CB-185: route members to a separate herdr daemon (#186)

fleetd/fleetd.example.yaml

@@ -114,6 +114,9 @@ bind:
 # (${HERDR_SOCKET_PATH:-~/.config/herdr/herdr.sock}).
 herdrSocket: ~/.config/herdr/herdr.sock
 
+# Optional socket for member panes. Omit this to use herdrSocket for both leads and members.
+# memberHerdrSocket: /Users/member/.config/herdr/herdr.sock
+
 # How member sessions are spawned. Define one or more named profiles (backends) under
 # `profiles`; each key is the profile name (also the ccs profile). A profile says only WHICH
 # BACKEND — model, CLI adapter, credentials, cost. It says nothing about what a member spawned on

fleetd/src/main/java/dev/ltms/fleet/Fleetd.java

@@ -7,6 +7,7 @@ import dev.ltms.fleet.guard.SubscriptionGuard;
 import dev.ltms.fleet.herdr.AgentControl;
 import dev.ltms.fleet.herdr.HerdrClient;
 import dev.ltms.fleet.herdr.HerdrException;
+import dev.ltms.fleet.herdr.HerdrRouter;
 import dev.ltms.fleet.herdr.LeadTabScanner;
 import dev.ltms.fleet.lead.LeadLauncher;
 import dev.ltms.fleet.herdr.PaneLocator;
@@ -149,9 +150,12 @@ public final class Fleetd {
                 : UnixSocketHerdrClient.defaultSocketPath();
 
         UnixSocketHerdrClient herdr = UnixSocketHerdrClient.connect(socket, new com.fasterxml.jackson.databind.ObjectMapper());
-
-        AgentControl agents = new AgentControl(herdr);
-        WorkspaceControl spaces = new WorkspaceControl(herdr);
+        UnixSocketHerdrClient memberHerdr = cfg.memberHerdrSocket() != null && !cfg.memberHerdrSocket().isBlank()
+                ? UnixSocketHerdrClient.connect(Path.of(cfg.memberHerdrSocket()), new com.fasterxml.jackson.databind.ObjectMapper())
+                : herdr;
+        AtomicReference<Supplier<Map<String, String>>> leadsRef = new AtomicReference<>(Map::of);
+        HerdrRouter router = new HerdrRouter(herdr, memberHerdr,
+                target -> leadsRef.get().get().containsKey(target));
         // CB-402: one adapter per configured peer kind, fronted by a composite router. A profile's
         // `kind:` selects its adapter — claude-code (the default) and opencode partition the profile
         // set — and the composite dispatches each SPI call to the adapter that owns the profile/pane.
@@ -169,14 +173,14 @@ public final class Fleetd {
         // bridge configured with no workers, or opencode-only, still has a well-defined base adapter)
         // unless opencode is the only kind configured.
         if (!claudeProfiles.isEmpty() || opencodeProfiles.isEmpty()) {
-            adapters.add(new ClaudeCodeLauncher(agents, spaces, guard,
+            adapters.add(new ClaudeCodeLauncher(router.memberAgents(), router.memberSpaces(), guard,
                     claudeProfiles, cfg.effectiveDefaultProfile(), System::getenv,
                     cfg.spawnReadyTimeoutMs(), cfg.spawnReadyPollMs(),
                     () -> config.get().fleet(),
                     () -> config.get().memberCredentials()));
         }
         if (!opencodeProfiles.isEmpty()) {
-            adapters.add(new OpenCodeLauncher(agents, spaces,
+            adapters.add(new OpenCodeLauncher(router.memberAgents(), router.memberSpaces(),
                     opencodeProfiles, cfg.effectiveDefaultProfile(), System::getenv,
                     cfg.spawnReadyTimeoutMs(), cfg.spawnReadyPollMs(),
                     () -> config.get().fleet(),
@@ -271,6 +275,7 @@ public final class Fleetd {
             // operational cadence, not identity, so there is no correctness reason to give every
             // lead its own scanner.
             int scanIntervalSeconds = leaders.values().iterator().next().scanIntervalSeconds();
+            // This must use the lead daemon: scanning member tabs would demote the lead to a worker.
             leads = new LeadTabScanner(herdr, tabToName, Set.of(),
                     TimeUnit.SECONDS.toNanos(scanIntervalSeconds), System::nanoTime);
             log.info("lead scan: tabs {} host a lead (rescan every {}s, shared fleet space)",
@@ -278,13 +283,14 @@ public final class Fleetd {
         } else {
             leads = () -> leadTerminals;
         }
+        leadsRef.set(leads);
 
         // CB-558: start any declared lead that is not already running. After the scanner is built,
         // because both read the same tab labels and the ordering makes that dependency visible; and
         // only when herdr answered, because the launcher's whole safety property is that it can
         // count live leads first — it must never guess and risk a second orchestrator.
         if (herdrUp && !leaders.isEmpty()) {
-            int launched = new LeadLauncher(agents, spaces, cfg).ensureLeads();
+            int launched = new LeadLauncher(router.leadAgents(), router.leadSpaces(), cfg).ensureLeads();
             if (launched > 0) {
                 log.info("lead auto-launch: {} lead(s) started", launched);
             }
@@ -340,6 +346,7 @@ public final class Fleetd {
                                     + "BACKEND_EXHAUSTED): {}", credentialId,
                             cfg.quarantineCooldownSeconds(), profile.profile(), reason);
                 });
+        AgentControl agents = router.memberAgents();
         CompletionResolver completion = new CompletionResolver(agents, rendezvous, exhaustedPatterns, exhaustionSink);
         // CB-113: deliver only to an available worker (its MCP is connected), never its boot window.
         // CB-301: the manager's presence bridge records availability and drives SPAWNING → READY.
@@ -381,9 +388,9 @@ public final class Fleetd {
             }
         };
         Predicate<String> deliverable = deliverableTo(presence, leads);
-        Injector injector = new Injector(agents, turnListener, deliverable,
+        Injector injector = new Injector(router, turnListener, deliverable,
                 presence::forget);
-        StatusPoller poller = new StatusPoller(agents, injector, Injector.POLL_INTERVAL_MILLIS);
+        StatusPoller poller = new StatusPoller(router, injector, Injector.POLL_INTERVAL_MILLIS);
         poller.start();
 
         // CB-307: reply inbox. A broker: block selects the AMQP-backed durable adapter; absent (or
@@ -420,7 +427,7 @@ public final class Fleetd {
         // are counted at their single funnel rather than at each of the two caller-facing surfaces.
         // CB-512: the push loop takes it too, so nudge outcomes (delivered|exhausted) are counted.
         Metrics metrics = FleetMetrics.create(sessions, replyInbox);
-        var pushLoop = new ReplyPushLoop(primaryRegistry, agents, replyInbox,
+        var pushLoop = new ReplyPushLoop(primaryRegistry, router.leadAgents(), replyInbox,
                 pushScheduler, maxReminders, backoffMs, metrics);
         // CB-551: idle-lead heartbeat. Opt-in; absent `leadHeartbeat:` this is never constructed, so
         // an upgraded daemon cannot silently start spending subscription on nudging an idle lead.
@@ -430,7 +437,7 @@ public final class Fleetd {
                 Thread.ofVirtual().name("bridge-heartbeat-").unstarted(r));
         if (cfg.leadHeartbeat() != null) {
             var hb = cfg.leadHeartbeat();
-            heartbeat = new LeadHeartbeatLoop(primaryRegistry, agents, replyInbox, sessions::roster,
+            heartbeat = new LeadHeartbeatLoop(primaryRegistry, router.leadAgents(), replyInbox, sessions::roster,
                     pushLoop, heartbeatScheduler, System::nanoTime,
                     TimeUnit.SECONDS.toNanos(hb.idleAfterSeconds()), hb.backoffMs(), hb.quietNudgeCap(),
                     metrics);
@@ -439,7 +446,7 @@ public final class Fleetd {
             heartbeat = null;
             heartbeatScheduler.shutdownNow();
         }
-        MessageService messages = new MessageService(agents, injector, rendezvous, replyInbox,
+        MessageService messages = new MessageService(router, injector, rendezvous, replyInbox,
                 pushLoop, metrics);
 
