API reference · Trust Fabric

Halt every subsequent action for this tenant

POST /fabric/kill-switch

Last reviewed 2026-10-03

POST /fabric/kill-switch

Emergency stop.

Distinct from revoking a principal, which is the surgical tool for one leaked key. This is for the case where something is wrong and you do not yet know which agent -- you stop everything and read the evidence afterwards. Having to enumerate and revoke principals one at a time during an incident is not an incident response.

Blocks regardless of whether the Fabric is in enforce or shadow mode: a stop button that honours an observability setting is not a stop button.

Request body

KillSwitchRequest (required)

Field	Type	Meaning
`reason` required	string	why the halt was engaged -- read by whoever finds it later, so it is mandatory min length `3` · max length `500`

Responses

Status	Meaning	Body
`200`	Successful Response	JSON
`422`	Validation Error	`HTTPValidationError`
`401`	No key, or a key that is not valid	JSON `detail`
`429`	Rate limit for your plan reached; retry after the Retry-After seconds	JSON `detail`

Try it

Your API key X-API-Key Remember the key in this tab onlyRequest body application/json

This call changes data in the account the key belongs to.

The request goes from your browser straight to this site. Your key is not stored unless you tick the box, and then only in this tab's session storage.

Code

curl -sS -X POST 'https://cainstudio.online/fabric/kill-switch' \
  -H "X-API-Key: $CAIN_API_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"reason": "reason"}'

import json, os, urllib.request

req = urllib.request.Request('https://cainstudio.online/fabric/kill-switch', method='POST',
    headers={"X-API-Key": os.environ["CAIN_API_KEY"], "Content-Type": "application/json"},
    data=json.dumps({
      "reason": "reason"
    }).encode())
with urllib.request.urlopen(req, timeout=60) as r:
    print(r.status, json.load(r))

const res = await fetch("https://cainstudio.online/fabric/kill-switch", {
  method: "POST",
  headers: {
    "X-API-Key": process.env.CAIN_API_KEY!,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "reason": "reason"
  }),
});
console.log(res.status, await res.json());

Schemas used

HTTPValidationError · ValidationError · KillSwitchRequest

← Whether this tenant's agents are halted · all 79 Trust Fabric calls · Release the halt and allow actions again →

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