Update 2026-05-13 16:43:53
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yi
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"""Skills loader for agent capabilities."""
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import json
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import os
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import re
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import shutil
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from pathlib import Path
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# Default builtin skills directory (relative to this file)
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BUILTIN_SKILLS_DIR = Path(__file__).parent.parent / "skills"
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class SkillsLoader:
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"""
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Loader for agent skills.
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Skills are markdown files (SKILL.md) that teach the agent how to use
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specific tools or perform certain tasks.
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"""
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def __init__(self, workspace: Path, builtin_skills_dir: Path | None = None):
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self.workspace = workspace
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self.workspace_skills = workspace / "skills"
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self.builtin_skills = builtin_skills_dir or BUILTIN_SKILLS_DIR
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def list_skills(self, filter_unavailable: bool = True) -> list[dict[str, str]]:
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"""
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List all available skills.
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Args:
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filter_unavailable: If True, filter out skills with unmet requirements.
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Returns:
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List of skill info dicts with 'name', 'path', 'source'.
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"""
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skills = []
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# Workspace skills (highest priority)
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if self.workspace_skills.exists():
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for skill_dir in self.workspace_skills.iterdir():
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if skill_dir.is_dir():
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skill_file = skill_dir / "SKILL.md"
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if skill_file.exists():
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skills.append({"name": skill_dir.name, "path": str(skill_file), "source": "workspace"})
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# Built-in skills
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if self.builtin_skills and self.builtin_skills.exists():
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for skill_dir in self.builtin_skills.iterdir():
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if skill_dir.is_dir():
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skill_file = skill_dir / "SKILL.md"
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if skill_file.exists() and not any(s["name"] == skill_dir.name for s in skills):
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skills.append({"name": skill_dir.name, "path": str(skill_file), "source": "builtin"})
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# Filter by requirements
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if filter_unavailable:
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return [s for s in skills if self._check_requirements(self._get_skill_meta(s["name"]))]
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return skills
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def load_skill(self, name: str) -> str | None:
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"""
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Load a skill by name.
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Args:
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name: Skill name (directory name).
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Returns:
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Skill content or None if not found.
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"""
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# Check workspace first
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workspace_skill = self.workspace_skills / name / "SKILL.md"
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if workspace_skill.exists():
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return workspace_skill.read_text(encoding="utf-8")
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# Check built-in
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if self.builtin_skills:
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builtin_skill = self.builtin_skills / name / "SKILL.md"
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if builtin_skill.exists():
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return builtin_skill.read_text(encoding="utf-8")
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return None
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def load_skills_for_context(self, skill_names: list[str]) -> str:
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"""
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Load specific skills for inclusion in agent context.
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Args:
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skill_names: List of skill names to load.
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Returns:
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Formatted skills content.
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"""
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parts = []
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for name in skill_names:
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content = self.load_skill(name)
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if content:
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content = self._strip_frontmatter(content)
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parts.append(f"### Skill: {name}\n\n{content}")
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return "\n\n---\n\n".join(parts) if parts else ""
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def build_skills_summary(self) -> str:
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"""
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Build a summary of all skills (name, description, path, availability).
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This is used for progressive loading - the agent can read the full
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skill content using read_file when needed.
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Returns:
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XML-formatted skills summary.
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"""
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all_skills = self.list_skills(filter_unavailable=False)
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if not all_skills:
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return ""
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def escape_xml(s: str) -> str:
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return s.replace("&", "&").replace("<", "<").replace(">", ">")
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lines = ["<skills>"]
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for s in all_skills:
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name = escape_xml(s["name"])
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path = s["path"]
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desc = escape_xml(self._get_skill_description(s["name"]))
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skill_meta = self._get_skill_meta(s["name"])
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available = self._check_requirements(skill_meta)
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lines.append(f" <skill available=\"{str(available).lower()}\">")
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lines.append(f" <name>{name}</name>")
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lines.append(f" <description>{desc}</description>")
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lines.append(f" <location>{path}</location>")
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# Show missing requirements for unavailable skills
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if not available:
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missing = self._get_missing_requirements(skill_meta)
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if missing:
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lines.append(f" <requires>{escape_xml(missing)}</requires>")
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lines.append(" </skill>")
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lines.append("</skills>")
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return "\n".join(lines)
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def _get_missing_requirements(self, skill_meta: dict) -> str:
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"""Get a description of missing requirements."""
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missing = []
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requires = skill_meta.get("requires", {})
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for b in requires.get("bins", []):
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if not shutil.which(b):
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missing.append(f"CLI: {b}")
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for env in requires.get("env", []):
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if not os.environ.get(env):
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missing.append(f"ENV: {env}")
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return ", ".join(missing)
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def _get_skill_description(self, name: str) -> str:
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"""Get the description of a skill from its frontmatter."""
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meta = self.get_skill_metadata(name)
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if meta and meta.get("description"):
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return meta["description"]
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return name # Fallback to skill name
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def _strip_frontmatter(self, content: str) -> str:
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"""Remove YAML frontmatter from markdown content."""
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if content.startswith("---"):
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match = re.match(r"^---\n.*?\n---\n", content, re.DOTALL)
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if match:
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return content[match.end():].strip()
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return content
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def _parse_nanobot_metadata(self, raw: str) -> dict:
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"""Parse skill metadata JSON from frontmatter (supports nanobot and openclaw keys)."""
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try:
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data = json.loads(raw)
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return data.get("nanobot", data.get("openclaw", {})) if isinstance(data, dict) else {}
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except (json.JSONDecodeError, TypeError):
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return {}
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def _check_requirements(self, skill_meta: dict) -> bool:
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"""Check if skill requirements are met (bins, env vars)."""
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requires = skill_meta.get("requires", {})
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for b in requires.get("bins", []):
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if not shutil.which(b):
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return False
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for env in requires.get("env", []):
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if not os.environ.get(env):
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return False
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return True
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def _get_skill_meta(self, name: str) -> dict:
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"""Get nanobot metadata for a skill (cached in frontmatter)."""
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meta = self.get_skill_metadata(name) or {}
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return self._parse_nanobot_metadata(meta.get("metadata", ""))
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def get_always_skills(self) -> list[str]:
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"""Get skills marked as always=true that meet requirements."""
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result = []
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for s in self.list_skills(filter_unavailable=True):
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meta = self.get_skill_metadata(s["name"]) or {}
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skill_meta = self._parse_nanobot_metadata(meta.get("metadata", ""))
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if skill_meta.get("always") or meta.get("always"):
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result.append(s["name"])
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return result
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def get_skill_metadata(self, name: str) -> dict | None:
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"""
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Get metadata from a skill's frontmatter.
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Args:
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name: Skill name.
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Returns:
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Metadata dict or None.
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"""
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content = self.load_skill(name)
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if not content:
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return None
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if content.startswith("---"):
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match = re.match(r"^---\n(.*?)\n---", content, re.DOTALL)
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if match:
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# Simple YAML parsing
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metadata = {}
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for line in match.group(1).split("\n"):
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if ":" in line:
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key, value = line.split(":", 1)
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metadata[key.strip()] = value.strip().strip('"\'')
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return metadata
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return None
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