plunk

plunk is a skill for Claude Code from felipefontoura/bento. It costs 135 tokens per session (1,318 once invoked), scanned A, original, MIT.

A set of instructions for operating Plunk, an email platform, through its web API on a Bento-hosted server. It covers email delivery, event tracking, and contact lists.

In plain words
What is it for?
Use it to send transactional emails, track events, start email automations, and create, update, list, subscribe, or unsubscribe contacts.
Why use it?
It keeps email and contact changes going through Plunk's supported API instead of directly changing its database, which can leave the service out of sync.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the bento plugin — 13 skills shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/felipefontoura/bento/plunk
Any agent
npx skills add felipefontoura/bento --skill plunk
Clone the repo
git clone --depth 1 https://github.com/felipefontoura/bento

Made for: Claude Code.

Or install bento, the plugin that ships this one along with the rest of its 13 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for plunk

README.md
[![agentmods](https://agentmods.dev/badge/skills/felipefontoura/bento/plunk.svg)](https://agentmods.dev/skills/felipefontoura/bento/plunk)
Your own site
<a href="https://agentmods.dev/skills/felipefontoura/bento/plunk"><img src="https://agentmods.dev/badge/skills/felipefontoura/bento/plunk.svg" alt="Measured on agentmods" height="20"></a>
Per session 135 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,318 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00135 $0.01318
Opus 5 $0.00068 $0.00659
Sonnet 5 $0.00027 $0.00264
Haiku 4.5 $0.00014 $0.00132

Measured 6d ago against content hash 03c98d2a42bf, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

plunk scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -s -X POST "https://$PLUNK_HOST/v1/send" \
plugins/bento/skills/plunk/SKILL.md · 108 lines

How it starts

The opening of the file, as written. The whole thing — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You operate the HTTP API of a Plunk stack that is already deployed by bento. This is day-2 work: send transactional emails, track events, manage contacts. This skill carries the bento-specific wiring and operational traps — for exact endpoint paths and request bodies, go to the official docs (linked at the bottom); they are the source of truth and move faster than this file.

Golden rule — use the HTTP API, never the DB. All contact, event, and email operations must go through the REST endpoints. Read-only DB inspection to understand state is always fine.

When to invoke

  • "send a transactional email" / "send an email to a user"
  • "track an event" / "trigger an email automation"
  • "add / create / update / delete / list a contact"
  • "subscribe or unsubscribe a contact"

For getting Plunk running use /bento:deploy. For AWS SES credentials use /bento:auth or set them directly in the stack envs.

Discover the instance — don't hardcode

ssh "$user@$host" "jq -r '.envs.plunk.PLUNK_HOST' \$HOME/.config/bento/state.json"

Base URL: https://<PLUNK_HOST>. Traefik routes directly to the container's port 3000 — there is no nginx layer. Container name convention in the Swarm:

plunk_container() { ssh "$user@$host" "docker ps --filter name=plunk_plunk -q | head -1"; }

For loopback calls (inside the container): http://127.0.0.1:3000. From outside: always use https://<PLUNK_HOST>.

Auth — two key types, both Bearer

Authorization: Bearer <key> on every authenticated call. Keys are minted in the Plunk dashboard → Project → API Keys; there is no DB bootstrap path.

Key type Prefix Scope
Secret key sk_... Server-side: send, contacts CRUD, event tracking (/events/track)
Public key pk_... Client-side only: POST /v1/track (browser/app tracking)

Never echo either key. Store in env vars and reference by name.

Operation groups

Four groups — look up exact paths and bodies in the docs:

Read the full file on GitHub · 108 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 6d ago First seen · 108 lines · 0 tokens per session scan A 03c98d2a42bf

Subscribe to this mod's changes

plunk is a skill published in the GitHub repository felipefontoura/bento (20 stars, last pushed 1mo ago), licensed MIT. It adds 135 tokens to every session and 1,318 once invoked, about $0.0007 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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