = []
+        skills: [String] = [],
+        maxRetries: Int? = nil
     ) {
         self.title = title
         self.body = body
@@ -44,6 +54,7 @@ public struct KanbanCreateRequest: Sendable, Equatable {
         self.maxRuntimeSeconds = maxRuntimeSeconds
         self.createdBy = createdBy
         self.skills = skills
+        self.maxRetries = maxRetries
     }
 
     /// Build the argv suffix this request maps to (everything after
@@ -78,6 +89,9 @@ public struct KanbanCreateRequest: Sendable, Equatable {
         if let maxRuntimeSeconds {
             args.append(contentsOf: ["--max-runtime", "\(maxRuntimeSeconds)s"])
         }
+        if let maxRetries {
+            args.append(contentsOf: ["--max-retries", String(maxRetries)])
+        }
         if let createdBy, !createdBy.isEmpty {
             args.append(contentsOf: ["--created-by", createdBy])
         }

scarf/Packages/ScarfCore/Sources/ScarfCore/Services/KanbanService.swift

@@ -321,6 +321,61 @@ public actor KanbanService {
         try ensureSuccess(code: code, stdout: "", stderr: stderr, verb: "unlink")
     }
 
+    // MARK: - Hallucination gate (v0.13)
+
+    /// Mark a worker-created card as user-verified — flips
+    /// `hallucination_gate_status` from `pending` to `verified` so the
+    /// dispatcher can pick it up. The polling loop picks up the new
+    /// state on the next tick (and the VM optimistically clears the
+    /// pending banner immediately on the click).
+    ///
+    /// **Pre-v0.13 hosts:** the verb doesn't exist; callers MUST gate
+    /// on `HermesCapabilities.hasKanbanDiagnostics` before invoking this.
+    /// A pre-v0.13 binary will surface the failure as
+    /// `KanbanError.nonZeroExit` with stderr containing "unknown command".
+    // TODO(WS-3-Q1): Confirm the exact CLI verb name for the
+    // hallucination-gate verify path against a v0.13 binary (`hermes
+    // kanban --help`). The v0.13 release notes describe "hallucination
+    // gate + recovery UX" but don't enumerate the verb name. This
+    // implementation assumes `hermes kanban verify <id>`. If Hermes ships
+    // it as `hermes kanban gate verify <id>`, `hermes kanban hallucination
+    // verify <id>`, or another name, update the args here. The Reject
+    // path does NOT depend on this verb (it routes through
+    // `archive` + a comment), so the recovery UX stays functional even
+    // if Verify is a stub for an early v0.13.x.
+    public func verify(taskId: String) async throws {
+        let args = ["kanban", "verify", taskId]
+        let (code, _, stderr) = await runHermes(args: args, timeout: 15)
+        try ensureSuccess(code: code, stdout: "", stderr: stderr, verb: "verify")
+    }
+
+    /// Reject a worker-created card as a hallucinated reference. There
+    /// is no dedicated `kanban reject` verb in v0.13; the right action
+    /// per the v0.13 release notes is to archive the card (the work
+    /// doesn't exist) with a comment recording the rejection reason for
+    /// the audit trail. Routing this through the existing `comment` +
+    /// `archive` verbs keeps the wire shape stable across versions.
+    ///
+    /// If a future Hermes adds a dedicated `kanban reject` verb, swap
+    /// the body here — the public surface stays "reject" returning Void.
+    public func rejectHallucinated(taskId: String) async throws {
+        // Best-effort comment first so the audit trail records the
+        // rejection. A failure here shouldn't block the archive — log
+        // and continue.
+        do {
+            try await comment(
+                taskId: taskId,
+                text: "Rejected as hallucinated (no underlying work).",
+                author: nil
+            )
+        } catch {
+            #if canImport(os)
+            Self.logger.warning("kanban reject: comment failed, proceeding to archive (\(error.localizedDescription, privacy: .public))")
+            #endif
+        }
+        try await archive(taskIds: [taskId])
+    }
+
     // MARK: - Drag-drop transition mapper
 
     /// Map a board-level column transition to the right Hermes verb call.

