Claude Opus 5.5 (effort default (no --effort flag) · thinking on) on Finish a JSON Schema subset validator (types, JSON equality, pointer-escaped paths, $ref recursion, combinators)

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  "result": "I rewrote `validator.py` to follow `SCHEMA_RULES.md`. The function name, the `{\"path\", \"keyword\"}` error format and `SchemaError` are unchanged. It uses only the standard library. I checked it with a set of hand-written cases and all gave the expected errors, but I haven't run it against the hidden suite.\n\n**Bugs fixed in the old version:**\n- **Missing required properties:** these were reported at `/<name>`; they now go at the object's own path, as rule 7 says.\n- **Types:** booleans were accepted as numbers or integers and `2.0` was rejected as an integer. Both are fixed. When `type` fails, that is now the only error from that schema at that location.\n- **`minimum`/`maximum`:** these were checked against booleans and wrongly-typed values; they now apply only to real numbers.\n- **`enum`:** this used Python's `==`, so `True` matched `1`. It now uses JSON equality, where `1 == 1.0` but `true != 1`, comparing inside lists and objects too.\n- **`anyOf`:** this was passing on every subschema's errors; it now gives one `anyOf` error, and only when no subschema matches.\n- **Paths:** keys weren't escaped (`a/b~c` now becomes `a~1b~0c`), and a `false` schema used to crash.\n\n**Keywords added:** `exclusiveMinimum`/`exclusiveMaximum`, `minLength`/`maxLength` (counting Unicode code points), `pattern` (using `re.search`), `additionalProperties`, `minItems`/`maxItems`, `uniqueItems` (one error for the whole array), `const`, `allOf`, `oneOf`, `not`, and `$ref`.\n\n**How I handled cases the rules don't settle:**\n- **`$ref`:** it accepts `#` and `#/$defs/<name>` and is checked alongside the other keywords in the same schema. Recursive schemas work. If a `$ref` points straight back to itself (like `{\"$ref\": \"#\"}`) at the same location, it would loop forever, so I treat that case as passing.\n- **Unresolvable `$ref`:** `SchemaError` is raised only when the validator actually reaches that `$ref`. If an earlier `type` check fails first, the bad `$ref` is never looked at and nothing is raised.\n- **Ignored values:** keyword values of the wrong shape (for example a non-list `enum` or a boolean `exclusiveMinimum`) are skipped, like unknown keywords.",
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