PRACTICAL FIELD GUIDE
Owner IDs are assigned from the authenticated caller
On owner-mode creation, ownership comes from the calling user's identity rather than a client-selected owner field. This protects the boundary against users creating records for someone else.
MCPBackend editorial team · · Examples are illustrative
Put it into practice
- Enable the intended owner policy and confirm its owner-column configuration.
- Create a disposable row with a real user token.
- Verify the stored owner and test that a supplied different owner value cannot impersonate another user.
What this looks like
ILLUSTRATIVE EXAMPLE
A browser submits owner_id for a different account. The owner-mode creation path associates the new row with the authenticated caller.
A boundary to keep clear
Do not build an owner-reassignment workflow by asking the browser to patch the owner field. Use a separately designed privileged process if needed.
MCPBackend context
MCPBackend row policies apply to anonymous callers and end-user tokens. Machine API keys bypass those row policies and are instead constrained by their own table permissions. Owner mode is based on the calling user's identity; it is not an organization-membership or arbitrary custom-policy engine.
Take the next step
Inspect the current project contract, try the change with disposable data, and verify the result through the same credentials your app will use. Record the expected response and one denied-access case before release.
Sources and further reading
These references explain the underlying protocols and design principles. For supported MCPBackend operations and exact request shapes, inspect your project’s generated API contract.