CB-596: member credential blocking is config-driven deny-by-default, not one hardcoded name

Replaces CB-592's single hardcoded GITEA_ACCESS_TOKEN shadow in HerdrPeerLauncher
with BridgedConfig.MemberCredentials (memberCredentials: policy/allow/known).
Every known name not also allowed is overlaid with a sentinel; an unrecognized
policy value refuses at load; a credential-shaped host env var on neither list
is logged as a gap (name only, never a value). bridged.yaml is gitignored, so
the 31 measured names + 4-name allowlist ship as a commented block in
bridged.example.yaml for the operator to apply live.

bridged/src/main/java/dev/ltms/bridged/Bridged.java

@@ -139,13 +139,15 @@ public final class Bridged {
             adapters.add(new ClaudeCodeLauncher(agents, spaces, guard,
                     claudeProfiles, cfg.effectiveDefaultProfile(), System::getenv,
                     cfg.spawnReadyTimeoutMs(), cfg.spawnReadyPollMs(),
-                    () -> config.get().fleet()));
+                    () -> config.get().fleet(),
+                    () -> config.get().memberCredentials()));
         }
         if (!opencodeProfiles.isEmpty()) {
             adapters.add(new OpenCodeLauncher(agents, spaces,
                     opencodeProfiles, cfg.effectiveDefaultProfile(), System::getenv,
                     cfg.spawnReadyTimeoutMs(), cfg.spawnReadyPollMs(),
-                    () -> config.get().fleet()));
+                    () -> config.get().fleet(),
+                    () -> config.get().memberCredentials()));
         }
         AtomicReference<Function<String, Integer>> liveCountRef = new AtomicReference<>(_ -> 0);
         // CB-578 stage B: one quarantine tracker for the whole daemon, shared between the launcher

bridged/src/main/java/dev/ltms/bridged/config/BridgedConfig.java

@@ -66,6 +66,9 @@ import java.util.Set;
  *                      {@code BackendQuarantine} built at startup, so it is DEFERRED: changing it
  *                      needs a restart, and a quarantine already running keeps whatever cooldown was
  *                      live when it started.
+ * @param memberCredentials deny-by-default policy (CB-596) for which of the operator's own host
+ *                      credentials a spawned member's pane inherits. {@code null} (the block
+ *                      omitted) blocks nothing — see {@link MemberCredentials}.
  */
 @JsonIgnoreProperties(ignoreUnknown = true)
 public record BridgedConfig(
@@ -85,7 +88,19 @@ public record BridgedConfig(
         String placement,
         Auth auth,
         ConfigReload configReload,
-        Integer quarantineCooldownSeconds) {
+        Integer quarantineCooldownSeconds,
+        MemberCredentials memberCredentials) {
+
+    /** Back-compat form before the CB-596 {@code memberCredentials:} block was added. */
+    public BridgedConfig(Bind bind, String herdrSocket, Map<String, Profile> profiles, Guard guard,
+                         String worktreeRoot, Lifecycle lifecycle, Integer spawnReadyTimeoutMs,
+                         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,
+                spawnReadyPollMs, broker, primary, fleet, leadHeartbeat, health, placement, auth,
+                configReload, quarantineCooldownSeconds, null);
+    }
 
     /** Default cooldown (CB-578 stage B) when {@code quarantineCooldownSeconds} is absent/non-positive. */
     public static final int DEFAULT_QUARANTINE_COOLDOWN_SECONDS = 1800;
@@ -926,6 +941,58 @@ public record BridgedConfig(
         }
     }
 
