Functions overview

A Cloud Function is a named operation Cloud resolves from a registry (or org saved SQL), then sends to the device agent through the Gateway as db.query or db.health.

List

GET /v1/devices/{device_id}/functions

Response items include:

Field	Meaning
`id`	Invoke id (`sicarv4.products.search`, `saved.<uuid>`, …)
`adapter`	`sicarv4` or `*`
`description`	Human summary
`kind`	`registry` \| `saved`
`params`	Declared `input` fields for invoke

Invoke

POST /v1/devices/{device_id}/functions/{function_id}

See Invoke for body shape and auth rules.

Policies

Policy	Who builds SQL	Allowed
`read` / `read_only`	Registry or client (custom)	SELECT / SHOW / DESCRIBE only
`write` / `registry_write`	Cloud registry only	Multi-statement INSERT/UPDATE scripts

Clients cannot send raw mutating SQL. Use *.create functions with structured document JSON.

Adapters

Adapter	Docs
`sicarv4`	SICAR V4 functions