scarf/Packages/ScarfCore/Tests/ScarfCoreTests/KanbanModelsTests.swift

@@ -327,4 +327,196 @@ import Foundation
         #expect(stats.glanceString.isEmpty)
         #expect(stats.activeCount == 0)
     }
+
+    // MARK: - v0.13 (Hermes 2026.5.7) tolerant decode
+    //
+    // The contract these tests pin: a v0.13 host's task / run / detail
+    // JSON decodes successfully WITH the new fields populated, AND a
+    // pre-v0.13 (v0.12) host's task / run / detail JSON decodes
+    // successfully WITHOUT the new fields (everything resolves to nil
+    // or empty). Drift from this pair = a regression that bites every
+    // user not yet on Hermes v0.13.
+
+    @Test func decodeV013TaskFields() throws {
+        let json = """
+        {
+          "id": "t_v013",
+          "title": "v0.13 task",
+          "status": "blocked",
+          "max_retries": 5,
+          "auto_blocked_reason": "worker exited without `kanban complete`",
+          "hallucination_gate_status": "pending",
+          "diagnostics": [
+            {"kind": "worker_exit_no_complete", "message": "exit code 0 with no complete call", "detected_at": 1778160614},
+            {"kind": "darwin_zombie_detected", "detected_at": "2026-05-09T12:00:00Z"}
+          ]
+        }
+        """
+        let task = try JSONDecoder().decode(HermesKanbanTask.self, from: Data(json.utf8))
+        #expect(task.maxRetries == 5)
+        #expect(task.autoBlockedReason?.contains("kanban complete") == true)
+        #expect(task.hallucinationGateStatus == "pending")
+        #expect(task.diagnostics.count == 2)
+        #expect(task.diagnostics.first?.kind == "worker_exit_no_complete")
+        #expect(task.diagnostics.last?.detectedAt?.contains("2026") == true)
+    }
+
+    @Test func decodeV012TaskHasNoNewFields() throws {
+        // The most damaging failure mode is a v0.12 user upgrading Scarf
+        // and having the board stop loading because a v0.13-only field
+        // is required. Pin the contract.
+        let json = """
+        {"id": "t_legacy", "title": "v0.12 task", "status": "ready"}
+        """
+        let task = try JSONDecoder().decode(HermesKanbanTask.self, from: Data(json.utf8))
+        #expect(task.maxRetries == nil)
+        #expect(task.autoBlockedReason == nil)
+        #expect(task.hallucinationGateStatus == nil)
+        #expect(task.diagnostics.isEmpty)
+    }
+
+    @Test func decodeMalformedDiagnosticTolerated() throws {
+        // If Hermes emits a malformed diagnostics value, the rest of the
+        // task should still decode. We use try? on the diagnostics decode
+        // so a single bad entry doesn't reject the whole row.
+        let json = """
+        {
+          "id": "t_x",
+          "title": "x",
+          "status": "ready",
+          "diagnostics": "not-an-array"
+        }
+        """
+        let task = try JSONDecoder().decode(HermesKanbanTask.self, from: Data(json.utf8))
+        #expect(task.id == "t_x")
+        // Diagnostics field couldn't decode — treat as empty.
+        #expect(task.diagnostics.isEmpty)
+    }
+
+    @Test func hallucinationGateMirrorMapsKnownValues() {
+        #expect(KanbanHallucinationGate.from("pending") == .pending)
+        #expect(KanbanHallucinationGate.from("verified") == .verified)
+        #expect(KanbanHallucinationGate.from("REJECTED") == .rejected)  // case-insensitive
+        #expect(KanbanHallucinationGate.from(nil) == nil)
+        #expect(KanbanHallucinationGate.from("") == nil)
+        // Unknown wire values fall through to nil so the banner stays
+        // hidden; future Hermes versions can add `quarantined` etc.
+        // without a Scarf release.
+        #expect(KanbanHallucinationGate.from("quarantined") == nil)
+    }
+
+    @Test func diagnosticKindMirrorMapsKnownValues() {
+        #expect(KanbanDiagnosticKind.from("heartbeat_stalled") == .heartbeatStalled)
+        #expect(KanbanDiagnosticKind.from("DARWIN_ZOMBIE_DETECTED") == .darwinZombieDetected)
+        // Unknown kinds fall through to .unknown so views can render
+        // the raw string verbatim.
+        #expect(KanbanDiagnosticKind.from("future_kind_v014") == .unknown)
+    }
+
+    @Test func diagnosticSeverityMapping() {
+        #expect(KanbanDiagnosticKind.retryCapHit.severity == .danger)
+        #expect(KanbanDiagnosticKind.darwinZombieDetected.severity == .danger)
+        #expect(KanbanDiagnosticKind.heartbeatStalled.severity == .warning)
+        #expect(KanbanDiagnosticKind.workerExitNoComplete.severity == .warning)
+        #expect(KanbanDiagnosticKind.unknown.severity == .neutral)
+    }
+
+    @Test func createRequestArgvIncludesMaxRetries() {
+        let req = KanbanCreateRequest(title: "t", maxRetries: 5)
+        let argv = req.argv()
+        #expect(argv.contains("--max-retries"))
+        #expect(argv.contains("5"))
+    }
+
+    @Test func createRequestArgvOmitsMaxRetriesWhenAbsent() {
+        let req = KanbanCreateRequest(title: "t")
+        let argv = req.argv()
+        #expect(!argv.contains("--max-retries"))
+    }
+
+    @Test func decodeRunWithDiagnostics() throws {
+        let json = """
+        {
+          "id": 1,
+          "task_id": "t_x",
+          "status": "failed",
+          "started_at": 1778160000,
+          "ended_at": 1778160300,
+          "outcome": "crashed",
+          "error": "OOM",
+          "diagnostics": [
+            {"kind": "retry_cap_hit", "message": "3/3 retries exhausted"}
+          ],
+          "failure_count": 3
+        }
+        """
+        let run = try JSONDecoder().decode(HermesKanbanRun.self, from: Data(json.utf8))
+        #expect(run.diagnostics.count == 1)
+        #expect(run.diagnostics.first?.kind == "retry_cap_hit")
+        #expect(run.failureCount == 3)
+    }
+
+    @Test func decodeRunWithoutDiagnostics() throws {
+        // v0.12 run row — no diagnostics, no failure_count, must still
+        // decode cleanly.
+        let json = """
+        {"id": 1, "task_id": "t_x", "status": "running", "started_at": 1778160000}
+        """
+        let run = try JSONDecoder().decode(HermesKanbanRun.self, from: Data(json.utf8))
+        #expect(run.diagnostics.isEmpty)
+        #expect(run.failureCount == nil)
+    }
+
+    @Test func taskDetailMergesEnvelopeAndTaskDiagnostics() throws {
+        // Hermes's wire shape may put diagnostics on the task envelope OR
+        // on the inner task. `allDiagnostics` dedupes by (kind, detected_at)
+        // so a server emitting both sides doesn't surface dupes.
+        let json = """
+        {
+          "task": {
+            "id": "t_y",
+            "title": "y",
+            "status": "blocked",
+            "diagnostics": [
+              {"kind": "heartbeat_stalled", "detected_at": "2026-05-09T12:00:00Z"}
+            ]
+          },
+          "comments": [],
+          "events": [],
+          "diagnostics": [
+            {"kind": "heartbeat_stalled", "detected_at": "2026-05-09T12:00:00Z"},
+            {"kind": "retry_cap_hit"}
+          ]
+        }
+        """
+        let detail = try JSONDecoder().decode(HermesKanbanTaskDetail.self, from: Data(json.utf8))
+        let merged = detail.allDiagnostics
+        #expect(merged.count == 2)
+        #expect(merged.contains(where: { $0.kind == "heartbeat_stalled" }))
+        #expect(merged.contains(where: { $0.kind == "retry_cap_hit" }))
+    }
+
+    @Test func taskDetailWithoutEnvelopeDiagnosticsDecodes() throws {
+        // Pre-v0.13 task detail — no envelope diagnostics. Must decode.
+        let json = """
+        {
+          "task": {"id": "t_z", "title": "z", "status": "ready"},
+          "comments": [],
+          "events": []
+        }
+        """
+        let detail = try JSONDecoder().decode(HermesKanbanTaskDetail.self, from: Data(json.utf8))
+        #expect(detail.envelopeDiagnostics == nil)
+        #expect(detail.allDiagnostics.isEmpty)
+    }
+
+    @Test func diagnosticDecodesUnixTimestamp() throws {
+        let json = """
+        {"kind": "spawn_failure", "detected_at": 1778160614}
+        """
+        let diag = try JSONDecoder().decode(HermesKanbanDiagnostic.self, from: Data(json.utf8))
+        #expect(diag.kind == "spawn_failure")
+        // Decoder normalizes Unix int → ISO-8601 string.
+        #expect(diag.detectedAt?.contains("2026") == true)
+    }
 }

scarf/scarf/Features/Kanban/ViewModels/KanbanBoardViewModel.swift

@@ -55,9 +55,22 @@ final class KanbanBoardViewModel {
     var assigneeFilter: String?       // nil = all assignees
     var showArchived: Bool = false
 
