1@README.md
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3- **Estimates use `TokenRatio::FALLBACK`:** the tool has no cache to learn a
4  ratio from, and the fallback can only overstate the price.
5- **Pricing goes through `TokenRatio::worst_case`, the same formula the
6  extension's spend guard uses;** never restate it here.
7- **`--send` finds the extension and the server through the values
8  `tests/BUCK` gives the tests, compiled in (`BUCK` `env`),** and
9  re-executes itself with them set, since `tests/support` reads them from
10  the environment and setting its own environment is `unsafe`. Under cargo
11  they are absent and `--send` refuses.
12- **The forwarder records only the response headers the client reads, and
13  never the key.**
14- **What the gates ask lives in `tests/support/gates.rs`,** shared with the
15  replays; change it there, never with a second copy here.