Official agent skill

Resend

by zapier in zapier/connectors

Agent-callable Resend tools — send transactional email, manage contacts and segments, send broadcasts, read delivery status, and diagnose sending domains.

OfficialElastic-2.0Auto-check passedBackend & APIs

Install Resend

skills CLI
$ npx skills add zapier/connectors --skill resend -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install zapier/connectors resend --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/zapier/connectors.git skills-src && mkdir -p .claude/skills && cp -r skills-src/apps/resend .claude/skills/resend && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
resend
GitHub stars
176
Token cost
~4.2k tokens
SKILL.md length
1,498 words
Files
67 (incl. scripts, references)
Skills in repo
29
Repo updated
First seen
Licence
Elastic-2.0

At a glance

Agent-callable Resend tools — send transactional email, manage contacts and segments, send broadcasts, read delivery status, and diagnose sending domains.

  • The user mentions Resend
  • SKILL.md covers When to use this, Setup, Scripts and Disambiguation & refusals, plus 3 more sections
  • Runs TypeScript and JavaScript scripts from its folder; calls npm, npx and git
  • Wants to send email

What it does

Resend is an agent skill from zapier/connectors, published by the product's own GitHub organization. Agent-callable Resend tools — send transactional email, manage contacts and segments, send broadcasts, read delivery status, and diagnose sending domains. Use when the user mentions Resend or wants to send email, manage a contact list, or check email delivery, even if they don't name Resend explicitly.

Its SKILL.md is about 4.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 70 other files, including scripts and reference files (for example `.claude-plugin/plugin.json`, `.mcp.json` and `CHANGELOG.md`). Compatibility notes: Run npm install --omit=dev in this directory, then node cli.js. The TypeScript source needs Node.js 22.18+; on older Node, run cli.js for build-it-yourself /…

It sits in Backend & APIs, covering Transactional email. It works with Zapier. The repository describes itself as: Connect your agent to the apps you already use - with or without Zapier.

When your agent uses it

  • The user mentions Resend
  • Wants to send email
  • Manage a contact list
  • Check email delivery

Example prompts

  • “/resend”

Requirements

  • Node.js
  • Compatibility (from SKILL.md): Run `npm install --omit=dev` in this directory, then `node cli.js`. The TypeScript source needs Node.js 22.18+; on older Node, run `cli.js` for build-it-yourself / prebuilt / alternative-runtime options.

What it can do on your machine

Read from SKILL.md and the folder at commit e48d26f. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 1 file in scripts/ (TypeScript and JavaScript, from the files we listed), which the agent can run.

    Shell commands in SKILL.md call:

    • npm
    • npx
    • git

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • resend.com
    • agentskills.io

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    Run `npm install --omit=dev` in this directory, then `node cli.js`. The TypeScript source needs Node.js 22.18+; on older Node, run `cli.js` for build-it-yourself / prebuilt / alternative-runtime options.

    From compatibility in the SKILL.md frontmatter.

Context cost

Resend loads about 4.2k tokens when it runs, and up to ~12k if it reads all its reference files. Until then it costs about 78 tokens; SKILL.md has 1,498 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~78
When it runs · the whole SKILL.md, loaded when a task matches
~4.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~12k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

Its licence (Elastic-2.0) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,498 words (~4,248 tokens).

“Agent-callable tools for Resend, the email API. Send transactional email to one or more recipients, manage a contact list (create, look up, update, delete contacts and their custom properties), organize contacts into segments and manage segment membership, send a broadcast…”

— opening of SKILL.md by zapier, Elastic-2.0
name
resend
compatibility
Run `npm install --omit=dev` in this directory, then `node cli.js`. The TypeScript source needs Node.js 22.18+; on older Node, run `cli.js` for build-it-yourself / prebuilt / alternative-runtime options.
license
Elastic-2.0
metadata.source
https://github.com/zapier/connectors/blob/main/apps/resend/SKILL.md
metadata.title
Resend
metadata.api-docs
https://resend.com/docs/api-reference/introduction
metadata.zapier-app-key
App178572CLIAPI

Read the full SKILL.md on GitHub

Files

SKILL.md and 66 other files (scripts, references) in apps/resend of zapier/connectors.