         // Health is a slow whole-fleet observer. Keep it separate from the 250ms delivery poller.
@@ -491,8 +498,11 @@ public final class Fleetd {
 
         // MCP server face (CB-105): fleet_send/fleet_reply/fleet_status, mounted at /mcp.
         // Caller identity is resolved from the connection (peer PID → herdr pane), not arguments.
+        // CB-185: a caller's pane can live on either daemon (a lead's on the lead daemon, a
+        // member's on the member daemon) — search both, lead first. Collapses to one scan when
+        // memberHerdrSocket is unset (herdr == memberHerdr).
         ConnectionIdentity identity = new ConnectionIdentity(
-                new PaneLocator(herdr), new LsofPeerPidLookup(), new LsofProcessCwdLookup());
+                new PaneLocator(herdr, memberHerdr), new LsofPeerPidLookup(), new LsofProcessCwdLookup());
 
         // CB-501: one resolver behind both entry paths. Worker identity still comes from the
         // connection and is never token-gated, so enabling token mode cannot lock the fleet out.
@@ -538,7 +548,7 @@ public final class Fleetd {
         if (leadMailbox != null) {
             var leadCoordScheduler = Executors.newSingleThreadScheduledExecutor(r ->
                     Thread.ofVirtual().name("bridge-leadcoord-").unstarted(r));
-            leadCoordLoop = new LeadCoordLoop(leadMailbox, agents, leads, leadCoordScheduler,
+            leadCoordLoop = new LeadCoordLoop(leadMailbox, router.leadAgents(), leads, leadCoordScheduler,
                     LEAD_COORD_INTERVAL_MS);
             leadCoordLoop.start();
             leadCoordSchedulerRef = leadCoordScheduler;
@@ -589,10 +599,12 @@ public final class Fleetd {
                     log.debug("lead mailbox close: {}", e.toString());
                 }
             }
-            herdr.close();
+            router.close();
         }));
 
-        Javalin app = new FleetApp(herdr, workers, sessions, messages, presence, mcp.servlet(),
+        // CB-185: give FleetApp both daemons — /healthz must require both to answer and
+        // GET /sessions must merge across both, or a down/unpolled member daemon is invisible.
+        Javalin app = new FleetApp(herdr, memberHerdr, workers, sessions, messages, presence, mcp.servlet(),
                 callers, metrics, deliverable).build();
         app.start(cfg.bind().host(), cfg.bind().port());
         log.info("fleetd listening on {}:{}, herdr socket {}",

fleetd/src/main/java/dev/ltms/fleet/config/ConfigRef.java

@@ -71,7 +71,7 @@ public final class ConfigRef implements Supplier<FleetConfig> {
 
     /** Keys that cannot change under a running daemon — see the class doc. */
     private static final Set<String> COLD_KEYS =
-            Set.of("bind", "herdrSocket", "broker", "auth");
+             Set.of("bind", "herdrSocket", "memberHerdrSocket", "broker", "auth");
 
     private final Path path;
     private final AtomicReference<FleetConfig> current;
@@ -190,6 +190,9 @@ public final class ConfigRef implements Supplier<FleetConfig> {
         if (!Objects.equals(old.herdrSocket(), fresh.herdrSocket())) {
             changed.add("herdrSocket");
         }
+        if (!Objects.equals(old.memberHerdrSocket(), fresh.memberHerdrSocket())) {
+            changed.add("memberHerdrSocket");
+        }
         if (!Objects.equals(old.broker(), fresh.broker())) {
             changed.add("broker");
         }

fleetd/src/main/java/dev/ltms/fleet/config/FleetConfig.java

@@ -32,7 +32,8 @@ import java.util.Set;
  * silently dropping a whole block is indistinguishable from honouring it.
  *
  * @param bind          REST/MCP listen host:port
- * @param herdrSocket   path to herdr's Unix socket ({@code null} → client default)
+ * @param herdrSocket   path to the lead herdr Unix socket ({@code null} → client default)
+ * @param memberHerdrSocket optional member herdr Unix socket ({@code null}/blank → lead socket)
  * @param profiles      named backend profiles, keyed by profile name (multi-backend fleet). A
  *                      profile answers <em>which backend</em> — model, CLI adapter, credentials,
  *                      cost. It says nothing about what the member spawned on it is for; that is
@@ -80,6 +81,7 @@ import java.util.Set;
 public record FleetConfig(
         Bind bind,
         String herdrSocket,
+        String memberHerdrSocket,
         Map<String, Profile> profiles,
         Guard guard,
         String worktreeRoot,
@@ -105,7 +107,7 @@ public record FleetConfig(
                          LeadHeartbeat leadHeartbeat, Health health, String placement, Auth auth,
                          ConfigReload configReload, Integer quarantineCooldownSeconds,
                          MemberCredentials memberCredentials) {
-        this(bind, herdrSocket, profiles, guard, worktreeRoot, lifecycle, spawnReadyTimeoutMs,
+        this(bind, herdrSocket, null, profiles, guard, worktreeRoot, lifecycle, spawnReadyTimeoutMs,
                 spawnReadyPollMs, broker, primary, fleet, leadHeartbeat, health, placement, auth,
                 configReload, quarantineCooldownSeconds, memberCredentials, null);
     }
@@ -116,9 +118,9 @@ public record FleetConfig(
                          Integer spawnReadyPollMs, Broker broker, Primary primary, Fleet fleet,
                          LeadHeartbeat leadHeartbeat, Health health, String placement, Auth auth,
                          ConfigReload configReload, Integer quarantineCooldownSeconds) {
-        this(bind, herdrSocket, profiles, guard, worktreeRoot, lifecycle, spawnReadyTimeoutMs,
+        this(bind, herdrSocket, null, profiles, guard, worktreeRoot, lifecycle, spawnReadyTimeoutMs,
                 spawnReadyPollMs, broker, primary, fleet, leadHeartbeat, health, placement, auth,
-                configReload, quarantineCooldownSeconds, null);
+                configReload, quarantineCooldownSeconds, null, null);
     }
 
     /** Default cooldown (CB-578 stage B) when {@code quarantineCooldownSeconds} is absent/non-positive. */
@@ -129,8 +131,8 @@ public record FleetConfig(
                          String worktreeRoot, Lifecycle lifecycle, Integer spawnReadyTimeoutMs,
                          Integer spawnReadyPollMs, Broker broker, Primary primary, Fleet fleet,
                          LeadHeartbeat leadHeartbeat, String placement, Auth auth) {
-        this(bind, herdrSocket, profiles, guard, worktreeRoot, lifecycle, spawnReadyTimeoutMs,
-                spawnReadyPollMs, broker, primary, fleet, leadHeartbeat, null, placement, auth, null, null);
+        this(bind, herdrSocket, null, profiles, guard, worktreeRoot, lifecycle, spawnReadyTimeoutMs,
+                spawnReadyPollMs, broker, primary, fleet, leadHeartbeat, null, placement, auth, null, null, null, null);
     }
 
