diff --git a/hub-server/.env.example b/hub-server/.env.example
index e9b80d291..1c1ebf028 100644
--- a/hub-server/.env.example
+++ b/hub-server/.env.example
@@ -41,7 +41,7 @@ AGENTHUB_AGENT_TEAM_MAX_TEAM_RUN_BUDGET_USAGE_PCT=95
 #    d. Save the returned client_id and client_secret below
 # 3. If TokenDance ID is NOT running, use the seed SQL:
 #    sqlite3 ../tokendance-id/data/tokendance.db < scripts/seed-tokendance-client.sql
-#    The seed uses client_id=agenthub-desktop with secret=agenthub-dev-secret-change-me
+#    The seed uses client_id=agenthub-desktop; copy the generated secret from the setup script output.
 
 AGENTHUB_TOKENDANCE_ID_ISSUER_URL=http://localhost:3000
 # AGENTHUB_TOKENDANCE_ID_JWKS_URI=           ← auto-derived from issuer_url + /oidc/jwks
diff --git a/hub-server/internal/config/config_test.go b/hub-server/internal/config/config_test.go
index 9dc82a07d..1c1fb7cc7 100644
--- a/hub-server/internal/config/config_test.go
+++ b/hub-server/internal/config/config_test.go
@@ -735,6 +735,72 @@ func TestValidateTokenDanceIDRequiresRedirectURI(t *testing.T) {
 	}
 }
 
+func TestValidateTokenDanceIDRejectsShortClientSecret(t *testing.T) {
+	cfg := &Config{
+		DB: DBConfig{
+			Host:            "localhost",
+			Port:            5432,
+			User:            "agenthub",
+			Name:            "agenthub",
+			MaxOpenConns:    2,
+			MaxIdleConns:    1,
+			ConnMaxLifetime: 30 * time.Minute,
+			ConnMaxIdleTime: 5 * time.Minute,
+		},
+		Redis: RedisConfig{Host: "localhost", Port: 6379},
+		JWT: JWTConfig{
+			Secret: "strong-agenthub-secret-padded-to-minimum-32-chars..",
+		},
+		TokenDanceID: TokenDanceIDConfig{
+			IssuerURL:    "https://id.example",
+			ClientID:     "agenthub-client",
+			ClientSecret: "short-but-present-secret",
+			RedirectURI:  "http://127.0.0.1/callback",
+		},
+	}
+
+	err := cfg.Validate()
+	if err == nil {
+		t.Fatal("expected short TokenDance ID client secret to be rejected")
+	}
+	if !strings.Contains(err.Error(), "tokendance_id.client_secret too short") {
+		t.Fatalf("Validate() error = %q, want tokendance_id.client_secret too short", err.Error())
+	}
+}
+
+func TestValidateTokenDanceIDRejectsSeedSecret(t *testing.T) {
+	cfg := &Config{
+		DB: DBConfig{
+			Host:            "localhost",
+			Port:            5432,
+			User:            "agenthub",
+			Name:            "agenthub",
+			MaxOpenConns:    2,
+			MaxIdleConns:    1,
+			ConnMaxLifetime: 30 * time.Minute,
+			ConnMaxIdleTime: 5 * time.Minute,
+		},
+		Redis: RedisConfig{Host: "localhost", Port: 6379},
+		JWT: JWTConfig{
+			Secret: "strong-agenthub-secret-padded-to-minimum-32-chars..",
+		},
+		TokenDanceID: TokenDanceIDConfig{
+			IssuerURL:    "https://id.example",
+			ClientID:     "agenthub-client",
+			ClientSecret: weakSecretPrefixes[len(weakSecretPrefixes)-1] + strings.Repeat("x", 32),
+			RedirectURI:  "http://127.0.0.1/callback",
+		},
+	}
+
+	err := cfg.Validate()
+	if err == nil {
+		t.Fatal("expected seed SQL TokenDance ID client secret to be rejected")
+	}
+	if !strings.Contains(err.Error(), "tokendance_id.client_secret must be a strong") {
+		t.Fatalf("Validate() error = %q, want tokendance_id.client_secret must be a strong", err.Error())
+	}
+}
+
 // --- DSN / Addr edge cases ---
 
 func TestDBConfigDSNZeroValues(t *testing.T) {
diff --git a/hub-server/internal/config/config_validate.go b/hub-server/internal/config/config_validate.go
index 9603fb728..4b8471d74 100644
--- a/hub-server/internal/config/config_validate.go
+++ b/hub-server/internal/config/config_validate.go
@@ -84,6 +84,7 @@ var knownHardcodedSecrets = []string{
 	"password",
 	"1234567890123456",
 	"aaaaaaaaaaaaaaaa",
+	"agenthub-dev-secret-change-me",
 }
 
 // weakSecretPrefixes blocks the publicly-documented placeholder families.
@@ -97,9 +98,12 @@ var knownHardcodedSecrets = []string{
 //     family (e.g. change-me-production-min-length-32-chars, 41 chars).
 //     Both PG_PASSWORD and JWT_SECRET in .env.example used this prefix; the
 //     JWT variant was long enough to pass the length gate before this entry.
+//   - "agenthub-dev-secret": the seed SQL OIDC client_secret family
+//     (agenthub-dev-secret-change-me and derivatives).
 var weakSecretPrefixes = []string{
 	"dev-secret-change-in-production",
 	"change-me-production",
+	"agenthub-dev-secret",
 }
 
 // isKnownWeakSecret reports whether the given secret is a hardcoded default
@@ -165,6 +169,17 @@ func (c *Config) validateTokenDanceID() error {
 		if c.TokenDanceID.RedirectURI == "" {
 			return fmt.Errorf("tokendance_id.redirect_uri is required when tokendance_id.client_id is set")
 		}
+		// OIDC client_secret must meet the same strength bar as JWT secrets:
+		// 32-char minimum and no known hardcoded/placeholder values. The
+		// seed SQL default (agenthub-dev-secret-change-me) and the
+		// .env.example documented placeholders must be rejected so an
+		// operator cannot accidentally run production with the seed value.
+		if len(c.TokenDanceID.ClientSecret) < 32 {
+			return fmt.Errorf("tokendance_id.client_secret too short: minimum 32 characters required (got %d)", len(c.TokenDanceID.ClientSecret))
+		}
+		if isKnownWeakSecret(c.TokenDanceID.ClientSecret) {
+			return errors.New("tokendance_id.client_secret must be a strong, non-default value; the seed SQL default and documented dev placeholders are rejected")
+		}
 	}
 	return nil
 }