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The identifier test was ASCII-only, so an object with a `路径` field degraded to dict[str, Any] -- dropping every sibling field's name, requiredness and type, with no native schema behind it in Code Mode to carry them. Python identifiers are `xid_start xid_continue*`, so match that instead, and widen camelCase's split and head check to the same sets (naming `_` explicitly in the split, since it is XID_Continue). NFKC stability is a second and separate condition. CPython normalizes identifiers at compile time while a JSON key is compared as written, so a U+FB01 ligature key would be declared and reachable under its ASCII expansion, a key the tool never accepts, and two keys that normalize together would collapse into one declaration. Those names take the subscript path. Generated class names are normalized instead of rejected -- they are never matched against a key. Astral characters can now reach the class-name cap, whose slice counts UTF-16 code units, so drop a split surrogate half. Also fix two comment claims. The note said one projection reads the runtime twice per tool; the language-aware getters are installed on run_code's own definition, so it is twice, both for that schema. And the 182-bracket site's reachability is an array reached from the root through oneOf arms alone -- a union spine of any depth, not just one root union; an object ancestor restarts the chain at the 181 site.