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-inspectnpx skills add sinch/sinch-plugins --skill mailgun-inspectgit 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-inspect)<a href="https://agentmods.dev/skills/sinch/sinch-plugins/mailgun-inspect"><img src="https://agentmods.dev/badge/skills/sinch/sinch-plugins/mailgun-inspect.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 5.1 | $0.00046 | $0.03141 |
| Opus 5 | $0.00023 | $0.01571 |
| Sonnet 5 | $0.00009 | $0.00628 |
| Haiku 4.5 | $0.00005 | $0.00314 |
Grade A, and why
sinch-mailgun-inspect 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 6d 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.
4. **Language** — any language, or curl. This API is REST-only; there is no SDK wrapper. This is a copy
100% identical to sinch-mailgun-inspect — 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 — 211 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mailgun Inspect
Overview
Mailgun Inspect (by Sinch) is an email pre-send quality control API. Five capabilities:
| Capability | Base Path | Input |
|---|---|---|
| Accessibility | /v1/inspect/accessibility |
html + encoded |
| Link Validation | /v1/inspect/links |
links URL array (or /html-validate for HTML) |
| Image Validation | /v1/inspect/images |
links URL array (or /html-validate / /upload) |
| Code Analysis | /v1/inspect/analyze |
html (no encoded field) |
| Email Previews | /v1/preview/tests (V1) / /v2/preview/tests (V2) |
varies |
(Summary only — confirm exact names/encoding/enums against the authoritative API Reference (Markdown) doc before implementing.)
For full endpoint tables and request schemas, see references/api-endpoints.md.
Agent Instructions
Before generating code, gather from the user (skip any item already specified in the prompt or context):
- Scope — broad QC (run all four HTML-based tests in parallel) or a specific capability (e.g. "check links" → run only that one)?
- Input method — raw HTML, a list of URLs, or an image file? Route to the correct endpoint per the capability table.
- Region — US or EU? Must match the user's Mailgun account.
- Language — any language, or curl. This API is REST-only; there is no SDK wrapper.
Product gotchas to apply unconditionally:
- Always poll — test-creation POST endpoints are typically async; poll GET until status is
"Complete"or"Completed"; treat"Failed"as terminal error. - V2 preview shortcut —
POST /v2/preview/testscan trigger accessibility, link validation, image validation, and code analysis in a single call by adding content-checking fields to the body. Use this when the user wants previews + quality checks together.
Refer to the API references linked in Links for request/response schemas.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 6d ago First seen · 211 lines · 46 tokens per session scan A a36e6a59ad2b
sinch-mailgun-inspect is a skill published in the GitHub repository sinch/sinch-plugins (6 stars, last pushed 24d ago), licensed Apache-2.0. It adds 46 tokens to every session and 3,141 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-inspect, differing in 0 lines, and is treated as a copy.
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