feat: 新增外部条目上游健康检查与每周巡检工作流 (#188)

## 背景
外部条目只存上游指针，上游仓库被删除、分支被重写或技能目录移动时，客户端安装会静默失败，目前没有任何机制能发现（例如
`dingtalk-cli` 的上游已 404，见修复 PR）。

## 变更
- **`scripts/catalog/check_upstream_health.py`**：只读，逐个检查
`skills/`、`agents/`、`teams/` 下的 `entry.json`：
- 失效（退出码 1）：`gone` 上游不存在 · `bad-branch` 分支不存在 · `bad-ref` 固定提交无法获取 ·
`bad-path` `source.path`、根 `SKILL.md` 或 children 路径在分支最新提交下缺失
- 提示：`unreachable` 网络错误（不等于失效）· `new-skill` 集合有未声明子技能（发现规则直接复用
`gen-collection-children.py` 的 `discover_children`，两者结论一致）· `outdated`
固定 ref 落后于分支 · `unpinned` 未锁定 ref
  - 只稀疏检出 `SKILL.md`，39 个条目本地全量运行约 12 秒
- **`scripts/catalog/test_check_upstream_health.py`**：9 个基于本地 Git
仓库的单测，已加入 `i18n-validate.yml`。
- **`.github/workflows/upstream-health.yml`**：每周一 01:23 UTC 运行（可手动触发），仅在
`desirecore/market` 运行：
- 报告写入 Job Summary，并维护唯一一个带 `upstream-health` 标签的
Issue：有待处理项时创建或更新，全部正常时评论并关闭
  - 有失效条目时任务标红
- 权限仅 `contents: read` + `issues: write`，**不改写任何目录文件**；修复与 `source.ref`
更新仍通过评审 PR（与固定 ref 的审查语义一致）
- README 中英文补充用法。

## 当前主干的检查结果
- 失效 1：`dingtalk-cli`（已有修复 PR）
- 未声明子技能 3：`khazix-skills`、`marketingskills`、`mattpocock-skills`
- 可更新 21 个，未锁定 1 个
- `amap-jsapi-skill`、`luckin-my-coffee` 在本地因代理显示 `unreachable`，需要 CI
环境确认

## 验证
```
uv run scripts/catalog/test_check_upstream_health.py   # Ran 9 tests OK
uv run scripts/catalog/check_upstream_health.py        # 如上
uv run scripts/i18n/validate-i18n.py                   # 0 error(s)
```

🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_0191D9g1FhRQzEGTefUn6mTb

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Yige <a@wyr.me>

.github/workflows/i18n-validate.yml

@@ -67,6 +67,7 @@ jobs:
         run: |
           uv run --quiet scripts/catalog/test_validate_catalog_metadata.py
           uv run --quiet scripts/catalog/test_collection_generator.py
+          uv run --quiet scripts/catalog/test_check_upstream_health.py
 
       - name: Validate catalog metadata
         if: steps.changes.outputs.relevant == 'true'

