skill.mount

A named, versioned skill whose tools return signedEnvelopevalues.

Decorate handlers withtool(), then mount with use_skill()::

skill = Skill(
    "demo",
    version="1.0.0",
    private_key=private,
    key_id="demo-1",
    public_key=public,
)

@skill.tool("add", description="Add two integers")
def add(a: int, b: int) -> int:
    return a + b

@skill.tool("hook", scopes=("webhook:write",))
def hook(payload: dict) -> dict:
    return payload

use_skill(app, skill)
app.register_scope("webhook:write")

Mountskill's tools onto app's MCP tool registry via app.tool.

Registersskill as an app domain so app.freeze()finalizes an immutableManifestwith a content digest (milo register_domainprecedent). Eagerly verifies the Ed25519 peer dependency when a signing key is present so missingcryptographyfails at setup rather than on the first tool call. Registers the skill_contract app.check()category (chirp_ui register_contract_check pattern). Returns skill.