agentskills-fs 0.2.3

Filesystem-based skill provider for the Agent Skills format (https://agentskills.io)

agentskills-fs

Local filesystem skill provider for the Agent Skills SDK.

Serves Agent Skills from a local directory tree. Each subdirectory containing a SKILL.md file is a skill.

Installation

pip install agentskills-fs

Requires Python 3.12 or 3.13. Installs agentskills-core and pyyaml as dependencies.

Expected Directory Layout

skills/
├── incident-response/
│   ├── SKILL.md              # YAML frontmatter + markdown body
│   ├── references/           # supplementary docs (optional)
│   ├── scripts/              # executable scripts (optional)
│   └── assets/               # diagrams, data files (optional)
└── another-skill/
    └── SKILL.md

Usage

from pathlib import Path
from agentskills_core import SkillRegistry
from agentskills_fs import LocalFileSystemSkillProvider

provider = LocalFileSystemSkillProvider(Path("./skills"))
registry = SkillRegistry()
await registry.register("incident-response", provider)

skill = registry.get_skill("incident-response")
meta = await skill.get_metadata()
body = await skill.get_body()
script = await skill.get_script("page-oncall.sh")

The provider reads files synchronously (local disk I/O is fast for small skill files) but exposes an async interface to satisfy the SkillProvider contract.

Security

• Path-traversal protection - Skill IDs and resource names are validated to stay within the root directory. Attempts to escape (e.g. ../../etc/passwd) raise SkillNotFoundError or ResourceNotFoundError.
• File size limits - Files exceeding 10 MB (default) are rejected before reading into memory. Configure via the max_file_bytes parameter.
• Error-message sanitization - Error messages reference the skill_id rather than full filesystem paths, preventing internal path leakage.

For the full security policy, see SECURITY.md.

API

LocalFileSystemSkillProvider(root, *, max_file_bytes=10_485_760)

Parameter	Type	Default	Description
root	Path	-	Path to the directory containing skill subdirectories
max_file_bytes	int	10_485_760 (10 MB)	Maximum allowed file size in bytes

Method	Returns	Description
get_metadata(skill_id)	dict[str, Any]	Parsed YAML frontmatter from SKILL.md
get_body(skill_id)	str	Markdown body after the frontmatter
get_script(skill_id, name)	bytes	Raw content of a script file
get_asset(skill_id, name)	bytes	Raw content of an asset file
get_reference(skill_id, name)	bytes	Raw content of a reference file

License

MIT