subject-line-writer SKILL.md skillA
subject-line-writer from prosyo-ai/gtm-skill is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add prosyo-ai/gtm-skill/subject-line-writer@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- prosyo-ai/gtm-skill
- Path
plugin/skills/subject-line-writer/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0.0, committed Oct 23, 2026
- Size
- 3,600 bytes
- Repository stars
- 13
- License
- MIT
Use this skill when you need cold email subject lines that get opened and do not look like marketing: "write subject lines for this email", "my open rates are low", "A/B test subject lines". Writes short, lowercase, internal-looking subject lines matched to the email's angle, explains the pattern behind each, flags spam and clickbait risks, and sets up a fair subject-line test. For cold outreach, follow-ups and re-engagement emails.
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
Use this after the email is written. The subject line's job is to get the email opened by the right person without promising something the body does not deliver. ## Inputs - The email body (subject lines are written for a specific email, never in a vacuum). - The persona and seniority. - The trigger or angle the email uses. ## The play ### 1. Write in the patterns that work for cold B2B | Pattern | Example | When | | --- | --- | --- | | Topic, two to four words | "month-end close" | Default | | Trigger reference | "new sdr team", "the series b" | Email leads with a trigger | | Peer or customer | "contoso's close" | Strong, approved proof | | Question | "manual reconciliations?" | Pain is very common | | Their initiative | "europe expansion" | Announced plan | | Mutual context (only if real) | "maria suggested i reach out" | Genuine referral | ### 2. Follow the format rules - 1 to 5 words; under 40 characters so it is not cut on phones. - Lowercase or sentence case; it should look like it came from a colleague. - No first-name merge field in the subject (it reads as automated), no emojis, no exclamation marks, no "quick question". …
Read the whole file at its exact version.
How to install
mdr add prosyo-ai/gtm-skill/subject-line-writer@sha256:1a156f41155110a0The line at the top of this page pins the label v1.0.0, 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_eqjz4uxp45gvr4k4)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Oct 23, 2026.
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 (3600 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
prosyo-ai/gtm-skill · 13 stars · license MIT · pushed 2026-10-26 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_eqjz4uxp45gvr4k4 GET https://markdownregistry.com/api/v1/resolve?ref=prosyo-ai/gtm-skill/subject-line-writer GET https://markdownregistry.com/api/v1/blob/1a156f41155110a0f9c278c1c50dbf2640d899ee9de0cd466194f709b731c563
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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