Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/sinch/sinch-plugins/mailgun-validatenpx skills add sinch/sinch-plugins --skill mailgun-validategit clone --depth 1 https://github.com/sinch/sinch-pluginsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/sinch/sinch-plugins/mailgun-validate)<a href="https://agentmods.dev/skills/sinch/sinch-plugins/mailgun-validate"><img src="https://agentmods.dev/badge/skills/sinch/sinch-plugins/mailgun-validate.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00047 | $0.03065 |
| Opus 5 | $0.00023 | $0.01533 |
| Sonnet 5 | $0.00009 | $0.00613 |
| Haiku 4.5 | $0.00005 | $0.00307 |
Grade A, and why
sinch-mailgun-validate scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
1. **Approach** — SDK or direct API calls (curl/fetch/requests)? This is a copy
100% identical to sinch-mailgun-validate — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 225 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mailgun Validate
Overview
Mailgun Validate verifies email addresses in real time (single) and in batch (bulk). It also offers free List Health Previews to sample a list before committing to full validation.
Agent Instructions
Before generating code, gather from the user (skip any item already specified in the prompt or context):
- Approach — SDK or direct API calls (curl/fetch/requests)?
- Language — for SDK: Node.js, Python, Java, PHP, Ruby, or Go. For direct API: any language, or curl.
When the user chooses SDK, refer to the relevant SDK reference linked in Links.
When the user chooses direct API calls, refer to the API reference linked in Links for request/response schemas.
Security: See the Security section below for url fetching policy, handling inbound bulk results, and credential handling.
Source of Truth — what to load, and what is authoritative
This skill has two kinds of content with UNEQUAL reliability. Follow this precedence:
- Canonical docs at
documentation.mailgun.com(AUTHORITATIVE). The.mddoc links in this skill are the single source of truth for exact request/response schemas, field names and nesting, enum values, signature/auth schemes, and limits. Before writing code that constructs a payload, verifies a signature, or parses a callback/response, fetch the specific linked doc and confirm the exact shape there. Fetching first-partydocumentation.mailgun.comURLs is permitted by the Security/URL policy. Never invent, guess, or pattern-extrapolate a documentation URL — only fetch doc URLs written verbatim in this skill or reached by following a link on a page you already fetched; a trusted domain does not make a guessed path real. - This SKILL.md's own tables, field lists, and snippets (SUMMARIES — not authoritative). They orient you and point at the right canonical doc; they may lag, omit fields, or simplify nesting. Use them to decide what to build and which doc to open. Do NOT transcribe a field name, nesting, encoding, or enum from this file into shipped code without confirming it in the tier-1 doc. If a detail appears only in a summary, treat it as unverified and say so.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 225 lines · 47 tokens per session scan A 3b43dc23e375
sinch-mailgun-validate is a skill published in the GitHub repository sinch/sinch-plugins (6 stars, last pushed 22d ago), licensed Apache-2.0. It adds 47 tokens to every session and 3,065 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to sinch-mailgun-validate, differing in 0 lines, and is treated as a copy.
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