.github/workflows/upstream-health.yml

@@ -0,0 +1,87 @@
+name: Upstream Health
+
+# Weekly check that every external pointer (skills/agents/teams entry.json)
+# still resolves upstream. Results go to one tracking issue labelled
+# `upstream-health`, which is updated in place and closed once nothing is
+# actionable. Fixing an entry stays a normal reviewed PR; this workflow never
+# rewrites catalog files.
+
+on:
+  schedule:
+    - cron: "23 1 * * 1" # Mondays 01:23 UTC
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  issues: write
+
+concurrency:
+  group: upstream-health
+  cancel-in-progress: false
+
+jobs:
+  check:
+    if: github.repository == 'desirecore/market'
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
+
+      - name: Check upstreams
+        id: check
+        run: |
+          set +e
+          uv run --quiet scripts/catalog/check_upstream_health.py --format markdown > report.md
+          code=$?
+          set -e
+          if [ "$code" -gt 1 ]; then
+            echo "health check crashed with exit code $code" >&2
+            exit "$code"
+          fi
+          echo "broken=$([ "$code" = 1 ] && echo true || echo false)" >> "$GITHUB_OUTPUT"
+          if grep -qE '^### (Broken|Undeclared upstream skills|Updates available) ' report.md; then
+            echo "actionable=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "actionable=false" >> "$GITHUB_OUTPUT"
+          fi
+          cat report.md >> "$GITHUB_STEP_SUMMARY"
+
+      - name: Update tracking issue
+        env:
+          GH_TOKEN: ${{ github.token }}
+          ACTIONABLE: ${{ steps.check.outputs.actionable }}
+          RUN_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
+        run: |
+          set -euo pipefail
+          label=upstream-health
+          gh label create "$label" --color D93F0B \
+            --description "Upstream availability of external catalog entries" 2>/dev/null || true
+
+          {
+            echo "_Updated by [Upstream Health]($RUN_URL) on $(date -u +%Y-%m-%d)._"
+            echo
+            echo "Fix entries through a normal PR: repoint or remove \`gone\` entries, correct \`bad-*\` paths, and review upstream changes before bumping \`source.ref\` for \`outdated\` entries (rerun \`scripts/gen-collection-children.py\` for collections). \`unreachable\` means a network error, not a confirmed failure."
+            echo
+            cat report.md
+          } > body.md
+
+          issue=$(gh issue list --label "$label" --state open --limit 1 --json number --jq '.[0].number // empty')
+          if [ "$ACTIONABLE" = "true" ]; then
+            if [ -n "$issue" ]; then
+              gh issue edit "$issue" --body-file body.md
+            else
+              gh issue create --title "Upstream health report" --label "$label" --body-file body.md
+            fi
+          elif [ -n "$issue" ]; then
+            gh issue comment "$issue" --body "All external entries resolve upstream and are current as of $RUN_URL. Closing."
+            gh issue close "$issue"
+          fi
+
+      - name: Fail when an entry is broken
+        if: steps.check.outputs.broken == 'true'
+        run: |
+          echo "::error::At least one external entry no longer resolves upstream; see the upstream-health issue."
+          exit 1

README.md

@@ -209,6 +209,7 @@ uv run scripts/i18n/translate.py --check skills/web-access
 uv run scripts/i18n/test_validate_i18n.py
 uv run scripts/catalog/test_validate_catalog_metadata.py
 uv run scripts/catalog/test_collection_generator.py
+uv run scripts/catalog/test_check_upstream_health.py
 ```
 
 Passing a skill path narrows skill-body validation, but market-level and sidecar checks still run. Choose the relevant test file for your change rather than treating every documentation edit as a reason to run all test suites.
@@ -221,10 +222,16 @@ uv run scripts/gen-collection-children.py --check
 
 # Optional source-URL availability checks in addition to normal validation.
 uv run scripts/i18n/validate-i18n.py --online
+
+# Report deleted upstreams, missing branches or pinned refs, moved skill paths,
+# undeclared collection children, and available updates for every external entry.
+uv run scripts/catalog/check_upstream_health.py
 ```
 
 Collection checking requires Git and network access. Mutable collections are reported and skipped because their generated inventory is not reproducible. Omitting `--check` runs the generator in write mode; review both the regenerated children and the corresponding sidecar facts before committing.
 
+The upstream health check is read-only and exits non-zero when an entry is `gone` or has a `bad-branch`, `bad-ref`, or `bad-path`. `unreachable` is a network error, not a confirmed failure. The [upstream health workflow](.github/workflows/upstream-health.yml) runs it weekly and keeps one `upstream-health` issue current; fixes and `source.ref` bumps still go through reviewed PRs.
+
 The [validation workflow](.github/workflows/i18n-validate.yml) is the source of truth for CI. It detects relevant paths and can skip catalog validation for documentation-only changes. A green skipped job is not evidence that Markdown links or bilingual documentation were checked; review those separately.
 
