diff --git a/AGENTS.md b/AGENTS.md
index f2716b8e0..a30ffe18e 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -11,7 +11,7 @@ Each project lives in its own top-level directory; the [quest tree](quest/README
 
 - Pull the latest origin changes before working.
 - Dig into the root cause and fix it at the source. Never work around a fixable bug with a retry, sleep, or timeout, nor pass a flaky test by loosening its assertion.
-- Fail loud and early. An unsupported construct or malformed input is an error with a source span, never a warning or a silent fallback.
+- Fail loud and early. An unsupported construct or malformed input is a compile error with a source span, never a warning, a silent fallback, or a runtime failure. Generated code panics only where the Rust source does.
 - Generated output must match the source's semantics exactly: integer widths and overflow, drop order, laziness, and error paths. Prove it with differential tests against native Rust, not by inspection.
 - Reproduce bugs before fixing them. Tests must be worth their weight long-term: cover edge cases, not old bugs or trivial values.
 - Keep the PR to one problem: no unrelated refactors, formatting churn, or drive-by changes. Fix every instance of that problem in the same PR.
@@ -31,7 +31,8 @@ Each project lives in its own top-level directory; the [quest tree](quest/README
 
 - Prefer upstream and maintained crates over hand-rolling. Measure before claiming an improvement over them.
 - Every change needs a consumer that uses it now and is worth its cost; name it in the PR. moq is the first consumer of every project here.
-- Translators take stock crates as they are: no annotations, and no config beyond true platform boundaries. Each config key or source change a consumer needs is a gap to close.
+- Everything is configless, with opinionated names and defaults. Translators take stock crates as they are: no annotations, and no config beyond true platform boundaries. Each config key or source change a consumer needs is a gap to close.
+- A vanity rename, if ever supported, is opt-in and lives inline in source next to the item, never in a config file.
 - Deleting code is better than adding code.
 - Comments explain the non-obvious why, never the history.
 - New dependencies use the newest stable version. Do not bump package versions unless asked.