  • SKILL.md
  • .claude-plugin/plugin.json
  • .mcp.json
  • CHANGELOG.md
  • LICENSE
  • NOTICE
  • README.md
  • cli.js
  • cli.ts
  • connections.ts
  • evals/evals.json
  • evals/results.md
  • index.ts
  • lib/resendFetch.ts
  • package.json
  • references/resend-api-gotchas.md
  • references/use-as-cli.md
  • … and 50 more

Open the folder on GitHubat commit e48d26f

Compare with similar skills

Resend next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Resend compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Resend this skillzapier/connectors176—~4.2kAutomated safety check: PassElastic-2.0
Stripe Projectsfossasia/eventyay1.7k5 repos~2kAutomated safety check: NotesApache-2.0
WooCommerce Email Editor Developmentwoocommerce/woocommerce11k—~893Automated safety check: PassCustom licence
Himalaya Email CLIPrismer-AI/PrismerCloud1.6k3 repos~2.3kAutomated safety check: PassMIT
Email Best Practicesviclafouch/meme-studio1107 repos~787Automated safety check: PassNone
React Emailviclafouch/meme-studio1102 repos~3.6kAutomated safety check: PassMIT

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Works with

Categories

Questions about Resend

What does Resend do?

Agent-callable Resend tools — send transactional email, manage contacts and segments, send broadcasts, read delivery status, and diagnose sending domains. Resend is an agent skill from zapier/connectors, published by the product's own GitHub organization. Agent-callable Resend tools — send transactional email, manage contacts and segments, send broadcasts, read delivery status, and diagnose sending domains.

When should I use Resend?

Resend fits situations like: the user mentions Resend; wants to send email; manage a contact list; check email delivery.

How do I install Resend in Claude Code?

Run `npx skills add zapier/connectors --skill resend -a claude-code`. Or copy the skill folder (apps/resend in zapier/connectors) into .claude/skills/resend in your project. Claude Code loads it when a task matches its description.

How do I install Resend in Codex?

Run `npx skills add zapier/connectors --skill resend -a codex`. Or copy the skill folder (apps/resend in zapier/connectors) into .agents/skills/resend in your project. Codex loads it when a task matches its description.

Can I use Resend in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add zapier/connectors --skill resend -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/resend, .gemini/skills/resend, .github/skills/resend and .opencode/skills/resend in your project.

What does Resend need to run?

Going by SKILL.md and its folder, Resend needs TypeScript and JavaScript for the scripts in its folder and the command-line tools its instructions call (npm, npx and git). Our summary lists: Node.js. Compatibility (from SKILL.md): Run `npm install --omit=dev` in this directory, then `node cli.js`. The TypeScript source needs Node.js 22.18+; on older Node, run `cli.js` for build-it-yourself / prebuilt / alternative-runtime options..

Does Resend access the network?

SKILL.md names 2 domains. As links in the text: resend.com and agentskills.io. This is read from the text; nothing was executed.

Is Resend safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Resend use?

Resend is published under the Elastic-2.0 licence (declared in SKILL.md).

How many tokens does Resend use?

About 4.2k tokens (SKILL.md is roughly 17k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 7.6k tokens, read only when the agent opens those files.

What are the alternatives to Resend?

Skills that share tags, products or a category with Resend: Stripe Projects (fossasia/eventyay, 1.7k stars), WooCommerce Email Editor Development (woocommerce/woocommerce, 11k stars), Himalaya Email CLI (Prismer-AI/PrismerCloud, 1.6k stars) and Email Best Practices (viclafouch/meme-studio, 110 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Resend?

zapier (a GitHub organization, an official publisher) maintains it in zapier/connectors, which has 176 GitHub stars. The repository holds 29 skills in this directory. The repository was last updated on August 25, 2026.

Source: zapier/connectors on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.