CtrlK
BlogDocsLog inGet started
Tessl Logo
SkillPublic

plugin-builder

Automate Claude Code plugin creation, packaging, validation, and distribution. Use when creating plugins, packaging skills, generating manifests, validating plugin structure, setting up marketplaces, or distributing skill collections.

Quality

76%

Does it follow best practices?

Run evals on this skill

Adds up to 20 points to the overall score

View guide
SecuritybySnyk

Passed

No findings from the security scan

Fix and improve this skill with Tessl

tessl review fix ./skills/plugin-builder/SKILL.md
SKILL.md
Quality
Evals
Security

Quality

Content

62%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

The body delivers genuinely actionable, well-sequenced workflows with strong validation feedback loops — its strongest qualities. But it is roughly three times longer than needed due to duplicated content and padding, and several See Also links point to files that don't exist in the bundle, undermining both token efficiency and navigation.

Suggestions

Deduplicate repeated content: keep one copy each of the plugin structure diagram, plugin.json examples, and allowed-tools tool-set lists (point the repeats at references/plugin-json-schema.md and references/validation-rules.md instead), and delete the marketing ('Time Savings'), conceptual ('What Are Claude Code Plugins?'), and 'Next Steps After MVP' sections — this alone would roughly halve the body.

Fix or remove the four broken bundle references: references/distribution-guide.md, references/component-packaging-guide.md, templates/*, and scripts/generate_marketplace.py (Operation 3's primary method depends on a script that isn't shipped).

Remove context that only matters to the original author, e.g., 'Skills: Agent capabilities (what we have 32 of!)' and the skrillz-ecosystem example's '32 skills' — a skill consumer has a different, unknown skill count.

DimensionReasoningScore

Conciseness

The ~1400-line body is noticeably verbose with substantial duplication: the plugin structure diagram appears three times (What Are Plugins, Operation outputs, Quick Reference), plugin.json examples appear three times, and the allowed-tools 'common tool sets' list is repeated in Operation 5, Best Practices, and Quick Reference. It also pads with marketing ('Time Savings: 2-4 hours manual work → 15-30 minutes automated'), self-referential author context ('Skills: Agent capabilities (what we have 32 of!)'), a non-instructional 'Next Steps After MVP' roadmap, and explanations of things Claude already knows (trailing commas in JSON, kebab-case explained four times).

2 / 5

Actionability

Mostly executable guidance: every operation gives concrete copy-paste commands (e.g., 'python scripts/validate_plugin.py /path/to/my-plugin --check 2025'), full worked-example transcripts, and error→fix pairs. It falls short of 5 because scripts/generate_marketplace.py — the primary method for Operation 3, invoked repeatedly — does not exist in the bundle, and command paths use placeholders ('/path/to/plugin-builder/scripts/...') requiring the user to resolve them.

4 / 5

Workflow Clarity

Each of the five operations follows a clear purpose/when-to-use/prerequisites/inputs/process/outputs structure with explicit validation checkpoints, and the batch packaging operation includes a full feedback loop (validate → report warnings with exact fixes → re-package → re-validate). The validation operation documents exit codes, per-category checklists, and common errors with fixes, and the Quick Reference's Distribution Workflow sequences creation → validation → marketplace → push → install.

5 / 5

Progressive Disclosure

Structure exists and references are clearly signaled via per-operation 'See Also' sections one level deep (references/plugin-json-schema.md, marketplace-json-schema.md, validation-rules.md all exist). However, large amounts of detail that belongs in those reference files are inlined and repeated (three full plugin.json examples, full marketplace.json examples, the schema field walkthroughs), and four referenced paths are broken: references/distribution-guide.md, references/component-packaging-guide.md, the entire templates/ directory, and scripts/generate_marketplace.py. This mix of good signaling with heavy inlining and dead links sits between the 2 and 4 anchors.

3 / 5

Total

14

/

20

Passed

Description

83%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A strong description that clearly and explicitly states both what the skill does and when to use it, with natural, varied trigger phrases covering the full operation set. The only gaps are minor: action verbs remain somewhat generic and a few common synonyms (publish, share) are absent.

DimensionReasoningScore

Specificity

The description lists several specific actions ('creation, packaging, validation, and distribution', 'generating manifests', 'validating plugin structure', 'setting up marketplaces'), giving broad capability coverage. It falls short of a 5 because the actions stay at the verb level without concrete file- or artifact-level specifics (e.g., plugin.json, marketplace.json) that would make coverage fully comprehensive.

4 / 5

Completeness

It explicitly answers both questions: 'what' ('Automate Claude Code plugin creation, packaging, validation, and distribution') and 'when' ('Use when creating plugins, packaging skills, generating manifests, validating plugin structure, setting up marketplaces, or distributing skill collections') with concrete trigger phrases, matching the top anchor exactly.

5 / 5

Trigger Term Quality

Trigger phrases are natural and well-varied ('creating plugins', 'packaging skills', 'generating manifests', 'setting up marketplaces', 'distributing skill collections') — phrasings a user would plausibly say. A few common synonyms are missing (e.g., 'publish', 'share skills', 'plugin.json', 'marketplace'), keeping it below a 5.

4 / 5

Distinctiveness Conflict Risk

The Claude Code plugin packaging/distribution niche is distinct with dedicated triggers (manifests, marketplaces, plugin validation). 'Packaging skills' creates minor overlap risk with general skill-authoring skills, so it is mostly rather than fully distinct.

4 / 5

Total

17

/

20

Passed

Validation

75%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation — 12 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

skill_md_line_count

SKILL.md is long (1432 lines); consider splitting into references/ and linking

Warning

allowed_tools_field

'allowed-tools' contains unusual tool name(s)

Warning

relative_links

Relative link issues: 7 missing

Warning

referenced_paths_exist

Referenced path issues: 10 missing

Warning

Total

12

/

16

Passed

Repository

fernandezbaptiste/Skrillz

Path

skills/plugin-builder/SKILL.md

Reviewed

Table of Contents

Is this your skill?

If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.