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Patrick Buckley d16c911750 feat(skills): paste SKILL.md to auto-fill the Create Skill modal (#477)
* feat(skills): paste SKILL.md to auto-fill the Create Skill modal

When a user pastes an Anthropic-style SKILL.md (YAML frontmatter +
markdown body) into the Create Skill content textarea, the frontend
sniffs the leading ``---``, posts the raw text to a new backend parse
endpoint, and populates name / description / tags / author / version /
license / compatibility / allowed_tools from the parsed fields.  The
textarea is left with the body only (frontmatter stripped), and a toast
reports how many fields were set vs. kept (already-typed values are
preserved).

Backend
- ``POST /v1/api/admin/skills/parse`` (admin.skills permission) wraps
  the existing ``turnstone.core.skill_parser.parse_skill_md`` so admin
  imports and external installs share one parser.  ``ParseSkillRequest``
  / ``ParseSkillResponse`` schemas added; OpenAPI spec + sync/async
  console SDK methods updated.
- Hardening: 32 KiB cap on ``raw`` (Pydantic ``max_length`` + handler
  enforcement); ``Content-Length`` pre-check returns 413 before any body
  buffering; parse offloaded via ``asyncio.to_thread`` so deeply-nested
  YAML cannot stall the event loop.

Frontend (turnstone/console/static)
- New paste handler with optimistic paint (raw text shown immediately,
  textarea disabled + ``aria-busy`` flipped, hint switches to
  "Parsing...") so the round-trip is visible on slow networks.
- ``AbortController`` + generation guard (``_ctmPasteController``) so a
  fresh paste or modal close cancels a stale fetch — the previous
  handler's callbacks see the controller has been replaced and bail
  before touching the DOM.
- Non-destructive overwrite: ``_setSkillFormField`` returns "filled" /
  "skipped" / "absent" and refuses to clobber non-empty values.  Toast
  reports counts.
- Bumps ``#toast`` z-index above modal overlays (was 200 vs. modal 600
  — toasts fired while a modal was open were invisible).  Console-wide
  fix exposed by this being the first feature to fire toasts mid-modal.

HTML / CSS
- New ``.skill-paste-hint`` line above the textarea announcing the
  affordance, sized to match surrounding ``.label-hint`` text.
- ``aria-describedby`` ties the hint to the textarea; ``aria-live=
  "polite"`` announces the busy-state transition to screen readers.
- "Skill Content" heading hint reworded "system message — ..." →
  "available: ..." and the variables row label "Variables" → "Used"
  to disambiguate available vs. in-use template variables.

Tests
- 11 new cases in ``tests/test_skill_parse_api.py``: happy paths
  (full / minimal / nested-metadata / unquoted-colon recovery),
  malformed YAML 400, missing/blank/missing-name 400, RBAC 403, raw
  body 32 KiB cap (Content-Length pre-check), chunked-encoding bypass
  forces the application-layer cap.  Test pins ``raw_frontmatter``
  omission so a future ``dataclasses.asdict`` refactor can't silently
  leak the full YAML dict back to clients.

Validation
- 5146 / 5146 ``pytest -k "not live"`` pass.
- ``ruff`` + ``mypy`` clean on changed sources.
- ``node -c`` clean on governance.js.
- Two-stage code review (full pipeline + bug+quality re-review of the
  fix patches) applied; all confirmed findings addressed.

* fix(skills): Copilot PR #477 review fixes (cumulative bug-1, bug-2, q-1)

bug-1 (server.py): Content-Length pre-check was clamped to 32 KiB —
the same number as the per-string char cap on ``raw``.  A legitimate
``raw`` of exactly 32 KiB produces a JSON body well above 32 KiB once
the ``{"raw":"..."}`` wrapper and any escaping is added, so valid
near-max requests were 413'd.  New constant
``_PARSE_SKILL_MAX_BODY_BYTES = _PARSE_SKILL_MAX_CHARS * 4`` admits the
wrapper + multibyte expansion while still refusing obviously oversized
payloads early; the per-string ``len(raw)`` check stays authoritative.

bug-2 (governance.js): hideCreateTemplateModal aborted the inflight
paste controller and nulled the global, but the handler's ``.catch``
and ``.finally`` guard each DOM mutation behind ``_isCurrent()`` —
both bail when the controller has been nulled, leaving the textarea
``disabled`` + ``aria-busy`` and the hint stuck on "Parsing…".
Reopening the modal landed on a poisoned state.  The second-pass
review's q-2 cleanup that dropped the show-side defensive reset
missed this scenario — the verifier's reachability argument confused
"controller is null" with "UI state is reset"; the two are
independent.  Hide now resets the paste-induced visible state
alongside the abort.

q-1 (console_spec.py): error_codes for the parse endpoint listed only
400; handler also returns 413 for oversized bodies.  Added 413; kept
403 implicit per the convention sibling admin endpoints follow.

Test fixup: bumped the Content-Length test payload to 200 KB so it
clearly exceeds the new 128 KB pre-check threshold; otherwise it was
falling through to the per-string check and duplicating
test_oversized_raw_chunked_returns_413's coverage.

(cherry picked from commit 0a8083e6d5)
2026-05-07 17:35:20 -07:00