Secrets

A secret is a credential stored on your Kody account — an API key, a personal access token, a webhook signing secret, a private key. Your agent can write code that uses a secret. It can never read one.

The rule: there is no secret_get

The secrets capabilities are secretList, secretSet, secretSetMany, secretLock, secretDelete, and secretJwtSign. Nothing returns a value. secretList returns metadata only: names, descriptions, approved hosts, expiry, and remaining time to live.

This is why you can hand an agent a job that needs your GitHub token without the token ever entering the prompt, the transcript, or the model provider's logs. The same is true for every agent connected to the account: the secret is shared; the value is shared with none of them.

How code uses a secret

Code refers to a secret by name. Kody substitutes the value at the network boundary, on the final serialized request, and only for hosts you approved.

• Placeholders in fetch — {{secret:githubAccessToken}} in a URL, header, or body of an outbound fetch resolves when the request leaves Kody. This is not general string interpolation; it works only in secret-aware fetch.
• Derived headers — when an API wants Basic Auth built from two secrets, secretHeaders.basic({ usernameSecret, passwordSecret }) from kody:runtime produces the header without exposing either half.
• Signed JWTs — secretJwtSign signs a JWT with a stored private key (RS256 or EdDSA) and returns the compact token, never the key.

Placeholders are live tokens. Do not paste one into an issue body, a comment, a log line, or a returned string — write {{secret:<name>}} with angle brackets when you need to mention the syntax in prose.

Two approvals, both yours

Saving a secret does not by itself let anything use it.

• Host approval decides which destinations a secret may be sent to. A secret with an empty host allowlist blocks every placeholder fetch, including from packages you wrote yourself. Approve hosts on /connect/secrets — one link can cover several secrets and several hosts at once. Kody never approves a host automatically; an ad hoc smoke test that happened to work does not widen the allowlist.
• Package approval decides which saved packages may read and use a user-scoped secret. Packages you authored and community forks you adopted after reviewing the source get read/use automatically. Unadopted forks need an explicit grant. Updating or deleting a user secret from package code always needs the grant. Agents add a package with secretLock; removing a grant is website-only on /account/secrets/user/:name.

Bulk approval URLs (/account/secrets/approve?package_id=…&names=a,b) let you approve several pending secrets for one package in a click.

Scopes

• User secrets belong to the account and can be approved for any package.
• Package secrets belong to one saved package and exist only while that package runs — they are package config, keyed by the package id.

OAuth access and refresh tokens are different: they live on the integration, rotate through createAuthenticatedFetch, and do not appear in the secrets list. A pasted API key is a secret; a Slack login is an integration. See Packages, integrations, and MCP servers.

Expiry

A secret can carry an expiry (expires_at). Expired secrets stay listed with ttl_ms: 0, and placeholders treat them as missing so Kody stops sending the value. Agents prefilling /account/secrets/new can set expiresAt in the query string so the person pastes the token without typing a date.

When a token is coarser than the job

Providers do not always offer the scope you want. Gmail has a send scope and no drafts-only scope. When the token can do more than the job should, publish the narrow behavior as a package, lock the package, and lock the integration to it. After that, execute cannot borrow the token and a later publish cannot quietly add a send path. See Gmail drafts without send and Lock an MCP server to a package for the same pattern on connected tool servers.

Adding a secret

• Pasting a key or PAT: the agent sends you a prefilled /account/secrets/new link; you paste the value into the page, never into chat. URL shape and parameters: Secret setup URL reference.
• Building an integration around one or more secrets: Secret-backed integrations.
• A token that already exists inside trusted code (a key the package just minted): secretSet persists it without returning it.

Where to go next

• Secrets and host approval — the MCP-level reference with the exact placeholder, header, and approval semantics.
• Integration bootstrap — the sequence before a secret-backed package is saved.