diff --git a/trustgraph-base/trustgraph/messaging/translators/iam.py b/trustgraph-base/trustgraph/messaging/translators/iam.py
index 1d7bf21c..9e16d3df 100644
--- a/trustgraph-base/trustgraph/messaging/translators/iam.py
+++ b/trustgraph-base/trustgraph/messaging/translators/iam.py
@@ -5,6 +5,7 @@ from ...schema import (
     UserInput, UserRecord,
     WorkspaceInput, WorkspaceRecord,
     ApiKeyInput, ApiKeyRecord,
+    GroupInput, GrantInput,
 )
 from .base import MessageTranslator
 
@@ -43,6 +44,25 @@ def _api_key_input_from_dict(d):
     )
 
 
+def _group_input_from_dict(d):
+    if d is None:
+        return None
+    return GroupInput(
+        name=d.get("name", ""),
+        description=d.get("description", ""),
+        enabled=d.get("enabled", True),
+    )
+
+
+def _grant_input_from_dict(d):
+    if d is None:
+        return None
+    return GrantInput(
+        capability=d.get("capability", ""),
+        workspace=d.get("workspace", ""),
+    )
+
+
 def _user_record_to_dict(r):
     if r is None:
         return None
@@ -102,6 +122,15 @@ class IamRequestTranslator(MessageTranslator):
                 data.get("workspace_record")
             ),
             key=_api_key_input_from_dict(data.get("key")),
+            group_id=data.get("group_id", ""),
+            member_type=data.get("member_type", ""),
+            member_id=data.get("member_id", ""),
+            group=_group_input_from_dict(data.get("group")),
+            grant=_grant_input_from_dict(data.get("grant")),
+            capability=data.get("capability", ""),
+            resource_json=data.get("resource_json", ""),
+            parameters_json=data.get("parameters_json", ""),
+            authorise_checks=data.get("authorise_checks", ""),
         )
 
     def encode(self, obj: IamRequest) -> Dict[str, Any]:
@@ -109,6 +138,9 @@ class IamRequestTranslator(MessageTranslator):
         for fname in (
                 "workspace", "actor", "user_id", "username", "key_id",
                 "api_key", "password", "new_password",
+                "group_id", "member_type", "member_id",
+                "capability", "resource_json", "parameters_json",
+                "authorise_checks",
         ):
             v = getattr(obj, fname, "")
             if v:
@@ -135,6 +167,17 @@ class IamRequestTranslator(MessageTranslator):
                 "name": obj.key.name,
                 "expires": obj.key.expires,
             }
+        if obj.group is not None:
+            result["group"] = {
+                "name": obj.group.name,
+                "description": obj.group.description,
+                "enabled": obj.group.enabled,
+            }
+        if obj.grant is not None:
+            result["grant"] = {
+                "capability": obj.grant.capability,
+                "workspace": obj.grant.workspace,
+            }
         return result
 
 
@@ -190,6 +233,23 @@ class IamResponseTranslator(MessageTranslator):
         # setup, so it can't be dropped by a truthy-only filter.
         result["bootstrap_available"] = bool(obj.bootstrap_available)
 
+        # authorise / authorise-many outputs.
+        if obj.decision_allow:
+            result["decision_allow"] = obj.decision_allow
+        if obj.decision_ttl_seconds:
+            result["decision_ttl_seconds"] = obj.decision_ttl_seconds
+        if obj.decisions_json:
+            result["decisions_json"] = obj.decisions_json
+
+        # Enterprise IAM outputs.
+        for fname in (
+                "group_json", "groups_json", "members_json",
+                "grants_json", "effective_permissions_json",
+        ):
+            v = getattr(obj, fname, "")
+            if v:
+                result[fname] = v
+
         return result
 
     def encode_with_completion(
diff --git a/trustgraph-base/trustgraph/schema/services/iam.py b/trustgraph-base/trustgraph/schema/services/iam.py
index 797d6203..6a657d62 100644
--- a/trustgraph-base/trustgraph/schema/services/iam.py
+++ b/trustgraph-base/trustgraph/schema/services/iam.py
@@ -74,6 +74,21 @@ class ApiKeyRecord:
     last_used: str = ""
 
 
+# ---- Enterprise IAM types (additive) ----
+
+@dataclass
+class GroupInput:
+    name: str = ""
+    description: str = ""
+    enabled: bool = True
+
+
+@dataclass
+class GrantInput:
+    capability: str = ""
+    workspace: str = ""
+
+
 @dataclass
 class IamRequest:
     operation: str = ""
@@ -99,6 +114,13 @@ class IamRequest:
     workspace_record: WorkspaceInput | None = None
     key: ApiKeyInput | None = None
 
+    # ---- Enterprise IAM inputs (additive) ----
+    group_id: str = ""
+    member_type: str = ""
+    member_id: str = ""
+    group: GroupInput | None = None
+    grant: GrantInput | None = None
+
     # ---- authorise / authorise-many inputs ----
     # Capability string from the vocabulary in capabilities.md.
     capability: str = ""
@@ -164,6 +186,14 @@ class IamResponse:
     # authorise_checks.
     decisions_json: str = ""
 
