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sponsored-newsletter-finder

Discover newsletters in a target niche relevant to your ICP, evaluate audience fit, estimate reach and CPM, and output a ranked shortlist of sponsorship opportunities. Uses web search to find newsletters, then scores each against ICP alignment criteria. Use when a marketing team wants to reach an existing engaged audience for less than the cost of building their own, or when testing a new channel before committing.

68

Quality

84%

Does it follow best practices?

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SecuritybySnyk

Low

Low-risk findings worth noting

SKILL.md
Quality
Evals
Security

Quality

Content

76%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 highly actionable, well-structured research skill with concrete search queries, scoring rubric, and output templates. Its main gap is the absence of explicit validation/feedback checkpoints for the batch evaluation phase, which caps workflow clarity.

Suggestions

Add an explicit validation checkpoint in Phase 2 (e.g., 'Verify subscriber counts from a second source when possible; discard newsletters with unverifiable reach') to satisfy the batch-operation feedback-loop requirement.

Tighten or relocate the introductory framing line and CPM benchmark table to reduce token overhead and push conciseness toward the top anchor.

Consider moving the full output markdown template and outreach templates into a reference file referenced one level deep to improve progressive disclosure.

DimensionReasoningScore

Conciseness

Largely efficient with well-organized phases and no over-explanation of concepts Claude already knows, but a few padded lines (e.g., 'Cheaper and faster than building your own list from scratch — newsletters already have the trust and the audience') and the CPM benchmark list could be trimmed slightly.

4 / 5

Actionability

Provides copy-paste-ready guidance: exact search query strings, a scored rubric table with 1/3/5 anchors, CPM benchmark ranges by subscriber tier, a complete output markdown template, and outreach email templates.

5 / 5

Workflow Clarity

The five phases (Intake → Discovery → Evaluate → Competitive Intel → Output) are clearly sequenced, but evaluating a batch of discovered newsletters lacks explicit validation checkpoints (e.g., cross-check subscriber counts, sanity-check scores); per the batch-operation guideline, missing validation caps this at 3.

3 / 5

Progressive Disclosure

No bundle files exist, so the single SKILL.md holds everything; sections are well-organized with clear headers, but at ~190 lines content like the output template and CPM benchmarks are inlined rather than split into references, leaving minor organization gaps.

4 / 5

Total

16

/

20

Passed

Description

92%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, specific description that concretely states both capabilities and an explicit 'Use when' trigger for a well-scoped niche. Only the trigger-term breadth is slightly shy of the top anchor.

DimensionReasoningScore

Specificity

Lists multiple concrete actions — 'Discover newsletters', 'evaluate audience fit', 'estimate reach and CPM', 'output a ranked shortlist', 'Uses web search to find newsletters, then scores each' — giving comprehensive coverage of capabilities.

5 / 5

Completeness

Clearly answers 'what' (discover/evaluate/estimate/rank newsletters) and explicitly answers 'when' with a concrete 'Use when a marketing team wants to reach an existing engaged audience... or when testing a new channel before committing' clause.

5 / 5

Trigger Term Quality

The 'Use when' clause supplies good contextual triggers ('testing a new channel before committing', 'reach an existing engaged audience') but lacks the concrete natural keyword a user would say, like 'sponsor a newsletter', and misses synonyms; not the comprehensive anchor at 5.

4 / 5

Distinctiveness Conflict Risk

Occupies a clear niche (newsletter sponsorship discovery) with distinct triggers and minimal overlap risk with other skills; the ICP/budget framing is highly specific.

5 / 5

Total

19

/

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.

Validation15 / 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
gooseworks-ai/goose-skills
Reviewed

Table of Contents

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