CtrlK
BlogDocsLog inGet started
Tessl Logo

apply-anthropic-skill-best-practices

Comprehensive guide for skill development based on Anthropic's official best practices - use for complex skills requiring detailed structure

50

Quality

56%

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 ./antigravity/skills/apply-anthropic-skill-best-practices/SKILL.md

The canonical home for this skill is apply-anthropic-skill-best-practices in NeoLabHQ/context-engineering-kit

SKILL.md
Quality
Evals
Security

Quality

Content

56%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 is rich, accurate, and actionable with strong workflow and feedback-loop patterns, but it fails its own conciseness and progressive-disclosure guidance: it is roughly twice the recommended length and ships as a monolithic file with no reference bundles.

Suggestions

Trim the body under 500 lines by removing explanations of concepts Claude already knows (e.g., how the runtime environment loads files, the mechanics of progressive disclosure) and condensing the Claude A/Claude B iteration narrative.

Practice the progressive disclosure the skill teaches: move the long pattern showcases, the executable-code advanced section, and the checklist catalog into separate reference files (e.g. references/patterns.md, references/code-skills.md) linked one level deep from SKILL.md.

Lead with a single concise 'How to apply these practices' workflow (audit metadata -> trim body -> split references -> add validation -> test) so the guide itself models the sequenced, checkpointed workflow it recommends.

DimensionReasoningScore

Conciseness

At 1020 lines the body is over twice the 500-line limit the skill itself prescribes, and it extensively explains concepts Claude already knows (progressive-disclosure mechanics, runtime architecture, the Claude A/Claude B iteration narrative), matching the "noticeably verbose; several unnecessary explanations or padded sections" anchor.

2 / 5

Actionability

It provides concrete, copy-paste-ready guidance — named patterns (Pattern 1/2/3), good/bad description examples, executable script snippets, and checklists — with only minor gaps, fitting the "mostly executable guidance; concrete code or commands with minor gaps" anchor.

4 / 5

Workflow Clarity

Workflow examples include explicit sequences, checklists, and feedback loops (validate -> fix -> retry), and the evaluation-driven-development section is well sequenced; however the skill is organized as a reference rather than one unified apply-these-steps workflow with checkpoints, so a couple of validation checkpoints are implicit rather than enforced.

4 / 5

Progressive Disclosure

No bundle files exist and all 1020 lines are inlined into a single SKILL.md despite the skill advocating splitting content over 500 lines into separate reference files; internal header structure is good, but content that should live in separate files is inlined, fitting the "some structure but content that should be separate is inline" anchor.

3 / 5

Total

13

/

20

Passed

Description

57%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.

The description clearly states its purpose and includes an explicit trigger clause, giving it solid completeness and distinctiveness. It is weakened by vague, non-action language and incomplete trigger-term coverage, leaving it mid-range overall.

Suggestions

Replace the generic noun phrase "Comprehensive guide for skill development" with concrete third-person verbs, e.g. "Reviews, structures, and iterates on SKILL.md files against Anthropic's official best practices."

Expand the trigger clause with natural user phrases: "Use when writing, refactoring, or reviewing a SKILL.md, or when structuring a skill bundle with reference files and scripts."

Add concrete trigger terms users would actually say ("skill authoring", "writing a skill", "SKILL.md", "skill bundle") to improve discovery.

DimensionReasoningScore

Specificity

The description names the domain ("skill development", "Anthropic's official best practices") but offers no concrete actions — "Comprehensive guide" is a generic noun phrase rather than verbs like review, structure, or apply, matching the anchor where the domain is named but actions are minimal.

2 / 5

Completeness

Both what ("Comprehensive guide for skill development based on Anthropic's official best practices") and when ("use for complex skills requiring detailed structure") are present, but the trigger clause could be more explicit and specific with concrete trigger phrases.

4 / 5

Trigger Term Quality

It includes relevant terms ("skill development", "best practices", "complex skills requiring detailed structure") but misses common natural variations a user might say such as "skill authoring", "writing a SKILL.md", or "structuring a skill", so coverage is partial.

3 / 5

Distinctiveness Conflict Risk

It carves a fairly clear niche (Anthropic's official skill-authoring best practices) with minor overlap risk against other generic skill-authoring helpers, fitting the "mostly distinct; minor overlap risk" anchor.

4 / 5

Total

13

/

20

Passed

Validation

81%

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

Validation13 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

skill_md_line_count

SKILL.md is long (1021 lines); consider splitting into references/ and linking

Warning

relative_links

Relative link issues: 22 missing, 7 deeper-than-1-level

Warning

referenced_paths_exist

Referenced path issues: 9 missing

Warning

Total

13

/

16

Passed

Repository
NeoLabHQ/context-engineering-kit
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.