Plugin Validator Findings Investigation

Plugin Validator Findings Investigation

Summary

• SK005 — Mixed. The validator logic is sound (it is a warning, not an error), but the required trigger phrase list is too narrow. Several affected descriptions convey intent clearly without matching the exact literal phrases. At least 3 of the 9 files examined have descriptions that communicate trigger context effectively — the rule should accept a wider vocabulary or use semantic matching.
• SK006 — Real Issue. Token counts above 4400 indicate genuinely large skills. The warning is appropriate given the validator's documented rationale (comparing against Anthropic's official skill sizes). No linter bug.
• SK007 — Real Issue for orchestrating-swarms (12453 tokens). For claude-hooks-reference-2026 (9054 tokens), it is borderline — the content is intentional reference material, but the threshold is still architecturally valid.
• LK001 — Mixed. perl-testing/references/mock-patterns.md, brainstorming-skill/references/geeky-gadgets.md, and agent-browser references/templates: real content issues (files do not exist). The .claude/skills/*/ links using ./../knowledge/... pattern: real content issues caused by incorrect path depth — the files exist but the links resolve one level too shallow. The claude-hooks-reference-2026 link to ../claude-skills-reference-2026/SKILL.md: real content issue — the directory was renamed to claude-skills-overview-2026.
• LK002 — Real Issue enforcing a style preference that matters. Links without ./ prefix resolve correctly in practice, but the validator correctly enforces the stated project convention. The agentskills and agent-browser links that lack ./ also lack the referenced files entirely, making them LK001 errors too.

Overall: 2 real issues, 2 mixed, 1 borderline — no outright linter bugs.

SK005 — Description Missing Trigger Phrases

Files Examined

1. plugins/python3-development/skills/development/implement-feature/SKILL.md

   description: Execute a SAM task plan (plan/tasks-*.md) by looping ready tasks,
   delegating each task to its specified agent, and relying on hooks to update task
   timestamps/status.
   

2. plugins/plugin-creator/skills/refactor-plugin/SKILL.md

   description: Start a complete plugin refactoring workflow. Analyzes plugin structure,
   creates refactoring plan with tasks, and guides through execution.
   

3. .claude/skills/work-backlog-item/SKILL.md

   description: "Bridges BACKLOG.md to the SAM planning pipeline — no args shows
   interactive backlog browser with grooming status; with args finds item by title
   substring, auto-grooms if needed, runs RT-ICA to BLOCK on missing inputs before
   SAM planning, invokes add-new-feature, then updates backlog with plan reference.
   STOPS if item already has a Plan field or RT-ICA returns BLOCKED."
   

4. plugins/plugin-creator/skills/arl/SKILL.md

   description: Knowledge reference for Autonomous Refinement Loop research — pattern
   research into prerequisites for autonomous execution without synchronous human
   blocking gates.
   

5. .claude/skills/commit-staged/SKILL.md

   description: Generate descriptive commit messages by analyzing git diffs, very fast
   and context pollution safe. Use on any request to commit staged changes.
   

6. .claude/skills/subagent-contract/SKILL.md

   description: Global contract for all specialist subagents. Enforces role boundaries,
   scope discipline, and DONE/BLOCKED status signaling. Load this skill in any agent
   that should operate as a bounded specialist following supervisor delegation patterns.
   

Validator Logic (file:line)

Source: plugins/plugin-creator/scripts/plugin_validator.py, lines 68-76 and 1947-1964.

REQUIRED_TRIGGER_PHRASES = [
    "use when",
    "use this",
    "used when",
    "used by",
    "when ",
    "trigger",
    "activate",
]

The check (lines 1950-1952) lowercases the description and looks for any of these exact substrings. It fires a warning (not an error). The check applies only to FileType.SKILL files (line 1948).

Verdict: Mixed

The rule design is reasonable — trigger phrases make skills more discoverable by the orchestrator. The severity (warning) is appropriate.

However, the trigger phrase list is too narrow:

• commit-staged description contains "Use on any request" — this is a clear trigger phrase but does not match any of the 7 literals. This is a false positive from the linter.
• work-backlog-item description contains "no args shows..." and "with args finds" — behavioral triggers clearly present, but no literal match.
• subagent-contract description contains "Load this skill in any agent" — functional trigger, not captured.
• refactor-plugin description says "Start a complete plugin refactoring workflow" — imperative trigger implied, not matched.
• arl and implement-feature descriptions are genuinely weak on trigger context. Real issues.

The rule misses trigger intent expressed through other vocabulary: "load this skill", "on any request", "use on".

