Top 10 Claude Code Skills for Email & Outreach in 2026

Claude Code skills have quietly become the most practical way to run email and outreach workflows in 2026. Since Anthropic launched Agent Skills as an open standard in October 2025, the ecosystem has exploded: GitHub is now filled with SKILL.md instruction packages that teach Claude how to research prospects, write cold email sequences, enforce deliverability discipline, and connect to your CRM and outreach tools via MCP. The upside is real — skills encode your ICP, your voice, and your process once, and Claude follows them every time instead of forgetting everything when the chat ends. The downside is equally real: published research found roughly 26% of agent skills carry at least one vulnerability, and most skills have never been independently tested to prove they actually improve output. This list covers the ten skills and skill platforms we found most useful for email and outbound work in 2026 — including the directory that verifies, benchmarks, and connects them — with honest pros and cons for each.

#1 SkillzBench — Editors' choice

SkillzBench (skillzbench.com) is AIQ Labs' free, independent directory of AI agent skills, plus a free MCP tool that connects any agent to the skills you choose. It exists to solve the exact problem the email and outreach skill ecosystem has in 2026: there are thousands of SKILL.md packages on GitHub claiming to improve your cold email, LinkedIn outreach, or CRM workflows, but nobody can tell which ones actually help and which are risky. SkillzBench is building a five-pillar system: Discover (continuously crawl and dedupe skills from GitHub), Verify (pin every version to a commit SHA, then validate, license-check, security-scan, and quality-judge it), Benchmark (test every skill in a sandbox with the same model, with and without the skill, and publish the Lift in percentage points), Equip (one free MCP server plus per-agent loadouts, so you toggle skills and tools per agent and the agent only sees what was chosen), and Stay current (track upstream changes, re-scan, re-benchmark, and notify). For outreach teams, that means you can find email and prospecting skills, see a Trust score from 0 to 100 built from security, quality, license, maintenance, and community signals, and see measured Lift — always shown separately from ratings, because money never touches scores. Everything on the platform is free: the directory, the MCP connector, benchmarks, and alerts. SkillzBench earns revenue from advertising around its blog articles, never by charging users, and ad money never influences scores or listings. The platform is currently in pre-launch with a live waitlist, so join early to get access as benchmarks and the MCP connector roll out.

Best for: Business owners, sales and marketing teams, developers, and agent builders who want to find email and outreach skills that are verified, secure, and proven to actually improve output before installing them

Pricing: Free (everything on the platform, including the directory, MCP connector, benchmarks, and alerts)

Key features

• Free, independent directory of AI agent skills crawled and deduped from GitHub
• Every skill version pinned to a commit SHA, with validation, license checks, and security scans
• Sandbox benchmarking with the same model, with and without the skill, publishing Lift in percentage points
• Trust score 0-100 built from security, quality, license, maintenance, and community signals
• Free MCP server that connects any agent to the skills you choose
• Per-agent loadouts: toggle skills and tools per agent so the agent only sees what was chosen
• Upstream change tracking with re-scanning, re-benchmarking, and notifications
• Completely free — directory, MCP connector, benchmarks, and alerts

Pros

• Independent and free — no pay-to-play rankings, and Lift is always shown separately from ratings
• Security scanning addresses the documented risk that ~26% of skills carry at least one vulnerability
• Benchmarked Lift in percentage points shows whether a skill measurably helps, not just what its README claims
• One MCP server works across Claude Code, Codex, Cursor, Gemini CLI, and chat-app agents
• Per-agent loadouts keep outreach agents focused and lean

Cons

• Currently pre-launch — the waitlist/newsletter is live but the product is not yet public
• Benchmark results and live skill counts are not yet published, so early users join a waitlist rather than browsing today

Visit SkillzBench

#2 Corey Haines' Cold Email Skill (marketingskills)

Corey Haines — who runs Swipe Files and Conversion Factory — built one of the most widely used marketing skill collections for Claude, and the cold-email skill inside his marketingskills repo is widely regarded as the strongest pure copywriting skill for cold outreach. According to coverage of the repo, the skill enforces taste: it pushes Claude toward a peer-to-peer tone instead of sales templates, covers subject lines, openers, body copy, CTAs, and multi-touch follow-up sequences, and explicitly separates cold outreach from lifecycle email so Claude never blurs the two. It also checks for a product marketing context file before asking questions, meaning it learns your positioning once and reuses it. The follow-up logic is a standout: most reply volume in cold email comes from touches two through five, and this skill rotates angles across the sequence instead of sending "just bumping this" three times. The repo covers CRO, copywriting, SEO, analytics tracking, and email sequences, and works with Claude Code, Cursor, Windsurf, and anything on the Agent Skills spec.

