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bun-runtime

Bun as runtime, package manager, bundler, and test runner. When to choose Bun vs Node, migration notes, and Vercel support.

66

Quality

83%

Does it follow best practices?

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SecuritybySnyk

Passed

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SKILL.md
Quality
Evals
Security

Quality

Content

82%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.

A lean, highly actionable reference with concrete commands, working code, and sensible caveats on risky operations (bun audit fix, lockfile migration). Weakest on structure: dense version-sensitive command detail is inlined rather than offloaded to reference files, and a little descriptive padding could be trimmed.

DimensionReasoningScore

Conciseness

Command-dense and free of concept tutorials, but the opening sentence restates the description and version-dated facts ("As of Bun 1.4 the runtime itself is implemented in Rust", bun.lock vs bun.lockb) sit inline rather than in a dedicated old-patterns section. Efficient with minor trimmable padding, matching anchor 4.

4 / 5

Actionability

Fully executable, copy-paste-ready commands and code throughout: bun install/run/test invocations, vercel.json's bunVersion setting, and runnable Bun.serve and bun:test examples covering the common cases, matching anchor 5.

5 / 5

Workflow Clarity

Selection ("Prefer Bun"/"Prefer Node") and migration mappings are clearly sequenced, and the one modifying operation (bun audit fix) carries an explicit review caution. Missing explicit post-install/build verification keeps it below anchor 5.

4 / 5

Progressive Disclosure

Well-organized sections (When to Use, How It Works, Examples, Best Practices) with clearly signaled outbound doc links and no bundle files. The ~88-line body inlines dense command-caveat paragraphs (pm commands, CI test flags) that could live in a reference file, so it is short of anchor 5's ideal split.

4 / 5

Total

17

/

20

Passed

Description

78%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 compact, specific, third-person description that clearly identifies Bun's four roles and its decision context. Its main weakness is the absence of an explicit 'Use when...' trigger phrase, leaving the 'when' as an implied topic rather than concrete invocation guidance.

DimensionReasoningScore

Specificity

Enumerates several concrete capability roles ("runtime, package manager, bundler, and test runner") plus migration notes and Vercel support. Falls just short of anchor 5 because capabilities are noun phrases rather than fully itemized concrete actions, and clearly exceeds anchor 3's 1-2 actions.

4 / 5

Completeness

Answers both what ("Bun as runtime, package manager, bundler, and test runner") and when ("When to choose Bun vs Node"), but the 'when' is a topic statement rather than an explicit 'Use when...' trigger clause, so it is not the fully explicit anchor 5.

4 / 5

Trigger Term Quality

Strong natural terms users would say ("Bun", "Node", "Vercel", "migration", "runtime", "test runner"), but common variations like "bun install", "bun test", or "JavaScript/TypeScript" are missing, so it does not reach comprehensive anchor 5.

4 / 5

Distinctiveness Conflict Risk

Clear niche (the Bun toolchain) with distinct triggers; the explicit Bun-vs-Node framing and Vercel mention make wrong-skill triggering very unlikely, with only negligible overlap risk from mentioning Node.

5 / 5

Total

17

/

20

Passed

Validation

93%

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

CriteriaDescriptionResult

referenced_paths_exist

Referenced path issues: 1 missing

Warning

Total

15

/

16

Passed

Repository

affaan-m/ECC

Path

.agents/skills/bun-runtime/SKILL.md

Reviewed

Table of Contents

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