-    /// Optimistic moves keyed by task id; cleared when the polled
+    /// Optimistic in-flight overrides keyed by task id; cleared when the
-    /// response includes the same status the optimistic move set.
+    /// polled response confirms the new state.
-    private var optimisticOverrides: [String: String] = [:]
+    /// - Status side: drag-drop column moves.
+    /// - Hallucination-gate side (v0.13): Verify clicks flip `pending` →
+    ///   `verified` locally so the banner disappears immediately.
+    /// The override entry is dropped from the dictionary entirely once
+    /// both sides are nil (no override needed).
+    private struct OptimisticOverride {
+        var status: String?
+        var hallucinationGate: KanbanHallucinationGate?
+
+        var isEmpty: Bool {
+            status == nil && hallucinationGate == nil
+        }
+    }
+    private var optimisticOverrides: [String: OptimisticOverride] = [:]
     /// Tasks dropped into invalid columns produce a transient "denied"
     /// banner. Stored as an explicit error to support the Cmd-Z style
     /// undo we don't ship in v2.7.5 but want to leave room for.
@@ -177,8 +190,10 @@ final class KanbanBoardViewModel {
         // Optimistic mutation — flip the local row's status to a
         // value within the destination column's range. We pick a
         // representative status per column.
-        let optimisticStatus = optimisticStatus(for: destination)
+        let optimisticStatusValue = optimisticStatus(for: destination)
-        optimisticOverrides[taskId] = optimisticStatus
+        var override = optimisticOverrides[taskId] ?? OptimisticOverride()
+        override.status = optimisticStatusValue
+        optimisticOverrides[taskId] = override
 
         let svc = service
         Task {
@@ -190,11 +205,11 @@ final class KanbanBoardViewModel {
                 // without waiting for the 5s tick.
                 await refresh()
             } catch let err as KanbanError {
-                optimisticOverrides.removeValue(forKey: taskId)
+                clearStatusOverride(for: taskId)
                 lastError = err.errorDescription
                 logger.warning("kanban move failed: \(err.errorDescription ?? "", privacy: .public)")
             } catch {
-                optimisticOverrides.removeValue(forKey: taskId)
+                clearStatusOverride(for: taskId)
                 lastError = error.localizedDescription
             }
         }
@@ -269,6 +284,48 @@ final class KanbanBoardViewModel {
         return task
     }
 
+    // MARK: - Hallucination gate (v0.13)
+
+    /// User confirmed the worker-created card is real. Optimistically
+    /// flip the gate to `verified` so the banner disappears immediately;
+    /// the polling loop confirms the new state on the next tick. On
+    /// failure (e.g. the verb name is wrong on this v0.13.x build), the
+    /// override is cleared and the error surfaces in `lastError`.
+    func verifyHallucination(taskId: String) {
+        var override = optimisticOverrides[taskId] ?? OptimisticOverride()
+        override.hallucinationGate = .verified
+        optimisticOverrides[taskId] = override
+        Task {
+            do {
+                try await service.verify(taskId: taskId)
+                await refresh()
+            } catch let err as KanbanError {
+                clearHallucinationOverride(for: taskId)
+                lastError = err.errorDescription
+                logger.warning("kanban verify failed: \(err.errorDescription ?? "", privacy: .public)")
+            } catch {
+                clearHallucinationOverride(for: taskId)
+                lastError = error.localizedDescription
+            }
+        }
+    }
+
+    /// User rejected the worker-created card as a hallucinated reference.
+    /// Routes through `comment` + `archive` per `KanbanService.rejectHallucinated`
+    /// so there's an audit trail for why the card disappeared.
+    func rejectHallucination(taskId: String) {
+        Task {
+            do {
+                try await service.rejectHallucinated(taskId: taskId)
+                await refresh()
+            } catch let err as KanbanError {
+                lastError = err.errorDescription
+            } catch {
+                lastError = error.localizedDescription
+            }
+        }
+    }
+
     // MARK: - Private helpers
 
     private func mergePolledTasks(_ polled: [HermesKanbanTask]) {
@@ -282,25 +339,75 @@ final class KanbanBoardViewModel {
             filtered = polled
         }
         let presentIds = Set(filtered.map(\.id))
-        // Drop optimistic overrides for tasks Hermes confirmed.
+        // Drop optimistic overrides for tasks Hermes confirmed. Two
-        for (id, optimistic) in optimisticOverrides {
+        // independent sides — clear them separately so a Verify click
-            if let row = filtered.first(where: { $0.id == id }) {
+        // still in-flight survives a status-side poll confirmation, and
-                if columnFromStatus(optimistic) == columnFromStatus(row.status) {
+        // vice versa.
+        for (id, override) in optimisticOverrides {
+            guard let row = filtered.first(where: { $0.id == id }) else {
+                if !presentIds.contains(id) {
+                    // Task no longer in the polled set (archived, deleted,
+                    // or filtered out). Drop the override entirely.
                     optimisticOverrides.removeValue(forKey: id)
                 }
-            } else if !presentIds.contains(id) {
+                continue
-                // Task no longer in the polled set (archived, deleted,
+            }
-                // or filtered out). Drop the optimistic entry.
+            // Status side — optimistic move confirmed.
+            if let optStatus = override.status,
+               columnFromStatus(optStatus) == columnFromStatus(row.status) {
+                optimisticOverrides[id]?.status = nil
+            }
+            // Hallucination-gate side — optimistic verify/reject confirmed.
+            if let optGate = override.hallucinationGate,
+               KanbanHallucinationGate.from(row.hallucinationGateStatus) == optGate {
+                optimisticOverrides[id]?.hallucinationGate = nil
+            }
+            if optimisticOverrides[id]?.isEmpty ?? true {
                 optimisticOverrides.removeValue(forKey: id)
             }
         }
         tasks = filtered
     }
 