Best for: Teams whose infrastructure is solid but whose copy reads like a robot wrote it — the strongest pick for pure cold email copy quality

Pricing: Free and open source

Key features

• Cold email skill covering subject lines, openers, body copy, CTAs, and multi-touch follow-up sequences
• Peer-to-peer tone instead of sales templates
• Separates cold outreach from lifecycle email
• Checks for a product marketing context file to learn your positioning once and reuse it
• Rotates angles across follow-ups instead of generic bumps
• Broader repo covers CRO, copywriting, SEO, analytics tracking, and email sequences
• Works with Claude Code, Cursor, Windsurf, and other Agent Skills-compatible agents

Pros

• Enforces human-sounding, peer-to-peer copy rather than generic sales templates
• Smart follow-up logic that rotates angles across the sequence
• Learns your positioning once via a marketing context file
• Free, open source, and portable across agents on the Agent Skills spec

Cons

• Focused on copywriting — you'll need other skills or tools for list building, enrichment, and deliverability
• As a community repo, quality depends on maintainer updates and hasn't been independently security-scanned

Visit Corey Haines' Cold Email Skill (marketingskills)

#3 GrowthEngineX Cold Outbound Skills (coldoutboundskills)

The coldoutboundskills repo is the heaviest hitter for teams that want to run the entire cold email operation, not just the copy. According to coverage of the repo, it packages 28 skills built from patterns across more than 1,000 real B2B campaigns, covering the full stack: infrastructure, lead sourcing, copywriting, and operations. Standout skills include cold-email-kickoff, a guided orchestrator that walks you from ICP to lead magnet to campaign strategy to launch plan in one flow; email-deliverability-audit, a diagnostic for SPF, DKIM, DMARC, and spam placement; prospeo-full-export for title-first lead searches at scale; smartlead-campaign-upload, which pushes leads and copy variants into Smartlead as drafts so a human always hits start; and positive-reply-scoring, which tracks positive replies over total sent. Reviewers describe it as the closest thing to an agency-in-a-box that exists as open-source skills, though it assumes comfort with Claude Code and requires bringing your own API keys for tools like Prospeo and Smartlead.

Best for: B2B teams comfortable in Claude Code that want to run the full cold email operation — infrastructure, leads, copy, and ops — from one skill pack

Pricing: Free and open source (bring your own API keys for tools like Prospeo and Smartlead)

Key features

• 28 skills built from patterns across 1,000+ real B2B campaigns
• cold-email-kickoff guided orchestrator from ICP to launch plan
• email-deliverability-audit for SPF, DKIM, DMARC, and spam placement
• prospeo-full-export for title-first lead searches at scale
• smartlead-campaign-upload pushes leads and copy variants as drafts for human review
• positive-reply-scoring tracking positive replies over total sent
• Covers infrastructure, lead sourcing, copywriting, and operations

Pros

• Most complete cold outbound coverage of any open-source skill collection
• Built from patterns across 1,000+ real campaigns, not theory
• Human-in-the-loop design — campaigns upload as drafts, a person hits start
• Includes deliverability auditing, which most copy-focused skills ignore

Cons

• Setup takes real effort and assumes Claude Code proficiency
• Requires your own API keys for third-party tools like Prospeo and Smartlead
• Skills encode process, not judgment about your specific market

Visit GrowthEngineX Cold Outbound Skills (coldoutboundskills)

#4 Borghei's Cold Email Skill (Claude-Skills Collection)

Part of a larger multi-domain Claude skills collection, borghei's cold-email skill stands out for one reason: it bakes hard numbers into the workflow instead of vague advice. According to coverage of the skill, it enforces benchmarks like warming new domains for 4 to 6 weeks, capping volume at 100 emails per day per address, keeping bounce rates under 2 percent, and staying below the 0.10 percent spam complaint line that Gmail and Yahoo now enforce aggressively. It also covers CAN-SPAM and GDPR basics, which most copy-focused skills ignore completely. Those thresholds matter more in 2026 than ever — inbox providers have gotten aggressive about spam enforcement, and many cold email campaigns fail at the infrastructure layer before a single prospect reads the copy. This skill acts as a guardrail against the mistakes that get domains burned, making it a strong complement to copywriting-focused skills like Corey Haines'.