     /** Back-compat form before the optional {@code health:} block was added. */
@@ -138,8 +140,8 @@ public record FleetConfig(
                          String worktreeRoot, Lifecycle lifecycle, Integer spawnReadyTimeoutMs,
                          Integer spawnReadyPollMs, Broker broker, Primary primary, Fleet fleet,
                          LeadHeartbeat leadHeartbeat, String placement, Auth auth, ConfigReload configReload) {
-        this(bind, herdrSocket, profiles, guard, worktreeRoot, lifecycle, spawnReadyTimeoutMs,
-                spawnReadyPollMs, broker, primary, fleet, leadHeartbeat, null, placement, auth, configReload, null);
+        this(bind, herdrSocket, null, profiles, guard, worktreeRoot, lifecycle, spawnReadyTimeoutMs,
+                spawnReadyPollMs, broker, primary, fleet, leadHeartbeat, null, placement, auth, configReload, null, null, null);
     }
 
     /** Back-compat form before the CB-578 stage B {@code quarantineCooldownSeconds} field was added. */
@@ -148,9 +150,9 @@ public record FleetConfig(
                          Integer spawnReadyPollMs, Broker broker, Primary primary, Fleet fleet,
                          LeadHeartbeat leadHeartbeat, Health health, String placement, Auth auth,
                          ConfigReload configReload) {
-        this(bind, herdrSocket, profiles, guard, worktreeRoot, lifecycle, spawnReadyTimeoutMs,
+        this(bind, herdrSocket, null, profiles, guard, worktreeRoot, lifecycle, spawnReadyTimeoutMs,
                 spawnReadyPollMs, broker, primary, fleet, leadHeartbeat, health, placement, auth,
-                configReload, null);
+                configReload, null, null, null);
     }
 
     /**
@@ -1320,7 +1322,7 @@ public record FleetConfig(
      * {@code fleetd.yaml} itself is gitignored.
      */
     static final Set<String> KNOWN_TOP_LEVEL_KEYS = Set.of(
-            "bind", "herdrSocket", "profiles", "guard", "worktreeRoot",
+            "bind", "herdrSocket", "memberHerdrSocket", "profiles", "guard", "worktreeRoot",
             "lifecycle", "spawnReadyTimeoutMs", "spawnReadyPollMs", "broker", "primary", "fleet",
             "leadHeartbeat", "health", "placement", "auth", "configReload", "quarantineCooldownSeconds",
             "memberCredentials", "coordinator");
@@ -1941,7 +1943,7 @@ public record FleetConfig(
                 : new MemberCredentials(null, List.of(), List.of());
         // coordinator is left as-is, like broker/primary above: null keeps no LeadMailbox opened,
         // and this ticket's Coordinator is config-only anyway (nothing yet reads it at startup).
-        return new FleetConfig(b, herdrSocket, profiles, g, worktreeRoot, l, timeout, pollMs,
+        return new FleetConfig(b, herdrSocket, memberHerdrSocket, profiles, g, worktreeRoot, l, timeout, pollMs,
                 broker, primary, f, leadHeartbeat, health, placementOrDefault, a, configReload,
                 quarantineCooldown, mc, coordinator);
     }

fleetd/src/main/java/dev/ltms/fleet/herdr/HerdrRouter.java

@@ -0,0 +1,40 @@
+package dev.ltms.fleet.herdr;
+
+import java.util.Objects;
+import java.util.function.Predicate;
+
+/** Routes lead operations and member operations to their owning herdr daemon. */
+public final class HerdrRouter implements AutoCloseable {
+    private final HerdrClient lead;
+    private final HerdrClient member;
+    private final AgentControl leadAgents;
+    private final AgentControl memberAgents;
+    private final WorkspaceControl leadSpaces;
+    private final WorkspaceControl memberSpaces;
+    private final Predicate<String> isLead;
+
+    public HerdrRouter(HerdrClient lead, HerdrClient member, Predicate<String> isLead) {
+        this.lead = Objects.requireNonNull(lead, "lead");
+        this.member = member != null ? member : lead;
+        this.isLead = Objects.requireNonNull(isLead, "isLead");
+        leadAgents = new AgentControl(this.lead);
+        memberAgents = this.member == this.lead ? leadAgents : new AgentControl(this.member);
+        leadSpaces = new WorkspaceControl(this.lead);
+        memberSpaces = this.member == this.lead ? leadSpaces : new WorkspaceControl(this.member);
+    }
+
+    public AgentControl leadAgents() { return leadAgents; }
+    public WorkspaceControl leadSpaces() { return leadSpaces; }
+    public AgentControl memberAgents() { return memberAgents; }
+    public WorkspaceControl memberSpaces() { return memberSpaces; }
+    public AgentControl agentsFor(String targetId) { return isLead.test(targetId) ? leadAgents : memberAgents; }
+
+    HerdrClient leadClient() { return lead; }
+    HerdrClient memberClient() { return member; }
+
+    @Override
+    public void close() {
+        lead.close();
+        if (member != lead) member.close();
+    }
+}

fleetd/src/main/java/dev/ltms/fleet/herdr/PaneLocator.java

@@ -2,6 +2,7 @@ package dev.ltms.fleet.herdr;
 
 import com.fasterxml.jackson.databind.JsonNode;
 
+import java.util.List;
 import java.util.Map;
 
 /**
@@ -13,33 +14,61 @@ import java.util.Map;
  * <p>herdr owns the PID→pane truth: {@code pane.process_info} reports each pane's {@code shell_pid}
  * and foreground process PIDs. This scans agent panes; a spawn-time {@code pid→terminal} cache is
  * the obvious optimization once wired into {@code ClaudeCodeLauncher}.
+ *
+ * <p>CB-185 split the fleet across two herdr daemons — lead operations on one, members on the
+ * other ({@code memberHerdrSocket}). A caller's pane can live on <em>either</em> daemon (a lead's
+ * MCP connection resolves against the lead daemon; a member's against the member daemon), so this
+ * must be able to search more than one client. {@link #PaneLocator(HerdrClient, HerdrClient)}
+ * searches the lead client first, then the member client, and collapses to a single scan when the
+ * two are the same object (the historical single-daemon deployment).
  */
 public final class PaneLocator {
 
-    private final HerdrClient herdr;
+    private final List<HerdrClient> herdrs;
 
+    /** Search only this client — the single-daemon deployment. */
     public PaneLocator(HerdrClient herdr) {
-        this.herdr = herdr;
+        this.herdrs = List.of(herdr);
+    }
+
+    /**
+     * Search {@code lead} first, then {@code member} — the two-daemon deployment (CB-185). When
+     * the caller passes the same client for both (no {@code memberHerdrSocket} configured), this
+     * collapses to one client and one scan, exactly {@link #PaneLocator(HerdrClient)}'s behaviour.
+     */
+    public PaneLocator(HerdrClient lead, HerdrClient member) {
+        this.herdrs = lead == member ? List.of(lead) : List.of(lead, member);
     }
 