+    /// Drop the status side of a task's override (preserving any
+    /// in-flight hallucination-gate optimistic state).
+    private func clearStatusOverride(for taskId: String) {
+        guard var override = optimisticOverrides[taskId] else { return }
+        override.status = nil
+        if override.isEmpty {
+            optimisticOverrides.removeValue(forKey: taskId)
+        } else {
+            optimisticOverrides[taskId] = override
+        }
+    }
+
+    /// Drop the hallucination-gate side of a task's override (preserving
+    /// any in-flight status-side drag-drop).
+    private func clearHallucinationOverride(for taskId: String) {
+        guard var override = optimisticOverrides[taskId] else { return }
+        override.hallucinationGate = nil
+        if override.isEmpty {
+            optimisticOverrides.removeValue(forKey: taskId)
+        } else {
+            optimisticOverrides[taskId] = override
+        }
+    }
+
+    /// Effective hallucination gate for a task — the optimistic override
+    /// wins if one is in flight; otherwise the polled value. View code
+    /// reads through this so the banner / dim state matches the moment-
+    /// after-click experience.
+    func effectiveHallucinationGate(_ task: HermesKanbanTask) -> KanbanHallucinationGate? {
+        if let override = optimisticOverrides[task.id]?.hallucinationGate {
+            return override
+        }
+        return KanbanHallucinationGate.from(task.hallucinationGateStatus)
+    }
+
     /// Return the effective board column for a task — the optimistic
     /// override wins if one is in flight; otherwise the polled status.
     private func effectiveColumn(_ task: HermesKanbanTask) -> KanbanBoardColumn {
-        if let overrideStatus = optimisticOverrides[task.id] {
+        if let overrideStatus = optimisticOverrides[task.id]?.status {
             return columnFromStatus(overrideStatus)
         }
         return columnFromStatus(task.status)

scarf/scarf/Features/Kanban/Views/KanbanBoardView.swift

@@ -13,6 +13,7 @@ import ScarfDesign
 ///   tenant.
 struct KanbanBoardView: View {
     @State private var viewModel: KanbanBoardViewModel
+    @Environment(\.hermesCapabilities) private var capabilitiesStore
 
     /// When non-nil, a project board hosts this view. Drives header
     /// chrome (subtitle, hidden tenant filter) and create-sheet
@@ -33,6 +34,15 @@ struct KanbanBoardView: View {
         self.projectName = projectName
     }
 
+    /// Convenience read for the v0.13 diagnostics flag — gates the
+    /// max_retries field, hallucination banner, diagnostics rendering,
+    /// and the auto-blocked reason banner. Pre-v0.13 hosts get the
+    /// v2.7.5 surface unchanged. Treats a missing store as "off" so
+    /// harness contexts (Previews) don't accidentally surface gated UI.
+    private var supportsKanbanDiagnostics: Bool {
+        capabilitiesStore?.capabilities.hasKanbanDiagnostics ?? false
+    }
+
     @State private var inspectorTaskId: String?
     @State private var showingCreateSheet = false
     @State private var blockSheetTaskId: String?
@@ -71,7 +81,8 @@ struct KanbanBoardView: View {
             KanbanCreateSheet(
                 assignees: viewModel.assignees,
                 tenantPrefill: viewModel.tenantFilter,
-                projectWorkspacePath: viewModel.projectPath
+                projectWorkspacePath: viewModel.projectPath,
+                supportsKanbanDiagnostics: supportsKanbanDiagnostics
             ) { request in
                 _ = try await viewModel.createTask(request)
             }
@@ -188,7 +199,9 @@ struct KanbanBoardView: View {
                         onDrop: { ref in
                             handleDrop(ref.id, on: column)
                         },
-                        canCreate: column == .upNext || column == .triage
+                        canCreate: column == .upNext || column == .triage,
+                        supportsKanbanDiagnostics: supportsKanbanDiagnostics,
+                        effectiveHallucinationGate: { viewModel.effectiveHallucinationGate($0) }
                     )
                 }
                 Spacer(minLength: ScarfSpace.s4)
@@ -208,6 +221,8 @@ struct KanbanBoardView: View {
                 service: viewModel.service,
                 taskId: taskId,
                 availableAssignees: viewModel.assignees,
+                supportsKanbanDiagnostics: supportsKanbanDiagnostics,
+                effectiveHallucinationGate: { viewModel.effectiveHallucinationGate($0) },
                 onClose: { inspectorTaskId = nil },
                 onClaim: {
                     viewModel.attemptMove(taskId: taskId, to: .running)
@@ -232,6 +247,15 @@ struct KanbanBoardView: View {
                 },
                 onReassign: { profile in
                     viewModel.reassignTask(taskId: taskId, to: profile)
+                },
+                onVerifyHallucination: {
+                    viewModel.verifyHallucination(taskId: taskId)
+                },
+                onRejectHallucination: {
+                    viewModel.rejectHallucination(taskId: taskId)
+                    // Card vanishes from active board after archive — close
+                    // the inspector so it doesn't dangle on a deleted task.
+                    inspectorTaskId = nil
                 }
             )
         }

scarf/scarf/Features/Kanban/Views/KanbanCardView.swift

@@ -24,12 +24,40 @@ struct KanbanTaskRef: Transferable {
 /// - **Running** gets a blue left-edge accent + live shimmer
 /// - **Blocked** gets a warning left-edge accent + ⚠ glyph
 /// - **Done** dims to 0.7 opacity (0.55 in dark mode)
+/// - **Hallucination-gate pending** (v0.13+) dims to 0.6 + ⚠ glyph and
+///   shows a one-line auto-blocked reason in the footer when present.
 struct KanbanCardView: View {
     let task: HermesKanbanTask
     let onTap: () -> Void
+    /// True when the connected Hermes is on v0.13+ — gates the
+    /// hallucination dim/glyph, auto-block sub-line, and diagnostics
+    /// dot on the card. Pre-v0.13 hosts see the v2.7.5 chrome unchanged.
+    let supportsKanbanDiagnostics: Bool
+    /// Optimistic-aware accessor. Pre-v0.13 always nil. Otherwise delegates
+    /// to the board VM so a Verify click un-dims the card immediately.
+    let effectiveHallucinationGate: (HermesKanbanTask) -> KanbanHallucinationGate?
+
+    init(
+        task: HermesKanbanTask,
+        supportsKanbanDiagnostics: Bool = false,
+        effectiveHallucinationGate: @escaping (HermesKanbanTask) -> KanbanHallucinationGate? = { _ in nil },
+        onTap: @escaping () -> Void
+    ) {
+        self.task = task
+        self.supportsKanbanDiagnostics = supportsKanbanDiagnostics
+        self.effectiveHallucinationGate = effectiveHallucinationGate
+        self.onTap = onTap
+    }
 