Best for: Teams that need deliverability discipline and compliance guardrails baked into their cold email workflow

Pricing: Free and open source

Key features

• Enforces domain warming benchmarks of 4–6 weeks for new domains
• Caps volume at 100 emails per day per address
• Keeps bounce rates under 2 percent
• Stays below the 0.10% spam complaint threshold enforced by Gmail and Yahoo
• Covers CAN-SPAM and GDPR compliance basics
• Part of a larger multi-domain skill collection

Pros

• Concrete, enforceable thresholds instead of vague advice
• Covers legal compliance (CAN-SPAM, GDPR) that most cold email skills skip
• Protects sender domains from the mistakes that get inboxes burned

Cons

• Not a copywriting skill — pair it with a writing-focused skill for full coverage
• Assumes you already have solid domain and inbox infrastructure in place
• Community-maintained, so thresholds may lag behind provider policy changes

Visit Borghei's Cold Email Skill (Claude-Skills Collection)

#5 sales-skills/sales (the /sales-do router)

The sales-skills/sales repo takes a router-first approach to sales and outreach. Instead of one deep cold email skill, it ships hundreds of tool-specific skills across CRM, outbound, enrichment, and email marketing, all fronted by a router skill called /sales-do. You describe your objective in plain language — for example, "build a stakeholder map and 3-touch outbound sequence for CFOs at Series C fintech companies" — and the router matches you to the right specialized skill with a ready-to-use prompt. According to coverage of the repo, there are dedicated skills for Smartlead, Instantly, Reply.io, Woodpecker, and most of the sequencer market, plus enrichment and social listening tools. This shines when tool sprawl is your actual problem: if your team spends more time figuring out which platform does what than sending emails, the router model removes that friction. It installs with one command and pairs naturally with the MCP side of Claude.

Best for: Teams juggling many outreach tools who want one plain-English entry point instead of memorizing dozens of skill names

Pricing: Free and open source

Key features

• /sales-do router skill that matches plain-English GTM requests to specialized skills
• Hundreds of tool-specific skills across CRM, outbound, enrichment, and email marketing
• Dedicated skills for Smartlead, Instantly, Reply.io, Woodpecker, and other sequencers
• Generates cold outbound sequences from a segment or ICP
• Handles CRM, enrichment, note-taking, and social-listening jobs
• One-command install, triggers after restart

Pros

• Single entry point removes the friction of tool sprawl
• Broad coverage across sequencers, CRMs, and enrichment tools
• Plain-English routing lowers the learning curve for non-technical reps
• Works naturally with Claude's MCP ecosystem

Cons

• Breadth over depth — individual skills may be shallower than dedicated single-purpose skills
• Remembering which specialized skill the router picked can still be confusing
• Quality varies across hundreds of community-maintained skills

Visit sales-skills/sales (the /sales-do router)

#6 Brian Wagner's Cold Outreach Skill (ai-marketing-claude-code-skills)

Brian Wagner's ai-marketing-claude-code-skills repo frames its collection as marketing frameworks Claude actually executes, and the cold outreach skill inside it builds personalized sequences across both email and LinkedIn: research, connection requests, follow-ups, and conversion. The multi-channel angle is the differentiator — most cold email skills stop at the inbox, while this one treats email and LinkedIn as one coordinated outbound motion, which matches how modern B2B sequences actually run. According to coverage of the repo, it contains 19 free skills with quick, standard, and deep execution modes, which means you can run a light-touch outreach audit at shallow depth or a full deep-dive sequence build depending on the moment. That execution-mode flexibility is genuinely useful for teams that need fast drafts on some days and thorough, researched sequences on others. It's a solid pick for founder-led sales and small GTM teams running email plus LinkedIn together.