     /**
      * The {@code terminal_id} of the agent pane whose process tree contains {@code pid}, or
-     * {@code null} if no agent pane owns it (e.g. the caller is the primary, or off-host).
+     * {@code null} if no agent pane on any searched daemon owns it (e.g. the caller is the
+     * primary, or off-host).
      */
     public String terminalForPid(long pid) {
         if (pid <= 0) {
             return null;
         }
+        for (HerdrClient herdr : herdrs) {
+            String terminal = terminalForPid(herdr, pid);
+            if (terminal != null) {
+                return terminal;
+            }
+        }
+        return null;
+    }
+
+    private static String terminalForPid(HerdrClient herdr, long pid) {
         for (JsonNode pane : herdr.call("pane.list", Map.of()).path("panes")) {
             String paneId = pane.path("pane_id").asText(null);
-            if (paneId != null && paneOwnsPid(paneId, pid)) {
+            if (paneId != null && paneOwnsPid(herdr, paneId, pid)) {
                 return pane.path("terminal_id").asText(null);
             }
         }
         return null;
     }
 
-    private boolean paneOwnsPid(String paneId, long pid) {
+    private static boolean paneOwnsPid(HerdrClient herdr, String paneId, long pid) {
         JsonNode info;
         try {
             info = herdr.call("pane.process_info", Map.of("pane_id", paneId)).path("process_info");

fleetd/src/main/java/dev/ltms/fleet/inject/Injector.java

@@ -2,6 +2,7 @@ package dev.ltms.fleet.inject;
 
 import dev.ltms.fleet.herdr.AgentControl;
 import dev.ltms.fleet.herdr.AgentStatus;
+import dev.ltms.fleet.herdr.HerdrRouter;
 import dev.ltms.fleet.msg.TurnToken;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -89,6 +90,7 @@ public final class Injector {
     public static final long POLL_INTERVAL_MILLIS = 250;
 
     private final AgentControl agents;
+    private final HerdrRouter router;
     private final TurnListener turnListener;
     private final Predicate<String> ready; // CB-113: a target is deliverable only when available
     private final Consumer<String> forget; // CB-114: clear a gone worker's readiness/presence
@@ -124,11 +126,25 @@ public final class Injector {
     public Injector(AgentControl agents, TurnListener turnListener, Predicate<String> ready,
                     Consumer<String> forget) {
         this.agents = agents;
+        this.router = null;
         this.turnListener = turnListener;
         this.ready = ready;
         this.forget = forget;
     }
 
+    public Injector(HerdrRouter router, TurnListener turnListener, Predicate<String> ready,
+                    Consumer<String> forget) {
+        this.agents = null;
+        this.router = router;
+        this.turnListener = turnListener;
+        this.ready = ready;
+        this.forget = forget;
+    }
+
+    private AgentControl agentsFor(String target) {
+        return router != null ? router.agentsFor(target) : agents;
+    }
+
     /** A pending message and the future that completes when it has been delivered. */
     private record Pending(String text, TurnToken token, CompletableFuture<Void> delivered) {
     }
@@ -253,7 +269,7 @@ public final class Injector {
                         if (p != null && ready.test(target)) {
                             t.notReadySincePoll = 0;
                             try {
-                                agents.send(target, p.text());
+                                agentsFor(target).send(target, p.text());
                                 t.queue.poll();
                                 t.awaitingPickup = true;
                                 t.awaitingCompletion = true;
@@ -313,7 +329,7 @@ public final class Injector {
         // thread while it holds the target lock.
         if (resubmit) {
             try {
-                agents.submit(target); // nudge a raced Enter so the pending paste submits
+                agentsFor(target).submit(target); // nudge a raced Enter so the pending paste submits
             } catch (RuntimeException e) {
                 log.debug("resubmit to {} failed (will retry next poll): {}", target, e.getMessage());
             }

fleetd/src/main/java/dev/ltms/fleet/inject/StatusPoller.java

@@ -3,6 +3,7 @@ package dev.ltms.fleet.inject;
 import dev.ltms.fleet.herdr.AgentControl;
 import dev.ltms.fleet.herdr.AgentStatus;
 import dev.ltms.fleet.herdr.HerdrException;
+import dev.ltms.fleet.herdr.HerdrRouter;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -22,6 +23,7 @@ public final class StatusPoller {
     private static final Logger log = LoggerFactory.getLogger(StatusPoller.class);
 
     private final AgentControl agents;
+    private final HerdrRouter router;
     private final Injector injector;
     private final StatusRefiner refiner;
     private final long intervalMillis;
@@ -35,11 +37,24 @@ public final class StatusPoller {
     public StatusPoller(AgentControl agents, Injector injector, StatusRefiner refiner,
                         long intervalMillis) {
         this.agents = agents;
+        this.router = null;
         this.injector = injector;
         this.refiner = refiner;
         this.intervalMillis = intervalMillis;
     }
 
+    public StatusPoller(HerdrRouter router, Injector injector, long intervalMillis) {
+        this.agents = null;
+        this.router = router;
+        this.injector = injector;
+        // CB-185: this refiner's own AgentControl (member) is only a default for the legacy 2-arg
+        // refine() overload — the loop below always calls the 3-arg refine(target, raw, control)
+        // with the per-target control from router.agentsFor(target), so a lead target is refined
+        // against the LEAD daemon even though this field points at the member one.
+        this.refiner = new StatusRefiner(router.memberAgents());
+        this.intervalMillis = intervalMillis;
+    }
+
     /** Start the polling loop on a virtual thread. Idempotent. */
     public synchronized void start() {
         if (running) return;
@@ -56,7 +71,11 @@ public final class StatusPoller {
                 try {
                     // herdr's agent_status can misreport a settled worker as `unknown`; refine it
                     // against the pane content before it drives delivery/completion (CB-115).
-                    AgentStatus status = refiner.refine(target, agents.status(target));
+                    // CB-185: refine THROUGH the same control the raw status came from — a router
+                    // splits lead/member targets across two herdr daemons, and reading a lead's pane
+                    // through the (fixed) member refiner never finds it, wedging that lead at UNKNOWN.
+                    AgentControl control = router != null ? router.agentsFor(target) : agents;
+                    AgentStatus status = refiner.refine(target, control.status(target), control);
                     injector.onStatus(target, status);
                 } catch (HerdrException e) {
                     // The worker's agent is gone — stop trying and unblock its waiters.

