refactor(skill): SKILL.md-relative path resolver, drop Codex native plugin

STEP 0 (CANONICAL PATH SELF-CHECK) used to force any SKILL.md load that wasn't
under $HOME/.claude/plugins/cache/last30days-skill/last30days/{version}/ to
re-Read from there. That guard is Claude-Code-specific (defends against the
marketplaces/ stale-clone bug) and broke under non-Claude installers like
`npx skills add`, ~/.codex/skills/, and ~/.agents/skills/.

The new STEP 0 narrows the check to its actual target: fire only when the
loaded SKILL.md path contains /.claude/plugins/marketplaces/. Every other
install path is trusted. The 2026-04-22 incident workaround is preserved
without breaking other harnesses.

Step 1 SKILL_ROOT resolver collapses the Codex-first / Claude-fallback /
CWD-fallback chain into a single precedence walk: Claude plugin cache
(versioned) first, then ~/.codex/skills, ~/.agents/skills, repo checkout,
./.skills/last30days (npx skills install dir), CWD, and GEMINI_EXTENSION_DIR.

Also drops Codex native plugin support: .codex-plugin/plugin.json is deleted,
the badge VERSION jq fallback in line 108 stops looking at it, and render.py's
_skill_version no longer scans for it. Codex users install via `npx skills add`
or the per-harness skill dir going forward.

render.py::_skill_version gains a SKILL.md frontmatter fallback so the badge
no longer emits `v?` on install dirs that sync.sh populates (which don't
include .claude-plugin/plugin.json).

.codex-plugin/plugin.json

@@ -1,43 +0,0 @@
-{
-  "name": "last30days",
-  "version": "3.2.1",
-  "description": "Research any topic across Reddit, X, YouTube, TikTok, Instagram, Hacker News, Polymarket, GitHub, and 5+ more sources. AI agent scores by upvotes, likes, and real money - not editors.",
-  "author": {
-    "name": "Matt Van Horn",
-    "email": "mvanhorn@gmail.com",
-    "url": "https://github.com/mvanhorn"
-  },
-  "homepage": "https://github.com/mvanhorn/last30days-skill",
-  "repository": "https://github.com/mvanhorn/last30days-skill",
-  "license": "MIT",
-  "keywords": [
-    "research",
-    "reddit",
-    "twitter",
-    "youtube",
-    "tiktok",
-    "instagram",
-    "trends",
-    "polymarket",
-    "github",
-    "hacker-news"
-  ],
-  "skills": "./skills/",
-  "interface": {
-    "displayName": "Last 30 Days",
-    "shortDescription": "Research recent discussion across social and web sources",
-    "longDescription": "Research any topic across Reddit, X, YouTube, TikTok, Instagram, Hacker News, Polymarket, GitHub, and 5+ more sources. AI agent scores by upvotes, likes, and real money - not editors.",
-    "developerName": "Matt Van Horn",
-    "category": "Research",
-    "capabilities": [
-      "Interactive",
-      "Read",
-      "Write"
-    ],
-    "websiteURL": "https://github.com/mvanhorn/last30days-skill",
-    "privacyPolicyURL": "https://docs.github.com/en/site-policy/privacy-policies/github-general-privacy-statement",
-    "termsOfServiceURL": "https://docs.github.com/en/site-policy/github-terms/github-terms-of-service",
-    "defaultPrompt": "Use Last 30 Days to research this topic from the last 30 days across Reddit, X, YouTube, and web.",
-    "brandColor": "#FF6B35"
-  }
-}

skills/last30days/SKILL.md

@@ -60,23 +60,22 @@ metadata:
       - clawhub
 ---
 
-# STEP 0: CANONICAL PATH SELF-CHECK — RUN BEFORE READING BELOW
+# STEP 0: STALE-CLONE SELF-CHECK — RUN BEFORE READING BELOW
 
-Before reading anything else in this file, verify that the SKILL.md you just loaded is the versioned cache copy, not a stale marketplace clone:
+Before reading anything else in this file, check whether you loaded SKILL.md from the one known stale-clone location: Claude Code's marketplaces directory.
+
+**Run this check:**
 
 ```bash
-CANONICAL_ROOT="$HOME/.claude/plugins/cache/last30days-skill/last30days"
-CANONICAL_LATEST=$(ls -d "$CANONICAL_ROOT"/*/ 2>/dev/null | sort -V | tail -1)
-CANONICAL_LATEST="${CANONICAL_LATEST%/}"
+CLAUDE_CACHE_LATEST=$(ls -d "$HOME/.claude/plugins/cache/last30days-skill/last30days"/*/ 2>/dev/null | sort -V | tail -1)
+CLAUDE_CACHE_LATEST="${CLAUDE_CACHE_LATEST%/}"
 ```
 