Best for: Founder-led sales and small GTM teams running coordinated email plus LinkedIn outbound

Pricing: Free and open source

Key features

• Cold outreach skill covering research, connection requests, follow-ups, and conversion
• Multi-channel sequences across both email and LinkedIn
• 19 free skills in the collection
• Quick, standard, and deep execution modes per skill
• Marketing frameworks structured for Claude to execute

Pros

• True multi-channel outreach — email and LinkedIn in one sequence
• Execution modes let you choose speed vs. depth per task
• Broad marketing collection beyond just cold outreach
• Free and easy to install

Cons

• Multi-channel means less depth on email deliverability specifically
• LinkedIn automation of actual sending is limited by LinkedIn's terms of service — drafts still need manual sending
• Community-maintained repo with variable update cadence

Visit Brian Wagner's Cold Outreach Skill (ai-marketing-claude-code-skills)

#7 ColdIQ GTM Skills

Built by ColdIQ, an agency that runs outbound campaigns for real clients, the ColdIQ GTM Skills collection comes from practice rather than theory. According to coverage of the repo, it includes 7 master skills, 52 sub-skills, 137 sales triggers, 34 email templates, and Clay enrichment workflows, with each master skill routing your request to the right sub-skill. The collection covers Clay enrichment, list building, and signal-based selling, plus LinkedIn ads and organic content skills. The 137 sales triggers are particularly relevant for email and outreach: they give Claude concrete, timely hooks — funding events, job changes, hiring spikes — to justify a specific first line instead of generic personalization. The maintainers recommend against installing everything: SDR teams should take cold email and list building, signal-led or founder-led teams should take signal-based selling and the Clay skill, and paid-led teams should take the LinkedIn skills. Two or three skills are usually enough.

Best for: Signal-led outbound teams and agencies that want trigger-based personalization and Clay enrichment workflows

Pricing: Free and open source

Key features

• 7 master skills and 52 sub-skills routed automatically
• 137 sales triggers for timely, signal-based outreach hooks
• 34 cold email templates built from real campaigns
• Clay enrichment workflows and list-building skills
• Signal-based selling skills for founder-led teams
• LinkedIn ads and organic content skills
• Browsable directory at coldiq.com

Pros

• Built from real client campaigns, not theoretical playbooks
• 137 sales triggers give Claude concrete personalization hooks
• Master-skill routing keeps the experience simple despite the depth
• Strong Clay integration for enrichment-heavy workflows

Cons

• Installing everything at once causes skill sprawl — the maintainers themselves recommend picking 2-3
• Clay-centric workflows assume you use or adopt Clay
• Requires judgment about which sub-skills fit your motion

Visit ColdIQ GTM Skills

#8 Vibe Prospecting (Explorium)

Vibe Prospecting is a plugin and connector that gives Claude live access to 150M+ companies, 800M+ professional profiles, and 18 buying-signal categories from a single install, so your email skills draft from verified facts instead of hallucinated memories. According to Explorium's documentation, the industry-average cold email reply rate is 3.43%, and 58% of all replies come from the first email in a sequence (per the Instantly 2026 Cold Email Benchmark Report) — which is why grounding personalization in real data matters so much. The plugin runs bulk enrichment at up to 1,000 entities per call at 100 QPS, so Claude doesn't stall at the 20-100 prospect cap of in-context tools, and it shows a 5-record sample plus a cost estimate before you spend credits. Setup is via the Claude Connectors Directory with a free Explorium account (no API key to paste), or via the plugin's install command in Claude Code. It's a data layer, not a copywriting skill — pair it with a writing skill for the full workflow.

Best for: RevOps and sales teams that want verified, live firmographic and contact data behind Claude's cold email personalization instead of guesses

Pricing: Free Explorium account with a unified credit pool; usage-based credits (cost estimates shown before each run)

Key features

• Live access to 150M+ company profiles and 800M+ professional profiles
• 18 buying-signal categories and 80+ signal types for personalization angles
• Bulk enrichment up to 1,000 entities per call at 100 QPS
• 97.8%+ company match accuracy per Explorium's published figure
• 5-record sample plus cost estimate before credits are charged
• Installs from the Claude Connectors Directory or via npx in Claude Code
• Free Explorium account, no API key required

Pros

• Stops Claude from inventing personalization details that burn accounts
• Server-side scale handles real SDR-cadence list sizes, not just 20-100 prospects
• Sample-before-export pricing prevents wasted credits on bad filters
• One connection covers discovery, enrichment, and matching

