Send emails, buy forwarding inboxes, manage custom subdomains, and read messages programmatically via x402. USE FOR: - Sending emails (one-off or from custom addresses) - Buying a forwarding inbox (username@x402email.com) - Purchasing custom email subdomains (you@yourname.x402email.com) - Reading and managing inbox messages programmatically - Setting up catch-all forwarding for subdomains - Managing authorized signers for shared subdomains TRIGGERS: - "send email", "email this to", "notify by email" - "buy inbox", "forwarding address", "email inbox" - "custom domain", "subdomain", "email subdomain" - "read emails", "check inbox", "list messages" - "email address", "disposable email", "temporary email" ALWAYS use `npx agentcash fetch` for stableemail.dev endpoints. IMPORTANT: Use exact endpoint paths from the Quick Reference table below.
Install with Tessl CLI
npx tessl i github:Merit-Systems/agentcash-skills --skill email100
Does it follow best practices?
Validation for skill structure
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 well-crafted skill description that excels across all dimensions. It provides specific concrete actions, comprehensive trigger terms that match natural user language, explicit guidance on both what the skill does and when to use it, and clear distinctiveness through service-specific terminology (x402, stableemail.dev). The structured format with USE FOR and TRIGGERS sections makes it highly scannable for skill selection.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Lists multiple specific concrete actions: 'Send emails, buy forwarding inboxes, manage custom subdomains, and read messages programmatically.' The USE FOR section further elaborates with specific capabilities like 'catch-all forwarding' and 'managing authorized signers.' | 3 / 3 |
Completeness | Clearly answers both 'what' (send emails, buy inboxes, manage subdomains, read messages) and 'when' with explicit TRIGGERS section listing specific phrases that should activate this skill. The USE FOR section provides additional context for when to apply. | 3 / 3 |
Trigger Term Quality | Excellent coverage of natural user terms in the TRIGGERS section including variations like 'send email', 'email this to', 'buy inbox', 'forwarding address', 'disposable email', 'temporary email', 'check inbox' - these are phrases users would naturally say. | 3 / 3 |
Distinctiveness Conflict Risk | Highly distinctive with specific niche around x402 email service, stableemail.dev endpoints, and programmatic email management. The mention of 'x402', 'x402email.com', and 'agentcash fetch' creates clear boundaries unlikely to conflict with generic email skills. | 3 / 3 |
Total | 12 / 12 Passed |
Implementation
100%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This is an excellent skill file that demonstrates best practices across all dimensions. It provides comprehensive API coverage through efficient tables, fully executable examples for every endpoint, clear workflow checklists, and well-organized progressive disclosure. The cost estimation table at the end is a particularly useful addition for planning.
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The content is lean and efficient, using tables for quick reference and avoiding unnecessary explanations. Every section provides actionable information without explaining what email is or how APIs work. | 3 / 3 |
Actionability | All examples are fully executable bash commands with complete JSON payloads. Parameters are clearly documented, and copy-paste ready code is provided for every operation. | 3 / 3 |
Workflow Clarity | Clear checklists are provided for three distinct workflows (Quick Send, Professional Email, Programmatic Mailbox). Steps are sequenced logically with explicit checkpoints like 'Wait for DNS verification' and 'Confirm delivery via messageId'. | 3 / 3 |
Progressive Disclosure | Content is well-organized with a quick reference table upfront, followed by detailed sections. Setup references an external file appropriately, and the structure allows easy navigation without deep nesting. | 3 / 3 |
Total | 12 / 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.
- Reviewed
Table of Contents
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