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Custom contexts are tagged through autoconfiguration, which gives them priority 0. That is higher than both built-in contexts, so a context that always returns a value silently disables the toggler: the button still writes the cookie, but CookieBasedVatContext never gets asked. Document the ordering, list the built-in priorities, and show how to tag a context explicitly to sit below the customer's own choice. Also fixes 'with our without VAT' in the same paragraph. Claude-Session: https://claude.ai/code/session_01P9NzuVPQGvaVR97HZFq98a
This was referenced Aug 23, 2026
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The README tells you to implement
VatContextInterface, but not the part that decides whether your context actually works.Custom contexts are tagged through
registerForAutoconfiguration(), which gives them priority 0. Both built-in contexts sit below that (CookieBasedVatContextat -90,DefaultVatContextat -100), so a custom context that always returns a value silently disables the toggler — the button still writes the cookie, and nothing ever reads it. That is a confusing thing to debug from the symptom ("the toggle button does nothing"), and nothing in the docs points at it.This documents the ordering and the fall-through contract (throw
NoVatContextExceptionto defer), lists the built-in priorities in a table, and shows how to tag a context explicitly so it is consulted after the customer's own choice.Also fixes "with our without VAT" in the same paragraph.
No code changes.
Addresses the second architecture item in #5.
https://claude.ai/code/session_01P9NzuVPQGvaVR97HZFq98a