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Skills are reusable instruction blocks that an agent can load dynamically at runtime. 
from langchain_adk import Skill, InMemorySkillStore
from langchain_adk.skills.load_skill_tool import make_load_skill_tool, make_list_skills_tool

store = InMemorySkillStore([
    Skill(
        name="summarization",
        description="How to write concise summaries.",
        content="Extract the 3-5 most important points. Use bullet points. Be concise.",
    ),
    Skill(
        name="code_review",
        description="How to conduct a thorough code review.",
        content="Check correctness, readability, test coverage, and security.",
    ),
])

agent = LlmAgent(
    name="SkillfulAgent",
    llm=llm,
    tools=[
        make_list_skills_tool(store),   # lets agent discover available skills
        make_load_skill_tool(store),    # lets agent load a skill's full content
    ],
)
The agent calls list_skills to discover what’s available, then load_skill("summarization") to get the full instruction text.
Custom backends — Implement BaseSkillStore for any backend (database, file system, API).