attachment.fetched

A harness downloaded an attachment. Every fetch is an audit event: “Scout read IMG_2210.jpg”.

Direction: Chips → the log
Sent by: Chips only; refused from a client
Requires a run: no
Schema: attachment.fetched.json

Fields

Every event also carries the envelope.

Field	Required	Type	Description
v	yes	1	Protocol major version.
type	yes	"attachment.fetched"
id	yes	string	The event’s own id. Stable across a retry of the same event.
ts	yes	string	When it happened, by Chips’ clock. Stamped on the way in; a value the sender writes is replaced.
workspace_id	yes	string	A workspace identifier: ws_ followed by a ULID.
space_id	no	string	The space, when the event belongs to one.
run_id	no	string	The run, when the event belongs to one.
seq	no	number	Assigned by the server on append, monotonic per workspace. Absent on the way in.
idempotency_key	no	string	Required on every client-originated write. Sending the same key twice is a no-op.
actor	yes	object	The participant an event is attributed to.
actor.kind	yes	"person" | "harness" | "agent" | "system"	Whether a person, a harness, one of a harness’s agents or Chips itself acted.
actor.id	yes	string	The participant id, or system for Chips.
actor.harness_id	no	string	For an agent: the harness it speaks through, whose budget and runs are the agent’s (ADR 0087). Filled in by Chips.
attachment_id	yes	string	A attachment identifier: att_ followed by a ULID.
filename	yes	string	What the file was called when it was sent.
by	yes	string	The harness that fetched it. Recorded by Chips.

Example

{
  "v": 1,
  "type": "attachment.fetched",
  "id": "evt_01K4ZQPX0000000000000000CC",
  "ts": "2026-09-02T14:22:16.504Z",
  "workspace_id": "ws_01K4ZQPX000000000000000001",
  "space_id": "spc_01K4ZQPX000000000000000002",
  "actor": {
    "kind": "harness",
    "id": "hrn_01K4ZQPX000000000000000004"
  },
  "attachment_id": "att_01K4ZQPX000000000000000008",
  "filename": "PO-4471.pdf",
  "by": "hrn_01K4ZQPX000000000000000004"
}