 ## Security and trust

README.zh-CN.md

@@ -209,6 +209,7 @@ uv run scripts/i18n/translate.py --check skills/web-access
 uv run scripts/i18n/test_validate_i18n.py
 uv run scripts/catalog/test_validate_catalog_metadata.py
 uv run scripts/catalog/test_collection_generator.py
+uv run scripts/catalog/test_check_upstream_health.py
 ```
 
 传入技能路径只缩小技能正文的校验范围，市场级与 sidecar 检查仍会执行。应根据改动选择相关测试文件，而不是每次修改文档都运行全部测试。
@@ -221,10 +222,16 @@ uv run scripts/gen-collection-children.py --check
 
 # 可选：在常规校验之外检查来源 URL 是否可访问。
 uv run scripts/i18n/validate-i18n.py --online
+
+# 检查所有外部条目：上游是否已删除、分支或固定提交是否失效、技能路径是否移动、
+# 集合是否有未声明的子技能，以及是否有可同步的更新。
+uv run scripts/catalog/check_upstream_health.py
 ```
 
 集合检查需要 Git 和网络。可变来源集合会被报告并跳过，因为无法保证生成清单可复现。省略 `--check` 会进入写入模式；提交前应同时检查重新生成的子技能和对应 sidecar 事实。
 
+上游健康检查只读，不改写条目；出现 `gone`、`bad-branch`、`bad-ref` 或 `bad-path` 时以非零状态退出。`unreachable` 表示网络错误，不等于确认失效。[上游健康工作流](.github/workflows/upstream-health.yml)每周运行一次，并维护唯一一个 `upstream-health` Issue；修复条目和更新 `source.ref` 仍需通过经过评审的 PR。
+
 [校验工作流](.github/workflows/i18n-validate.yml)是 CI 行为的权威来源。它会检测相关路径，纯文档改动可能跳过目录校验。跳过后显示成功的任务，不代表 Markdown 链接或中英文文档已被检查；这些内容仍需单独审查。
 
