lane-mcp-auth
OAuth 2.1 resource server and consent gate for an MCP server behind Lane — the
Python distribution of @getonlane/mcp-auth.
Docs — overview · quickstart · the gate · reference
pip install lane-mcp-auth # core
pip install 'lane-mcp-auth[fastmcp]' # + the FastMCP helpers
Your server verifies bearer tokens, publishes the discovery document clients need, and refuses every tool until the caller holds a recorded, revocable grant.
Set up with one command where the server runs. It pairs with the Lane console
and writes the credential to .env; the secret never passes through a browser:
python -m lane_mcp_auth setup https://acme.example/mcp --name="Acme shop"
Pass client_id and announce_secret and the server announces the resource it
serves on its first guarded call, so Lane binds the hostname to the credential.
from lane_mcp_auth import LaneMcpAuth
auth = LaneMcpAuth(
resource="https://acme.example/mcp",
connections=connections, # yours: this is server-side state
exchanger=exchanger,
)
The three tiers
| tier | reached by | declared |
|---|---|---|
| authenticated only | — | not registrable |
| any connected caller | completing the step-up | no scope |
| a specific authority | the step-up granting it | scope="…" |
Registration is the floor. Omitting a scope means any connected caller, never anyone: a session that has not registered has nothing anyone can revoke, so a tool answering it would be answering something nobody can withdraw.
With FastMCP
from lane_mcp_auth.fastmcp import register_step_up_tool, guarded
register_step_up_tool(mcp, auth)
@mcp.tool()
@guarded(auth, "read_orders", scope="email")
async def read_orders(ctx) -> str:
return await orders_for(ctx)
Never authorize on the token's scopes
claims.scopes is the token's own claim: empty before the step-up, stale after.
Authority lives in the connection and is reachable only through has_scope() /
effective_scopes(), because Lane decides it at exchange time and can refuse an
exchange it would previously have allowed. A signed claim cannot be withdrawn.
Parity with the TypeScript
Same invariants, same names where Python idiom allows. The TypeScript package is
the reference implementation; where the two could drift — scope filtering, the
metadata paths, the gate's decision table — see SCOPE.md for what is
implemented here and what is not yet.
Licence
MIT
1 maintainer
Release files for lane-mcp-auth 0.7.1
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