Use ${ARRAY[@]+"${ARRAY[@]}"} pattern for all array expansions that
could be empty (category arrays, errors array, function parameters).
Bash 3.2 with set -u treats "${EMPTY[@]}" as an unbound variable error,
while bash 4+ handles it gracefully. The +"..." syntax expands to nothing
when the array is unset/empty, avoiding the crash.
Also fix AGENTS.md claiming CI only runs on skills/** changes — the
validate-skill-tree job runs on all PRs (it's fast enough not to need
path filtering).
Adds scripts/build-skill-tree.sh — a bash-only script that scans
all skills/*/SKILL.md files, regenerates SKILL_TREE.md from live
frontmatter data, and validates the entire skill hierarchy.
What the script does:
1. Scan — finds all SKILL.md files via find, parses YAML frontmatter
(name, description, category, parent, role, disable-model-invocation)
using awk. No external dependencies beyond standard Unix tools.
2. Categorize — groups skills by category field, identifies routers
by role: router.
3. Generate — rebuilds SKILL_TREE.md with Quick Navigation table,
per-category skill tables (SDK Setup, Workflow, Feature Setup,
Internal), and short column values extracted from descriptions.
4. Validate — checks every rule without stopping on first failure:
- Non-router/non-internal skills must have category, parent, and
disable-model-invocation: true
- Internal skills must have disable-model-invocation: true
- Every skill's parent must exist and have role: router
- Each skill must appear in its router's SKILL.md
- All breadcrumb .md links must resolve to real files
- Warns on unknown categories
5. Stale check — diffs generated vs existing SKILL_TREE.md; writes
file unless --check is passed (check-only mode for CI).
Uses a temp-directory pattern for per-skill data storage instead of
bash 4 associative arrays, keeping it compatible with macOS bash 3.2.
Also updates SKILL_TREE.md to match the script's generated output
(column values are now extracted from descriptions via sed, ordering
follows find | sort alphabetical).
Co-Authored-By: Claude Sonnet 4.5 (Anthropic)
Update documentation to reflect the full skill catalog ported from
sentry-agent-skills. Skills are now organized into four categories:
- SDK bundles (9): full platform setup wizards with reference docs
- Setup skills (2): AI monitoring, OTel exporter
- Workflow skills (4): code review, PR review, fix issues, create alerts
- Authoring skills (1): SDK skill creator
Also adds scripts/generate-skill-list.sh from sentry-agent-skills for
generating skill lists from SKILL.md frontmatter.
Co-Authored-By: Claude (Anthropic)
Daniel Griesser