 ## 安全与信任边界

scripts/catalog/check_upstream_health.py

@@ -0,0 +1,266 @@
+#!/usr/bin/env -S uv run --script
+# /// script
+# requires-python = ">=3.10"
+# dependencies = ["pyyaml>=6.0"]
+# ///
+"""Report the upstream health of every external pointer in the catalog.
+
+External entries (`skills/*/entry.json`, `agents/*/entry.json`,
+`teams/*/entry.json`) keep their content upstream, so a deleted repository, a
+rewritten branch or a moved skill directory silently breaks installation. This
+script looks at each upstream and reports, without rewriting anything:
+
+  gone        upstream repository or URL no longer exists (deleted, private, 404/410)
+  bad-branch  source.repoBranch no longer exists upstream
+  bad-ref     pinned source.ref can no longer be fetched (history rewritten)
+  bad-path    source.path, the root SKILL.md, or a declared child path is missing at
+              branch head
+  unreachable network error other than "not found"; treated as unknown, not broken
+  new-skill   branch head has collection children that `children` does not declare
+              (same discovery rules as scripts/gen-collection-children.py)
+  outdated    pinned source.ref is behind branch head; an update is available
+  unpinned    entry follows a moving branch without source.ref
+  ok          nothing to report
+
+Path checks run against branch head: they answer "will this pointer still work
+after the next ref bump", while `bad-ref` answers "does the pinned ref still
+resolve". Only skills get path checks; agents and teams are AgentFS repositories.
+
+Usage:
+  uv run scripts/catalog/check_upstream_health.py                  # text table
+  uv run scripts/catalog/check_upstream_health.py --format markdown
+  uv run scripts/catalog/check_upstream_health.py --format json
+  uv run scripts/catalog/check_upstream_health.py dingtalk-cli humanlayer-skills
+
+Exit code: 1 when any entry is gone / bad-branch / bad-ref / bad-path, else 0.
+Needs Git and network access.
+"""
+
+from __future__ import annotations
+
+import argparse
+import importlib.util
+import json
+import os
+import re
+import subprocess
+import sys
+import tempfile
+import urllib.error
+import urllib.request
+from concurrent.futures import ThreadPoolExecutor
+from pathlib import Path
+
+REPO_ROOT = Path(__file__).resolve().parents[2]
+KINDS = ("skills", "agents", "teams")
+
+BROKEN = ("gone", "bad-branch", "bad-ref", "bad-path")
+ORDER = (*BROKEN, "unreachable", "new-skill", "outdated", "unpinned", "ok")
+
+# Git asks for credentials when a public repository disappears; never prompt.
+GIT_ENV = {**os.environ, "GIT_TERMINAL_PROMPT": "0", "GCM_INTERACTIVE": "never"}
+NOT_FOUND = re.compile(
+    r"repository not found|authentication failed|could not read username|"
+    r"not found|does not exist|does not appear to be a git repository",
+    re.IGNORECASE,
+)
+
+
+def _load_generator():
+    """Reuse the collection generator's discovery so both tools agree on children."""
+    path = REPO_ROOT / "scripts" / "gen-collection-children.py"
+    spec = importlib.util.spec_from_file_location("market_collection_generator", path)
+    assert spec is not None and spec.loader is not None
+    module = importlib.util.module_from_spec(spec)
+    sys.modules[spec.name] = module
+    spec.loader.exec_module(module)
+    return module
+
+
+GENERATOR = _load_generator()
+
+
+def git(*args: str, cwd: Path | None = None, timeout: int = 180) -> subprocess.CompletedProcess:
+    try:
+        return subprocess.run(["git", *args], cwd=cwd, capture_output=True, text=True,
+                              env=GIT_ENV, timeout=timeout)
+    except subprocess.TimeoutExpired:
+        return subprocess.CompletedProcess(args, 124, "", "timed out")
+
+
+def last_line(text: str) -> str:
+    lines = [line for line in text.strip().splitlines() if line.strip()]
+    return lines[-1][:200] if lines else "no output"
