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nushell-plugin-builder

Guide for creating Nushell plugins in Rust using nu_plugin and nu_protocol crates. Use when users want to build custom Nushell commands, extend Nushell with new functionality, create data transformations, or integrate external tools/APIs into Nushell. Covers project setup, command implementation, streaming data, custom values, and testing.

95

1.20x
Quality

93%

Does it follow best practices?

Impact

95%

1.20x

Average score across 3 eval scenarios

SecuritybySnyk

Advisory

Suggest reviewing before use

SKILL.md
Quality
Evals
Security

Quality

Content

87%

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

The body is lean, highly actionable, and well-structured with properly signaled references that all resolve to real bundle files. The main gap is the absence of explicit validation/verification checkpoints in the build-and-reload workflow.

Suggestions

Add an explicit verification checkpoint after building/registering (e.g., confirm the plugin loaded with `plugin list` and show expected output before proceeding to test).

Add a feedback loop for the iterative reload workflow: if `plugin use <name>` fails or the command errors, show how to inspect the failure (e.g., `plugin list`, checking `cargo build` errors) and retry.

Replace the `/* condition */` and `...` placeholders in the streaming example with a concrete, executable filter so the advanced snippet is fully runnable.

DimensionReasoningScore

Conciseness

Dense with executable code and minimal conceptual padding; the overview is a single line and it does not explain basic Rust or Nushell concepts Claude already knows.

3 / 3

Actionability

Provides copy-paste-ready executable code throughout (cargo commands, full plugin impl, signature builders, error handling, testing harness), with only minor placeholders in the streaming snippet.

3 / 3

Workflow Clarity

Steps are sequenced (Quick Start, iterative reload loop) but lack explicit validation checkpoints or error-recovery feedback loops, leaving verification implicit.

2 / 3

Progressive Disclosure

Clear overview with well-signaled one-level-deep references (advanced-features, examples, testing-debugging, plugin-protocol) plus a template script, all verified to exist in the bundle; content appropriately split.

3 / 3

Total

11

/

12

Passed

Description

100%

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, third-person, and clearly distinguishes the skill's niche with explicit 'Use when' triggers. It comprehensively covers both capabilities and invocation conditions without verbosity.

DimensionReasoningScore

Specificity

Lists multiple concrete actions ('build custom Nushell commands, extend Nushell with new functionality, create data transformations, or integrate external tools/APIs') plus a coverage list of project setup, command implementation, streaming, custom values, and testing.

3 / 3

Completeness

Explicitly answers both what ('Guide for creating Nushell plugins in Rust...') and when ('Use when users want to build...') with an explicit trigger clause.

3 / 3

Trigger Term Quality

Includes natural phrasings a user would say ('build custom Nushell commands', 'integrate external tools/APIs into Nushell', 'create data transformations') with good coverage rather than jargon-only language.

3 / 3

Distinctiveness Conflict Risk

Clear niche of Nushell plugin development in Rust with named crates (nu_plugin, nu_protocol) and domain-specific triggers unlikely to conflict with other skills.

3 / 3

Total

12

/

12

Passed

Validation

100%

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

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
YPares/agent-skills
Reviewed

Table of Contents

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