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superhuman-mail

Use Superhuman Mail MCP for email and calendar workflows such as searching inboxes, reading threads, drafting or sending mail, managing labels, checking read statuses, finding availability, and creating or updating events.

64

Quality

76%

Does it follow best practices?

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SecuritybySnyk

Low

Low-risk findings worth noting

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tessl review fix ./skills/superhuman-mail/SKILL.md
SKILL.md
Quality
Evals
Security

Quality

Content

78%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 concise, well-structured MCP-wrapper skill with concrete safety/decision rules and an explicit destructive-action confirmation checkpoint. The main weakness is mild redundancy between the description and the Common Capabilities list.

DimensionReasoningScore

Conciseness

Lean and assumes Claude's competence (no explaining what email or MCP is), but the 'Common Capabilities' bullet list substantially re-lists actions already named in the frontmatter description, adding mild redundancy.

4 / 5

Actionability

Gives concrete, executable behavioral rules ('summarize the intended action and get user confirmation before calling the tool', 'Prefer creating or updating drafts before sending when ... ambiguous', 'ask which account to use'), with only minor gaps such as no example confirmation prompt.

4 / 5

Workflow Clarity

Five clearly sequenced workflow steps with an explicit validation checkpoint for destructive/write actions in step 3 (confirmation gate) and a safe-default in step 4; minor gap is the lack of an explicit retry/re-confirm loop after a failed tool call.

4 / 5

Progressive Disclosure

Under 50 lines with no external references needed, organized into clearly labeled sections (Workflow, Common Capabilities, Safety Notes) — meeting the simple-skill exception for a top progressive_disclosure score.

5 / 5

Total

17

/

20

Passed

Description

75%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 specific, capability-rich description tied to a distinct product, but it omits an explicit 'Use when...' trigger clause, which caps its completeness. Adding a concrete trigger sentence would lift the weakest dimension.

Suggestions

Append an explicit trigger clause such as 'Use when the user asks to search, read, send, or organize Superhuman email, or to manage calendar events and availability.'

Add natural synonyms users say ('meetings', 'schedule', 'inbox', 'contacts') to broaden trigger coverage.

Keep the third-person imperative voice already in use; only the missing 'when' guidance holds completeness back.

DimensionReasoningScore

Specificity

Lists multiple concrete actions — 'searching inboxes, reading threads, drafting or sending mail, managing labels, checking read statuses, finding availability, and creating or updating events' — giving comprehensive coverage rather than vague abstractions.

5 / 5

Completeness

The 'what' is clearly and comprehensively stated, but there is no 'Use when...' clause or equivalent explicit trigger guidance, which per the rubric caps completeness at 3.

3 / 5

Trigger Term Quality

Strong natural keywords ('email', 'calendar', 'inboxes', 'threads', 'mail', 'labels', 'read statuses', 'availability', 'events') but misses common synonyms a user might say such as 'meetings', 'schedule', or 'contacts'.

4 / 5

Distinctiveness Conflict Risk

It is scoped to the specific 'Superhuman Mail MCP' product with distinct email/calendar triggers, giving it a clear niche with minimal conflict risk against other skills.

5 / 5

Total

17

/

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
superhuman/mcp-mail
Reviewed

Table of Contents

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