+    # ---- Enterprise IAM outputs (additive) ----
+    # JSON-serialised payloads for enterprise group/grant operations.
+    group_json: str = ""
+    groups_json: str = ""
+    members_json: str = ""
+    grants_json: str = ""
+    effective_permissions_json: str = ""
+
     error: Error | None = None
 
 
diff --git a/trustgraph-flow/trustgraph/gateway/registry.py b/trustgraph-flow/trustgraph/gateway/registry.py
index ca235315..4fba7920 100644
--- a/trustgraph-flow/trustgraph/gateway/registry.py
+++ b/trustgraph-flow/trustgraph/gateway/registry.py
@@ -506,18 +506,18 @@ _FLOW_SERVICES = {
     "text-completion": "llm",
     "prompt": "llm",
     "mcp-tool": "mcp",
-    "graph-rag": "graph:read",
-    "document-rag": "documents:read",
+    "graph-rag": "graph-rag:read",
+    "document-rag": "document-rag:read",
     "embeddings": "embeddings",
-    "graph-embeddings": "graph:read",
-    "document-embeddings": "documents:read",
-    "triples": "graph:read",
+    "graph-embeddings": "graph-embeddings:read",
+    "document-embeddings": "document-embeddings:read",
+    "triples": "triples:read",
     "rows": "rows:read",
-    "nlp-query": "rows:read",
-    "structured-query": "rows:read",
-    "structured-diag": "rows:read",
-    "row-embeddings": "rows:read",
-    "sparql": "graph:read",
+    "nlp-query": "nlp-query:read",
+    "structured-query": "structured-query:read",
+    "structured-diag": "structured-query:read",
+    "row-embeddings": "row-embeddings:read",
+    "sparql": "sparql:read",
 }
 for _kind, _cap in _FLOW_SERVICES.items():
     _register_flow_kind("flow-service", _kind, _cap)
@@ -525,10 +525,10 @@ for _kind, _cap in _FLOW_SERVICES.items():
 
 # Streaming import socket endpoints.
 _FLOW_IMPORTS = {
-    "triples": "graph:write",
-    "graph-embeddings": "graph:write",
-    "document-embeddings": "documents:write",
-    "entity-contexts": "documents:write",
+    "triples": "triples:write",
+    "graph-embeddings": "graph-embeddings:write",
+    "document-embeddings": "document-embeddings:write",
+    "entity-contexts": "entity-contexts:write",
     "rows": "rows:write",
 }
 for _kind, _cap in _FLOW_IMPORTS.items():
@@ -537,10 +537,35 @@ for _kind, _cap in _FLOW_IMPORTS.items():
 
 # Streaming export socket endpoints.
 _FLOW_EXPORTS = {
-    "triples": "graph:read",
-    "graph-embeddings": "graph:read",
-    "document-embeddings": "documents:read",
-    "entity-contexts": "documents:read",
+    "triples": "triples:read",
+    "graph-embeddings": "graph-embeddings:read",
+    "document-embeddings": "document-embeddings:read",
+    "entity-contexts": "entity-contexts:read",
 }
 for _kind, _cap in _FLOW_EXPORTS.items():
     _register_flow_kind("flow-export", _kind, _cap)
+
+
+# ---------------------------------------------------------------------------
+# Enterprise IAM operations.
+#
+# These are additive — they register alongside the OSS IAM operations.
+# When the OSS regime receives an unknown operation it returns an error;
+# when the enterprise regime is running, it handles them.
+# ---------------------------------------------------------------------------
+
+for _op in (
+    "create-group", "get-group", "list-groups",
+    "update-group", "delete-group",
+    "add-group-member", "remove-group-member", "list-group-members",
+    "add-group-grant", "remove-group-grant", "list-group-grants",
+    "add-user-grant", "remove-user-grant", "list-user-grants",
+    "resolve-effective-permissions",
+):
+    register(Operation(
+        name=_op,
+        capability="iam:admin",
+        resource_level=ResourceLevel.SYSTEM,
+        extract_resource=_empty_resource,
+        extract_parameters=_no_parameters,
+    ))
diff --git a/trustgraph-flow/trustgraph/iam/service/iam.py b/trustgraph-flow/trustgraph/iam/service/iam.py
index 5f86e688..037b6bb0 100644
--- a/trustgraph-flow/trustgraph/iam/service/iam.py
+++ b/trustgraph-flow/trustgraph/iam/service/iam.py
@@ -58,8 +58,18 @@ AUTHZ_CACHE_TTL_SECONDS = 60
 _READER_CAPS = {
     "agent",
     "graph:read",
+    "triples:read",
+    "sparql:read",
+    "graph-rag:read",
+    "graph-embeddings:read",
     "documents:read",
+    "document-rag:read",
+    "document-embeddings:read",
+    "entity-contexts:read",
     "rows:read",
+    "nlp-query:read",
+    "structured-query:read",
+    "row-embeddings:read",
     "llm",
     "embeddings",
     "mcp",
@@ -73,6 +83,10 @@ _READER_CAPS = {
 
 _WRITER_CAPS = _READER_CAPS | {
     "graph:write",
+    "triples:write",
+    "graph-embeddings:write",
+    "document-embeddings:write",
+    "entity-contexts:write",
     "documents:write",
     "rows:write",
     "collections:write",