+
+
+def check_git(entry: dict, kind: str) -> list[tuple[str, str]]:
+    source = entry["source"]
+    url = source["repoUrl"]
+    branch = source.get("repoBranch")
+    ref = source.get("ref")
+    issues: list[tuple[str, str]] = []
+
+    query = ["--heads", url, branch] if branch else [url, "HEAD"]
+    remote = git("ls-remote", *query, timeout=90)
+    if remote.returncode != 0:
+        detail = last_line(remote.stderr)
+        return [("gone" if NOT_FOUND.search(remote.stderr) else "unreachable", detail)]
+    heads = [line.split()[0] for line in remote.stdout.splitlines() if line.strip()]
+    if branch and not heads:
+        return [("bad-branch", f"branch '{branch}' not found upstream")]
+    if not heads:
+        return [("unreachable", "remote advertised no HEAD")]
+    head = heads[0]
+
+    with tempfile.TemporaryDirectory(prefix=f"health-{entry['id']}-") as tmp:
+        repo = Path(tmp) / "repo"
+        clone = ["clone", "--quiet", "--depth", "1", "--filter=blob:none", "--no-checkout"]
+        if branch:
+            clone += ["--single-branch", "-b", branch]
+        cloned = git(*clone, url, str(repo), timeout=300)
+        if cloned.returncode != 0:
+            return [("unreachable", f"clone failed: {last_line(cloned.stderr)}")]
+
+        if ref and ref != head:
+            fetched = git("fetch", "--quiet", "--depth", "1", "origin", ref, cwd=repo, timeout=180)
+            if fetched.returncode != 0:
+                issues.append(("bad-ref", f"pinned {ref[:12]} is no longer fetchable"))
+
+        if kind == "skills":
+            issues += check_skill_paths(entry, repo)
+
+    if ref and ref != head:
+        issues.append(("outdated", f"{ref[:7]} -> {head[:7]}"))
+    if not ref:
+        issues.append(("unpinned", f"follows '{branch or 'HEAD'}' at {head[:7]}"))
+    return issues
+
+
+def check_skill_paths(entry: dict, repo: Path) -> list[tuple[str, str]]:
+    # Materialise only SKILL.md files; the generator reads their frontmatter.
+    git("sparse-checkout", "set", "--no-cone", "SKILL.md", cwd=repo)
+    checkout = git("checkout", "--quiet", "HEAD", cwd=repo, timeout=300)
+    if checkout.returncode != 0:
+        return [("unreachable", f"checkout failed: {last_line(checkout.stderr)}")]
+
+    skill_dirs = {p.parent.relative_to(repo).as_posix() for p in repo.rglob("SKILL.md")
+                  if ".git" not in p.parts}
+    skill_dirs = {"" if d == "." else d for d in skill_dirs}
+    issues: list[tuple[str, str]] = []
+    children = entry.get("children") or []
+
+    if children:
+        declared = {c["path"].strip("/") for c in children}
+        for child in children:
+            if child["path"].strip("/") not in skill_dirs:
+                issues.append(("bad-path", f"child '{child['id']}' -> '{child['path']}' has no SKILL.md"))
+        discovered = [c for c in GENERATOR.discover_children(repo) if c["path"] not in declared]
+        declared_ids = {c["id"] for c in children}
+        extra = [c["path"] for c in discovered if c["id"] not in declared_ids]
+        if extra:
+            shown = ", ".join(extra[:8]) + (f" (+{len(extra) - 8} more)" if len(extra) > 8 else "")
+            issues.append(("new-skill", shown))
+    else:
+        path = (entry["source"].get("path") or "").strip("/")
+        if path not in skill_dirs:
+            where = f"source.path '{path}'" if path else "repository root"
+            issues.append(("bad-path", f"{where} has no SKILL.md"))
+    return issues
+
+
+def check_http(entry: dict) -> list[tuple[str, str]]:
+    url = entry["source"].get("url") or entry["source"].get("repoUrl")
+    request = urllib.request.Request(url, headers={"User-Agent": "desirecore-market-health", "Range": "bytes=0-0"})
+    try:
+        with urllib.request.urlopen(request, timeout=30):
+            return []
+    except urllib.error.HTTPError as err:
+        if err.code in (404, 410):
+            return [("gone", f"HTTP {err.code}")]
+        return [("unreachable", f"HTTP {err.code}")]
+    except Exception as err:  # noqa: BLE001 - network errors are reported, not raised
+        return [("unreachable", str(err)[:200])]
+
+
+def check_entry(path: Path) -> dict:
+    entry = json.loads(path.read_text(encoding="utf-8"))
+    kind = path.parent.parent.name
+    source = entry.get("source", {})
+    issues = check_git(entry, kind) if source.get("kind") == "git" else check_http(entry)
+    return {
+        "id": entry["id"],
+        "kind": kind.rstrip("s"),
+        "url": source.get("repoUrl") or source.get("url"),
+        "issues": [{"status": s, "detail": d} for s, d in (issues or [("ok", "")])],
+    }
+
+
+def worst(result: dict) -> int:
+    return min(ORDER.index(i["status"]) for i in result["issues"])
+
+
+def render_text(results: list[dict]) -> str:
+    rows = []
+    for r in sorted(results, key=lambda r: (worst(r), r["id"])):
+        for issue in sorted(r["issues"], key=lambda i: ORDER.index(i["status"])):
+            rows.append(f"{issue['status']:<11} {r['kind']:<6} {r['id']:<32} {issue['detail']}")
+    return "\n".join(rows)
+
+
+def render_markdown(results: list[dict]) -> str:
+    counts = {s: 0 for s in ORDER}
+    for r in results:
+        counts[ORDER[worst(r)]] += 1
+    summary = " · ".join(f"{s}: {n}" for s, n in counts.items() if n)
+    out = [f"Checked {len(results)} external entries. {summary}", ""]
+    sections = [
+        ("Broken — installation fails", BROKEN),
+        ("Unreachable — network error, status unknown", ("unreachable",)),
+        ("Undeclared upstream skills", ("new-skill",)),
+        ("Updates available", ("outdated",)),
+        ("Unpinned", ("unpinned",)),
+    ]
+    for title, statuses in sections:
+        rows = [(r, i) for r in results for i in r["issues"] if i["status"] in statuses]
+        if not rows:
+            continue
+        out += [f"### {title} ({len(rows)})", "", "| Status | Entry | Detail |", "|---|---|---|"]
+        for r, i in sorted(rows, key=lambda x: (ORDER.index(x[1]["status"]), x[0]["id"])):
+            detail = i["detail"].replace("|", "\\|")
+            out.append(f"| `{i['status']}` | [{r['kind']}/{r['id']}]({r['url']}) | {detail} |")
+        out.append("")
+    ok = sorted(r["id"] for r in results if worst(r) == ORDER.index("ok"))
+    if ok:
+        out += [f"<details><summary>OK ({len(ok)})</summary>", "", ", ".join(f"`{i}`" for i in ok), "", "</details>"]
+    return "\n".join(out)
+
+
+def main(argv: list[str] | None = None) -> int:
+    parser = argparse.ArgumentParser(description=__doc__.splitlines()[0])
+    parser.add_argument("ids", nargs="*", help="entry IDs to check (default: every external entry)")
+    parser.add_argument("--format", choices=("text", "markdown", "json"), default="text")
+    parser.add_argument("--jobs", type=int, default=8, help="parallel upstream checks")
+    args = parser.parse_args(argv)
+
+    paths = [p for kind in KINDS for p in sorted((REPO_ROOT / kind).glob("*/entry.json"))]
+    if args.ids:
+        paths = [p for p in paths if p.parent.name in set(args.ids)]
+        missing = set(args.ids) - {p.parent.name for p in paths}
+        if missing:
+            print(f"unknown entry id(s): {', '.join(sorted(missing))}", file=sys.stderr)
+            return 2
+
+    with ThreadPoolExecutor(max_workers=max(1, args.jobs)) as pool:
+        results = list(pool.map(check_entry, paths))
+
+    if args.format == "json":
+        print(json.dumps(results, ensure_ascii=False, indent=2))
+    elif args.format == "markdown":
+        print(render_markdown(results))
+    else:
+        print(render_text(results))
+    return 1 if any(i["status"] in BROKEN for r in results for i in r["issues"]) else 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