+    /**
+     * CB-596: which of the operator's own host credentials a spawned member's pane may inherit.
+     *
+     * <p>A herdr pane runs a login shell that re-sources the operator's own secret store, so a
+     * member inherits every credential the operator's shell holds — measured at 31 names on this
+     * host, of which only one ({@code GITEA_ACCESS_TOKEN}) used to be blocked, and that block was a
+     * single name hardcoded in {@link HerdrPeerLauncher} rather than driven by config (gitea issue
+     * #82). This record replaces that hardcoded shadow with a config-driven one.
+     *
+     * <p><b>deny-by-default, not a deny-list.</b> A deny-list (block these specific names, let
+     * everything else through) is silently wrong the moment a new secret is added to the operator's
+     * store — nothing would ever report it. Deny-by-default inverts that: {@link #known} bounds the
+     * blast radius to names the operator has actually enumerated, and every one of them is blocked
+     * UNLESS it is also in {@link #allow}. A name that shows up in neither list is not silently
+     * allowed — see {@code HerdrPeerLauncher}'s gap detector, which logs it.
+     *
+     * @param policy how the block is computed. Only {@link #POLICY_DENY_BY_DEFAULT} is understood
+     *               today; {@code null}/blank defaults to it. An operator's own deny-list is
+     *               deliberately not supported — see above.
+     * @param allow  credential names a member legitimately needs (e.g. the gateway token it reaches
+     *               the LLM through, the repo-scoped forge token it opens its own PR with). Every
+     *               name here is left unmentioned in the pane's env overlay, so the value the pane's
+     *               own (login) shell exports passes through untouched.
+     * @param known  every credential name the operator's store is known to export. Every name here
+     *               that is NOT also in {@link #allow} is overlaid with a non-secret sentinel value,
+     *               shadowing whatever the pane's login shell would otherwise export for it.
+     */
+    @JsonIgnoreProperties(ignoreUnknown = true)
+    public record MemberCredentials(String policy, List<String> allow, List<String> known) {
+
+        /** The only policy this build understands: block every {@code known} name not in {@code allow}. */
+        public static final String POLICY_DENY_BY_DEFAULT = "deny-by-default";
+
+        public MemberCredentials {
+            policy = (policy == null || policy.isBlank()) ? POLICY_DENY_BY_DEFAULT : policy.toLowerCase();
+            allow = allow == null ? List.of() : List.copyOf(allow);
+            known = known == null ? List.of() : List.copyOf(known);
+        }
+
+        /** {@link #allow} as a set, for membership checks. */
+        public Set<String> allowSet() {
+            return Set.copyOf(allow);
+        }
+
+        /** {@link #known} minus {@link #allow} — the names a spawn must shadow. */
+        public Set<String> blockedSet() {
+            Set<String> blocked = new java.util.LinkedHashSet<>(known);
+            blocked.removeAll(allowSet());
+            return blocked;
+        }
+    }
+
     /**
      * The candidate profiles an unqualified spawn of {@code role} chooses between, in definition
      * order (CB-557).
@@ -976,7 +1043,8 @@ public record BridgedConfig(
     static final Set<String> KNOWN_TOP_LEVEL_KEYS = Set.of(
             "bind", "herdrSocket", "profiles", "guard", "worktreeRoot",
             "lifecycle", "spawnReadyTimeoutMs", "spawnReadyPollMs", "broker", "primary", "fleet",
-            "leadHeartbeat", "health", "placement", "auth", "configReload", "quarantineCooldownSeconds");
+            "leadHeartbeat", "health", "placement", "auth", "configReload", "quarantineCooldownSeconds",
+            "memberCredentials");
 
     /** Load and validate config from {@code path}. */
     public static BridgedConfig load(Path path) {
@@ -990,6 +1058,7 @@ public record BridgedConfig(
             rejectUnknownKind(yaml);
             rejectUnknownAuthMode(yaml);
             rejectUnknownPlacement(yaml);
+            rejectUnknownMemberCredentialsPolicy(yaml);
             BridgedConfig cfg = YAML.readValue(yaml, BridgedConfig.class);
             // CB-606: validated here, eagerly, using PlacementPolicies.fromName as the single source
             // of truth — not lazily at first spawn (see CompositePeerLauncher's placementPolicy
@@ -1418,6 +1487,45 @@ public record BridgedConfig(
         }
     }
 