fleetd/src/main/java/dev/ltms/fleet/inject/StatusRefiner.java

@@ -41,15 +41,32 @@ public final class StatusRefiner {
     }
 
     /**
-     * Return a trustworthy status for {@code target}. Any non-{@code UNKNOWN} {@code raw} is returned
-     * unchanged; an {@code UNKNOWN} triggers a pane read and content classification. A read failure
-     * leaves it {@code UNKNOWN} (the safe default: no delivery, and the stall path still applies).
+     * Return a trustworthy status for {@code target}, reading its pane through this refiner's own
+     * {@link AgentControl}. Equivalent to {@link #refine(String, AgentStatus, AgentControl)} with
+     * that control — kept for callers that only ever talk to one herdr daemon.
      */
     public AgentStatus refine(String target, AgentStatus raw) {
+        return refine(target, raw, agents);
+    }
+
+    /**
+     * Return a trustworthy status for {@code target}. Any non-{@code UNKNOWN} {@code raw} is returned
+     * unchanged; an {@code UNKNOWN} triggers a pane read (through {@code control}) and content
+     * classification. A read failure leaves it {@code UNKNOWN} (the safe default: no delivery, and
+     * the stall path still applies).
+     *
+     * <p>CB-185: {@code control} must be the {@link AgentControl} for the <em>same</em> daemon the
+     * raw status was sampled from — a router splits lead and member targets across two herdr
+     * daemons, and reading a lead's pane through the member client (or vice versa) fails to find
+     * the pane and leaves the target wedged at {@code UNKNOWN} forever. Callers that route per
+     * target (e.g. {@code StatusPoller}) must pass that target's control explicitly rather than
+     * relying on the control fixed at construction.
+     */
+    public AgentStatus refine(String target, AgentStatus raw, AgentControl control) {
         if (raw != AgentStatus.UNKNOWN) return raw;
         String pane;
         try {
-            pane = agents.read(target, PROBE_SOURCE);
+            pane = control.read(target, PROBE_SOURCE);
         } catch (RuntimeException e) {
             log.debug("status refine read for {} failed; leaving UNKNOWN: {}", target, e.getMessage());
             return AgentStatus.UNKNOWN;

fleetd/src/main/java/dev/ltms/fleet/msg/MessageService.java

@@ -2,6 +2,7 @@ package dev.ltms.fleet.msg;
 
 import dev.ltms.fleet.herdr.AgentControl;
 import dev.ltms.fleet.herdr.AgentStatus;
+import dev.ltms.fleet.herdr.HerdrRouter;
 import dev.ltms.fleet.inject.Injector;
 import dev.ltms.fleet.metrics.FleetMetrics;
 import dev.ltms.fleet.metrics.Metrics;
@@ -189,6 +190,7 @@ public final class MessageService {
     }
 
     private final AgentControl agents;
+    private final HerdrRouter router;
     private final Injector injector;
     private final Rendezvous rendezvous;
     private final ReplyInbox inbox;
@@ -257,6 +259,7 @@ public final class MessageService {
     MessageService(AgentControl agents, Injector injector, Rendezvous rendezvous, ReplyInbox inbox,
                    ReplyPushLoop pushLoop, Metrics metrics, LongSupplier nowNanos) {
         this.agents = agents;
+        this.router = null;
         this.injector = injector;
         this.rendezvous = rendezvous;
         this.inbox = inbox;
@@ -265,6 +268,20 @@ public final class MessageService {
         this.nowNanos = nowNanos;
     }
 
+    public MessageService(HerdrRouter router, Injector injector, Rendezvous rendezvous, ReplyInbox inbox,
+                          ReplyPushLoop pushLoop, Metrics metrics) {
+        this.agents = null;
+        this.router = router;
+        this.injector = injector;
+        this.rendezvous = rendezvous;
+        this.inbox = inbox;
+        this.pushLoop = pushLoop;
+        this.metrics = metrics;
+        this.nowNanos = System::nanoTime;
+    }
+
+    private AgentControl agentsFor(String target) { return router != null ? router.agentsFor(target) : agents; }
+
     /** Create with an explicit {@link ReplyInbox} and no push loop. */
     public MessageService(AgentControl agents, Injector injector, Rendezvous rendezvous, ReplyInbox inbox) {
         this(agents, injector, rendezvous, inbox, null);
@@ -277,7 +294,7 @@ public final class MessageService {
 
     /** Current lifecycle status of a worker (the {@code GET /sessions/{id}/status} surface). */
     public AgentStatus status(String target) {
-        return agents.status(target);
+        return agentsFor(target).status(target);
     }
 
     /** Read-only delegation fact for fleet views. */
@@ -788,7 +805,7 @@ public final class MessageService {
     /** Best-effort live worker status for a pending poll; never throws (a lookup error is just noise). */
     private String liveStatus(String target) {
         try {
-            return agents.status(target).name().toLowerCase();
+            return agentsFor(target).status(target).name().toLowerCase();
         } catch (RuntimeException e) {
             return "unknown";
         }

fleetd/src/main/java/dev/ltms/fleet/rest/FleetApp.java

@@ -55,7 +55,8 @@ public final class FleetApp {
     /** Context attribute under which the resolved caller is stashed by the auth filter. */
     private static final String CALLER = "fleetd.caller";
 
-    private final HerdrClient herdr;
+    private final HerdrClient herdr;       // lead daemon
+    private final HerdrClient memberHerdr; // CB-185: member daemon (same object when unconfigured)
     private final PeerLauncher workers;
     private final SessionManager sessions; // CB-301: authoritative session registry
     private final MessageService messages;
@@ -95,7 +96,23 @@ public final class FleetApp {
                        MessageService messages, MemberPresence presence,
                        HttpServlet mcpServlet, CallerResolver auth, Metrics metrics,
                        Predicate<String> deliverable) {
+        this(herdr, herdr, workers, sessions, messages, presence, mcpServlet, auth, metrics, deliverable);
+    }
+
+    /**
+     * @param herdr       the lead daemon's client
+     * @param memberHerdr the member daemon's client (CB-185); pass the same instance as
+     *                    {@code herdr} for a single-daemon deployment — {@code healthz}/{@code
+     *                    sessions} then make exactly one herdr call each, unchanged from before
+     *                    the two-daemon router existed
+     * @param deliverable the injector's readiness gate, shared so status reports its real result
+     */
+    public FleetApp(HerdrClient herdr, HerdrClient memberHerdr, PeerLauncher workers, SessionManager sessions,
+                       MessageService messages, MemberPresence presence,
+                       HttpServlet mcpServlet, CallerResolver auth, Metrics metrics,
+                       Predicate<String> deliverable) {
         this.herdr = herdr;
+        this.memberHerdr = memberHerdr != null ? memberHerdr : herdr;
         this.workers = workers;
         this.sessions = sessions;
         this.messages = messages;
@@ -190,30 +207,64 @@ public final class FleetApp {
         ctx.status(200).contentType("text/plain; version=0.0.4; charset=utf-8").result(metrics.render());
     }
 
-    /** Liveness + herdr reachability. 200 when herdr answers ping, 503 otherwise. */
+    /**
+     * Liveness + herdr reachability. 200 only when BOTH daemons answer ping — 503 otherwise
+     * (CB-185). With no {@code memberHerdrSocket} configured {@code memberHerdr == herdr}, so this
+     * makes exactly the one {@code ping} call it always did and reports the same body; with a
+     * second daemon configured, a member daemon that is down must not be masked by a healthy lead
+     * daemon — every spawn goes through the member daemon and would otherwise fail silently behind
+     * a green {@code /healthz}.
+     */
     private void healthz(Context ctx) {
+        JsonNode pong;
         try {
-            JsonNode pong = herdr.call("ping");
-            ctx.status(200).json(Map.of(
-                    "status", "ok",
-                    "herdr", Map.of(
-                            "version", pong.path("version").asText(""),
-                            "protocol", pong.path("protocol").asInt())));
+            pong = herdr.call("ping");
         } catch (HerdrException e) {
             ctx.status(503).json(Map.of(
                     "status", "degraded",
                     "herdr", "unreachable",
                     "detail", e.getMessage()));
+            return;
         }
+        if (memberHerdr != herdr) {
+            try {
+                memberHerdr.call("ping");
+            } catch (HerdrException e) {
+                ctx.status(503).json(Map.of(
+                        "status", "degraded",
+                        "herdr", "member unreachable",
+                        "detail", e.getMessage()));
+                return;
+            }
+        }
+        ctx.status(200).json(Map.of(
+                "status", "ok",
+                "herdr", Map.of(
+                        "version", pong.path("version").asText(""),
+                        "protocol", pong.path("protocol").asInt())));
     }
 