     @Environment(\.colorScheme) private var colorScheme
 
+    /// Cached gate read — derived once per body eval rather than recomputed
+    /// in each subview helper.
+    private var hallucinationGate: KanbanHallucinationGate? {
+        guard supportsKanbanDiagnostics else { return nil }
+        return effectiveHallucinationGate(task)
+    }
+
     var body: some View {
         Button(action: onTap) {
             VStack(alignment: .leading, spacing: ScarfSpace.s2) {
@@ -66,13 +94,22 @@ struct KanbanCardView: View {
         }
         .buttonStyle(.plain)
         .scarfShadow(.sm)
-        .opacity(task.isDone ? doneOpacity : 1.0)
+        // v0.13: hallucination-pending cards dim to 0.6 to signal "needs
+        // verification before running" without making them unreadable.
+        // Done cards stay at the established doneOpacity (0.7 / 0.55).
+        .opacity(cardOpacity)
         .draggable(KanbanTaskRef(id: task.id)) {
             // Drag preview — the live card with a heavier shadow.
             self.dragPreview
         }
     }
 
+    private var cardOpacity: Double {
+        if task.isDone { return doneOpacity }
+        if hallucinationGate == .pending { return 0.6 }
+        return 1.0
+    }
+
     private var titleRow: some View {
         HStack(alignment: .top, spacing: ScarfSpace.s2) {
             statusGlyph
@@ -82,7 +119,15 @@ struct KanbanCardView: View {
                 .lineLimit(2)
                 .multilineTextAlignment(.leading)
             Spacer(minLength: 0)
-            if needsAssignmentWarning {
+            // v0.13 hallucination glyph takes precedence over the
+            // unassigned glyph — the hallucination state is the more
+            // specific signal (a worker created this card; verify it).
+            if hallucinationGate == .pending {
+                Image(systemName: "questionmark.diamond.fill")
+                    .foregroundStyle(ScarfColor.warning)
+                    .font(.system(size: 11, weight: .semibold))
+                    .help("Worker-created — verify before running")
+            } else if needsAssignmentWarning {
                 Image(systemName: "exclamationmark.triangle.fill")
                     .foregroundStyle(ScarfColor.warning)
                     .font(.system(size: 11, weight: .semibold))
@@ -186,16 +231,40 @@ struct KanbanCardView: View {
     }
 
     private var footerRow: some View {
+        VStack(alignment: .leading, spacing: 2) {
+            // v0.13: server-supplied auto-blocked reason. Renders verbatim
+            // (truncated to one line; full reason in the inspector).
+            // Pre-v0.13 hosts always have task.autoBlockedReason == nil.
+            if supportsKanbanDiagnostics,
+               KanbanStatus.from(task.status) == .blocked,
+               let reason = task.autoBlockedReason, !reason.isEmpty {
+                Text(reason)
+                    .scarfStyle(.caption)
+                    .foregroundStyle(ScarfColor.danger)
+                    .lineLimit(1)
+                    .truncationMode(.tail)
+                    .help(reason)
+            }
             HStack(spacing: ScarfSpace.s2) {
                 Text(relativeTimeLabel)
                     .scarfStyle(.caption)
                     .foregroundStyle(ScarfColor.foregroundFaint)
                 Spacer(minLength: 0)
+                // v0.13: diagnostics dot — small stethoscope glyph when
+                // any cross-run distress signal is attached. Matches the
+                // chip count in the inspector.
+                if supportsKanbanDiagnostics, !task.diagnostics.isEmpty {
+                    Image(systemName: "stethoscope")
+                        .font(.system(size: 9))
+                        .foregroundStyle(ScarfColor.warning)
+                        .help("\(task.diagnostics.count) diagnostic signal\(task.diagnostics.count == 1 ? "" : "s")")
+                }
                 if let priority = task.priority, priority >= 70 {
                     priorityIndicator(priority)
                 }
             }
         }
+    }
 
     private func priorityIndicator(_ priority: Int) -> some View {
         let color: Color = priority >= 90 ? ScarfColor.danger : ScarfColor.warning

scarf/scarf/Features/Kanban/Views/KanbanColumnView.swift

@@ -17,6 +17,38 @@ struct KanbanColumnView: View {
     let onCreate: () -> Void
     let onDrop: (KanbanTaskRef) -> Void
     let canCreate: Bool
+    /// True when the connected Hermes is on v0.13+. Forwarded to each
+    /// `KanbanCardView` so the hallucination dim/glyph + diagnostics dot
+    /// + auto-block sub-line gate uniformly.
+    let supportsKanbanDiagnostics: Bool
+    /// Optimistic-aware accessor forwarded to cards. Default is
+    /// "no override" so Previews and harness contexts still render
+    /// without wiring up a board VM.
+    let effectiveHallucinationGate: (HermesKanbanTask) -> KanbanHallucinationGate?
+
+    init(
+        column: KanbanBoardColumn,
+        tasks: [HermesKanbanTask],
+        isLive: Bool,
+        readyPillCount: Int,
+        onTaskTap: @escaping (HermesKanbanTask) -> Void,
+        onCreate: @escaping () -> Void,
+        onDrop: @escaping (KanbanTaskRef) -> Void,
+        canCreate: Bool,
+        supportsKanbanDiagnostics: Bool = false,
+        effectiveHallucinationGate: @escaping (HermesKanbanTask) -> KanbanHallucinationGate? = { _ in nil }
+    ) {
+        self.column = column
+        self.tasks = tasks
+        self.isLive = isLive
+        self.readyPillCount = readyPillCount
+        self.onTaskTap = onTaskTap
+        self.onCreate = onCreate
+        self.onDrop = onDrop
+        self.canCreate = canCreate
+        self.supportsKanbanDiagnostics = supportsKanbanDiagnostics
+        self.effectiveHallucinationGate = effectiveHallucinationGate
+    }
 