+    /** The member-credential policies this build understands — {@link MemberCredentials#policy()}'s only valid value. */
+    private static final Set<String> KNOWN_MEMBER_CREDENTIALS_POLICIES =
+            Set.of(MemberCredentials.POLICY_DENY_BY_DEFAULT);
+
+    /**
+     * Reject a {@code memberCredentials.policy} that is not {@link #KNOWN_MEMBER_CREDENTIALS_POLICIES}
+     * (CB-596), naming the value and the accepted set.
+     *
+     * <p>{@link MemberCredentials}'s compact constructor only lower-cases {@code policy} and defaults
+     * a blank one to {@link MemberCredentials#POLICY_DENY_BY_DEFAULT} — nothing rejects an actual
+     * typo like {@code deny-by-defualt}. There is only one policy today, so such a typo would
+     * currently behave identically to the real value by accident; the day a second policy exists
+     * that accident becomes a silent behavior change. Refuse it now, at config load, following the
+     * same pattern as {@link #rejectUnknownAuthMode} and {@link #rejectUnknownPlacement}.
+     *
+     * @param yaml the raw config text
+     * @throws IllegalStateException when {@code memberCredentials.policy} is a non-blank value not in
+     *                                {@link #KNOWN_MEMBER_CREDENTIALS_POLICIES} (case-insensitive)
+     */
+    static void rejectUnknownMemberCredentialsPolicy(String yaml) {
+        Map<?, ?> raw;
+        try {
+            raw = YAML.readValue(yaml, Map.class);
+        } catch (IOException | IllegalArgumentException e) {
+            return; // a malformed file is reported by the real parse, not here
+        }
+        if (raw == null || !(raw.get("memberCredentials") instanceof Map<?, ?> mc)) {
+            return;
+        }
+        if (!(mc.get("policy") instanceof String policy) || policy.isBlank()
+                || KNOWN_MEMBER_CREDENTIALS_POLICIES.contains(policy.toLowerCase())) {
+            return;
+        }
+        throw new IllegalStateException("refusing to start: memberCredentials.policy=" + policy
+                + " is not recognized — accepted values are "
+                + String.join(", ", KNOWN_MEMBER_CREDENTIALS_POLICIES.stream().sorted().toList())
+                + " (case-insensitive).");
+    }
+
     /**
      * Reject a top-level {@code placement:} policy name {@link PlacementPolicies#fromName} does not
      * recognize (CB-606), at config load rather than lazily at first spawn.
@@ -1488,9 +1596,17 @@ public record BridgedConfig(
         // config that never mentions it should still get a sane cooldown rather than a null one.
         Integer quarantineCooldown = (quarantineCooldownSeconds != null && quarantineCooldownSeconds > 0)
                 ? quarantineCooldownSeconds : DEFAULT_QUARANTINE_COOLDOWN_SECONDS;
+        // memberCredentials IS defaulted, like guard/lifecycle/auth above, so no reader ever sees a
+        // null. CB-596: an empty MemberCredentials (empty known, empty allow) blocks NOTHING — unlike
+        // guard/lifecycle, an absent block is not a safe "feature off" default here, it is a gap. It
+        // is deliberately not pre-populated with a Java-side name list (that would just reintroduce
+        // the hardcoded-list defect this record replaces); the block must be configured in
+        // bridged.yaml to protect anything. See bridged.example.yaml's memberCredentials: comment.
+        MemberCredentials mc = memberCredentials != null ? memberCredentials
+                : new MemberCredentials(null, List.of(), List.of());
         return new BridgedConfig(b, herdrSocket, profiles, g, worktreeRoot, l, timeout, pollMs,
                 broker, primary, f, leadHeartbeat, health, placementOrDefault, a, configReload,
-                quarantineCooldown);
+                quarantineCooldown, mc);
     }
 
