The version pattern in _anthropic_rejects_temperature() required a minor
component, so major-only ids like `claude-opus-5` never matched and the
guard reported that the model accepts `temperature`. Anthropic rejects the
field outright on Opus 4.7+, so every such call returned HTTP 400 and the
stream aborted with zero tokens ("the model returned an empty response").
Make the minor optional and read a missing minor as `.0`. The major is also
capped at 1-2 digits with a no-trailing-digit lookahead, mirroring the
minor: once the minor is optional, a greedy major would swallow the date in
`claude-3-opus-20240229` and read it as version 20240229, dropping
temperature from a model that accepts it.
Fixes#5753
Co-authored-by: Alexandre Teixeira <111787685+alteixeira20@users.noreply.github.com>
The placeholder-restore pass in mdToHtml put code, math, mermaid and
allowed-HTML blocks back with a string replacement, so String.replace read
`$&`, `` $` ``, `$'` and `$$` in the *replacement* as substitution patterns.
A fenced block containing them rendered corrupted: `$&` re-inserted the
placeholder (`perl -pe 's/world/$& again/'` became
`s/world/___CODE_BLOCK_0___amp; again/`), `` $` `` and `$'` spliced in the
surrounding document, and `$$` collapsed to a single `$`.
Pass a function replacer at all four sites, matching the inline-code site
below them, which was already fixed this way. A function's return value is
inserted verbatim with no `$` interpretation.
The inline-code comment claimed `echo $1` would be read as a back-reference;
with a string search value there are no capture groups, so `$1` is already
literal. Reworded to name the four sequences that do corrupt.
Fixes#5663
* fix(skills): replace deprecated utcnow in skill timestamp helper
_now_iso() builds the 'created' value in skill frontmatter. datetime.utcnow()
returns a naive datetime and has been deprecated since Python 3.12, scheduled
for removal. Switch to the timezone-aware datetime.now(timezone.utc), keeping
the serialized YYYY-MM-DDTHH:MM:SSZ shape unchanged so existing skill files
keep parsing.
timezone.utc is used rather than the datetime.UTC alias, which is 3.11+ only.
Adds regression tests covering the deprecation, the serialized shape, and
UTC correctness under a non-UTC local timezone -- the last guards against a
bare datetime.now(), which yields the same shape but local wall time.
Fixes#5697
* test(skills): skip timezone mutation where unsupported
---------
Co-authored-by: Alexandre Teixeira <alexandremagteixeira@gmail.com>