     @State private var isTargeted = false
 
@@ -36,7 +68,11 @@ struct KanbanColumnView: View {
                             .padding(.top, ScarfSpace.s4)
                     } else {
                         ForEach(tasks) { task in
-                            KanbanCardView(task: task) {
+                            KanbanCardView(
+                                task: task,
+                                supportsKanbanDiagnostics: supportsKanbanDiagnostics,
+                                effectiveHallucinationGate: effectiveHallucinationGate
+                            ) {
                                 onTaskTap(task)
                             }
                         }

scarf/scarf/Features/Kanban/Views/KanbanCreateSheet.swift

@@ -14,6 +14,12 @@ struct KanbanCreateSheet: View {
     /// Pre-filled project workspace path on per-project boards. When
     /// non-nil, the workspace picker is locked to "Project Dir".
     let projectWorkspacePath: String?
+    /// True when the connected Hermes is on v0.13+ — gates the
+    /// `--max-retries` field and decides whether to strip newlines from
+    /// the title at submit time. Pre-v0.13 hosts may truncate at the
+    /// first `\n`; we keep the multi-line input rendering on either way
+    /// since a taller `TextField` is harmless on v0.12.
+    let supportsKanbanDiagnostics: Bool
     /// Closure invoked when the user submits — VM owner constructs the
     /// `KanbanService.create` call.
     let onSubmit: (KanbanCreateRequest) async throws -> Void
@@ -33,6 +39,11 @@ struct KanbanCreateSheet: View {
     @State private var skillsInput: String = ""
     @State private var tenant: String = ""
     @State private var sendToTriage: Bool = false
+    /// v0.13: per-task retry budget. Toggle-gated so the user can opt
+    /// into "send the flag" vs. "let Hermes pick its default" (the
+    /// release notes default to 3 — see TODO in KanbanCreateRequest).
+    @State private var maxRetriesEnabled: Bool = false
+    @State private var maxRetries: Int = 3
     @State private var isSubmitting: Bool = false
     @State private var submitError: String?
     @FocusState private var titleFocused: Bool
@@ -62,6 +73,9 @@ struct KanbanCreateSheet: View {
                     assigneePicker
                     workspaceField
                     priorityField
+                    if supportsKanbanDiagnostics {
+                        maxRetriesField
+                    }
                     skillsField
                     if projectWorkspacePath == nil {
                         tenantField
@@ -114,13 +128,63 @@ struct KanbanCreateSheet: View {
     // MARK: - Fields
 
     private var titleField: some View {
+        // v0.13 server tolerates multi-line titles. We keep the
+        // multi-line input rendering on for ALL versions of Hermes —
+        // visually a taller TextField is harmless on v0.12 — and decide
+        // at submit time whether to strip newlines (see `makeRequest`).
         VStack(alignment: .leading, spacing: 4) {
             ScarfSectionHeader("Title")
-            ScarfTextField("What needs doing?", text: $title)
+            TextField(
+                "What needs doing?",
+                text: $title,
+                axis: .vertical
+            )
+            .lineLimit(1...4)
+            .textFieldStyle(.plain)
+            .scarfStyle(.body)
+            .padding(.horizontal, ScarfSpace.s3)
+            .padding(.vertical, ScarfSpace.s2)
+            .background(
+                RoundedRectangle(cornerRadius: ScarfRadius.md, style: .continuous)
+                    .fill(ScarfColor.backgroundSecondary)
+            )
+            .overlay(
+                RoundedRectangle(cornerRadius: ScarfRadius.md, style: .continuous)
+                    .strokeBorder(ScarfColor.borderStrong, lineWidth: 1)
+            )
             .focused($titleFocused)
         }
     }
 
+    /// v0.13: per-task retry budget. Toggle gates whether `--max-retries`
+    /// is sent at all so the user can preserve "let Hermes pick the
+    /// default" semantics by leaving the toggle off.
+    private var maxRetriesField: some View {
+        VStack(alignment: .leading, spacing: 4) {
+            ScarfSectionHeader(
+                "Max retries",
+                subtitle: "0 = no retries. Defaults to 3."
+            )
+            HStack(spacing: ScarfSpace.s3) {
+                Toggle("Override default", isOn: $maxRetriesEnabled)
+                    .toggleStyle(.switch)
+                    .labelsHidden()
+                Stepper(value: $maxRetries, in: 0...20) {
+                    Text("\(maxRetries)")
+                        .scarfStyle(.bodyEmph)
+                        .frame(minWidth: 24, alignment: .trailing)
+                        .foregroundStyle(
+                            maxRetriesEnabled
+                                ? ScarfColor.foregroundPrimary
+                                : ScarfColor.foregroundFaint
+                        )
+                }
+                .disabled(!maxRetriesEnabled)
+                Spacer()
+            }
+        }
+    }
+
     private var descriptionField: some View {
         VStack(alignment: .leading, spacing: 4) {
             ScarfSectionHeader("Description", subtitle: "Markdown supported")
@@ -307,7 +371,14 @@ struct KanbanCreateSheet: View {
     }
 
     private func makeRequest() -> KanbanCreateRequest {
-        let trimmedTitle = title.trimmingCharacters(in: .whitespacesAndNewlines)
+        var trimmedTitle = title.trimmingCharacters(in: .whitespacesAndNewlines)
+        // Pre-v0.13 hosts may truncate titles at the first `\n`. Strip
+        // newlines client-side when we know the connected Hermes hasn't
+        // shipped multi-line title support — replace with a space to
+        // keep the user's intent visible. v0.13+ keeps newlines verbatim.
+        if !supportsKanbanDiagnostics {
+            trimmedTitle = trimmedTitle.replacingOccurrences(of: "\n", with: " ")
+        }
         let trimmedBody = bodyText.trimmingCharacters(in: .whitespacesAndNewlines)
         let trimmedAssignee = assignee.trimmingCharacters(in: .whitespacesAndNewlines)
         let trimmedTenant = tenant.trimmingCharacters(in: .whitespacesAndNewlines)
@@ -330,6 +401,14 @@ struct KanbanCreateSheet: View {
             }
         }
 
+        // Belt-and-suspenders: the `maxRetriesField` is only rendered
+        // when `supportsKanbanDiagnostics` is true, but gate again here
+        // so a programmatic state change can't smuggle the flag onto a
+        // pre-v0.13 host (where the verb would error).
+        let resolvedMaxRetries: Int? = (supportsKanbanDiagnostics && maxRetriesEnabled)
+            ? maxRetries
+            : nil
+
         return KanbanCreateRequest(
             title: trimmedTitle,
             body: trimmedBody.isEmpty ? nil : trimmedBody,
@@ -342,7 +421,8 @@ struct KanbanCreateSheet: View {
             idempotencyKey: nil,
             maxRuntimeSeconds: nil,
             createdBy: nil,
-            skills: parsedSkills
+            skills: parsedSkills,
+            maxRetries: resolvedMaxRetries
         )
     }
 }

scarf/scarf/Features/Kanban/Views/KanbanInspectorPane.swift

@@ -8,6 +8,16 @@ import ScarfDesign
 struct KanbanInspectorPane: View {
     @State private var viewModel: KanbanTaskDetailViewModel
     let availableAssignees: [HermesKanbanAssignee]
+    /// True when the connected Hermes is on v0.13+ — gates the
+    /// hallucination banner, max_retries chip, diagnostics block,
+    /// and auto-blocked reason banner. Pre-v0.13 hosts see the v2.7.5
+    /// inspector unchanged.
+    let supportsKanbanDiagnostics: Bool
+    /// Resolves an effective hallucination gate — the board VM owns the
+    /// optimistic-override merge so the banner disappears immediately on
+    /// Verify before the polled state confirms the new gate. Falls back
+    /// to the wire-level value when no override is in flight.
+    let effectiveHallucinationGate: (HermesKanbanTask) -> KanbanHallucinationGate?
     let onClose: () -> Void
     let onClaim: () -> Void
     let onComplete: () -> Void
@@ -15,6 +25,8 @@ struct KanbanInspectorPane: View {
     let onUnblock: () -> Void
     let onArchive: () -> Void
     let onReassign: (String?) -> Void
+    let onVerifyHallucination: () -> Void
+    let onRejectHallucination: () -> Void
 