     /**

bridged/src/main/java/dev/ltms/bridged/member/ClaudeCodeLauncher.java

@@ -83,6 +83,21 @@ public final class ClaudeCodeLauncher extends HerdrPeerLauncher {
                 fleet);
     }
 
+    /**
+     * Production constructor, plus the CB-596 {@code memberCredentials} policy supplier.
+     */
+    public ClaudeCodeLauncher(AgentControl agents, WorkspaceControl spaces, SubscriptionGuard guard,
+                              Map<String, BridgedConfig.Profile> profiles, String defaultProfile,
+                              Function<String, String> env,
+                              long spawnReadyTimeoutMs, long spawnReadyPollMs,
+                              Supplier<BridgedConfig.Fleet> fleet,
+                              Supplier<BridgedConfig.MemberCredentials> memberCredentials) {
+        this(agents, spaces, guard, profiles, defaultProfile, env,
+                spawnReadyTimeoutMs,
+                System::currentTimeMillis, () -> sleepUninterruptibly(spawnReadyPollMs),
+                fleet, memberCredentials);
+    }
+
     /**
      * Full testability constructor. Every injectable collaborator is explicit so unit tests supply
      * fakes for the clock ({@code nowMillis}) and poll-loop wait ({@code sleeper}). The
@@ -125,6 +140,39 @@ public final class ClaudeCodeLauncher extends HerdrPeerLauncher {
         this.guard = guard;
     }
 
+    /**
+     * Full testability constructor, plus the CB-596 {@code memberCredentials} policy supplier.
+     */
+    public ClaudeCodeLauncher(AgentControl agents, WorkspaceControl spaces, SubscriptionGuard guard,
+                              Map<String, BridgedConfig.Profile> profiles, String defaultProfile,
+                              Function<String, String> env,
+                              long spawnReadyTimeoutMs,
+                              LongSupplier nowMillis, Runnable sleeper,
+                              Supplier<BridgedConfig.Fleet> fleet,
+                              Supplier<BridgedConfig.MemberCredentials> memberCredentials) {
+        super(NAME_PREFIX, agents, spaces, profiles, defaultProfile, env,
+                spawnReadyTimeoutMs, nowMillis, sleeper, fleet, memberCredentials);
+        this.guard = guard;
+    }
+
+    /**
+     * Full testability constructor, plus an injectable host-env-names source for the CB-596
+     * criterion-4 gap detector. Test seam only — every production call site leaves this at the
+     * default (the real {@code System.getenv()} key set) via the constructor above.
+     */
+    public ClaudeCodeLauncher(AgentControl agents, WorkspaceControl spaces, SubscriptionGuard guard,
+                              Map<String, BridgedConfig.Profile> profiles, String defaultProfile,
+                              Function<String, String> env,
+                              long spawnReadyTimeoutMs,
+                              LongSupplier nowMillis, Runnable sleeper,
+                              Supplier<BridgedConfig.Fleet> fleet,
+                              Supplier<BridgedConfig.MemberCredentials> memberCredentials,
+                              Supplier<Set<String>> hostEnvNames) {
+        super(NAME_PREFIX, agents, spaces, profiles, defaultProfile, env,
+                spawnReadyTimeoutMs, nowMillis, sleeper, fleet, memberCredentials, hostEnvNames);
+        this.guard = guard;
+    }
+
     /**
      * {@inheritDoc}
      *

bridged/src/main/java/dev/ltms/bridged/member/HerdrPeerLauncher.java

@@ -20,6 +20,7 @@ import org.slf4j.LoggerFactory;
 import java.security.SecureRandom;
 import java.util.ArrayList;
 import java.util.Collection;
+import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -90,6 +91,27 @@ public abstract class HerdrPeerLauncher implements PeerLauncher {
      */
     private final Supplier<BridgedConfig.Fleet> fleet;
 