-If the SKILL.md file you just read is NOT under `$CANONICAL_LATEST/`, STOP and re-read `$CANONICAL_LATEST/SKILL.md` before proceeding. Do not run `--help`, do not plan, do not invoke the engine against any other path.
+If the SKILL.md path you just Read contains `/.claude/plugins/marketplaces/` AND `$CLAUDE_CACHE_LATEST` is non-empty, STOP and re-read `$CLAUDE_CACHE_LATEST/skills/last30days/SKILL.md` before proceeding. Otherwise the SKILL.md you have is fine — continue.
 
-**Why:** `~/.claude/plugins/marketplaces/last30days-skill/` is a git clone Claude Code auto-restores to `origin/main` on session start. It can lag the versioned cache by one or more releases. Three 2026-04-22 test runs (Linear, Coinbase) loaded SKILL.md from `marketplaces/`, ran `--help` from the same stale path, did not see the `--competitors` flag that existed in the cache, and fell back to a manual comparison plan. Result: 2 of 3 windows never invoked the feature they were asked to test.
+**Why this specific check:** `~/.claude/plugins/marketplaces/last30days-skill/` is a git clone Claude Code auto-restores to `origin/main` on session start. It can lag the versioned cache by one or more releases. Three 2026-04-22 test runs (Linear, Coinbase) loaded SKILL.md from `marketplaces/`, ran `--help` from the same stale path, did not see the `--competitors` flag that existed in the cache, and fell back to a manual comparison plan. Result: 2 of 3 windows never invoked the feature they were asked to test. STEP 0 defends against that one Claude Code-specific bug.
 
-**How to self-check:** the file path you used in your last Read tool call should match `$CANONICAL_LATEST/SKILL.md`. If it contains `marketplaces/` or any other prefix, that is the stale-path failure mode. Re-read from `$CANONICAL_LATEST/SKILL.md` and restart this contract from the top.
-
-The same pinned resolver appears later in Step 1 for the engine Bash invocation. That guard is necessary but insufficient — by the time you reach Step 1, you may have already internalized an out-of-date flag list from the stale SKILL.md above it. This STEP 0 runs first so the CONTRACT itself is read from the right file.
+**Other install paths are fine:** `~/.codex/skills/`, `~/.agents/skills/`, an `npx skills add` install dir, or a repo checkout are all valid load points - the resolver in Step 1 picks them up. Do NOT abort or hop on those paths.
 
 ---
 
@@ -88,7 +87,7 @@ You are inside the `/last30days` SKILL. This is a specific research tool with a
 
 **How v3.0.7 fixes it:** three structural anchors.
 1. **The MANDATORY first-line badge** (`🌐 last30days v{VERSION} · synced {YYYY-MM-DD}`) at the top of every response is the LAW 2 / LAW 4 enforcement anchor. See "BADGE (MANDATORY, FIRST LINE OF OUTPUT)" in the synthesis section.
-2. **The pinned SKILL_ROOT resolution** in the engine Bash calls always points to the public plugin cache, never `~/.openclaw/` or other stale copies.
+2. **The SKILL_ROOT resolver** in the engine Bash calls walks a precedence list of known install locations and picks the highest-versioned freshest copy, never `~/.openclaw/` or other stale copies.
 3. **This preface** tells you plainly: do NOT improvise. Follow SKILL.md top to bottom.
 