Evidence

• commit-staged: Contains "Use on any request" — functionally identical to "use when" but not matched by the literal check. False positive.
• subagent-contract: Contains "Load this skill in any agent" — clear load trigger not in phrase list. False positive.
• arl: No trigger phrase present. Real issue — description reads as a content summary, not a usage trigger.
• implement-feature: No trigger phrase. Real issue — describes what it does, not when to invoke it.

SK006 — Skill Body Large (Warning)

Verdict: Real Issue

SK006 is a warning at TOKEN_WARNING_THRESHOLD = 4400 tokens (body content only, frontmatter excluded). The validator comment states this threshold is derived from Anthropic's official skill sizes.

Evidence

Source: plugin_validator.py lines 48-49, 2087-2098.

TOKEN_WARNING_THRESHOLD = 4400
TOKEN_ERROR_THRESHOLD = 8800

Warning message: "This skill is larger than Anthropic's official skills. Review whether content can be moved to references/ or if the skill covers multiple domains that could be separated."

This is actionable architectural guidance. Skills exceeding 4400 body tokens should be reviewed for content that can move to references/ files or split into sub-skills. Not a linter bug — valid warning.

SK007 — Skill Body Exceeds Token Limit (Error)

Files Affected

• .claude/skills/orchestrating-swarms/SKILL.md — 12453 tokens (42% over 8800 limit)
• plugins/plugin-creator/skills/claude-hooks-reference-2026/SKILL.md — 9054 tokens (3% over 8800 limit)

Verdict: Real Issue

Source: plugin_validator.py lines 48-49, 2077-2086.

The error threshold TOKEN_ERROR_THRESHOLD = 8800 represents a hard architectural limit with the suggestion to split. Both files genuinely exceed it.

orchestrating-swarms at 12453 tokens is significantly over — clear split candidate.

claude-hooks-reference-2026 at 9054 tokens is marginally over, and its content is intentional reference documentation. The threshold is still valid: reference material of this density should be distributed across references/ files instead of embedded in the SKILL.md body. The validator's suggestion ("Run /plugin-creator:refactor-skill") is appropriate.

Neither finding is a linter bug.

LK001 — Broken Internal Links

Files Examined

Group A — Genuinely missing files:

• plugins/perl-development/skills/perl-testing/SKILL.md → ./references/mock-patterns.md

  • Verified: plugins/perl-development/skills/perl-testing/references/ contains no files (Glob returned no results).
  • Verdict: Real content issue. The file was never created or was deleted.

• plugins/brainstorming-skill/skills/brainstorming-skill/SKILL.md → ./references/geeky-gadgets.md

  • Verified: plugins/brainstorming-skill/skills/brainstorming-skill/references/ contains no files.
  • Verdict: Real content issue. The references directory and files do not exist.

• .claude/skills/agent-browser/SKILL.md → 9 broken links (references/.md and templates/.sh)

  • Verified: .claude/skills/agent-browser/references/ and templates/ contain no files (Glob returned no results).
  • Verdict: Real content issue. References and templates directories do not exist.

Group B — Incorrect path depth from .claude/skills/*/ to .claude/knowledge/:

• .claude/skills/verify/SKILL.md → ./../knowledge/workflow-diagrams/master-workflow.md

• .claude/skills/subagent-contract/SKILL.md → ./../knowledge/workflow-diagrams/multi-agent-orchestration.md

• .claude/skills/scientific-thinking/SKILL.md → ./../knowledge/workflow-diagrams/investigation-workflow.md

• .claude/skills/agent-creator/SKILL.md → ./../knowledge/workflow-diagrams/asset-decision-tree.md

  Path resolution test (Python):

  skill_dir = /home/ubuntulinuxqa2/repos/claude_skills/.claude/skills/subagent-contract
  link = ./../knowledge/workflow-diagrams/multi-agent-orchestration.md
  resolved = /home/ubuntulinuxqa2/repos/claude_skills/.claude/skills/knowledge/workflow-diagrams/multi-agent-orchestration.md
  exists = False
  
  correct = /home/ubuntulinuxqa2/repos/claude_skills/.claude/knowledge/workflow-diagrams/multi-agent-orchestration.md
  correct.exists = True
  

  The path ./../ from .claude/skills/subagent-contract/ navigates to .claude/skills/ (not .claude/). To reach .claude/knowledge/, the correct path is ../../knowledge/workflow-diagrams/multi-agent-orchestration.md.

  All four workflow-diagram target files verified to exist at the correct absolute paths.

  Verdict: Real content issue — incorrect path depth. The links use one too few ../ levels. The linter correctly reports broken links. Fix: change ./../knowledge/ to ../../knowledge/ in all four files.

