diff --git a/core/team_runner.py b/core/team_runner.py
index 78e3fec..7d59914 100644
--- a/core/team_runner.py
+++ b/core/team_runner.py
@@ -58,7 +58,7 @@ _TIER_CAPABILITIES: dict[int, str] = {
     1: "reasoning-heavy",
     2: "reasoning-heavy",
     3: "capable",
-    4: "capable",
+    4: "fast-cheap",
     5: "fast-cheap",
 }
 
@@ -71,18 +71,16 @@ _TIER_CAPABILITIES: dict[int, str] = {
 # enabling third-party adapters without touching this file.
 # ---------------------------------------------------------------------------
 
-_LLM_ADAPTERS: dict[str, str] = {
-    "anthropic": "adapters.llm.anthropic:AnthropicAdapter",
-}
-_VCS_ADAPTERS: dict[str, str] = {
-    "github": "adapters.vcs.github:GitHubAdapter",
-}
-_NOTIFY_ADAPTERS: dict[str, str] = {
-    "openclaw": "adapters.notify.openclaw:OpenClawNotifyAdapter",
-}
-_RUNTIME_ADAPTERS: dict[str, str] = {
-    "openclaw": "adapters.runtime.openclaw:OpenClawRuntimeAdapter",
-    "claude_code": "adapters.runtime.claude_code:ClaudeCodeRuntimeAdapter",
+# Adapter registries are loaded from team.yaml at runtime (adapter_registry section).
+# Fallback built-ins are used only if team.yaml doesn't define adapter_registry.
+_BUILTIN_ADAPTER_REGISTRY: dict[str, dict[str, str]] = {
+    "llm": {"anthropic": "adapters.llm.anthropic:AnthropicAdapter"},
+    "vcs": {"github": "adapters.vcs.github:GitHubAdapter"},
+    "notify": {"openclaw": "adapters.notify.openclaw:OpenClawNotifyAdapter"},
+    "runtime": {
+        "openclaw": "adapters.runtime.openclaw:OpenClawRuntimeAdapter",
+        "claude_code": "adapters.runtime.claude_code:ClaudeCodeRuntimeAdapter",
+    },
 }