+    /**
+     * CB-596: the live {@code memberCredentials:} policy, read once per spawn (same hot-reload shape
+     * as {@link #fleet}). {@code null} — either the supplier itself, or what it returns — means no
+     * policy is configured and {@link #applyMemberCredentialPolicy} shadows nothing.
+     */
+    private final Supplier<BridgedConfig.MemberCredentials> memberCredentials;
+
+    /**
+     * Enumerates the daemon's own process environment variable NAMES ONLY, never values — the CB-596
+     * criterion-4 gap detector's data source (see {@link #logCredentialGap}). Injectable for tests;
+     * production always resolves to the real {@code System.getenv()} key set.
+     *
+     * <p>Deliberately the daemon's own environment, not the spawned pane's: nothing in the herdr
+     * client surface lets the daemon read back an arbitrary command's output from a pane before the
+     * peer starts in it, so there is no channel to inspect the pane's environment directly. The
+     * daemon's own process is started the same way (a login shell sourcing the same secret store —
+     * see CB-592's investigation of {@code secrets.sh}), so on a single-host deployment its env
+     * mirrors what the pane's login shell is about to export.
+     */
+    private final Supplier<Set<String>> hostEnvNames;
+
     /** The final instruction always requires a bridge reply when the bridge MCP is mounted. */
     protected static final String REPLY_CHARTER =
             "You are a spawned member in the claude-bridge fleet. Every message you receive arrives "
@@ -166,6 +188,41 @@ public abstract class HerdrPeerLauncher implements PeerLauncher {
                                 long spawnReadyTimeoutMs,
                                 LongSupplier nowMillis, Runnable sleeper,
                                 Supplier<BridgedConfig.Fleet> fleet) {
+        this(namePrefix, agents, spaces, profiles, defaultProfile, env, spawnReadyTimeoutMs,
+                nowMillis, sleeper, fleet, null);
+    }
+
+    /**
+     * As above, plus the live {@code memberCredentials} policy (CB-596).
+     *
+     * @param memberCredentials live member-credential policy, read once per spawn; {@code null} ⇒
+     *                          no policy configured, so a spawn shadows nothing. A separate
+     *                          constructor rather than a new parameter on the one above, so every
+     *                          existing call site keeps the pre-CB-596 default without an edit.
+     */
+    protected HerdrPeerLauncher(String namePrefix, AgentControl agents, WorkspaceControl spaces,
+                                Map<String, BridgedConfig.Profile> profiles, String defaultProfile,
+                                Function<String, String> env,
+                                long spawnReadyTimeoutMs,
+                                LongSupplier nowMillis, Runnable sleeper,
+                                Supplier<BridgedConfig.Fleet> fleet,
+                                Supplier<BridgedConfig.MemberCredentials> memberCredentials) {
+        this(namePrefix, agents, spaces, profiles, defaultProfile, env, spawnReadyTimeoutMs,
+                nowMillis, sleeper, fleet, memberCredentials, null);
+    }
+
+    /**
+     * As above, plus an injectable {@link #hostEnvNames} source for the CB-596 gap detector. Test
+     * seam only — every production call site leaves this {@code null} and gets the real host env.
+     */
+    protected HerdrPeerLauncher(String namePrefix, AgentControl agents, WorkspaceControl spaces,
+                                Map<String, BridgedConfig.Profile> profiles, String defaultProfile,
+                                Function<String, String> env,
+                                long spawnReadyTimeoutMs,
+                                LongSupplier nowMillis, Runnable sleeper,
+                                Supplier<BridgedConfig.Fleet> fleet,
+                                Supplier<BridgedConfig.MemberCredentials> memberCredentials,
+                                Supplier<Set<String>> hostEnvNames) {
         this.fleet = fleet;
         this.namePrefix = namePrefix;
         this.agents = agents;
@@ -176,6 +233,8 @@ public abstract class HerdrPeerLauncher implements PeerLauncher {
         this.spawnReadyTimeoutMs = spawnReadyTimeoutMs;
         this.nowMillis = nowMillis;
         this.sleeper = sleeper;
+        this.memberCredentials = memberCredentials;
+        this.hostEnvNames = hostEnvNames != null ? hostEnvNames : () -> System.getenv().keySet();
     }
 
