Pin declared Anthropic MPS targets by family, like Bedrock (#376)

`ucode claude --provider <mps>` sends whatever model string Claude Code's alias
resolves to, and the gateway's direct-MPS path exact-matches that against the
service's declared targets (then forwards it verbatim). For a Bedrock service
ucode already pins ANTHROPIC_DEFAULT_*_MODEL to the service's target slugs, but
for an API-key Anthropic service it pinned nothing and trusted Claude Code's
canonical names to match — which they may not: a custom/dated target name, or an
enterprise managed-settings pin like `system.ai.claude-haiku-4-5`, yields a 403
"not in the allowed models list".

resolve_provider_models now derives the family->target map for a non-relayed
Anthropic service too (map_claude_family_models already handles canonical ids),
so the client sends exactly the ids the MPS declares. Bedrock is unchanged;
relayed Claude Max/Enterprise stays exempt (model selection is off server-side).

Co-authored-by: Isaac <no-reply@databricks.com>

Author: masonc08

src/ucode/agents/__init__.py

@@ -18,7 +18,6 @@
 
 from ucode.config_io import ToolSpec
 from ucode.databricks import (
-    BEDROCK_PROVIDER_TYPES,
     get_databricks_token,
     install_ai_tools,
     install_databricks_cli,
@@ -296,17 +295,18 @@ def resolve_provider_models(
     """Validate ``provider`` for ``tool`` and return the model ids to pin.
 
     Returns ``(provider_models, error, relayed)``. ``provider_models`` is a ``{family: model_id}``
-    dict for a Bedrock-backed claude service (whose provider-side ids must be pinned explicitly), or
-    None for an Anthropic/canonical service or when ``provider`` is None. ``relayed`` is True for a
-    credential-less Anthropic subscription relay, which the launch path wires with the relayed
-    overlay + refresh proxy. A non-None ``error`` means the provider is invalid for the tool and the
-    caller should not launch.
-
-    This is the *developer-configured* path (``ucode configure`` then ``ucode claude``) and its
-    behaviour is deliberately unchanged: only Bedrock pins, re-derived from the service's live
-    targets. The *managed* path pins from the admin's authored manifest slots instead — see
-    ``managed_resolve.managed_provider_family_models`` and its launch call site — so an admin's
-    chosen versions win rather than being re-derived here.
+    dict re-derived from the service's live targets for a non-relayed claude service — both Bedrock
+    (provider-side slugs) and API-key Anthropic (canonical ids) — so the client sends exactly the ids
+    the MPS allows rather than Claude Code's defaults, which may not match the declared targets. It is
+    None when ``provider`` is None, for a relayed subscription (see below), or for a non-Claude (e.g.
+    codex) service. ``relayed`` is True for a credential-less Anthropic subscription relay, which the
+    launch path wires with the relayed overlay + refresh proxy. A non-None ``error`` means the
+    provider is invalid for the tool and the caller should not launch.
+
+    This is the *developer-configured* path (``ucode configure`` then ``ucode claude``). The *managed*
+    path pins from the admin's authored manifest slots instead — see
+    ``managed_resolve.managed_provider_family_models`` and its launch call site — so an admin's chosen
+    versions win rather than being re-derived here.
     """
     if not provider:
         return None, None, False
@@ -315,9 +315,11 @@ def resolve_provider_models(
     if error or service is None:
         return None, error, False
     relayed = bool(service.get("relayed"))
-    if service["provider_type"] in BEDROCK_PROVIDER_TYPES:
-        return map_claude_family_models(service.get("targets") or []), None, relayed
-    return None, None, relayed
+    # Relayed (Claude Max/Enterprise subscription) is exempt: the gateway disables
+    # model selection server-side for that tier, so there's nothing to reconcile.
+    if relayed:
+        return None, None, relayed
+    return map_claude_family_models(service.get("targets") or []) or None, None, relayed
 
 
 def configure_tool(

tests/test_agents_init.py

@@ -278,10 +278,10 @@ def test_none_provider_returns_none(self):
         models, error, relayed = agents_mod.resolve_provider_models("claude", self._STATE, None)
         assert (models, error, relayed) == (None, None, False)
 
-    def test_anthropic_returns_no_models(self, monkeypatch):
-        # The developer-configured path is deliberately unchanged: an Anthropic service pins nothing
-        # even with explicit targets — Claude Code's canonical names route fine. (The managed path
-        # pins from authored manifest slots instead; see managed_resolve.)
+    def test_anthropic_pins_family_targets(self, monkeypatch):
+        # An API-key Anthropic service pins its declared targets by family, so the client sends
+        # exactly the ids the MPS allows rather than Claude Code's canonical names (which may not
+        # match the declared targets → gateway 403 "not in the allowed models list").
         self._patch(
             monkeypatch,
             {"provider_type": "anthropic", "targets": ["claude-sonnet-5", "claude-haiku-4-5"]},
@@ -291,9 +291,18 @@ def test_anthropic_returns_no_models(self, monkeypatch):
             "claude", self._STATE, "main.a.svc"
         )
         assert error is None
-        assert models is None
+        assert models == {"sonnet": "claude-sonnet-5", "haiku": "claude-haiku-4-5"}
         assert relayed is False
 
+    def test_anthropic_with_no_claude_targets_pins_nothing(self, monkeypatch):
+        # No Claude-family targets → no pins (the `or None` fallback), leaving Claude Code's
+        # defaults in place rather than an empty dict.
+        self._patch(monkeypatch, {"provider_type": "anthropic", "targets": []}, None)
+        models, error, relayed = agents_mod.resolve_provider_models(
+            "claude", self._STATE, "main.a.empty"
+        )
+        assert (models, error, relayed) == (None, None, False)
+
     def test_relayed_anthropic_flagged(self, monkeypatch):
         self._patch(
             monkeypatch, {"provider_type": "anthropic", "targets": [], "relayed": True}, None