agentskills-langchain 0.2.3

LangChain integration for the Agent Skills format (https://agentskills.io)

agentskills-langchain

LangChain integration for the Agent Skills SDK - turn a skill registry into LangChain tools.

Generates a set of LangChain StructuredTool instances from a SkillRegistry, ready to be passed to any LangChain agent.

Installation

pip install agentskills-langchain

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

Usage

from agentskills_core import SkillRegistry
from agentskills_fs import LocalFileSystemSkillProvider
from agentskills_langchain import get_tools, get_tools_usage_instructions

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

# Build tools + system prompt
tools = get_tools(registry)
catalog = await registry.get_skills_catalog(format="xml")
instructions = get_tools_usage_instructions()
system_prompt = f"{catalog}\n\n{instructions}"

Pass tools to your LangChain agent and inject system_prompt into the system message. The catalog tells the agent what skills exist; the usage instructions tell it how to use the tools.

Generated Tools

Tool	Parameters	Description
get_skill_metadata	skill_id	Get structured metadata (name, description, etc.)
get_skill_body	skill_id	Load the full markdown instructions
get_skill_reference	skill_id, name	Read a reference document
get_skill_script	skill_id, name	Read a script
get_skill_asset	skill_id, name	Read an asset

All tools are async-compatible (StructuredTool with coroutine).

API

get_tools(registry: SkillRegistry) -> list[StructuredTool]

Returns a list of LangChain structured tools bound to the given registry.

get_tools_usage_instructions() -> str

Returns a markdown string explaining the progressive-disclosure workflow - read metadata, then body, then fetch resources on demand. Designed for system-prompt injection alongside the skill catalog.

Example

See examples/langchain/ for a full working demo.

Error Handling

Scenario	Exception
Skill not found in registry	SkillNotFoundError
Resource not found in skill	ResourceNotFoundError
Provider errors (HTTP, filesystem)	AgentSkillsError

All exceptions inherit from AgentSkillsError (from agentskills-core).

Note: Binary content (scripts, assets, references) is decoded as UTF-8 with errors="replace". Non-decodable bytes are replaced with the Unicode replacement character (�).

License

MIT