Update Custom Tool

Update the supplied custom tool fields. Omitted fields retain their stored values, and titles must remain unique within the workspace.

PATCH/api/v2/custom-tools/{id}

Authorization

apiKey
X-API-Key<token>

Your Sim API key, personal or workspace-scoped. Generate one from the Sim dashboard under Settings > API Keys. A workspace API key is not accepted everywhere: operations that act on behalf of a specific human — administrative reads, secret access, and irreversible or governance-affecting writes — always reject it, whatever role the key carries. Each such operation says so in its own description, and the rejection surfaces as 403 unless the operation conceals unauthorized resources, in which case it is reported as 404. Use a personal API key for those.

In: header

Path Parameters

id*string

Custom tool to retrieve, update, or delete.

Length1 <= length

Request Body

application/json

Custom tool fields to change; at least one editable field is required.

TypeScript Definitions

Use the request body type in TypeScript.

Response Body

application/json

application/json

application/json

application/json

application/json

application/json

application/json

application/json

application/json

curl -X PATCH "https://www.sim.ai/api/v2/custom-tools/string" \  -H "Content-Type: application/json" \  -d '{    "workspaceId": "a91c4b2e-6d3f-4e8a-b5c7-0d9e2f1a8c64",    "code": "return { ok: false }"  }'
{
  "data": {
    "id": "V1StGXR8Z5jdHi6BmyT",
    "title": "lookup_order",
    "schema": {
      "type": "function",
      "function": {
        "name": "lookup_order",
        "description": "Look up an order by id",
        "parameters": {
          "type": "object",
          "properties": {
            "orderId": {
              "type": "string"
            }
          },
          "required": [
            "orderId"
          ]
        }
      }
    },
    "code": "return { ok: false }",
    "createdAt": "2026-06-01T09:14:00.000Z",
    "updatedAt": "2026-06-20T14:02:11.000Z"
  }
}
{
  "error": {
    "code": "BAD_REQUEST",
    "message": "The request is invalid."
  }
}
{
  "error": {
    "code": "BAD_REQUEST",
    "message": "The request is invalid."
  }
}
{
  "error": {
    "code": "BAD_REQUEST",
    "message": "The request is invalid."
  }
}
{
  "error": {
    "code": "BAD_REQUEST",
    "message": "The request is invalid."
  }
}
{
  "error": {
    "code": "BAD_REQUEST",
    "message": "The request is invalid."
  }
}
{
  "error": {
    "code": "BAD_REQUEST",
    "message": "The request is invalid."
  }
}
{
  "error": {
    "code": "BAD_REQUEST",
    "message": "The request is invalid."
  }
}
{
  "error": {
    "code": "BAD_REQUEST",
    "message": "The request is invalid."
  }
}