-    /** Sessions view derived from herdr {@code workspace.list} (one workspace → one row). */
+    /**
+     * Sessions view derived from herdr {@code workspace.list} (one workspace → one row), merged
+     * across both daemons (CB-185). With no {@code memberHerdrSocket} configured {@code
+     * memberHerdr == herdr}, so this calls {@code workspace.list} exactly once, same as before the
+     * router existed; with a second daemon configured, calling it twice would silently drop every
+     * member workspace (they live on the member daemon only).
+     */
     private void sessions(Context ctx) {
         if (!allow(ctx, Authz.Action.READ, null)) {
             return;
         }
-        JsonNode result = herdr.call("workspace.list");
         List<Map<String, Object>> out = new ArrayList<>();
+        collectSessions(herdr, out);
+        if (memberHerdr != herdr) {
+            collectSessions(memberHerdr, out);
+        }
+        ctx.status(200).json(Map.of("sessions", out));
+    }
+
+    private static void collectSessions(HerdrClient client, List<Map<String, Object>> out) {
+        JsonNode result = client.call("workspace.list");
         for (JsonNode w : result.path("workspaces")) {
             out.add(Map.of(
                     "id", w.path("workspace_id").asText(""),
@@ -222,7 +273,6 @@ public final class FleetApp {
                     "paneCount", w.path("pane_count").asInt(),
                     "agentStatus", w.path("agent_status").asText("unknown")));
         }
-        ctx.status(200).json(Map.of("sessions", out));
     }
 
     /** Discovery: every agent herdr tracks, keyed by its Claude session UUID. */

fleetd/src/test/java/dev/ltms/fleet/FleetdConnectionIdentityConstructionTest.java

@@ -0,0 +1,31 @@
+package dev.ltms.fleet;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * CB-185: {@code ConnectionIdentity} must resolve a caller's pane on EITHER herdr daemon (a
+ * lead's MCP connection resolves against the lead daemon; a member's against the member daemon).
+ * Pinning {@code PaneLocator} to {@code memberHerdr} alone — the bug this guards against — leaves
+ * every lead's own connection unresolvable ({@code callerTerminal == null}) the moment
+ * {@code memberHerdrSocket} names a second daemon, which breaks {@code fleet_reply}/{@code
+ * fleet_ask} and {@code fleet_whoami} for a lead. A unit test on {@link
+ * dev.ltms.fleet.herdr.PaneLocator} alone (see {@code PaneLocatorTest}) proves the class CAN
+ * search two clients, but not that {@code Fleetd.main} actually wires it that way — hence this
+ * source-level assertion, the same technique {@code FleetdHerdrControlConstructionTest} uses.
+ */
+class FleetdConnectionIdentityConstructionTest {
+    @Test
+    void connectionIdentitySearchesBothDaemonsNotJustTheMemberOne() throws Exception {
+        String source = Files.readString(Path.of("src/main/java/dev/ltms/fleet/Fleetd.java"));
+        assertFalse(source.contains("new PaneLocator(memberHerdr)"),
+                "PaneLocator must not be pinned to the member daemon alone — a lead's own "
+                        + "connection resolves against the LEAD daemon and would never be found");
+        assertTrue(source.contains("new PaneLocator(herdr, memberHerdr)"),
+                "PaneLocator must search the lead daemon first, then the member daemon");
+    }
+}

fleetd/src/test/java/dev/ltms/fleet/FleetdFleetAppConstructionTest.java

@@ -0,0 +1,29 @@
+package dev.ltms.fleet;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * CB-185: {@code FleetApp} must be constructed with BOTH herdr clients (the lead's and the
+ * member's), never the raw lead-only {@code herdr}. Passing only {@code herdr} — the bug this
+ * guards against — makes {@code GET /healthz} green while the member daemon is down (so every
+ * spawn fails invisibly) and silently drops every member workspace from {@code GET /sessions}.
+ * A behavioural test on {@code FleetApp} alone (see {@code FleetAppTwoDaemonTest}) proves the
+ * class merges/gates correctly when given two clients, but not that {@code Fleetd.main} actually
+ * passes it two — hence this source-level assertion, mirroring
+ * {@code FleetdHerdrControlConstructionTest}.
+ */
+class FleetdFleetAppConstructionTest {
+    @Test
+    void fleetAppIsConstructedWithBothHerdrDaemons() throws Exception {
+        String source = Files.readString(Path.of("src/main/java/dev/ltms/fleet/Fleetd.java"));
+        assertFalse(source.contains("new FleetApp(herdr, workers,"),
+                "FleetApp must not be constructed with the lead-only herdr client");
+        assertTrue(source.contains("new FleetApp(herdr, memberHerdr, workers,"),
+                "FleetApp must be constructed with both the lead and the member herdr client");
+    }
+}

fleetd/src/test/java/dev/ltms/fleet/FleetdHerdrControlConstructionTest.java

@@ -0,0 +1,17 @@
+package dev.ltms.fleet;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+
+class FleetdHerdrControlConstructionTest {
+    @Test
+    void fleetdDelegatesStatefulControlsToTheRouter() throws Exception {
+        // AgentControl caches paneByTerminal, so the router must be its only production factory.
+        String source = Files.readString(Path.of("src/main/java/dev/ltms/fleet/Fleetd.java"));
+        assertFalse(source.contains("new AgentControl("));
+        assertFalse(source.contains("new WorkspaceControl("));
+    }
+}

fleetd/src/test/java/dev/ltms/fleet/herdr/FakeHerdr.java

@@ -40,6 +40,7 @@ public final class FakeHerdr implements HerdrClient {
     private int workerTabPaneCount = 1;
     private String paneCloseErrorCode = null;
     private String agentSendErrorCode = null;
+    private boolean noPanes = false;
     private volatile String agentStatus = "idle"; // steady-state agent.get status
     private volatile String readText = "worker transcript tail"; // canned agent.read output
     private int pinnedStarts = 0;   // how many upcoming agent.start calls report a fixed pane
@@ -75,6 +76,15 @@ public final class FakeHerdr implements HerdrClient {
         return this;
     }
 