     // --- adapter seams -------------------------------------------------------------------------
@@ -767,12 +826,13 @@ public abstract class HerdrPeerLauncher implements PeerLauncher {
     }
 
     /**
-     * CB-592: overlay value that shadows the admin {@code GITEA_ACCESS_TOKEN} a herdr pane
-     * otherwise inherits from herdr's own login-shell process environment (gitea issue #77).
-     * herdr spawns a pane from its <em>own</em> process environment and layers our map on top —
+     * CB-596: overlay value that shadows any host credential a herdr pane otherwise inherits from
+     * herdr's own login-shell process environment (gitea issue #82, superseding CB-592's single
+     * hardcoded {@code GITEA_ACCESS_TOKEN} name — see {@link #applyMemberCredentialPolicy}). herdr
+     * spawns a pane from its <em>own</em> process environment and layers our map on top —
      * {@link dev.ltms.bridged.herdr.WorkspaceControl#createTab} and {@code #splitPane} send only
      * the keys we put in that map, so any key we never mention passes straight through from
-     * herdr's own shell, admin token included.
+     * herdr's own shell, admin credentials included.
      *
      * <p>Deliberately a non-blank sentinel, not {@code ""}. Whether an empty-string overlay value
      * overrides an inherited variable or is skipped as blank could not be settled by reading this
@@ -782,21 +842,21 @@ public abstract class HerdrPeerLauncher implements PeerLauncher {
      * javadoc), and that is only demonstrated for a non-blank value, so this reuses the same,
      * proven-reliable shape rather than the unverified one.
      *
-     * <p><b>MEASURED ON A LIVE PANE, 2026-08-15: this sentinel alone does NOT hold.</b> The overlay
-     * itself works — {@code GITEA_TOKEN} is injected here, is exported by no shell file, and does
-     * reach the pane. The sentinel loses one step later. A herdr pane runs a <em>login</em> shell,
-     * {@code ~/.zprofile} sources {@code ${SHARED_ENV}/tools/secrets.sh}, and that file does a plain
-     * unconditional {@code export GITEA_ACCESS_TOKEN=...}. A login shell overwrites a value already
-     * in the environment, so the real admin token is put back over this sentinel before the member
-     * process ever starts. That defeat applies to <em>every</em> name {@code secrets.sh} exports,
-     * and no launcher-side overlay can win against it.
+     * <p><b>MEASURED ON A LIVE PANE, 2026-08-15 (CB-592): this sentinel alone does NOT hold.</b> The
+     * overlay itself works — {@code GITEA_TOKEN} is injected here, is exported by no shell file, and
+     * does reach the pane. The sentinel loses one step later. A herdr pane runs a <em>login</em>
+     * shell, {@code ~/.zprofile} sources {@code ${SHARED_ENV}/tools/secrets.sh}, and that file does a
+     * plain unconditional {@code export GITEA_ACCESS_TOKEN=...}. A login shell overwrites a value
+     * already in the environment, so the real admin token is put back over this sentinel before the
+     * member process ever starts. That defeat applies to <em>every</em> name {@code secrets.sh}
+     * exports, and no launcher-side overlay can win against it.
      *
      * <p>So this constant is not the control on its own — {@link #MEMBER_MARKER} is the other half.
      * Keeping the sentinel is still worth it: it is correct for any peer kind whose pane does not
      * start a login shell, and it makes the intent explicit at the one place every adapter passes.
      */
-    private static final String BLOCKED_GITEA_ACCESS_TOKEN =
-            "blocked-by-bridged-cb592-see-gitea-issue-77";
+    private static final String BLOCKED_CREDENTIAL_SENTINEL =
+            "blocked-by-bridged-cb596-see-gitea-issue-82";
 
