deliverability-check SKILL.md skillA
deliverability-check from cognyai/claude-code-marketing-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add cognyai/claude-code-marketing-skills/deliverability-check@v1.1.1Pins v1.1.1 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- cognyai/claude-code-marketing-skills
- Path
skills/deliverability-check/SKILL.md- Versions recorded
- 2
- Latest version
- v1.1.1, committed Oct 12, 2026
- First version recorded
- Apr 22, 2026
- Size
- 13,563 bytes
- Repository stars
- 114
- License
- none declared
Audit a sending domain's deliverability — SPF, DKIM, DMARC, MX, BIMI, blocklists — with a prioritized fix order.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Deliverability Check
Audit a sending domain's email authentication and deliverability posture. Explains every finding in plain English and outputs a prioritized fix order — critical for anyone whose open rate dropped and doesn't know why.
## Usage
`/deliverability-check brand.com` — audit the domain
`/deliverability-check brand.com news.brand.com` — include a sending subdomain
## Works with
Steps 1–9 need only DNS and the web: zero accounts. If an ESP is connected through Cogny (`mcp__cogny__list_integrations`), Step 8b adds the bounce, complaint and unsubscribe rates that DNS can't show.
| ESP (Prefix) | Recent sends | Bounce / complaint / unsub numbers | Notes |
|--------------|--------------|------------------------------------|-------|
| Klaviyo (`Klaviyo`) | `list_campaigns` | `get_campaign_values_report` (`statistics: ["bounce_rate","spam_complaint_rate","unsubscribe_rate","delivery_rate"]`, `timeframe: {"key": "last_30_days"}`) | |
| Mailchimp (`Mailchimp`) | `tool_list_reports` | `tool_get_report` (bounces, abuse reports, unsubscribes) | |
| Rule (`Rule`) | `tool_list_campaigns` | `tool_get_campaign_statistics`; `tool_list_suppressions` for suppression growth | |
…Read the whole file at its exact version.
How to install
mdr add cognyai/claude-code-marketing-skills/deliverability-check@sha256:4eb99f5a1c877c5fThe line at the top of this page pins the label v1.1.1, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_xadmdmcvxjw2p4gs)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Apr 22, 2026 and Oct 12, 2026, about one every 173 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.1.1 latest | 2026-10-12 | 19f93c6 | 13,563 B | A | view · diff |
| v1.0.0 | 2026-04-22 | 195609e | 6,141 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (13563 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
cognyai/claude-code-marketing-skills · 114 stars · license none declared · pushed 2026-10-12 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xadmdmcvxjw2p4gs GET https://markdownregistry.com/api/v1/resolve?ref=cognyai/claude-code-marketing-skills/deliverability-check GET https://markdownregistry.com/api/v1/blob/4eb99f5a1c877c5f52b455f1b54a8ccff9a9897577fa4768fb99fd792cd8abec
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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