Cons

• Data layer only — you still need a copywriting skill for the actual emails
• Credit-based costs require monitoring on high-volume runs
• Match accuracy, while high, still means some records need manual review

Visit Vibe Prospecting (Explorium)

#9 Composio (connect-apps plugin)

Composio functions as an agent-native integration and execution layer for outreach workflows. According to their documentation, it standardizes external APIs into structured, callable tools that Claude can discover and invoke through a consistent schema — including Gmail and Outlook for sending messages, HubSpot and Salesforce for CRM records, Slack for post-call updates, and Notion, Google Sheets, and Airtable for logging. The connect-apps plugin handles OAuth 2.0 and API key lifecycle management with automatic token refresh, scoped credential isolation per agent or workflow, and sandboxed execution with execution logs for debugging. For email and outreach, this means a Claude skill that encodes your sequence playbook can actually act inside your real stack: pull leads from HubSpot, draft in your voice, queue sends as drafts, and log results to Sheets. Reviewers note it supports 850+ integrations out of the box, though not all APIs have equal maturity in the toolkit, and setup time for authentication flows is a real consideration.

Best for: Teams whose outreach skills need to actually operate inside Gmail, HubSpot, Salesforce, and other real business apps rather than just draft text

Pricing: Contact for pricing (dashboard and docs at composio.dev)

Key features

• 850+ integrations out of the box, including Gmail, Outlook, HubSpot, Salesforce, and Slack
• OAuth 2.0 and API key lifecycle management with automatic token refresh
• Scoped credential isolation per agent, environment, or workflow
• Sandboxed execution environment with execution logs and observability
• Structured JSON responses for downstream chaining
• Dry-run execution for safer first tests
• Installs as a Claude Code plugin with a guided /connect-apps:setup flow

Pros

• Turns outreach skills from text generators into agents that work in your actual stack
• OAuth lifecycle management removes credential friction across many apps
• Observability and dry-run mode make agentic actions safer to test
• Broadest integration coverage among execution layers

Cons

• Requires understanding of credential scoping to use safely
• Not all API integrations have equal maturity
• Setup time for authentication flows adds friction, and pricing isn't published upfront

Visit Composio (connect-apps plugin)

#10 Hunter.io MCP Server

Hunter.io is not a full cold email skill — it's an email-finding and verification layer you add once Claude already has a target company or person in mind. Hunter published an official MCP server that Claude can call to find professional email addresses and verify deliverability for emails Claude already has, which is a narrower job than account discovery but a critical one: a perfectly written sequence to a bouncing address is worth nothing. In an outreach skill stack, Hunter slots in at the contact-data step — after your ICP and list-building skills identify target accounts, Hunter verifies the addresses before your copywriting skill drafts a single line. Its focused scope is both its strength and its limitation: it does one verification job well, rather than trying to cover discovery, enrichment, copy, and operations like the broader platforms on this list. For teams that already have prospect lists and just need reliable email finding and verification inside Claude, it's a dependable, purpose-built option.

Best for: Teams with existing target lists that need reliable email finding and verification inside Claude before drafting outreach

Pricing: Contact for pricing (see hunter.io for current plans)

Key features

• Official MCP server for Claude
• Professional email address finding for known companies and people
• Email deliverability verification for addresses you already have
• Purpose-built, narrow scope focused on the contact-data step of outreach

Pros

• Does one job — email finding and verification — very well
• Official MCP server means a straightforward, documented Claude integration
• Narrow scope keeps the context and setup footprint small

Cons

• Not a full cold email skill — no copywriting, sequencing, or campaign operations
• Narrower than data platforms like Vibe Prospecting for account discovery
• Pricing not confirmed in our research — check their site for current plans

Visit Hunter.io MCP Server

Conclusion

The right Claude Code skills can genuinely transform email and outreach work in 2026 — from copywriting quality (Corey Haines), to full campaign operations (GrowthEngineX), to deliverability guardrails (Borghei), to live prospect data (Vibe Prospecting, Hunter.io) and real-stack execution (Composio). But every one of these skills shares the same blind spot: almost none of them have been independently security-scanned or benchmarked to prove they actually improve output, and published research found roughly 26% of agent skills carry at least one vulnerability. Before you install outreach skills that touch your CRM, your email accounts, and your sending domains, it's worth verifying what you're putting into your agent. SkillzBench is building exactly that: a free, independent directory that pins every skill version to a commit SHA, security-scans and license-checks it, benchmarks it in a sandbox to publish the measured Lift, and connects your chosen skills to any agent through one free MCP server — with per-agent loadouts so your outreach agent only sees what you've selected. Everything is free, and scores are never influenced by money. SkillzBench is in pre-launch right now, so join the free waitlist at skillzbench.com to get early access to the directory, benchmarks, and MCP connector as they go live. Skills, proven.

