fix(deepseek): subclass ProviderProfile so reasoning_effort + thinking reach the API

plugins/model-providers/deepseek/__init__.py

@@ -1,18 +1,66 @@
 """DeepSeek provider profile."""
 
+from typing import Any
+
 from providers import register_provider
 from providers.base import ProviderProfile
 
-deepseek = ProviderProfile(
+
+_EFFORT_MAP = {
+    "minimal": "low",
+    "low": "low",
+    "medium": "medium",
+    "high": "high",
+    "xhigh": "xhigh",
+}
+
+
+class DeepSeekProfile(ProviderProfile):
+    """DeepSeek native API profile.
+
+    Emits ``reasoning_effort`` + ``extra_body.thinking`` per the DeepSeek
+    thinking-mode contract (api-docs.deepseek.com/guides/thinking_mode).
+    The hermes ``minimal`` effort is remapped to ``low`` because the
+    DeepSeek API rejects ``minimal``. When thinking is disabled,
+    ``reasoning_effort`` is omitted to avoid the API's documented 400
+    conflict ("thinking options type cannot be disabled when
+    reasoning_effort is set").
+    """
+
+    def build_api_kwargs_extras(
+        self,
+        *,
+        reasoning_config: dict | None = None,
+        **context: Any,
+    ) -> tuple[dict[str, Any], dict[str, Any]]:
+        if not reasoning_config:
+            return {}, {}
+
+        thinking_enabled = reasoning_config.get("enabled", True) is not False
+        extra_body: dict[str, Any] = {
+            "thinking": {
+                "type": "enabled" if thinking_enabled else "disabled",
+            }
+        }
+
+        top_level: dict[str, Any] = {}
+        if thinking_enabled:
+            raw_effort = (reasoning_config.get("effort") or "high").strip().lower()
+            top_level["reasoning_effort"] = _EFFORT_MAP.get(raw_effort, "high")
+
+        return extra_body, top_level
+
+
+deepseek = DeepSeekProfile(
     name="deepseek",
-    aliases=("deepseek-chat",),
+    aliases=(),
     env_vars=("DEEPSEEK_API_KEY",),
     display_name="DeepSeek",
     description="DeepSeek — native DeepSeek API",
     signup_url="https://platform.deepseek.com/",
     fallback_models=(
-        "deepseek-chat",
-        "deepseek-reasoner",
+        "deepseek-v4-pro",
+        "deepseek-v4-flash",
     ),
     base_url="https://api.deepseek.com/v1",
 )