 If you catch yourself about to write a `##` section header in a GENERAL-query body, a custom title line, a `Sources:` bullet list, a `for dir in ...` path-discovery loop, or a bare `python3 scripts/last30days.py "{TOPIC}"` engine call with no pre-flight flags — stop. Those are the exact failure modes the LAWs and this contract exist to prevent. The 10/10 beta validation from 2026-04-18 and the 0/8 public v3.0.6 regression from the same day had THE SAME MODEL and SIMILAR SKILL.md CONTENT; the delta is the three anchors this release restores. Read SKILL.md top to bottom before emitting your first response.
@@ -105,7 +104,7 @@ These anchors used to live at line 1094 of this file. Three independent Opus 4.7
 🌐 last30days v{VERSION} · synced {YYYY-MM-DD}
 ```
 
-Replace `{VERSION}` with the installed plugin version (`jq -r '.version' "$SKILL_ROOT/../../.codex-plugin/plugin.json" 2>/dev/null || jq -r '.version' "$SKILL_ROOT/.claude-plugin/plugin.json"`) and `{YYYY-MM-DD}` with today's date. No other text on this line. One blank line after, then the synthesis begins.
+Replace `{VERSION}` with the installed plugin version (`jq -r '.version' "$SKILL_ROOT/../../.claude-plugin/plugin.json" 2>/dev/null || awk '/^version:/{gsub(/"/,"",$2); print $2; exit}' "$SKILL_ROOT/SKILL.md"`) and `{YYYY-MM-DD}` with today's date. No other text on this line. One blank line after, then the synthesis begins.
 
 **Why the badge is MANDATORY:** it is the structural anchor for the canonical output shape. Without it the model drifts into blog-post narrative format with `##` section headers and invented titles, violating LAW 2 and LAW 4. The 2026-04-18 public v3.0.6 0/8 regression produced outputs with section headers like "The headline", "Why he is everywhere", "1. gstack dominates", "The 'Homecoming' peak". Direct cause: this anchor was absent. Do NOT skip the badge. Do NOT describe it. Do NOT paraphrase it. Emit it verbatim as line 1.
 
@@ -869,14 +868,12 @@ Store your plan as `QUERY_PLAN_JSON` - you'll pass it to the script in the next
 **IMPORTANT: Include `--x-handle={RESOLVED_HANDLE}` in the command. For comparison mode: Pass `--x-handle={TOPIC_A_HANDLE}` to the first pass, `--x-handle={TOPIC_B_HANDLE}` to the second pass, and both to the head-to-head pass. Also include `--subreddits={RESOLVED_SUBREDDITS}`, `--tiktok-hashtags={RESOLVED_HASHTAGS}`, `--tiktok-creators={RESOLVED_TIKTOK_CREATORS}`, and `--ig-creators={RESOLVED_IG_CREATORS}` from Step 0.55. Omit any flag where the value was not resolved (empty).**
 
 ```bash
-# PIN SKILL_ROOT to an installed plugin cache first (highest-version dir wins on upgrade).
-# Prefer Codex's skill package path when installed as a Codex plugin. Keep the Claude
-# plugin-root fallback for other hosts, then fall back to a repo checkout.
-SKILL_ROOT="$(ls -d "$HOME/.codex/plugins/cache/"*/last30days/*/skills/last30days/ 2>/dev/null | sort -V | tail -1)"
-SKILL_ROOT="${SKILL_ROOT%/}"
+# Resolve SKILL_ROOT by walking a precedence list of known install locations.
+# Claude Code plugin cache wins when present (highest version dir picked on upgrade),
+# then common per-harness skill dirs, then a repo checkout.
+SKILL_ROOT=""
 
-# Fallback for Claude plugin cache.
-if [ -z "$SKILL_ROOT" ] || [ ! -f "$SKILL_ROOT/scripts/last30days.py" ]; then
+# 1. Claude Code plugin cache (versioned). Both shapes ship in the wild — pick the freshest.
 CLAUDE_PLUGIN_ROOT="$(ls -d "$HOME/.claude/plugins/cache/last30days-skill/last30days/"*/ 2>/dev/null | sort -V | tail -1)"
 CLAUDE_PLUGIN_ROOT="${CLAUDE_PLUGIN_ROOT%/}"
 if [ -n "$CLAUDE_PLUGIN_ROOT" ]; then
@@ -886,19 +883,23 @@ if [ -z "$SKILL_ROOT" ] || [ ! -f "$SKILL_ROOT/scripts/last30days.py" ]; then
     SKILL_ROOT="$CLAUDE_PLUGIN_ROOT"
   fi
 fi
-fi
 
