verify-email

Verify if an email address is valid and deliverable

Quality

78%

Does it follow best practices?

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Adds up to 20 points to the overall score

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Securityby

Passed

No findings from the security scan

Fix and improve this skill with Tessl

tessl review fix ./skills/lead-generation/capabilities/verify-email/SKILL.md

Quality

Content

100%

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

The body is well-structured, concise, and highly actionable with executable curl examples, clear status-to-action mapping, and error handling. It is a strong, lean single-purpose skill with no significant weaknesses.

Dimension	Reasoning	Score
Conciseness	The body is lean, does not explain concepts Claude already knows, and every section (setup, curl calls, response fields, tips) earns its place; the only minor redundancy is the Examples section duplicating the Usage curls.	3 / 3
Actionability	Provides fully executable, copy-paste-ready curl commands with auth headers and concrete parameter examples for both Hunter and Tomba, matching the 'Fully executable code/commands; copy-paste ready' anchor.	3 / 3
Workflow Clarity	As a simple single-task skill the action is unambiguous, and the Result Types table acts as explicit validation checkpoints (valid/invalid/accept_all/unknown → action) plus an Error Handling section for recovery.	3 / 3
Progressive Disclosure	Content is well-organized into clear single-level sections with no nested references, and for a single-API skill with no bundle files the inline structure is appropriate and easy to navigate.	3 / 3
	Total	12 / 12 Passed

Description

57%

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 conveys a clear, distinct niche (email verification) with natural trigger terms, but it states only the 'what' and omits any explicit 'when to use' guidance. Adding a 'Use when...' clause would raise completeness and trigger coverage.

Suggestions

Add an explicit trigger clause, e.g. 'Use when verifying an email before sending, checking if an address is real, or cleaning an email list to avoid bounces.'

Broaden trigger terms to include natural user phrasings like 'is this email real', 'check for bounces', and 'validate an email address'.

List concrete actions (syntax check, domain/MX verification, mailbox check) to lift specificity from a single verb to multiple specific actions.

Dimension	Reasoning	Score
Specificity	Names the email domain and concrete qualities ("valid and deliverable") but uses a single action verb rather than listing multiple specific actions, matching the 'Names domain and some actions, but not comprehensive' anchor.	2 / 3
Completeness	It clearly states what the skill does (verify an email is valid and deliverable) but provides no 'Use when...' trigger clause, so per the rubric guideline completeness is capped at 2.	2 / 3
Trigger Term Quality	"email address", "valid", and "deliverable" are natural terms a user might say, but common variations like "real email", "bounce", or "email list" are missing, fitting the 'Some relevant keywords but missing common variations' anchor.	2 / 3
Distinctiveness Conflict Risk	Email deliverability verification is a clear niche with distinct triggers unlikely to conflict with other skills, matching the 'Clear niche with distinct triggers' anchor.	3 / 3
	Total	9 / 12 Passed

Validation

93%

Warnings & errors only

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

Criteria	Description	Result
frontmatter_unknown_keys	Unknown frontmatter key(s) found; consider removing or moving to metadata	Warning

	Total	15 / 16 Passed

Repository: gooseworks-ai/goose-skills
Path: skills/lead-generation/capabilities/verify-email/SKILL.md
Commit: 8866b2a

Reviewed: 1 day ago

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