Group C — Renamed/moved directory:

• plugins/plugin-creator/skills/claude-hooks-reference-2026/SKILL.md → ../claude-skills-reference-2026/SKILL.md
  • Verified: No directory named claude-skills-reference-2026 exists in plugins/plugin-creator/skills/. The directory claude-skills-overview-2026 exists.
  • Verdict: Real content issue. Directory was renamed from claude-skills-reference-2026 to claude-skills-overview-2026. The link was not updated.

Validator Logic (file:line)

Source: plugin_validator.py, lines 614-629.

skill_dir = path.parent
link_path = (skill_dir / link_url_no_fragment).resolve()
if not link_path.exists():
    errors.append(ValidationIssue(..., code=LK001))

The validator resolves links relative to the SKILL.md's parent directory, strips anchor fragments before checking, and reports an error if the resolved path does not exist. Logic is correct.

The _should_ignore_link method (lines 662-680) ignores HTTP/HTTPS/FTP external links, anchor-only links (#), and absolute paths (/). It does NOT ignore ../ relative paths. This is correct behavior — ../ links should be validated.

Verdict: Real Issue (all cases)

No linter bugs found in LK001. All reported broken links reflect genuine missing or mis-pathed files.

LK002 — Link Missing ./ Prefix

Files Examined

• plugins/plugin-creator/skills/agentskills/SKILL.md — 4 links without ./ prefix:

  • ../claude-skills-overview-2026/SKILL.md (2 occurrences)
  • references/forms.md
  • references/api.md
  • references/redlining.md
  • references/best-practices.md
  • references/specification.md
  • references/integration.md

• .claude/skills/agent-browser/SKILL.md — 9 links without ./ prefix (all references and templates)

Validator Logic (file:line)

Source: plugin_validator.py, lines 596-608.

if not link_url.startswith("./") and not link_url.startswith("../"):
    warnings.append(ValidationIssue(..., code=LK002, severity="warning"))

Links using ../ are NOT flagged for LK002 — only links starting with neither ./ nor ../. This means bare relative links like references/file.md trigger LK002 but ../sibling/SKILL.md does not.

Verdict: Real Issue (as a style enforcement warning)

The severity is warning (not error), which is appropriate. Links without ./ prefix will resolve correctly at the filesystem level (path resolution works the same), so these are not broken links. They violate the project convention documented in CLAUDE.md:

"Use markdown links with relative paths starting with ./"

For agentskills, the references/*.md links that lack ./ also lack the underlying files — these are already LK001 errors too.

For agent-browser, same situation — the 9 links without ./ prefix also point to non-existent files (already LK001 errors).

The LK002 warning is a style/convention enforcement finding and is doing its job correctly. No linter bug.

Recommendations

SK005 — Expand the trigger phrase list

Action: Fix the linter. Add more natural trigger vocabulary to REQUIRED_TRIGGER_PHRASES in plugin_validator.py:

REQUIRED_TRIGGER_PHRASES = [
    "use when",
    "use this",
    "use on",        # catches "Use on any request"
    "used when",
    "used by",
    "when ",
    "trigger",
    "activate",
    "load this",     # catches "Load this skill in any agent"
    "load when",
    "invoke",
    "invoked",
]

Also fix the files: arl/SKILL.md and implement-feature/SKILL.md descriptions lack genuine trigger context and should have trigger phrases added regardless of the phrase list.

SK006 — No action needed on the linter

Review affected skills individually. Move content to references/ or split as appropriate. The warning is correctly calibrated.

SK007 — Fix the files, not the linter

• .claude/skills/orchestrating-swarms/SKILL.md: Split into sub-skills or move content to references/. 12453 tokens is well above the threshold.
• plugins/plugin-creator/skills/claude-hooks-reference-2026/SKILL.md: Move dense reference tables to references/ files and link from SKILL.md body. 9054 tokens at 3% over threshold — a modest restructuring would resolve it.

LK001 — Fix the files

Four distinct fixes needed:

1. perl-testing: Create plugins/perl-development/skills/perl-testing/references/mock-patterns.md or remove the link.
2. brainstorming-skill: Create plugins/brainstorming-skill/skills/brainstorming-skill/references/geeky-gadgets.md or remove the link.
3. agent-browser: Create the 9 referenced references/*.md and templates/*.sh files or remove/update the links.
4. verify, subagent-contract, scientific-thinking, agent-creator: Change ./../knowledge/workflow-diagrams/ to ../../knowledge/workflow-diagrams/ in all four SKILL.md files.
5. claude-hooks-reference-2026: Change ../claude-skills-reference-2026/SKILL.md to ../claude-skills-overview-2026/SKILL.md.

LK002 — Fix the files (style)

Add ./ prefix to bare relative links in agentskills/SKILL.md and agent-browser/SKILL.md. Note that most of these links also need LK001 fixes (missing files) — the ./ prefix fix alone is insufficient.

Investigation date: 2026-02-18. No files modified during investigation.