Create a workspace workflow hook

POST/api/v2/workspaces/{slug}/workflows/{workflow_id}/state-transitions/{transition_id}/hooks/

Add a hook to a transition of a catalog workflow. The new hook runs last in its phase, because Plane sets execution_order to one more than the highest in that phase.

For a send_webhook hook, the 201 response is the only place the signing secret appears, as config.secret_plaintext. Store it then. No read returns it again. To get a new one, use Regenerate a workspace workflow hook secret.

Each handler needs its own plan feature: Plane Runner for run_script, and Webhook transition conditions for send_webhook. Without that feature, the request returns 402 payment_required.

Path Parameters

slug:requiredstring

The workspace slug. It appears in your Plane URLs. In https://app.plane.so/my-team/projects/, the slug is my-team.

workflow_id:requiredstring (uuid)

The catalog workflow the transition belongs to.

transition_id:requiredstring (uuid)

The transition the hooks run on. It must belong to the workflow in the path, or the request returns 404.

Body Parameters

phase:requiredstring

When the hook runs. Fixed at creation.

• pre: before the move. The first pre hook that fails blocks the move.
• post: after the move. Every post hook runs, and a failure doesn't undo the move.

handler_name:requiredstring

What the hook does, run_script or send_webhook. Fixed at creation.

config:requiredobject

The handler's settings. The shape depends on handler_name.

For run_script:

• script_id string (uuid), required. A system script, or a script in this workspace that isn't tied to a project.
• execution_variables object, optional. Values passed to the script. It must be an object.

For send_webhook:

• url string, required. Where to send the event. Plane rejects destinations it won't deliver to, such as private network addresses.
• headers array of object, optional. Up to 20 extra request headers, each with key (1 to 256 characters), value (up to 8192 characters), and is_secret (defaults to true). Keys must be unique, and the comparison ignores case. Host, Content-Length, Content-Type, User-Agent, X-Plane-Delivery, X-Plane-Event, and X-Plane-Signature are reserved. Plane stores secret header values encrypted.

Don't send a signing secret. Plane generates one for every send_webhook hook.

is_enabled:optionalboolean

Whether the hook runs. Defaults to true.

Response shaping

fields:optionalstring

Comma-separated list of fields to return. Unrequested keys are omitted from the response, not returned as null, so absent means "not requested" and null means "actually null". id always comes back whether or not you name it.

Pass all for every requestable field. An unknown name is a 400 that lists the valid set and suggests the closest match, so a typo can't silently cost you the saving.

Requestable here: config, created_at, execution_order, handler_name, id, is_enabled, phase, project_id, updated_at, workflow_transition_id.

See Sparse fields.

Scopes

workspaces.workflows:write

Errors

Status	Code	Cause
400	invalid_request	A phase or handler_name outside the enum, a run_script config without a usable script_id or with a non-object execution_variables, or a send_webhook config with an invalid URL or headers.
401	unauthorized	Missing or invalid credentials.
402	payment_required	Workflows isn't on your plan, or the handler's plan feature isn't: Plane Runner for run_script, Webhook transition conditions for send_webhook.
403	forbidden	Your role or token scope can't edit workspace workflows.
404	not_found	No such workflow in this workspace's catalog, or no such transition in it.
406	not_acceptable	The Accept header asks for a representation the API can't produce.
409	governance_migration_in_progress	A governance migration is running in this workspace, so writes are paused. Retry after it finishes.
409	states_managed_at_project	The workspace doesn't have governance turned on. Use the project's workflows instead.
413	payload_too_large	The request body is over the size limit.
415	unsupported_media_type	The Content-Type isn't one this endpoint accepts.
429	rate_limited	Throttled. Honor the Retry-After header before retrying.

Create a workspace workflow hook

curl -X POST \
  "https://api.plane.so/api/v2/workspaces/my-team/workflows/9c1f0b3d-6d2e-4c9a-8b41-2f7e5a0d6c88/state-transitions/d7a3f5c9-0b2e-4d81-b6f4-9e1c3a5d7b20/hooks/" \
  -H "X-Api-Key: $PLANE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "phase": "post",
  "handler_name": "send_webhook",
  "config": {
    "url": "https://hooks.example.com/plane",
    "headers": [
      {
        "key": "X-Team",
        "value": "platform",
        "is_secret": false
      }
    ]
  }
}'

import requests

response = requests.post(
    "https://api.plane.so/api/v2/workspaces/my-team/workflows/9c1f0b3d-6d2e-4c9a-8b41-2f7e5a0d6c88/state-transitions/d7a3f5c9-0b2e-4d81-b6f4-9e1c3a5d7b20/hooks/",
    headers={"X-Api-Key": "your-api-key"},
    json={
        "phase": "post",
        "handler_name": "send_webhook",
        "config": {
            "url": "https://hooks.example.com/plane",
            "headers": [
                {
                    "key": "X-Team",
                    "value": "platform",
                    "is_secret": False,
                },
            ],
        },
    },
)
print(response.json())

const response = await fetch(
  "https://api.plane.so/api/v2/workspaces/my-team/workflows/9c1f0b3d-6d2e-4c9a-8b41-2f7e5a0d6c88/state-transitions/d7a3f5c9-0b2e-4d81-b6f4-9e1c3a5d7b20/hooks/",
  {
    method: "POST",
    headers: {
      "X-Api-Key": "your-api-key",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      phase: "post",
      handler_name: "send_webhook",
      config: {
        url: "https://hooks.example.com/plane",
        headers: [
          {
            key: "X-Team",
            value: "platform",
            is_secret: false,
          },
        ],
      },
    }),
  },
);
const data = await response.json();

Response201

{
  "id": "e4b7c9a2-3d1f-4e68-8a52-9f0c6b3d7e15",
  "workflow_transition_id": "d7a3f5c9-0b2e-4d81-b6f4-9e1c3a5d7b20",
  "project_id": null,
  "phase": "post",
  "handler_name": "send_webhook",
  "is_enabled": true,
  "execution_order": 1,
  "config": {
    "url": "https://hooks.example.com/plane",
    "headers": [
      {
        "key": "X-Team",
        "value": "platform",
        "is_secret": false
      }
    ],
    "secret_plaintext": "plane_wh_4f9a2c7e1b8d4e3fa6c05d9b2e7f7c1d"
  },
  "created_at": "2026-01-15T11:04:52.660219Z",
  "updated_at": "2026-01-15T11:04:52.660219Z"
}

Response400

{
  "type": "invalid_request",
  "code": "invalid_request",
  "detail": "One or more fields failed validation.",
  "errors": [
    {
      "field": "config",
      "code": "invalid",
      "message": "Invalid send_webhook hook configuration. Check the webhook URL and headers."
    }
  ]
}

Response402

{
  "type": "payment_required",
  "code": "payment_required",
  "detail": "The send_webhook handler is not enabled for this workspace."
}