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agent-creator

Create custom AI subagents with proper plugin structure, persona generation, and companion routing skills.

Quality

78%

Does it follow best practices?

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SecuritybySnyk

Passed

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tessl review fix ./skills/antigravity-agent-creator/SKILL.md
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.

The content is a strongly actionable, well-sequenced workflow with concrete templates, explicit pre-write validation steps, and a final review checkpoint. Its only weaknesses are minor redundancy in the safety caveats and the absence of an explicit error-recovery loop for failed validation or activation.

DimensionReasoningScore

Conciseness

The body is efficient instruction rather than explanation of known concepts, with templates and examples that earn their tokens; minor redundancy could be trimmed — the host-validation caveat appears in "Why this exists", "Target directory", and "Limitations", and phrases like "This is the most important step." are padding.

4 / 5

Actionability

Fully concrete guidance: exact folder trees, the validation regex `^[a-z0-9]+(-[a-z0-9]+)*$`, a complete plugin.json block, and full verbatim templates for the agent file and companion skill. The remaining placeholders are inherent to a generation skill, and the scoring notes confirm absence of executable code is not penalized for instruction-only skills with actionable guidance.

5 / 5

Workflow Clarity

Seven clearly sequenced steps with explicit checkpoints: name validation with "resolve the final target path and verify it stays under <appDataDir>\config\plugins\", "stop and ask for a safe replacement", symlink checks before writing, and the Step 7 review/summary. Not a 5 because no explicit error-recovery feedback loop is defined (e.g., what to do when schema validation or the invocation check fails).

4 / 5

Progressive Disclosure

A single-file skill with no bundle files and well-organized sections that is appropriately self-contained; the two large embedded templates (agent file and companion skill) could arguably be split into reference files, which keeps it at 4 rather than 5.

4 / 5

Total

17

/

20

Passed

Description

66%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 clearly states what the skill does with several concrete capabilities and distinct niche framing, but it entirely lacks a "Use when..." trigger clause and misses common natural phrasings users would use. Adding explicit trigger guidance would resolve its main weakness.

Suggestions

Append an explicit trigger clause, e.g. "Use when the user wants to create a custom subagent, build an agent plugin, or generate a persona for an AI agent."

Include natural user phrasings and synonyms such as "create an agent", "custom assistant", or "agent team" to improve trigger term coverage.

Mention the concrete scaffolding actions (folder structure, plugin.json, agent .md file) instead of the vague "proper plugin structure" to round out capability coverage.

DimensionReasoningScore

Specificity

Names several concrete actions ("Create custom AI subagents", "persona generation", "companion routing skills") with minor gaps — folder scaffolding and plugin.json authoring are not mentioned, and "proper plugin structure" leans on the filler word "proper".

4 / 5

Completeness

The "what" is clear (create subagents, generate personas, add routing skills), but there is no "Use when..." clause or equivalent explicit trigger guidance, which the judging guidelines cap at 3.

3 / 5

Trigger Term Quality

Good keyword coverage with "subagents", "persona", "routing skills", and "plugin", but natural phrases users would say such as "create an agent", "custom assistant", or "agent team" are missing, so it falls just short of comprehensive.

4 / 5

Distinctiveness Conflict Risk

The subagent-creation-and-plugin-packaging niche is mostly distinct with concrete triggers, with only minor overlap risk against plugin-authoring or agent-configuration skills.

4 / 5

Total

15

/

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

frontmatter_unknown_keys

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

Warning

Total

15

/

16

Passed

Repository

boisenoise/skills-collections

Path

skills/antigravity-agent-creator/SKILL.md

Reviewed

Table of Contents

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