+    /**
+     * Make {@code pane.list} report no panes at all — models a second herdr daemon (CB-185) that
+     * simply does not host the pane a {@link PaneLocator} is searching for.
+     */
+    public FakeHerdr withNoPanes() {
+        this.noPanes = true;
+        return this;
+    }
+
     /** Set the {@code agent_status} that {@code agent.get} reports (drives the injector). */
     public FakeHerdr agentStatus(String status) {
         this.agentStatus = status;
@@ -268,7 +278,9 @@ public final class FakeHerdr implements HerdrClient {
                 case "pane.get" -> mapper.readTree("""
                         {"type":"pane_info","pane":{"pane_id":"w9:pW","workspace_id":"w9",
                           "tab_id":"w9:t2","agent_status":"idle"}}""");
-                case "pane.list" -> mapper.readTree("""
+                case "pane.list" -> noPanes
+                        ? mapper.readTree("{\"type\":\"pane_list\",\"panes\":[]}")
+                        : mapper.readTree("""
                         {"type":"pane_list","panes":[
                           {"pane_id":"w2:p7","terminal_id":"term_a","workspace_id":"w2","tab_id":"w2:t7","agent":"claude"},
                           {"pane_id":"w2:p9","terminal_id":"term_shell","workspace_id":"w2","tab_id":"w2:t8"}]}""");

fleetd/src/test/java/dev/ltms/fleet/herdr/HerdrRouterTest.java

@@ -0,0 +1,31 @@
+package dev.ltms.fleet.herdr;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertSame;
+import static org.junit.jupiter.api.Assertions.assertNotSame;
+
+class HerdrRouterTest {
+    @Test
+    void absentMemberClientSharesControlsForEveryTarget() {
+        FakeHerdr client = new FakeHerdr();
+        HerdrRouter router = new HerdrRouter(client, null, id -> id.equals("lead"));
+
+        assertSame(router.leadAgents(), router.memberAgents());
+        assertSame(router.leadSpaces(), router.memberSpaces());
+        assertSame(router.leadAgents(), router.agentsFor("lead"));
+        assertSame(router.leadAgents(), router.agentsFor("member"));
+    }
+
+    @Test
+    void separateClientsRouteLeadAndMemberTargets() {
+        FakeHerdr lead = new FakeHerdr();
+        FakeHerdr member = new FakeHerdr();
+        HerdrRouter router = new HerdrRouter(lead, member, id -> id.equals("lead"));
+
+        assertNotSame(router.leadAgents(), router.memberAgents());
+        assertNotSame(router.leadSpaces(), router.memberSpaces());
+        assertSame(router.leadAgents(), router.agentsFor("lead"));
+        assertSame(router.memberAgents(), router.agentsFor("member"));
+    }
+}

fleetd/src/test/java/dev/ltms/fleet/herdr/PaneLocatorTest.java

@@ -24,4 +24,43 @@ class PaneLocatorTest {
         assertNull(loc.terminalForPid(0));
         assertNull(loc.terminalForPid(-1));
     }
+
+    // --- two-daemon fallback (CB-185) -----------------------------------------
+
+    @Test
+    void fallsBackToTheMemberClientWhenTheLeadHasNoMatch() {
+        // The caller's pane lives on the member daemon only (e.g. the caller is a spawned
+        // member) — the lead client reports no panes at all, so the locator must fall back.
+        HerdrClient lead = new FakeHerdr().withNoPanes();
+        HerdrClient member = new FakeHerdr();
+        PaneLocator two = new PaneLocator(lead, member);
+        assertEquals("term_a", two.terminalForPid(FakeHerdr.WORKER_PID));
+    }
+
+    @Test
+    void searchesTheLeadClientBeforeTheMemberClient() {
+        // The caller's pane lives on the LEAD daemon (e.g. the caller is a peer lead) — with two
+        // daemons, resolving it must not depend on the member client having a matching pane.
+        HerdrClient lead = new FakeHerdr();
+        HerdrClient member = new FakeHerdr().withNoPanes();
+        PaneLocator two = new PaneLocator(lead, member);
+        assertEquals("term_a", two.terminalForPid(FakeHerdr.WORKER_PID));
+    }
+
+    @Test
+    void nullWhenNeitherClientHasTheMatch() {
+        PaneLocator two = new PaneLocator(new FakeHerdr().withNoPanes(), new FakeHerdr().withNoPanes());
+        assertNull(two.terminalForPid(FakeHerdr.WORKER_PID));
+    }
+
+    @Test
+    void collapsesToOneScanWhenLeadAndMemberAreTheSameClient() {
+        // The single-daemon deployment (no memberHerdrSocket configured): the two-arg constructor
+        // must behave exactly like the one-arg constructor, including making only one herdr call.
+        FakeHerdr shared = new FakeHerdr();
+        PaneLocator two = new PaneLocator(shared, shared);
+        assertEquals("term_a", two.terminalForPid(FakeHerdr.WORKER_PID));
+        long paneListCalls = shared.calls.stream().filter(c -> c.method().equals("pane.list")).count();
+        assertEquals(1, paneListCalls, "same-object lead/member must scan exactly once, not twice");
+    }
 }

fleetd/src/test/java/dev/ltms/fleet/inject/StatusPollerRoutingTest.java

@@ -0,0 +1,75 @@
+package dev.ltms.fleet.inject;
+
+import dev.ltms.fleet.herdr.FakeHerdr;
+import dev.ltms.fleet.herdr.HerdrRouter;
+import dev.ltms.fleet.msg.TestTurnTokens;
+import org.junit.jupiter.api.Test;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+/**
+ * CB-185: with a router split across two herdr daemons, {@link StatusPoller} must refine a raw
+ * {@code UNKNOWN} status by reading the pane content from the SAME daemon the status was sampled
+ * from — the lead daemon for a lead target, the member daemon for a member target. Reading the
+ * wrong daemon never finds the pane, classification stays {@code UNKNOWN} forever, and the
+ * status-gated {@link Injector} wedges: a queued message is never delivered.
+ *
+ * <p>This exercises the real production classes ({@code StatusPoller(HerdrRouter, ...)},
+ * {@code Injector(HerdrRouter, ...)}) wired together, not a hand-built object graph — the earlier
+ * three CB-185 bugs all passed exactly that kind of test while the real wiring stayed broken.
+ */
+class StatusPollerRoutingTest {
+
+    private static final String LEAD_TARGET = "term_a";
+
+    @Test
+    void refinesALeadTargetFromTheLeadDaemonAndDelivers() throws Exception {
+        // The lead daemon's pane is at a settled idle prompt; the member daemon's pane content is
+        // unclassifiable garbage. A correct refiner reads the LEAD daemon and delivers.
+        FakeHerdr leadHerdr = new FakeHerdr().agentStatus("unknown").readText("⏺ answer\n❯ ");
+        FakeHerdr memberHerdr = new FakeHerdr().agentStatus("unknown")
+                .readText("garbled ansi noise with no prompt");
+        HerdrRouter router = new HerdrRouter(leadHerdr, memberHerdr, LEAD_TARGET::equals);
+        Injector injector = new Injector(router, TurnListener.NOOP, _ -> true, _ -> {
+        });
+        StatusPoller poller = new StatusPoller(router, injector, 10);
+        poller.start();
+        try {
+            CompletableFuture<Void> delivered =
+                    injector.enqueue(LEAD_TARGET, "via-poller", TestTurnTokens.inert(LEAD_TARGET));
+            // Must resolve quickly: refining against the WRONG daemon (member) never classifies
+            // out of UNKNOWN, so this would time out under the bug.
+            delivered.get(2, TimeUnit.SECONDS);
+        } finally {
+            poller.stop();
+        }
+        assertTrue(leadHerdr.called("agent.read"), "refine must probe the LEAD daemon's pane content");
+    }
+
+    @Test
+    void aLeadTargetNeverDeliversWhenOnlyTheMemberDaemonIsClassifiable() throws Exception {
+        // Inverted control: the member daemon's content WOULD classify to idle, but this is a lead
+        // target — a correct implementation must not use it, so delivery must NOT happen.
+        FakeHerdr leadHerdr = new FakeHerdr().agentStatus("unknown")
+                .readText("garbled ansi noise with no prompt");
+        FakeHerdr memberHerdr = new FakeHerdr().agentStatus("unknown").readText("⏺ answer\n❯ ");
+        HerdrRouter router = new HerdrRouter(leadHerdr, memberHerdr, LEAD_TARGET::equals);
+        Injector injector = new Injector(router, TurnListener.NOOP, _ -> true, _ -> {
+        });
+        StatusPoller poller = new StatusPoller(router, injector, 10);
+        poller.start();
+        try {
+            CompletableFuture<Void> delivered =
+                    injector.enqueue(LEAD_TARGET, "via-poller", TestTurnTokens.inert(LEAD_TARGET));
+            assertThrows(TimeoutException.class, () -> delivered.get(500, TimeUnit.MILLISECONDS),
+                    "a lead target must never be refined from the member daemon's pane content");
+        } finally {
+            poller.stop();
+        }
+    }
+}

