flox-builds
Building and packaging applications with Flox. Use for manifest builds, Nix expression builds, sandbox modes, multi-stage builds, and packaging assets.
64
75%
Does it follow best practices?
Impact
—
No eval scenarios have been run
Advisory
Suggest reviewing before use
Optimize this skill with Tessl
npx tessl skill review --optimize ./flox-plugin/skills/flox-builds/SKILL.mdQuality
Discovery
85%Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.
This is a solid skill description that clearly identifies its niche (Flox-based building and packaging) and provides explicit trigger guidance via the 'Use for...' clause. The specificity of capabilities and distinctiveness are strong, though trigger term quality could be improved by including more natural user language variations alongside the technical terms.
Suggestions
Add common natural language variations users might say, such as 'package an app', 'flox build', 'flox.toml', or 'create a derivation' to improve trigger term coverage.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Lists multiple specific concrete actions: manifest builds, Nix expression builds, sandbox modes, multi-stage builds, and packaging assets. These are distinct, concrete capabilities rather than vague language. | 3 / 3 |
Completeness | Clearly answers both 'what' (building and packaging applications with Flox) and 'when' (Use for manifest builds, Nix expression builds, sandbox modes, multi-stage builds, and packaging assets). The 'Use for...' clause serves as an explicit trigger guidance. | 3 / 3 |
Trigger Term Quality | Includes relevant technical terms like 'Flox', 'Nix expression', 'manifest builds', 'sandbox modes', and 'multi-stage builds', but these are fairly technical. Missing more natural user terms like 'package', 'build app', 'flox build', 'flox.toml', or 'derivation' that users might actually say. | 2 / 3 |
Distinctiveness Conflict Risk | Highly distinctive due to the specific mention of 'Flox' and 'Nix expression builds'. This is a clear niche that is unlikely to conflict with general build or packaging skills. | 3 / 3 |
Total | 11 / 12 Passed |
Implementation
64%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This is a thorough and highly actionable skill with excellent concrete examples covering manifest builds, Nix expression builds, multi-stage patterns, and language-specific packaging. Its main weaknesses are length (could benefit from splitting detailed sections into referenced files) and the lack of integrated validation checkpoints in build workflows. Some explanatory prose about why Nix builds are functional or why environments should be separated adds tokens without helping Claude execute tasks.
Suggestions
Add explicit validation checkpoints within build workflows (e.g., 'Verify: ls result-<name>/bin/<name> && ./result-<name>/bin/<name> --version' after build steps) rather than relegating debugging to a separate section.
Move language-specific build examples and Nix expression builds into separate referenced files (e.g., LANGUAGE_EXAMPLES.md, NIX_BUILDS.md) to keep SKILL.md as a concise overview.
Trim explanatory rationale sections like 'Why separate environments?' — Claude doesn't need persuasion, just the pattern and when to apply it.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The skill is fairly comprehensive but includes some unnecessary explanatory content that Claude would already know (e.g., explaining what 'functional' and 'isolated' mean for Nix builds, the 'Why separate environments?' rationale section). The comparison tables and FHS layout are useful but some prose could be tightened. | 2 / 3 |
Actionability | Excellent actionability throughout — nearly every section includes executable TOML configurations, bash commands, or Nix expressions that are copy-paste ready. The language-specific examples (Python, Node.js, Rust, Go) are concrete and complete, and the multi-stage build patterns show real working configurations. | 3 / 3 |
Workflow Clarity | The dev→build→publish→runtime workflow is well-sequenced, and multi-stage build patterns are clear. However, there are no explicit validation checkpoints in the build workflows — the debugging section is separate and reactive rather than integrated as verification steps. For a system involving sandbox builds and multi-stage pipelines, inline validation steps (e.g., 'verify result symlink exists', 'check binary runs') would improve reliability. | 2 / 3 |
Progressive Disclosure | The content is well-structured with clear headers and logical sections, and references related skills at the end. However, at ~300 lines this is quite long for a SKILL.md — the language-specific examples, Nix expression builds, and asset packaging sections could be split into separate referenced files. The document tries to be both overview and comprehensive reference. | 2 / 3 |
Total | 9 / 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.
Validation — 11 / 11 Passed
Validation for skill structure
No warnings or errors.
- Repository
- flox/flox-agentic
- Commit
5f851be
- Reviewed
Table of Contents
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