     @State private var selectedTab: DetailTab = .comments
 
@@ -30,16 +42,22 @@ struct KanbanInspectorPane: View {
         service: KanbanService,
         taskId: String,
         availableAssignees: [HermesKanbanAssignee] = [],
+        supportsKanbanDiagnostics: Bool = false,
+        effectiveHallucinationGate: @escaping (HermesKanbanTask) -> KanbanHallucinationGate? = { _ in nil },
         onClose: @escaping () -> Void,
         onClaim: @escaping () -> Void,
         onComplete: @escaping () -> Void,
         onBlock: @escaping () -> Void,
         onUnblock: @escaping () -> Void,
         onArchive: @escaping () -> Void,
-        onReassign: @escaping (String?) -> Void = { _ in }
+        onReassign: @escaping (String?) -> Void = { _ in },
+        onVerifyHallucination: @escaping () -> Void = {},
+        onRejectHallucination: @escaping () -> Void = {}
     ) {
         _viewModel = State(initialValue: KanbanTaskDetailViewModel(service: service, taskId: taskId))
         self.availableAssignees = availableAssignees
+        self.supportsKanbanDiagnostics = supportsKanbanDiagnostics
+        self.effectiveHallucinationGate = effectiveHallucinationGate
         self.onClose = onClose
         self.onClaim = onClaim
         self.onComplete = onComplete
@@ -47,6 +65,8 @@ struct KanbanInspectorPane: View {
         self.onUnblock = onUnblock
         self.onArchive = onArchive
         self.onReassign = onReassign
+        self.onVerifyHallucination = onVerifyHallucination
+        self.onRejectHallucination = onRejectHallucination
     }
 
     var body: some View {
@@ -159,6 +179,16 @@ struct KanbanInspectorPane: View {
                                 ScarfBadge(workspace, kind: .neutral)
                                     .fixedSize()
                             }
+                            // v0.13: max_retries chip. Read-only — Hermes
+                            // has no `update --max-retries` verb. The
+                            // `if let` guards pre-v0.13 hosts (always nil)
+                            // and the explicit capability gate adds
+                            // belt-and-suspenders.
+                            if supportsKanbanDiagnostics, let maxRetries = task.maxRetries {
+                                ScarfBadge("retries: \(maxRetries)", kind: .neutral)
+                                    .fixedSize()
+                                    .help("Max retries set at create time. Hermes has no update verb — re-create the task to change this.")
+                            }
                             if let tenant = task.tenant, !tenant.isEmpty {
                                 ScarfBadge(tenant, kind: .brand)
                                     .fixedSize()
@@ -251,13 +281,18 @@ struct KanbanInspectorPane: View {
     // MARK: - Body
 
     /// Inline health banner shown above the task body when something
-    /// requires user attention. Two conditions trigger today:
+    /// requires user attention. Stack vertically (multiple can apply at
-    /// 1. Task is in `ready`/`todo` with no assignee — explains that
+    /// once on a v0.13 task — e.g. unassigned + hallucination pending +
-    ///    the dispatcher silently skips unassigned tasks.
+    /// last-run-blocked).
-    /// 2. The most recent run ended in a non-success outcome
+    /// Order top-to-bottom:
-    ///    (`stale_lock`/`crashed`/`gave_up`/`timed_out`/`spawn_failed`/
+    /// 1. **Hallucination gate (v0.13+)** — pending worker-created card.
-    ///    `reclaimed`/`failed`) — surfaces the error so the user
+    ///    User must verify or reject before any other action makes sense.
-    ///    doesn't have to dig into the Runs tab to discover it.
+    /// 2. **Auto-blocked reason (v0.13+)** — server-supplied reason
+    ///    overrides the generic "Last run: blocked" banner.
+    /// 3. Task is in `ready`/`todo` with no assignee — explains that the
+    ///    dispatcher silently skips unassigned tasks.
+    /// 4. The most recent run ended in a non-success outcome — surfaces
+    ///    the error so the user doesn't have to dig into the Runs tab.
     @ViewBuilder
     private func healthBanner(for task: HermesKanbanTask) -> some View {
         let status = KanbanStatus.from(task.status)
@@ -292,6 +327,38 @@ struct KanbanInspectorPane: View {
         // Also suppress for `done` (terminal success).
         let suppressFailureBanner = (status == .running) || (status == .done)
 
