CtrlK
BlogDocsLog inGet started
Tessl Logo

ttfb

Use when auditing slow first responses on SSR pages, APIs, or cacheable HTML. Distinguish origin compute time from network latency and CDN cache misses before proposing a fix.

65

Quality

78%

Does it follow best practices?

Run evals on this skill

Adds up to 20 points to the overall score

View guide

SecuritybySnyk

Passed

No findings from the security scan

Fix and improve this skill with Tessl

tessl review fix ./skills/ttfb/SKILL.md
SKILL.md
Quality
Evals
Security

Quality

Content

57%

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

The body is a tidy overview with excellent progressive disclosure to a real reference file, but it is held back by redundancy, deferred (absent) executable examples, and a loosely sequenced workflow without an inline validation checkpoint.

Suggestions

Collapse the overlapping Quick Reference and Fix sections into one actionable list to remove redundancy and tighten the token budget.

Inline at least one executable snippet (e.g. a Lighthouse/DevTools command or a Cache-Control header example) rather than deferring all code to the reference, so the body stands on its own.

Convert Check/Fix/Code Review into a numbered workflow with an explicit 'verify TTFB < 800ms after the change' step pulled up from the reference, adding a validation feedback loop.

DimensionReasoningScore

Conciseness

Mostly efficient, but the Quick Reference bullets overlap the Fix section (database queries, caching, CDN) and the meta 'Explain how TTFB impacts …' section restates concepts rather than adding actionable signal.

2 / 3

Actionability

The Code Review section gives specific flags and a concrete ~800ms threshold, but the body itself contains no executable code or commands — those are deferred to references/rule.md, leaving the inline guidance incomplete.

2 / 3

Workflow Clarity

The Check → Fix → Code Review flow gives a loose sequence, but it is organized topically rather than as a numbered process, and the verification checkpoint lives in the reference instead of being an explicit step in the body.

2 / 3

Progressive Disclosure

The body is a clear overview that points to a single one-level-deep reference ('see references/rule.md' for full implementation details), which exists and is well-organized — appropriately split and easy to navigate.

3 / 3

Total

9

/

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.

A concise, well-constructed description with an explicit trigger clause and concrete diagnostic actions. It clearly communicates both when to use the skill and what it does.

DimensionReasoningScore

Specificity

Names multiple concrete actions — 'auditing slow first responses', 'Distinguish origin compute time from network latency and CDN cache misses', and 'proposing a fix' — rather than vague language.

3 / 3

Completeness

Opens with an explicit 'Use when …' trigger (the when) and follows with the diagnostic/fix actions (the what), satisfying both halves.

3 / 3

Trigger Term Quality

Includes natural terms a performance-focused user would say — 'slow first responses', 'SSR pages', 'APIs', 'cacheable HTML' — covering the common phrasings for this need.

3 / 3

Distinctiveness Conflict Risk

The TTFB-diagnosis niche — distinguishing origin compute from network latency and CDN cache misses — is specific and unlikely to trigger for unrelated skills.

3 / 3

Total

12

/

12

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.

Validation15 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

metadata_version

'metadata.version' is missing

Warning

Total

15

/

16

Passed

Repository
thedaviddias/Front-End-Checklist
Reviewed

Table of Contents

Is this your skill?

If you maintain this skill, you can claim it as your own. Once claimed, you can manage eval scenarios, bundle related skills, attach documentation or rules, and ensure cross-agent compatibility.