postmark-send-email
Use when sending transactional or broadcast emails through Postmark — single sends, batch (up to 500), bulk, or template-based emails with support for attachments, tracking, and message streams.
91
86%
Does it follow best practices?
Impact
99%
2.15xAverage score across 3 eval scenarios
Passed
No known issues
Quality
Discovery
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.
This is a strong skill description that clearly identifies the tool (Postmark), the actions (sending various types of emails), and when to use it. It uses third person voice appropriately and includes specific, natural trigger terms. The description is concise yet comprehensive, covering the key capabilities and use cases without unnecessary verbosity.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Lists multiple specific concrete actions: single sends, batch (up to 500), bulk, template-based emails, with support for attachments, tracking, and message streams. These are concrete, actionable capabilities. | 3 / 3 |
Completeness | Explicitly answers both what (sending transactional/broadcast emails with various modes and features) and when ('Use when sending... through Postmark') with a clear 'Use when' clause at the start. | 3 / 3 |
Trigger Term Quality | Includes strong natural keywords users would say: 'emails', 'Postmark', 'transactional', 'broadcast', 'batch', 'template-based', 'attachments', 'tracking', 'message streams'. Good coverage of terms a user working with Postmark email sending would naturally use. | 3 / 3 |
Distinctiveness Conflict Risk | Clearly scoped to Postmark email sending specifically, with distinct triggers like 'Postmark', 'message streams', 'transactional', and 'broadcast'. Unlikely to conflict with generic email skills or other email provider skills. | 3 / 3 |
Total | 12 / 12 Passed |
Implementation
72%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This is a well-structured, highly actionable skill that covers Postmark's email sending capabilities comprehensively. Its strengths are excellent progressive disclosure with clear references to supporting files, concrete executable examples, and thorough error handling guidance. The main weaknesses are moderate verbosity (some redundancy in limits/constraints and parameter tables that could be tightened) and a lack of explicit validation checkpoints in the workflow for batch/bulk operations.
Suggestions
Trim redundant information like size limits that appear in both the overview table and the attachments section — consolidate into one location.
Add an explicit pre-send validation checklist or workflow (e.g., verify domain → test with sandbox → send single test → scale to batch) to improve workflow clarity for batch/bulk operations.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The skill is fairly comprehensive but includes some redundancy (e.g., size limits repeated in the overview table and attachments section, MessageStream emphasized multiple times). Some tables like the full optional parameters list could be trimmed since Claude knows standard email parameters. However, most content is reference-worthy and not padded with basic explanations. | 2 / 3 |
Actionability | Provides fully executable JavaScript code examples for single, batch, and template sends, plus JSON examples for attachments and tracking. The retry pattern is copy-paste ready, error codes have specific actions, and testing methods are concrete with exact addresses/tokens. | 3 / 3 |
Workflow Clarity | The Quick Start provides a 4-step sequence, and the error handling includes retry logic with backoff. However, there's no explicit validation workflow (e.g., verify sender before sending, test with sandbox first, then production). The batch section mentions handling partial failures but doesn't provide a complete validate-fix-retry workflow for batch operations. | 2 / 3 |
Progressive Disclosure | Excellent use of progressive disclosure with a clear overview and well-signaled one-level-deep references to separate files (single-email-examples.md, batch-email-examples.md, template-examples.md, error-handling.md, smtp-migration.md, installation.md). The main file covers essentials while pointing to detailed resources for language-specific examples and advanced patterns. | 3 / 3 |
Total | 10 / 12 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.
Validation — 11 / 11 Passed
Validation for skill structure
No warnings or errors.
- Repository
- ActiveCampaign/postmark-skills
- Commit
73ea6bf
- Reviewed
Table of Contents
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