diff --git a/state-hub/custodian_cli.py b/state-hub/custodian_cli.py
index 408ad72..962edba 100644
--- a/state-hub/custodian_cli.py
+++ b/state-hub/custodian_cli.py
@@ -26,12 +26,6 @@ API_BASE = os.environ.get("API_BASE", "http://127.0.0.1:8000")
 TEMPLATE = STATE_HUB_DIR / "scripts" / "project_claude_md.template"
 PATCH_CWD = STATE_HUB_DIR / "scripts" / "patch_mcp_cwd.py"
 
-VALID_DOMAINS = [
-    "custodian", "railiance", "markitect",
-    "coulomb_social", "personhood", "foerster_capabilities",
-]
-
-
 # ── Helpers ────────────────────────────────────────────────────────────────────
 
 def _api_get(path: str) -> object:
@@ -88,6 +82,7 @@ def cmd_register(args: argparse.Namespace) -> None:
 
     # ── Step 2: Domain ─────────────────────────────────────────────────────────
     domain = args.domain
+    valid_domains = [d["slug"] for d in _api_get("/domains/?status=active")]
     if not domain:
         print("==> Auto-detecting domain from project charter ...")
         domain = _detect_domain(project_path)
@@ -95,17 +90,17 @@ def cmd_register(args: argparse.Namespace) -> None:
             print(f"    Detected: {domain}")
         else:
             print(f"ERROR: Could not auto-detect domain. Pass --domain explicitly.")
-            print(f"  Valid: {', '.join(VALID_DOMAINS)}")
+            print(f"  Valid: {', '.join(valid_domains)}")
             sys.exit(1)
 
-    if domain not in VALID_DOMAINS:
-        print(f"ERROR: Unknown domain '{domain}'. Valid: {', '.join(VALID_DOMAINS)}")
+    if domain not in valid_domains:
+        print(f"ERROR: Unknown domain '{domain}'. Valid: {', '.join(valid_domains)}")
         sys.exit(1)
 
     # ── Step 3: Topic ID lookup ────────────────────────────────────────────────
     print(f"==> Looking up topic for domain '{domain}' ...")
     topics = _api_get("/topics/?status=active")
-    match = next((t for t in topics if t.get("domain") == domain), None)
+    match = next((t for t in topics if t.get("domain_slug") == domain), None)
     if not match:
         print(f"ERROR: No active topic found for domain '{domain}'.")
         sys.exit(1)
@@ -167,7 +162,7 @@ def cmd_create_workstream(args: argparse.Namespace) -> None:
 
     # Resolve topic_id from domain
     topics = _api_get("/topics/?status=active")
-    match = next((t for t in topics if t.get("domain") == args.domain), None)
+    match = next((t for t in topics if t.get("domain_slug") == args.domain), None)
     if not match:
         print(f"ERROR: No active topic for domain '{args.domain}'.")
         sys.exit(1)
@@ -274,9 +269,8 @@ def main() -> None:
     reg = sub.add_parser("register-project", help="Register a project with the State Hub")
     reg.add_argument(
         "--domain",
-        choices=VALID_DOMAINS,
         default=None,
-        help="Project domain (auto-detected from charter if omitted)",
+        help="Project domain slug (auto-detected from charter if omitted)",
     )
     reg.add_argument(
         "--path",
@@ -286,7 +280,7 @@ def main() -> None:
 
     # create-workstream
     cws = sub.add_parser("create-workstream", help="Create a workstream under a domain topic")
-    cws.add_argument("--domain", choices=VALID_DOMAINS, required=True, help="Domain to create the workstream under")
+    cws.add_argument("--domain", required=True, help="Domain slug to create the workstream under")
     cws.add_argument("--title", required=True, help="Workstream title")
     cws.add_argument("--slug", default=None, help="URL slug (auto-generated from title if omitted)")
     cws.add_argument("--owner", default=None, help="Owner name")