package-npm-nix

Package npm/TypeScript/Bun CLI tools for Nix. Use when creating Nix derivations for JavaScript/TypeScript tools from npm registry or GitHub sources, handling pre-built packages or source builds with dependency management.

1.63x

Quality

82%

Does it follow best practices?

Impact

100%

1.63x

Average score across 3 eval scenarios

Securityby

Low

Low-risk findings worth noting

Quality

Content

77%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 highly actionable with a well-validated workflow, but it is monolithic — substantial template and reference material that belongs in separate files is inlined, and some patterns are repeated across sections.

Suggestions

Move the full source-build Bun derivation template and the troubleshooting catalog into reference files (e.g. references/source-build.nix, references/troubleshooting.md) and link to them from SKILL.md to improve progressive disclosure.

Consolidate the shebang-replacement, hash-verification, and executable-bit guidance so they appear once (in common_patterns) rather than repeated across quick_start and anti_patterns.

Trim the anti_patterns section to only the pitfalls not already demonstrated positively elsewhere, reducing token cost without losing signal.

Dimension	Reasoning	Score
Conciseness	Mostly efficient and assumes Claude knows Nix, but the anti_patterns and common_patterns sections repeat shebang, hash, and executable-bit guidance already shown in quick_start, adding padding.	3 / 5
Actionability	Provides fully executable, copy-paste-ready Nix derivations plus specific commands (nix-prefetch-url, nix hash convert, nix build, nix fmt, nix flake check) covering the common pre-built and Bun source-build cases.	5 / 5
Workflow Clarity	A clearly sequenced 5-step workflow with explicit validation in step 5 (ldd, --version, --help, nix flake check), a build checklist, and troubleshooting feedback loops for hash mismatch and lockfile mismatch.	5 / 5
Progressive Disclosure	No bundle files exist and all content (two full derivation templates, troubleshooting catalog, metadata guide) is inlined in one ~580-line file; section structure is good but nothing is split into separate referenced files.	3 / 5
	Total	16 / 20 Passed

Description

87%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 is specific, well-triggered, and clearly distinguishes both the task and invocation conditions. It is a strong, third-person description with only minor room for additional synonyms.

Dimension	Reasoning	Score
Specificity	Lists several concrete actions — packaging CLI tools, creating Nix derivations from npm/GitHub sources, and handling pre-built vs source builds with dependency management — with only minor abstraction in 'handling'.	4 / 5
Completeness	Explicitly answers both what ('Package npm/TypeScript/Bun CLI tools for Nix') and when ('Use when creating Nix derivations...') with concrete trigger phrases.	5 / 5
Trigger Term Quality	Strong natural keyword coverage ('npm/TypeScript/Bun CLI tools', 'Nix derivations', 'npm registry', 'GitHub sources') that users would say, though synonyms and file extensions are absent.	4 / 5
Distinctiveness Conflict Risk	Occupies a clear niche (Nix packaging of npm-based tools) with distinct triggers and minimal overlap with unrelated skills.	5 / 5
	Total	18 / 20 Passed

Validation

93%

Warnings & errors only

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

Validation — 15 / 16 Passed

Validation for skill structure

Criteria	Description	Result
skill_md_line_count	SKILL.md is long (591 lines); consider splitting into references/ and linking	Warning

	Total	15 / 16 Passed

Repository: YPares/agent-skills
Path: package-npm-nix/SKILL.md
Commit: e9d2149

Reviewed: 3 days ago

Table of Contents

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