feat: support skills

agent/skills/types.py

@@ -0,0 +1,74 @@
+"""
+Type definitions for skills system.
+"""
+
+from typing import Dict, List, Optional, Any
+from dataclasses import dataclass, field
+
+
+@dataclass
+class SkillInstallSpec:
+    """Specification for installing skill dependencies."""
+    kind: str  # brew, pip, npm, download, etc.
+    id: Optional[str] = None
+    label: Optional[str] = None
+    bins: List[str] = field(default_factory=list)
+    os: List[str] = field(default_factory=list)
+    formula: Optional[str] = None  # for brew
+    package: Optional[str] = None  # for pip/npm
+    module: Optional[str] = None
+    url: Optional[str] = None  # for download
+    archive: Optional[str] = None
+    extract: bool = False
+    strip_components: Optional[int] = None
+    target_dir: Optional[str] = None
+
+
+@dataclass
+class SkillMetadata:
+    """Metadata for a skill from frontmatter."""
+    always: bool = False  # Always include this skill
+    skill_key: Optional[str] = None  # Override skill key
+    primary_env: Optional[str] = None  # Primary environment variable
+    emoji: Optional[str] = None
+    homepage: Optional[str] = None
+    os: List[str] = field(default_factory=list)  # Supported OS platforms
+    requires: Dict[str, List[str]] = field(default_factory=dict)  # Requirements
+    install: List[SkillInstallSpec] = field(default_factory=list)
+
+
+@dataclass
+class Skill:
+    """Represents a skill loaded from a markdown file."""
+    name: str
+    description: str
+    file_path: str
+    base_dir: str
+    source: str  # managed, workspace, bundled, etc.
+    content: str  # Full markdown content
+    disable_model_invocation: bool = False
+    frontmatter: Dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass
+class SkillEntry:
+    """A skill with parsed metadata."""
+    skill: Skill
+    metadata: Optional[SkillMetadata] = None
+    user_invocable: bool = True  # Can users invoke this skill directly
+
+
+@dataclass
+class LoadSkillsResult:
+    """Result of loading skills from a directory."""
+    skills: List[Skill]
+    diagnostics: List[str] = field(default_factory=list)
+
+
+@dataclass
+class SkillSnapshot:
+    """Snapshot of skills for a specific run."""
+    prompt: str  # Formatted prompt text
+    skills: List[Dict[str, str]]  # List of skill info (name, primary_env)
+    resolved_skills: List[Skill] = field(default_factory=list)
+    version: Optional[int] = None