+        // v0.13: hallucination-gate state. Read through the VM's
+        // optimistic-aware accessor so a Verify click takes effect
+        // before the polled state confirms. Belt-and-suspenders gate
+        // on capability flag.
+        let hallucination: KanbanHallucinationGate? = supportsKanbanDiagnostics
+            ? effectiveHallucinationGate(task)
+            : nil
+        // v0.13: structured auto-blocked reason. Renders the server's
+        // string verbatim; takes precedence over the generic "Last run:
+        // blocked" banner.
+        let autoBlockedReason: String? = (supportsKanbanDiagnostics
+                                          && status == .blocked
+                                          && (task.autoBlockedReason?.isEmpty == false))
+            ? task.autoBlockedReason
+            : nil
+        // Suppress the generic last-run banner when the more specific
+        // server-side reason supersedes it.
+        let suppressGenericFailure = autoBlockedReason != nil
+
+        VStack(alignment: .leading, spacing: ScarfSpace.s2) {
+            if hallucination == .pending {
+                hallucinationBanner
+            }
+            if let reason = autoBlockedReason {
+                bannerRow(
+                    icon: "exclamationmark.octagon.fill",
+                    tint: ScarfColor.danger,
+                    title: "Auto-blocked",
+                    // Verbatim — Hermes-side message is the source of truth.
+                    message: reason
+                )
+            }
             if needsAssignee {
                 bannerRow(
                     icon: "exclamationmark.triangle.fill",
@@ -299,7 +366,9 @@ struct KanbanInspectorPane: View {
                     title: "Won't run automatically",
                     message: "Unassigned tasks are silently skipped by Hermes's dispatcher. Add an assignee to get this scheduled."
                 )
-        } else if hadFailedEndedRun, let lastEndedRun, !suppressFailureBanner {
+            }
+            if hadFailedEndedRun, let lastEndedRun,
+               !suppressFailureBanner, !suppressGenericFailure {
                 let label = (lastEndedRun.outcome ?? lastEndedRun.status).lowercased()
                 let detail = lastEndedRun.error ?? lastEndedRun.summary ?? "no details"
                 bannerRow(
@@ -309,6 +378,84 @@ struct KanbanInspectorPane: View {
                     message: detail
                 )
             }
+            // v0.13: cross-run diagnostics on the task header.
+            if supportsKanbanDiagnostics, !task.diagnostics.isEmpty {
+                diagnosticsBlock(task.diagnostics)
+            }
+        }
+    }
+
+    /// v0.13 hallucination-gate banner — Verify / Reject affordances for
+    /// worker-created cards waiting on user verification.
+    private var hallucinationBanner: some View {
+        HStack(alignment: .top, spacing: ScarfSpace.s2) {
+            Image(systemName: "questionmark.diamond.fill")
+                .foregroundStyle(ScarfColor.warning)
+                .font(.system(size: 13, weight: .semibold))
+            VStack(alignment: .leading, spacing: 4) {
+                Text("Created by a worker — verify before running")
+                    .scarfStyle(.captionStrong)
+                    .foregroundStyle(ScarfColor.foregroundPrimary)
+                Text("A worker claimed it created this card; Hermes hasn't confirmed the underlying work exists. Verify the card matches a real follow-up, or reject if it's a hallucinated reference.")
+                    .scarfStyle(.caption)
+                    .foregroundStyle(ScarfColor.foregroundMuted)
+                HStack(spacing: ScarfSpace.s2) {
+                    Button("Verify", action: onVerifyHallucination)
+                        .buttonStyle(ScarfPrimaryButton())
+                    Button("Reject", action: onRejectHallucination)
+                        .buttonStyle(ScarfDestructiveButton())
+                }
+                .padding(.top, 2)
+            }
+            Spacer(minLength: 0)
+        }
+        .padding(ScarfSpace.s2)
+        .background(
+            RoundedRectangle(cornerRadius: ScarfRadius.md, style: .continuous)
+                .fill(ScarfColor.warning.opacity(0.10))
+        )
+        .overlay(
+            RoundedRectangle(cornerRadius: ScarfRadius.md, style: .continuous)
+                .strokeBorder(ScarfColor.warning.opacity(0.4), lineWidth: 1)
+        )
+    }
+
+    /// v0.13 diagnostics block — renders a list of distress signals.
+    /// Used both at the task-header level (cross-run signals) and per
+    /// run on the Runs tab (in-flight signals). Wraps in a horizontal
+    /// scroll so a long diag list doesn't blow out inspector width.
+    private func diagnosticsBlock(_ diags: [HermesKanbanDiagnostic]) -> some View {
+        VStack(alignment: .leading, spacing: 4) {
+            Text("Diagnostics")
+                .scarfStyle(.captionUppercase)
+                .foregroundStyle(ScarfColor.foregroundFaint)
+            ScrollView(.horizontal, showsIndicators: false) {
+                HStack(spacing: 4) {
+                    ForEach(diags) { diag in
+                        diagnosticBadge(diag)
+                    }
+                }
+            }
+        }
+        .padding(.top, 4)
+    }
+
+    @ViewBuilder
+    private func diagnosticBadge(_ diag: HermesKanbanDiagnostic) -> some View {
+        let kind = KanbanDiagnosticKind.from(diag.kind)
+        let badgeKind: ScarfBadgeKind = {
+            switch kind.severity {
+            case .danger:  return .danger
+            case .warning: return .warning
+            case .neutral: return .neutral
+            }
+        }()
+        // Render the raw kind string — view code stays in sync with
+        // whatever future kinds Hermes ships. The typed mirror picks
+        // the badge tint and tooltip glyph; the verbatim wire string
+        // is the user-facing label.
+        ScarfBadge(diag.kind, kind: badgeKind)
+            .help(diag.message ?? diag.kind)
     }
 
     private func bannerRow(
@@ -562,6 +709,9 @@ struct KanbanInspectorPane: View {
     private func runRow(_ run: HermesKanbanRun) -> some View {
         VStack(alignment: .leading, spacing: 2) {
             HStack(spacing: ScarfSpace.s2) {
+                // Render the wire-side outcome / status string verbatim so
+                // v0.13's richer outcome strings ("zombied — reclaimed by
+                // reaper", etc.) surface unchanged.
                 ScarfBadge(run.outcome ?? run.status, kind: outcomeKind(run.outcome ?? run.status))
                 if let profile = run.profile {
                     Text(profile)
@@ -585,6 +735,12 @@ struct KanbanInspectorPane: View {
                     .foregroundStyle(ScarfColor.danger)
                     .frame(maxWidth: .infinity, alignment: .leading)
             }
+            // v0.13: per-run diagnostics. Gated on capability so a future
+            // server-side change can't accidentally surface partial UX
+            // on a pre-v0.13 host.
+            if supportsKanbanDiagnostics, !run.diagnostics.isEmpty {
+                diagnosticsBlock(run.diagnostics)
+            }
         }
         .padding(ScarfSpace.s2)
         .background(
@@ -619,6 +775,14 @@ struct KanbanInspectorPane: View {
     @ViewBuilder
     private var primaryAction: some View {
         if let task = viewModel.detail?.task {
+            // v0.13: when the hallucination gate is pending, suppress the
+            // primary action — the banner provides Verify / Reject as the
+            // gate. Showing "Start" alongside the banner would let the
+            // user dispatch a card Hermes hasn't confirmed exists.
+            if supportsKanbanDiagnostics,
+               effectiveHallucinationGate(task) == .pending {
+                EmptyView()
+            } else {
                 switch KanbanStatus.from(task.status) {
                 case .ready, .todo:
                     Button("Start", action: onClaim)
@@ -639,6 +803,7 @@ struct KanbanInspectorPane: View {
                 }
             }
         }
+    }
 
     @ViewBuilder
     private var secondaryActions: some View {