feat: add Skill Pydantic schemas

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/app/schemas/skill.py

@@ -0,0 +1,48 @@
+from pydantic import BaseModel
+from typing import Optional
+
+
+class SkillCreate(BaseModel):
+    name: str
+    description: Optional[str] = None
+    instructions: str
+    agent_type: str  # master/planner/executor/librarian/analyst
+    tools: list[str] = []
+    required_context: list[str] = []
+    output_format: Optional[str] = None
+    visibility: str = "private"
+    team_id: Optional[str] = None
+    is_active: bool = True
+
+
+class SkillUpdate(BaseModel):
+    # All fields Optional
+    name: Optional[str] = None
+    description: Optional[str] = None
+    instructions: Optional[str] = None
+    agent_type: Optional[str] = None
+    tools: Optional[list[str]] = None
+    required_context: Optional[list[str]] = None
+    output_format: Optional[str] = None
+    visibility: Optional[str] = None
+    team_id: Optional[str] = None
+    is_active: Optional[bool] = None
+
+
+class SkillOut(BaseModel):
+    id: str
+    name: str
+    description: Optional[str]
+    instructions: str
+    agent_type: str
+    tools: list[str]
+    required_context: list[str]
+    output_format: Optional[str]
+    visibility: str
+    team_id: Optional[str]
+    is_active: bool
+    owner_id: str
+    created_at: str
+    updated_at: str
+
+    model_config = {"from_attributes": True}