Jadpo is experimental and not ready for production. These docs follow the compiler's main branch as of 5 Nov 2026. What's built · Install 0.3.0

ReferenceErrors

Errors Sign-in and identity · rule

`type.auth_principal_output`

Output field holds a caller.

Area 8, Sign-in and identity; not declinable; the next step is usually the agent's.

example

principal {    user: {        subject: Member.handle    }}type Handle = Text {    max_length: 40}entity Member {    id: Uuid    handle: Handle {        unique: true    }}type Whoami = Output {    caller: Principal.user}

jadpo checkcheck failed: 1 error, 1 file

error Whoami.caller holds a caller

--> main.jadpo:19:13

   |19 |     caller: Principal.user   |             ^^^^^^^^^^^^^^ a caller

reason: A caller value is who signed in, as the runtime holds it, and is never sent to a client; an output sends the fields a client needs.
next: Type caller with the entity's id, such as User.id, or send the fields a client needs (agent)
rule: type.auth_principal_output
help: https://jadpo.dev/docs/errors/type.auth_principal_output

Markdown for agents: /docs/errors/type.auth_principal_output.md.Built from Jadpo main at aee2e8f.