scripts/catalog/test_check_upstream_health.py

@@ -0,0 +1,119 @@
+#!/usr/bin/env -S uv run --script
+# /// script
+# requires-python = ">=3.10"
+# dependencies = ["pyyaml>=6.0"]
+# ///
+"""Unit tests for the upstream health check, using local Git repositories."""
+
+from __future__ import annotations
+
+import importlib.util
+import json
+import subprocess
+import sys
+import tempfile
+import unittest
+from pathlib import Path
+
+
+CHECKER_PATH = Path(__file__).with_name("check_upstream_health.py")
+SPEC = importlib.util.spec_from_file_location("market_upstream_health", CHECKER_PATH)
+assert SPEC is not None and SPEC.loader is not None
+CHECKER = importlib.util.module_from_spec(SPEC)
+sys.modules[SPEC.name] = CHECKER
+SPEC.loader.exec_module(CHECKER)
+
+
+def sh(*args: str, cwd: Path) -> str:
+    return subprocess.run(args, cwd=cwd, check=True, capture_output=True, text=True).stdout.strip()
+
+
+class UpstreamHealthTests(unittest.TestCase):
+    def setUp(self) -> None:
+        self.tmp = tempfile.TemporaryDirectory()
+        self.root = Path(self.tmp.name)
+        self.upstream = self.root / "upstream"
+        self.upstream.mkdir()
+        sh("git", "init", "--quiet", "-b", "main", cwd=self.upstream)
+        for key, value in (("user.name", "t"), ("user.email", "t@example.com"),
+                           ("uploadpack.allowFilter", "true"),
+                           ("uploadpack.allowAnySHA1InWant", "true")):
+            sh("git", "config", key, value, cwd=self.upstream)
+        self.first = self.commit({"skills/alpha/SKILL.md": "---\nname: alpha\ndescription: A.\n---\n"})
+        self.url = self.upstream.as_uri()
+        self.catalog = self.root / "catalog"
+
+    def tearDown(self) -> None:
+        self.tmp.cleanup()
+
+    def commit(self, files: dict[str, str]) -> str:
+        for rel, text in files.items():
+            path = self.upstream / rel
+            path.parent.mkdir(parents=True, exist_ok=True)
+            path.write_text(text, encoding="utf-8")
+        sh("git", "add", "-A", cwd=self.upstream)
+        sh("git", "commit", "--quiet", "-m", "c", cwd=self.upstream)
+        return sh("git", "rev-parse", "HEAD", cwd=self.upstream)
+
+    def entry(self, **source) -> Path:
+        base = {"kind": "git", "repoUrl": self.url, "repoBranch": "main"}
+        data = {"id": "demo", "source": {**base, **source}}
+        children = data["source"].pop("children", None)
+        if children is not None:
+            data["children"] = children
+        path = self.catalog / "skills" / "demo" / "entry.json"
+        path.parent.mkdir(parents=True, exist_ok=True)
+        path.write_text(json.dumps(data), encoding="utf-8")
+        return path
+
+    def statuses(self, path: Path) -> dict[str, str]:
+        return {i["status"]: i["detail"] for i in CHECKER.check_entry(path)["issues"]}
+
+    def test_pinned_head_with_valid_path_is_ok(self) -> None:
+        result = self.statuses(self.entry(ref=self.first, path="skills/alpha"))
+        self.assertEqual(result, {"ok": ""})
+
+    def test_missing_repository_is_gone(self) -> None:
+        result = self.statuses(self.entry(repoUrl=(self.root / "missing").as_uri()))
+        self.assertIn("gone", result)
+
+    def test_missing_branch_is_bad_branch(self) -> None:
+        result = self.statuses(self.entry(repoBranch="release", ref=self.first))
+        self.assertIn("bad-branch", result)
+
+    def test_moved_skill_is_bad_path(self) -> None:
+        result = self.statuses(self.entry(ref=self.first, path="alpha"))
+        self.assertIn("bad-path", result)
+
+    def test_newer_head_is_outdated(self) -> None:
+        self.commit({"README.md": "x"})
+        result = self.statuses(self.entry(ref=self.first, path="skills/alpha"))
+        self.assertIn("outdated", result)
+        self.assertNotIn("bad-ref", result)
+
+    def test_unfetchable_ref_is_bad_ref(self) -> None:
+        result = self.statuses(self.entry(ref="0" * 40, path="skills/alpha"))
+        self.assertIn("bad-ref", result)
+
+    def test_unpinned_entry_is_reported(self) -> None:
+        result = self.statuses(self.entry(path="skills/alpha"))
+        self.assertIn("unpinned", result)
+
+    def test_collection_reports_missing_and_new_children(self) -> None:
+        head = self.commit({"skills/beta/SKILL.md": "---\nname: beta\ndescription: B.\n---\n"})
+        children = [{"id": "alpha", "path": "skills/alpha"}, {"id": "gamma", "path": "skills/gamma"}]
+        result = self.statuses(self.entry(ref=head, children=children))
+        self.assertIn("gamma", result["bad-path"])
+        self.assertEqual(result["new-skill"], "skills/beta")
+
+    def test_markdown_groups_broken_entries_first(self) -> None:
+        results = [
+            {"id": "a", "kind": "skill", "url": "u", "issues": [{"status": "outdated", "detail": "x"}]},
+            {"id": "b", "kind": "skill", "url": "u", "issues": [{"status": "gone", "detail": "y"}]},
+        ]
+        text = CHECKER.render_markdown(results)
+        self.assertLess(text.index("Broken"), text.index("Updates available"))
+
+
+if __name__ == "__main__":
+    unittest.main()