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* fix(openai): drop tool schema regex patterns OpenAI's validator cannot compile
OpenAI validates function tool parameters with jsonschema's format checker,
which compiles every pattern with Python re. Claude Code's Artifact tool ships
an ECMA-262 pattern with \p{..} Unicode property escapes, so any OpenAI target
behind /v1/messages, /v1/responses or /v1/chat/completions 400s with
"Invalid schema for function 'Artifact': '...' is not a 'regex'" for every
model family. Drop only the patterns Python re rejects, keep the rest, at the
same seams that already flatten top-level combinators.
* fix(openai): walk only schema positions, iteratively, and drop regexes for every openai deployment
Review round: the regex sanitizer now walks JSON Schema applicator positions
only (properties, items, prefixItems, combinators, $defs, additionalProperties
and the rest), so a pattern key inside default, examples, const or a vendor
extension is data and stays. It also drops patternProperties keys Python re
cannot compile, which OpenAI checks the same way. The walk is level-order and
rebuilt deepest level first instead of recursive, so the code-quality recursion
gate passes and there is no depth cap below what a JSON parser admits. On the
chat wire an openai deployment with a custom api_base now drops such regexes
too, since that base is usually a proxy in front of the same validator, while
the lossier combinator flattening stays limited to api.openai.com hosts.
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