FIELD NOTE / TIKTOK
A valid choice can go stale before use.
The short film, the complete written thought, and the evidence behind it.
A valid choice can go stale before use.
Video caption
A valid choice can go stale before use. The old decision cannot authorize the new tool. Current authority outranks yesterday's model choice. #EricFieldNotes
Full written post / accessibility read
An agent router selects a tool bundle at time one. Before the worker uses it, the bundle's schema or permission changes. The old choice may have been reasonable when made and unsafe now. This is a time-of-check versus time-of-use problem.
In this simulated case, a data-read tool becomes a data-write route under the same friendly name. If dispatch trusts only the earlier decision receipt, it can cross a boundary without asking again. The Avid build describes rechecking route eligibility and tool definitions before dispatch.
Store a fingerprint of the permitted route and tool definition with the proposal. In a disposable test, change one harmless field after selection. Dispatch must reject the stale fingerprint, re-evaluate against current authority and record any fallback.
Treat selection as a proposal. At dispatch, compare the route, schema and permission with current policy; fail closed or choose a logged fallback when they differ. Do this because stale choices should never become durable authorization.
#EricFieldNotes
Four-beat scene transcript
1. A valid choice can go stale before use.
An agent router selects a tool bundle at time one. Before the worker uses it, the bundle's schema or permission changes. The old choice may have been reasonable when made and unsafe now. This is a time-of-check versus time-of-use problem.
Visual: The selector saw one tool version; dispatch sees another.
2. A receipt is not a live permission.
In this simulated case, a data-read tool becomes a data-write route under the same friendly name. If dispatch trusts only the earlier decision receipt, it can cross a boundary without asking again. The Avid build describes rechecking route eligibility and tool definitions before dispatch.
Visual: The old decision cannot authorize the new tool.
3. Bind choice to an eligibility fingerprint.
Store a fingerprint of the permitted route and tool definition with the proposal. In a disposable test, change one harmless field after selection. Dispatch must reject the stale fingerprint, re-evaluate against current authority and record any fallback.
Visual: Change a harmless schema between selection and dispatch.
4. Revalidate at use time.
Treat selection as a proposal. At dispatch, compare the route, schema and permission with current policy; fail closed or choose a logged fallback when they differ. Do this because stale choices should never become durable authorization.
Visual: Current authority outranks yesterday's model choice.
Research and claim limits
The examples identified as illustrative or simulated are design probes, not reported incidents. Vendor specifications do not establish workload performance.