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ponytail

Forces the laziest solution that actually works, simplest, shortest, most minimal. Channels a senior dev who has seen everything: question whether the task needs to exist at all (YAGNI), reach for the standard library before custom code, native platform features before dependencies, one line before fifty. Supports intensity levels: lite, full (default), ultra. Use whenever the user says "ponytail", "be lazy", "lazy mode", "simplest solution", "minimal solution", "yagni", "do less", or "shortest path", and whenever they complain about over-engineering, bloat, boilerplate, or unnecessary dependencies.

Quality

96%

Does it follow best practices?

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SecuritybySnyk

Passed

No findings from the security scan

The canonical home for this skill is ponytail in TanStack/ai

SKILL.md
Quality
Evals
Security

Quality

Content

92%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.

An exemplary behavioral skill body: a crisp decision ladder, concrete rules with worked examples at every intensity level, and explicit exceptions for when not to be lazy. Its only weakness is minor rhetorical padding that slightly inflates token cost without adding guidance.

Suggestions

Trim persona flourishes ("The best code is the code never written", "a bug farm with a hit rate") to cut a few tokens without losing guidance.

Compress the Output section: the rule against unrequested prose is stated three ways; the pattern line "[code] → skipped: [X], add when [Y]" plus one sentence suffices.

Consider shortening the hardware paragraph in "When NOT to be lazy" to its rule ("leave the calibration knob for anything touching the physical world") since the examples are illustrative rather than instructive.

DimensionReasoningScore

Conciseness

Mostly lean and dense, but a few stylized flourishes could be trimmed: "The best code is the code never written", "clever is what someone decodes at 3am", "a bug farm with a hit rate", and the Output section's extended rule ("every paragraph defending a simplification is complexity smuggled back in as prose"). Not 5 because minor rhetorical padding remains; not 3 because nothing explains concepts Claude already knows.

4 / 5

Actionability

Fully actionable for an instruction-only skill: a numbered ladder with "Stop at the first rung that holds", a concrete comment convention with a worked example ("# ponytail: global lock, per-account locks if throughput matters"), an output pattern ("[code] → skipped: [X], add when [Y]"), and a cache example worked at all three intensity levels ("@lru_cache(maxsize=1000) on the fetch function"). Per the code-vs-instruction note, the absence of code blocks is not penalized.

5 / 5

Workflow Clarity

A single-purpose behavioral skill with an unambiguous ordered decision procedure (rungs 1–6, "Two rungs work → take the higher one") and an explicit validation requirement ("leaves ONE runnable check behind, the smallest thing that fails if the logic breaks"). The simple-skill exception applies and no destructive/batch cap is triggered; not 4 because the checkpoints are explicit, not gapped.

5 / 5

Progressive Disclosure

The ~87-line body is organized into clear sections (Persistence, The ladder, Rules, Output, Intensity, When NOT to be lazy, Boundaries) with no external references needed and nothing inlined that belongs in a bundle file. Splitting this into references/ files would add structure without benefit, so the inline organization is appropriate.

5 / 5

Total

19

/

20

Passed

Description

100%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 well-crafted description: concrete capabilities, explicit dual-direction triggers (quoted phrases and complaint topics), third-person voice, and a distinctive niche anchored by a unique keyword. It reads as a model description for a behavioral skill.

DimensionReasoningScore

Specificity

Lists multiple specific concrete actions — "question whether the task needs to exist at all (YAGNI), reach for the standard library before custom code, native platform features before dependencies, one line before fifty" — plus the three intensity levels ("lite, full (default), ultra"). Coverage of the skill's behaviors is comprehensive, so it fits the 5 anchor rather than 4 (which requires minor gaps).

5 / 5

Completeness

Explicitly answers both what ("Forces the laziest solution that actually works, simplest, shortest, most minimal") and when with concrete trigger phrases ("Use whenever the user says 'ponytail', 'be lazy', ... and whenever they complain about over-engineering..."). Matches the 5 anchor exactly; third-person voice is used correctly.

5 / 5

Trigger Term Quality

Comprehensive natural trigger coverage: "ponytail", "be lazy", "lazy mode", "simplest solution", "minimal solution", "yagni", "do less", "shortest path", plus complaint phrases "over-engineering, bloat, boilerplate, or unnecessary dependencies" — these are exactly the phrases a user would naturally say. Not 4 because no common variation is missing.

5 / 5

Distinctiveness Conflict Risk

The unique keyword "ponytail" and a coherent YAGNI/laziness niche give clear, distinct triggers with minimal conflict risk. Not 4: generic phrases like "simplest solution" have at most negligible overlap with other skills and the niche is unmistakable.

5 / 5

Total

20

/

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

TanStack/ai

Path

.grok/skills/ponytail/SKILL.md

Reviewed

Table of Contents

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