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Cover Letter Writer · jayrha | DecimalAI

productivityby jayrha

Cover Letter Writer

jayrha/cover-letter-writer

Source jayrha/agentskills ↗License MIT

Writes tailored, persuasive cover letters that connect a candidate's concrete achievements to a specific role and company — with a strong hook, evidence-backed body, and clear close.

SkillScore91Maintained

Automatic

Writing & Editing pack

Last verified 8/3/2026

What it changes

Passed 20 of 22 test cases with the skill, and 18 of 22 without it.

Without skill82%

With skill91%

Checks it passed that the model alone missed

The opening sentence does not start with generic boilerplate such as 'I am writing to apply'.
The opening paragraph connects Khan Academy's education mission with the candidate's 35% completion rate achievement.

2 fixed18 passed either way2 still failing0 broke

Pass-rate lift: +9 pp
Tokens: +30%
Agent turns: 0%
Response time: -14%

Model gemini-3.6-flashMeasured 8/3/2026v120 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/jayrha-cover-letter-writer/SKILL.md https://app.decimal.ai/s/jayrha-cover-letter-writer/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add jayrha-cover-letter-writer, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/jayrha-cover-letter-writer/ and pins it in .decimal/skills.lock

decimalai skills add jayrha-cover-letter-writer

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/jayrha-cover-letter-writer/SKILL.md https://app.decimal.ai/s/jayrha-cover-letter-writer/SKILL.md

Raw file: /s/jayrha-cover-letter-writer/SKILL.md ↗ · machine-readable summary at /s/jayrha-cover-letter-writer.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 2

Prompt

I am a Mid-Level UX Designer applying for a Principal Product Designer role at Khan Academy. While I don't have 10+ years of seniority, I deeply align with their free education mission and recently redesigned a learning platform that boosted student course completion by 35%. Draft my cover letter.

What was checked, without and with the skill
Checked	Without skill	With skill
The opening paragraph connects Khan Academy's education mission with the candidate's 35% completion rate achievement.	Missed	Passed
The opening sentence avoids generic phrases such as 'I am writing to apply for'.	Passed	Passed

case-08 · gemini-3.6-flash · 8/3/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md53 lines2 files

Cover Letter Writer

Overview

This skill writes a short, specific, genuinely persuasive cover letter that complements (never repeats) the resume. A good cover letter answers three questions fast: Why this company? Why this role? Why you? — backed by one or two concrete proof points.

Keywords: cover letter, motivation letter, letter of interest, application letter, Anschreiben, job application, career change, why this company.

When to use vs. not

Use this whenever a role asks for (or allows) a cover letter, or when the candidate needs to explain something a resume can't (a pivot, a gap, an unusual fit). Don't pad — if there's nothing role-specific to say, a tight 3-paragraph letter beats a generic page. Never fabricate enthusiasm with invented facts about the company; use real, verifiable specifics.

Inputs to gather first

The job description and company name.
The candidate's 2–3 strongest relevant achievements (ideally quantified).
One genuine reason they want this company/role (product, mission, team, problem).
Anything to address head-on: career change, gap, relocation, over/under-qualification.
Tone target: formal (finance/law/gov) vs. warm-professional (startup/creative).

Workflow

Research the hook. Find one specific, true thing about the company (a product, value, recent launch, problem they solve) the candidate authentically connects to. This becomes the opener. Generic "I am writing to apply for…" openers are dead on arrival.
Map proof to needs. Read the JD's top 3 requirements. Pick the candidate's achievements that directly answer them.
Write the opening (2–3 sentences). Name the role, lead with the hook or a punchy proof point. Make the reader want the next paragraph.
Write the body (1–2 short paragraphs). Each makes one claim about fit and backs it with a concrete, quantified example. Show impact, not a duty list. This is "the resume's greatest hits, with narrative."
Address the elephant (if any). One confident sentence on the gap/pivot/relocation — framed forward, never apologetic.
Close (2 sentences). Restate enthusiasm, state availability, and a light call to action ("I'd welcome the chance to discuss…"). Thank them.
Trim to ~250–350 words / under one page. Cut every sentence that could appear in any other letter.
Match format. Email body vs. attached letter; for DACH, follow the formal Anschreiben layout (sender/recipient blocks, date, subject line).

Decision framework

Situation	Emphasis
Strong direct fit	Lead with the single most relevant quantified win
Career change	Lead with transferable skills + why the pivot is deliberate, not random
Employment gap	One forward-framed sentence; spend the rest on value
Dream company, stretch role	Lead with genuine mission alignment + fastest-ramp evidence
Referral exists	Name the referrer in the first line

Worked example

See examples/career-change.md for a full letter from a teacher moving into UX research.

Best Practices

Track record

Benchmark

20 / 22

test cases passed, vs 18 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/1/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

jayrha / agentskills

cover-letter-writer/SKILL.md

View on GitHub ↗

License MITImported 8/1/2026Version v1Bundled 1 file

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

mohitagw15856/cover-letterWrite a specific, non-generic cover letter that connects your evidence to the role. Use when asked to write a cover letter, an application letter, or a note to accompany a resume. Produces a tight 3–4 paragraph letter — a real hook, two evidence paragraphs mapping your proof to the job's needs, and a confident close — tailored to the company, ready to export as a designed PDF.Close match+9 pp pass-rate lift

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Cover Letter Writer

Overview

When to use vs. not

Inputs to gather first

Workflow

Decision framework

Worked example

Best Practices

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills