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choosing-trend-or-slope-view

Clarify how to visualize change over a time range before building a trend. Use whenever the user asks how much something changed, grew, dropped, improved, or regressed between two points or periods — "how much did X change from A to B", "before vs after", "start vs end", "week over week", "compare this month to last", "change over time" — or mentions a "slope chart" / "slopegraph". Two readings of "change" need different charts: the whole trend (a line, every interval) versus just the two endpoints (a slope, start vs end). Ask which they want, then render it. Not for choosing a saved insight ChartDisplayType in the insight editor.

73

Quality

89%

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SKILL.md
Quality
Evals
Security

Quality

Content

85%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.

A tight, well-structured skill body: it disambiguates the two readings of 'change', gives concrete render guidance with an executable example, and documents real edge cases without padding. The only slack is minor verbosity in the limits section and the slope path relying on instruction rather than a second code block.

DimensionReasoningScore

Conciseness

Lean body with no concept padding Claude already knows; the comparison, either/or question, render paths, and limits all earn their place, with only minor over-explanation in the 'Important limits' prose, fitting between the 4 and 5 anchors.

4 / 5

Actionability

Provides an executable TrendsQuery JSON with real field values for the line path and names the exact tool (posthog:query-trends) and UI toggle (Line / Bar / Slope) for the slope path; the slope path is instruction-only but justified since it is a UI toggle on the same query.

4 / 5

Workflow Clarity

Clear decision sequence — disambiguate, ask an either/or or skip if the user named one, then render via the correct path — with explicit branching logic; this is a single-purpose non-destructive task so the validation cap does not apply, matching the 5 anchor.

5 / 5

Progressive Disclosure

Under 50 lines with well-organized sections (intro, How to render each, Important limits) and no external bundle files needed, satisfying the simple-skills note that a well-organized single-purpose skill can score 5.

5 / 5

Total

18

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20

Passed

Description

95%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 strong, well-targeted description that states concrete capabilities, packs in natural trigger phrases, and explicitly demarcates its scope with a negative boundary. Slightly less exhaustive on distinct concrete actions than the top specificity anchor, but otherwise excellent.

DimensionReasoningScore

Specificity

Names several concrete actions — 'Clarify how to visualize change over a time range', 'Ask which they want, then render it', and the line-vs-slope distinction — with only minor gaps in coverage, fitting between the 3 and 5 anchors.

4 / 5

Completeness

Explicitly answers both what (clarify which change-visualization and render it) and when (the 'Use whenever...' clause with concrete trigger phrases), plus a clear negative boundary, matching the 5 anchor.

5 / 5

Trigger Term Quality

Comprehensive natural trigger phrases a user would actually say ('how much did X change from A to B', 'before vs after', 'start vs end', 'week over week', 'compare this month to last', 'change over time', 'slope chart', 'slopegraph') including synonyms, matching the 5 anchor.

5 / 5

Distinctiveness Conflict Risk

Occupies a clear niche (trend line vs slope disambiguation) with an explicit negative boundary ('Not for choosing a saved insight ChartDisplayType in the insight editor') minimizing conflict risk, matching the 5 anchor.

5 / 5

Total

19

/

20

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.

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
PostHog/posthog
Reviewed

Table of Contents

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