-# Fallback for repo checkout / Gemini / local development hosts where the plugin cache does not exist.
+# 2. Common per-harness skill dirs and repo checkout (npx skills, Codex, Agents, Gemini, etc).
 if [ -z "$SKILL_ROOT" ] || [ ! -f "$SKILL_ROOT/scripts/last30days.py" ]; then
-  for dir in "." "./skills/last30days" "${CLAUDE_PLUGIN_ROOT:-}" "${GEMINI_EXTENSION_DIR:-}"; do
+  for dir in \
+      "$HOME/.codex/skills/last30days" \
+      "$HOME/.agents/skills/last30days" \
+      "./skills/last30days" \
+      "./.skills/last30days" \
+      "." \
+      "${GEMINI_EXTENSION_DIR:-}"; do
     [ -n "$dir" ] && [ -f "$dir/scripts/last30days.py" ] && SKILL_ROOT="$dir" && break
   done
 fi
 
 if [ -z "${SKILL_ROOT:-}" ] || [ ! -f "$SKILL_ROOT/scripts/last30days.py" ]; then
-  echo "ERROR: Could not find scripts/last30days.py in Codex/Claude plugin cache or repo checkout" >&2
-  echo "Expected Codex: $HOME/.codex/plugins/cache/{MARKETPLACE}/last30days/{VERSION}/skills/last30days/scripts/last30days.py" >&2
-  echo "Expected Claude: $HOME/.claude/plugins/cache/last30days-skill/last30days/{VERSION}/skills/last30days/scripts/last30days.py" >&2
+  echo "ERROR: Could not find scripts/last30days.py in any known install location" >&2
+  echo "Searched: ~/.claude/plugins/cache/, ~/.codex/skills/, ~/.agents/skills/, ./skills/last30days, ./.skills/last30days, ." >&2
   exit 1
 fi
 

skills/last30days/scripts/lib/render.py

@@ -12,21 +12,30 @@ from . import dates, schema
 
 
 def _skill_version() -> str:
-    """Read plugin version from a plugin manifest if available.
+    """Read plugin version from .claude-plugin/plugin.json, falling back to SKILL.md frontmatter.
 
-    Tries nearest plugin.json by walking up from render.py's own location.
-    Falls back to "?" if not found. This keeps the badge emission from
-    crashing on non-plugin-cache installs (repo checkout, Gemini, Codex).
+    sync.sh does not copy .claude-plugin/ to non-cache install dirs (~/.codex/skills,
+    ~/.agents/skills, Hermes), so SKILL.md frontmatter is the fallback that keeps the
+    badge from emitting v? on those installs. Returns "?" only if both sources are missing.
     """
+    import re
+
     here = pathlib.Path(__file__).resolve()
-    for parent in [here.parent, *here.parents]:
-        for manifest_dir in (".codex-plugin", ".claude-plugin"):
-            candidate = parent / manifest_dir / "plugin.json"
-            if candidate.is_file():
+    for parent in here.parents:
+        manifest = parent / ".claude-plugin" / "plugin.json"
+        if manifest.is_file():
             try:
-                    return json.loads(candidate.read_text()).get("version", "?")
+                return json.loads(manifest.read_text()).get("version", "?")
             except (json.JSONDecodeError, OSError):
-                    return "?"
+                break
+
+    for parent in here.parents:
+        skill_md = parent / "SKILL.md"
+        if skill_md.is_file():
+            match = re.search(r'^version:\s*"([^"]+)"\s*$', skill_md.read_text(), re.MULTILINE)
+            if match:
+                return match.group(1)
+            break
     return "?"
 
 

tests/test_plugin_contract.py

@@ -22,20 +22,11 @@ def _skill_version() -> str:
 
 
 class TestPluginContract(unittest.TestCase):
-    def test_codex_manifest_points_at_skills_tree(self) -> None:
-        manifest = _json(ROOT / ".codex-plugin" / "plugin.json")
-
-        self.assertEqual("last30days", manifest["name"])
-        self.assertEqual("./skills/", manifest["skills"])
-        self.assertTrue(SKILL_ROOT.joinpath("SKILL.md").is_file())
-        self.assertTrue(SKILL_ROOT.joinpath("scripts", "last30days.py").is_file())
-
     def test_versions_match_across_manifests(self) -> None:
         pyproject = tomllib.loads((ROOT / "pyproject.toml").read_text(encoding="utf-8"))
         version = pyproject["project"]["version"]
 
         self.assertEqual(version, _skill_version())
-        self.assertEqual(version, _json(ROOT / ".codex-plugin" / "plugin.json")["version"])
         self.assertEqual(version, _json(ROOT / ".claude-plugin" / "plugin.json")["version"])
 
         marketplace = _json(ROOT / ".claude-plugin" / "marketplace.json")