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app-builder

Main application building orchestrator. Creates full-stack applications from natural language requests. Determines project type, selects tech stack, coordinates agents.

Quality

60%

Does it follow best practices?

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Adds up to 20 points to the overall score

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SecuritybySnyk

Passed

No findings from the security scan

Fix and improve this skill with Tessl

tessl review fix ./skills/antigravity-app-builder/SKILL.md

The canonical home for this skill is app-builder in sickn33/agentic-awesome-skills

SKILL.md
Quality
Evals
Security

Quality

Content

50%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 well organized as a navigation hub with selective-reading rules and clear tables, but it functions as a directory for files that are not actually bundled, and its dense prerequisite paragraph buries critical constraints. As delivered, the skill leaves the reader with structure but little executable content.

Suggestions

Ship the referenced bundle files (project-detection.md, tech-stack.md, agent-coordination.md, scaffolding.md, feature-building.md, templates/*/TEMPLATE.md) or inline their essential content — the content map currently points to files that do not exist in the skill directory.

Break the run-on 'Scope and template prerequisites' paragraph into a short bulleted checklist, fix the 'These13' typo and the 'Templates (13)' count mismatch (the table lists 12; templates/SKILL.md is unlisted), and replace the circular 'When to Use' sentence with real trigger guidance.

Promote the usage example into an explicit workflow with validation checkpoints (e.g. run tests, verify local preview, confirm authorization before deploy/report) so the sequence carries its own feedback loops.

DimensionReasoningScore

Conciseness

The body is mostly terse tables and lists, but the ~120-word run-on 'Scope and template prerequisites' paragraph (e.g. 'These13 Markdown templates describe layouts... Report actual tests, not production-ready guarantees.'), the circular 'When to Use' filler ('applicable to execute the workflow or actions described in the overview'), and emoji headers are more than the 'minor instances that could be trimmed' of the 4 anchor.

3 / 5

Actionability

The template-selection table and the worked usage example ('Project type: Social Media App', stack choice, plan breakdown) give some concrete guidance, but the actual execution guidance — keyword matrix, stack selection rules, agent pipeline — lives entirely in referenced files that are absent from the bundle, leaving key details missing.

3 / 5

Workflow Clarity

A six-step sequence exists (project type → tech stack → plan → coordinate agents → report → preview) but is presented only as an illustrative example, and validation is implicit (testing and local previews are mentioned only as scattered caveats) rather than explicit checkpoints in the workflow.

3 / 5

Progressive Disclosure

The content map with a 'When to Read' column and the template table are well-signaled, one-level-deep navigation in form, but none of the referenced files (project-detection.md, tech-stack.md, agent-coordination.md, scaffolding.md, feature-building.md, templates/*/TEMPLATE.md) exist in the bundle — only SKILL.md is present — so navigation leads nowhere, and the 'Templates (13)' header lists only 12 templates while templates/SKILL.md points outside the table.

3 / 5

Total

12

/

20

Passed

Description

55%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 gives a clear picture of what the skill does through several concrete actions, but it omits any 'use when' trigger guidance and lacks the natural vocabulary users would employ when requesting an app build. It is serviceable but would benefit from explicit trigger phrasing and broader synonyms.

Suggestions

Add an explicit 'Use when...' clause with concrete triggers, e.g. 'Use when the user asks to build, scaffold, or generate a complete application — web app, SaaS, REST API, mobile app, browser extension, or CLI — from a natural language description.'

Include natural user-side synonyms such as 'build an app', 'make me a website', 'create an MVP', 'scaffold a project', and framework names (Next.js, FastAPI, Flutter) that map to the bundled templates.

Mention the downstream capabilities (project structure scaffolding, feature building) to close the coverage gap and reduce overlap ambiguity with single-purpose framework skills.

DimensionReasoningScore

Specificity

The description lists several concrete actions ('Creates full-stack applications from natural language requests', 'Determines project type, selects tech stack, coordinates agents') but has minor coverage gaps — scaffolding, planning, and feature-building from the body are absent, and 'coordinates agents' is somewhat abstract — so it does not reach the comprehensive coverage of the 5 anchor.

4 / 5

Completeness

The 'what' is clearly stated (creates full-stack applications, determines project type, selects tech stack, coordinates agents), but there is no 'Use when...' clause or equivalent explicit trigger guidance, which caps completeness at 3 per the judging guidelines.

3 / 5

Trigger Term Quality

Terms like 'full-stack applications', 'tech stack', and 'project type' are relevant, but the natural phrases users would say ('build an app', 'web app', 'SaaS', 'mobile app', 'scaffold a project') are missing — more than a few natural variations absent, placing it below the 4 anchor.

3 / 5

Distinctiveness Conflict Risk

The orchestrator framing carves out a niche, but 'creates full-stack applications' spans web, mobile, and desktop, creating more than minor overlap risk with framework-specific and scaffolding skills — fitting the 'somewhat specific but could still overlap' anchor.

3 / 5

Total

13

/

20

Passed

Validation

87%

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

Validation — 14 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

frontmatter_unknown_keys

Unknown frontmatter key(s) found; consider removing or moving to metadata

Warning

relative_links

Relative link issues: 12 missing, 12 deeper-than-1-level

Warning

Total

14

/

16

Passed

Repository

boisenoise/skills-collections

Path

skills/antigravity-app-builder/SKILL.md

Reviewed

Table of Contents

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