Frequently asked questions

What makes SkillzBench different from just browsing skills on GitHub?

GitHub shows you stars and READMEs, but neither tells you whether a skill is secure or whether it actually improves output. SkillzBench is building an independent layer on top of the ecosystem: every skill version is pinned to a commit SHA, validated, license-checked, security-scanned, and quality-judged, then benchmarked in a sandbox with the same model — with and without the skill — to publish the Lift in percentage points. You also get a Trust score from 0 to 100, a free MCP server to equip skills across agents, and change tracking that re-scans and re-benchmarks when upstream skills update. It's all free, and money never touches scores.

Are Claude Code skills safe to use for email and outreach?

Mostly, but not always. Published research found approximately 26% of agent skills carry at least one vulnerability, and outreach skills are especially sensitive because they touch email accounts, CRMs, and sending domains. Best practices from experienced reviewers include reading the full SKILL.md, auditing every bundled script for undocumented network calls, and preferring official repos like anthropics/skills and partner skills from Vercel, Trail of Bits, and others. For an independent check, SkillzBench security-scans skills and publishes Trust scores so you can see risk signals before installing.

Do I need to know how to code to use Claude Code skills for outreach?

Basic terminal comfort helps, but you don't need to be an expert programmer. Most skills install with a single command, either via npx skills add or through Claude's plugin marketplace, and skills that draft copy (like Corey Haines' cold email skill) work much like prompting. The heavier operational packs, like GrowthEngineX's coldoutboundskills, assume more Claude Code proficiency and require your own API keys for tools like Smartlead and Prospeo. Start with one or two copywriting skills before installing a full operations stack.

How much do these skills cost?

Most of the skill collections on this list — Corey Haines' marketingskills, GrowthEngineX's coldoutboundskills, Borghei's collection, sales-skills/sales, Brian Wagner's repo, and ColdIQ's GTM Skills — are free and open source. The costs come from the underlying services: Claude Code itself requires a Claude Pro or Max plan, and data or execution layers like Vibe Prospecting, Composio, and Hunter.io have their own usage-based or plan-based pricing. SkillzBench is entirely free, including its directory, MCP connector, benchmarks, and alerts, funded by advertising that never influences scores.

Can one skill handle my whole cold email workflow?

Not realistically. The strongest stacks combine specialists: a data layer (Vibe Prospecting or Hunter.io) for verified contacts, a copywriting skill (Corey Haines) for the emails, a deliverability skill (Borghei's) for compliance guardrails, and an execution layer (Composio) to act inside your CRM and email tools. GrowthEngineX's 28-skill pack comes closest to covering everything in one install, but even there, the skills encode process — you still bring the judgment about your market and review sends before launch. SkillzBench's per-agent loadouts let you assemble exactly this kind of curated stack and toggle skills per agent.

Will AI-written cold emails get marked as spam?

Spam placement is mostly determined by infrastructure and volume discipline, not by who wrote the copy — though generic, robotic copy does hurt reply rates. The skills that address deliverability directly enforce hard thresholds: warming new domains 4 to 6 weeks, capping at 100 emails per day per address, keeping bounce rates under 2 percent, and staying below the 0.10% spam complaint line that Gmail and Yahoo enforce. Borghei's cold-email skill and GrowthEngineX's email-deliverability-audit encode these rules. Pair them with a copywriting skill and keep sends short — the Instantly 2026 benchmark data suggests keeping first-touch emails under 80 words.

Is SkillzBench available now?

SkillzBench is currently in pre-launch and actively being built — the waitlist and newsletter are live, but the public product is not yet released. That means you can't browse live benchmark results or skill counts today, but joining the waitlist at skillzbench.com gets you early access to the free directory, security scans, sandbox benchmarks, and the MCP connector as they roll out. Everything on the platform will be free when it launches, including alerts for upstream skill changes.