     /**
      * CB-592: marks a pane as a bridged member so a shell startup file can decline to export
@@ -835,11 +895,11 @@ public abstract class HerdrPeerLauncher implements PeerLauncher {
      * dev.ltms.bridged.guard.SubscriptionGuard}, which is checked against the profile's
      * {@code baseUrl} and nothing else.
      *
-     * <p>The CB-592 shadow and marker are put in <em>last</em>, after the profile's own
-     * {@code env:}, so no profile — present or future — can restore the admin token, or hide that
-     * the pane is a member, by naming either in config. This is the one place both are applied:
-     * every {@code buildLaunch} in every adapter calls this first, so a new profile, and a peer
-     * kind not yet written, gets them for free.
+     * <p>The CB-596 credential shadow and the CB-592 marker are put in <em>last</em>, after the
+     * profile's own {@code env:}, so no profile — present or future — can restore a blocked
+     * credential, or hide that the pane is a member, by naming either in config. This is the one
+     * place both are applied: every {@code buildLaunch} in every adapter calls this first, so a new
+     * profile, and a peer kind not yet written, gets them for free.
      */
     protected Map<String, String> baseEnv(BridgedConfig.Profile cfg) {
         Map<String, String> workerEnv = new LinkedHashMap<>();
@@ -850,11 +910,70 @@ public abstract class HerdrPeerLauncher implements PeerLauncher {
         if (cfg != null && cfg.env() != null) {
             workerEnv.putAll(cfg.env());
         }
-        workerEnv.put("GITEA_ACCESS_TOKEN", BLOCKED_GITEA_ACCESS_TOKEN);
+        applyMemberCredentialPolicy(workerEnv);
         workerEnv.put(MEMBER_MARKER, "1");
         return workerEnv;
     }
 
+    /**
+     * CB-596: shadow every configured {@code memberCredentials.known} name that is not also
+     * {@code allow}-ed, replacing CB-592's single hardcoded {@code GITEA_ACCESS_TOKEN} name (gitea
+     * issue #82). An allow-listed name is deliberately left unmentioned here — see {@link
+     * #BLOCKED_CREDENTIAL_SENTINEL}'s javadoc for why an overlay entry is the only way to shadow an
+     * inherited value, which is exactly why an allowed name must get NO entry: any entry at all,
+     * blank or not, risks overriding the real value the pane needs.
+     *
+     * <p>No {@code memberCredentials} configured — the supplier is {@code null}, or it resolves to
+     * one whose {@code known} list is empty — shadows nothing. This is a real, config-driven gap
+     * (see {@link BridgedConfig.MemberCredentials}'s javadoc), not a safe default: deny-by-default
+     * only defends names the operator has actually enumerated in {@code known}.
+     */
+    private void applyMemberCredentialPolicy(Map<String, String> workerEnv) {
+        BridgedConfig.MemberCredentials creds = memberCredentials == null ? null : memberCredentials.get();
+        if (creds == null) {
+            return;
+        }
+        for (String name : creds.blockedSet()) {
+            workerEnv.put(name, BLOCKED_CREDENTIAL_SENTINEL);
+        }
+        logCredentialGap(creds);
+    }
+
+    /** Credential-shaped env var name heuristic for {@link #logCredentialGap} — case-insensitive. */
+    private static final Pattern CREDENTIAL_SHAPED_NAME =
+            Pattern.compile("(?i).*(TOKEN|SECRET|_KEY|APIKEY|PASSWORD|CREDENTIAL|AUTH).*");
+
+    /** Guards {@link #logCredentialGap} to one WARN per launcher instance, not one per spawn. */
+    private final AtomicBoolean credentialGapLogged = new AtomicBoolean();
+
+    /**
+     * CB-596 criterion 4: a credential-shaped host env var name on neither {@code known} nor
+     * {@code allow} is not silently allowed — it is reported. {@link #hostEnvNames} enumerates the
+     * daemon's own environment (see that field's javadoc for why the daemon's env is read rather
+     * than the spawned pane's, which the daemon has no channel to inspect at spawn time); this logs
+     * every such NAME, at WARN, at most once per launcher instance — never a value, a prefix of a
+     * value, or a hash of a value, so the log itself cannot leak anything.
+     */
+    private void logCredentialGap(BridgedConfig.MemberCredentials creds) {
+        Set<String> covered = new HashSet<>(creds.known());
+        covered.addAll(creds.allow());
+        List<String> gap = hostEnvNames.get().stream()
+                .filter(name -> CREDENTIAL_SHAPED_NAME.matcher(name).matches())
+                .filter(name -> !covered.contains(name))
+                .sorted()
+                .toList();
+        if (gap.isEmpty()) {
+            return;
+        }
+        if (credentialGapLogged.compareAndSet(false, true)) {
+            log.warn("memberCredentials gap: {} credential-shaped env var name(s) are on neither "
+                            + "known: nor allow: — every member pane inherits them UNBLOCKED — {}. "
+                            + "Add each to memberCredentials.known (blocked by default) or .allow "
+                            + "(if a member legitimately needs it).",
+                    gap.size(), gap);
+        }
+    }
+
     /** Defensive copy of {@code argv} plus room to append launch flags. */
     protected static List<String> mutableArgv(List<String> argv) {
         return new ArrayList<>(argv);

bridged/src/main/java/dev/ltms/bridged/member/OpenCodeLauncher.java

@@ -104,6 +104,20 @@ public final class OpenCodeLauncher extends HerdrPeerLauncher {
                 defaultConfigRoot(), defaultDiscoveryRoot(), fleet);
     }
 
+    /**
+     * Production constructor, plus the CB-596 {@code memberCredentials} policy supplier.
+     */
+    public OpenCodeLauncher(AgentControl agents, WorkspaceControl spaces,
+                            Map<String, BridgedConfig.Profile> profiles, String defaultProfile,
+                            Function<String, String> env,
+                            long spawnReadyTimeoutMs, long spawnReadyPollMs,
+                            Supplier<BridgedConfig.Fleet> fleet,
+                            Supplier<BridgedConfig.MemberCredentials> memberCredentials) {
+        this(agents, spaces, profiles, defaultProfile, env, spawnReadyTimeoutMs,
+                System::currentTimeMillis, () -> sleepUninterruptibly(spawnReadyPollMs),
+                defaultConfigRoot(), defaultDiscoveryRoot(), fleet, memberCredentials);
+    }
+
     /**
      * Full testability constructor. Every injectable collaborator is explicit so unit tests supply a
      * fake clock ({@code nowMillis}), poll-loop wait ({@code sleeper}), and a temp {@code configRoot}
@@ -151,6 +165,23 @@ public final class OpenCodeLauncher extends HerdrPeerLauncher {
         this.discovery = new OpenCodeSessionDiscovery(discoveryRoot);
     }
 
+    /**
+     * Full testability constructor, plus the CB-596 {@code memberCredentials} policy supplier.
+     */
+    public OpenCodeLauncher(AgentControl agents, WorkspaceControl spaces,
+                            Map<String, BridgedConfig.Profile> profiles, String defaultProfile,
+                            Function<String, String> env,
+                            long spawnReadyTimeoutMs,
+                            LongSupplier nowMillis, Runnable sleeper,
+                            Path configRoot, Path discoveryRoot,
+                            Supplier<BridgedConfig.Fleet> fleet,
+                            Supplier<BridgedConfig.MemberCredentials> memberCredentials) {
+        super(NAME_PREFIX, agents, spaces, profiles, defaultProfile, env,
+                spawnReadyTimeoutMs, nowMillis, sleeper, fleet, memberCredentials);
+        this.configRoot = configRoot;
+        this.discovery = new OpenCodeSessionDiscovery(discoveryRoot);
+    }
+
     private static Path defaultConfigRoot() {
         return Path.of(System.getProperty("java.io.tmpdir"));
     }