fleetd/src/test/java/dev/ltms/fleet/inject/StatusRefinerTest.java

@@ -85,4 +85,34 @@ class StatusRefinerTest {
 
         assertEquals(AgentStatus.UNKNOWN, refiner.refine("term_a", AgentStatus.UNKNOWN));
     }
+
+    // --- refine(target, raw, control) — CB-185 per-call routing ---------------
+
+    @Test
+    void threeArgRefineReadsThroughTheGivenControlNotTheConstructedOne() {
+        // The refiner is CONSTRUCTED with one control (standing in for "the member daemon"), but
+        // a call names a DIFFERENT control (standing in for "the lead daemon") — the read must go
+        // to the one passed to the call, since that is the daemon the raw status came from.
+        FakeHerdr constructedWith = new FakeHerdr().readText("nothing recognizable here");
+        FakeHerdr passedToCall = new FakeHerdr().readText("⏺ answer\n❯ ");
+        StatusRefiner refiner = new StatusRefiner(new AgentControl(constructedWith));
+
+        AgentStatus result = refiner.refine("term_a", AgentStatus.UNKNOWN, new AgentControl(passedToCall));
+
+        assertEquals(AgentStatus.IDLE, result, "must classify from the PASSED control's pane content");
+        assertTrue(passedToCall.called("agent.read"));
+        assertFalse(constructedWith.called("agent.read"),
+                "the control fixed at construction must not be read when a call-site control is given");
+    }
+
+    @Test
+    void twoArgRefineStillReadsTheConstructedControl() {
+        // The legacy 2-arg overload (single-daemon callers) must keep using the constructed
+        // control — this is refine(target, raw, control) called with the field as `control`.
+        FakeHerdr herdr = new FakeHerdr().readText("⏺ answer\n❯ ");
+        StatusRefiner refiner = new StatusRefiner(new AgentControl(herdr));
+
+        assertEquals(AgentStatus.IDLE, refiner.refine("term_a", AgentStatus.UNKNOWN));
+        assertTrue(herdr.called("agent.read"));
+    }
 }

fleetd/src/test/java/dev/ltms/fleet/rest/FleetAppTwoDaemonTest.java

@@ -0,0 +1,99 @@
+package dev.ltms.fleet.rest;
+
+import dev.ltms.fleet.herdr.FakeHerdr;
+import dev.ltms.fleet.herdr.HerdrClient;
+import io.javalin.Javalin;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+/**
+ * CB-185: with a router split across two herdr daemons (lead + {@code memberHerdrSocket}),
+ * {@link FleetApp#healthz} must require BOTH daemons to answer and {@link FleetApp#sessions}
+ * (which the {@code GET /sessions} route calls) must merge workspaces from both — the bug this
+ * guards against had {@code FleetApp} constructed with the raw lead-only client, so a down member
+ * daemon was invisible behind a green {@code /healthz} (every spawn then fails) and every member
+ * workspace was silently dropped from {@code GET /sessions}.
+ *
+ * <p>Builds the real {@link FleetApp} directly (not a hand-rolled stand-in) against only the two
+ * herdr clients — the other collaborators are unused by the two routes under test here.
+ */
+class FleetAppTwoDaemonTest {
+
+    private final HttpClient http = HttpClient.newHttpClient();
+    private Javalin app;
+
+    @AfterEach
+    void stop() {
+        if (app != null) app.stop();
+    }
+
+    private int start(HerdrClient lead, HerdrClient member) {
+        app = new FleetApp(lead, member, null, null, null, null, null, null, null, ignored -> false)
+                .build().start("127.0.0.1", 0);
+        return app.port();
+    }
+
+    private HttpResponse<String> get(int port, String path) throws Exception {
+        HttpRequest req = HttpRequest.newBuilder(URI.create("http://127.0.0.1:" + port + path)).GET().build();
+        return http.send(req, HttpResponse.BodyHandlers.ofString());
+    }
+
+    @Test
+    void healthzIsGreenWhenBothDaemonsAnswer() throws Exception {
+        int port = start(new FakeHerdr(), new FakeHerdr());
+        assertEquals(200, get(port, "/healthz").statusCode());
+    }
+
+    @Test
+    void healthzIsDegradedWhenOnlyTheMemberDaemonIsDown() throws Exception {
+        int port = start(new FakeHerdr(), new FakeHerdr().healthy(false));
+        HttpResponse<String> res = get(port, "/healthz");
+        assertEquals(503, res.statusCode(),
+                "a down MEMBER daemon must not be masked by a healthy lead — every spawn goes "
+                        + "through the member daemon");
+    }
+
+    @Test
+    void healthzIsDegradedWhenOnlyTheLeadDaemonIsDown() throws Exception {
+        int port = start(new FakeHerdr().healthy(false), new FakeHerdr());
+        assertEquals(503, get(port, "/healthz").statusCode());
+    }
+
+    @Test
+    void healthzMakesExactlyOneCallWhenLeadAndMemberAreTheSameClient() throws Exception {
+        // Single-daemon deployment (no memberHerdrSocket) — must be byte-for-byte the old
+        // behaviour: one ping call, 200 on success.
+        FakeHerdr shared = new FakeHerdr();
+        int port = start(shared, shared);
+        assertEquals(200, get(port, "/healthz").statusCode());
+        long pings = shared.calls.stream().filter(c -> c.method().equals("ping")).count();
+        assertEquals(1, pings, "single-daemon deployment must make exactly one ping call");
+    }
+
+    @Test
+    void sessionsMergesWorkspacesFromBothDaemons() throws Exception {
+        FakeHerdr lead = new FakeHerdr();
+        FakeHerdr member = new FakeHerdr().withWorkspace("w9", "member-only-workspace");
+        int port = start(lead, member);
+        HttpResponse<String> res = get(port, "/sessions");
+        assertEquals(200, res.statusCode(), res.body());
+        assertTrue(res.body().contains("member-only-workspace"),
+                "GET /sessions must not silently drop the member daemon's workspaces");
+    }
+
+    @Test
+    void sessionsMakesExactlyOneWorkspaceListCallWhenLeadAndMemberAreTheSameClient() throws Exception {
+        FakeHerdr shared = new FakeHerdr();
+        int port = start(shared, shared);
+        assertEquals(200, get(port, "/sessions").statusCode());
+        long calls = shared.calls.stream().filter(c -> c.method().equals("workspace.list")).count();
+        assertEquals(1, calls, "single-daemon deployment must call workspace.list exactly once");
+    }
+}