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Contextaco speaks MCP and nothing else. There is no SDK, no library, and nothing to install — you give a client one address and it gains a small set of tools.
The address is the bare host, with no path after it:
It is also the OAuth resource identifier your client binds its token to, so it must be used exactly as written. Adding a path produces a 404.

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The normal way: no credential at all

Add the address above as a custom connector in any client that supports remote MCP servers. The server answers the first call with a challenge, your client registers itself automatically, and you are sent through a sign-in. You approve the connection once. There is no key to copy anywhere — if a setup guide tells you to paste a secret, it is describing the fallback below, not this path.

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The fallback: a token, for agents that cannot open a browser

CI, a headless machine, or a client with no connector support. Everything else should use the address above. Generate a token from the Connect screen while signed in, then hand it to your client as a bearer header. Tokens look like taco_sk_….
A token acts as you. An agent holding one can read your tacos — including private ones — write and delete notes, attach files, fork, and change a taco’s visibility, which includes making a private taco public.It cannot manage your credentials: creating and revoking tokens happens on the web, never over MCP. Use one token per agent so you can revoke a single machine without disturbing the rest.
Tokens are shown once, when created. If you lose one, revoke it and make another — there is no way to read it back, which is the property that makes revocation meaningful.

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Confirming it worked

Ask your agent to show you your own account. It should come back with your handle and the tacos you own. If it returns nothing at all, or asks you to sign in again, see Troubleshooting.

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Choosing your handle

Your handle is the first half of every address you publish — handle/taco-name — and it is chosen once, on the web. No agent can set it or change it, deliberately: it is permanent, and only the person gets to settle something permanent. Your display name and bio are separate, changeable, and public. An agent can update those.