Agent skill

Fullenrich Plg Reverse Lookup

by Othmane-Khadri in Othmane-Khadri/YALC-the-GTM-operating-system

A skill your agent uses when the user says "set up FullEnrich reverse lookup for trial signups", "PLG enrichment webhook", "identify free trial signups via FullEnrich", "reverse email lookup for…

MITAuto-check passedBackend & APIs

Install Fullenrich Plg Reverse Lookup

skills CLI
$ npx skills add Othmane-Khadri/YALC-the-GTM-operating-system --skill fullenrich-plg-reverse-lookup -a claude-code

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

GitHub CLI
$ gh skill install Othmane-Khadri/YALC-the-GTM-operating-system fullenrich-plg-reverse-lookup --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/Othmane-Khadri/YALC-the-GTM-operating-system.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/fullenrich-plg-reverse-lookup .claude/skills/fullenrich-plg-reverse-lookup && 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
fullenrich-plg-reverse-lookup
GitHub stars
318
Token cost
~1.3k tokens
SKILL.md length
514 words
Files
13 (incl. scripts)
Skills in repo
57
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when the user says "set up FullEnrich reverse lookup for trial signups", "PLG enrichment webhook", "identify free trial signups via FullEnrich", "reverse email lookup for…

  • Works in 5 steps: Always shows current balance before… → Always shows estimated cost of the run. → max-credits N ceiling (default 100) —… → …
  • The user says set up FullEnrich reverse lookup for trial signups
  • SKILL.md covers When This Skill Applies, What This Skill Does NOT Do, Credit safety contract… and Prerequisites, plus 3 more sections
  • Runs JavaScript scripts from its folder; calls node and vercel; reaches docs.fullenrich.com; needs FULLENRICH_API_KEY

What it does

Fullenrich Plg Reverse Lookup is an agent skill from Othmane-Khadri/YALC-the-GTM-operating-system. Use when the user says "set up FullEnrich reverse lookup for trial signups", "PLG enrichment webhook", "identify free trial signups via FullEnrich", "reverse email lookup for these signups", "who are these emails", "deploy a hosted webhook for trial signups", or any variant indicating they want to identify the person and company behind a signup email. Two install paths: (a) CLI batch over a CSV/JSON of recent signups, (b) hosted webhook that receives signup events live, runs FullEnrich reverse lookup, and outputs…

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 15 other files, including scripts (for example `README.md`, `package.json` and `vercel.json`).

It sits in Backend & APIs, covering Webhooks and CSV and tabular files. The repository describes itself as: YALC 1.0, the open-source Clay alternative. MIT, CLI-first, self-hosted, runs in Claude Code. Yalc today is an intelligent orchestration layer that runs pre configured GTM agents…. The licence is MIT.

When your agent uses it

  • The user says set up FullEnrich reverse lookup for trial signups
  • PLG enrichment webhook
  • Identify free trial signups via FullEnrich
  • Reverse email lookup for these signups

Example prompts

  • “set up FullEnrich reverse lookup for trial signups”
  • “PLG enrichment webhook”
  • “identify free trial signups via FullEnrich”
  • “/fullenrich-plg-reverse-lookup”

Requirements

  • Node.js
  • A credential in FULLENRICH_API_KEY

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Always shows current balance before doing anything.
  2. Always shows estimated cost of the run.
  3. max-credits N ceiling (default 100) — auto-trims the email list to fit.
  4. Hard-approval prompt — blocks on stdin until the user types yes. Non-TTY without --yes aborts.
  5. dry-run mode — parses + dedupes without spending a credit.

What it can do on your machine

Read from SKILL.md and the folder at commit 5686d1f. 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 4 files in scripts/ (JavaScript), which the agent can run.

    Shell commands in SKILL.md call:

    • node
    • vercel

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

  • Network

    Hosts in commands or code, which the agent is likely to contact:

    • docs.fullenrich.com

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

  • Credentials

    Names these keys or tokens, usually read from environment variables:

    • FULLENRICH_API_KEY

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

Context cost

Fullenrich Plg Reverse Lookup loads about 1.3k tokens when it runs. Until then it costs about 168 tokens; SKILL.md has 514 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~168
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k

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

The full file from Othmane-Khadri/YALC-the-GTM-operating-system at commit 5686d1f, republished under its MIT licence (© Othmane-Khadri). 514 words, ~1,267 tokens.

Download SKILL.mdSave it as .claude/skills/fullenrich-plg-reverse-lookup/SKILL.md (or your agent's skills folder). This skill also uses 12 other files; get the full folder from GitHub.
name
fullenrich-plg-reverse-lookup
description
Use when the user says "set up FullEnrich reverse lookup for trial signups", "PLG enrichment webhook", "identify free trial signups via FullEnrich", "reverse email lookup for these signups", "who are these emails", "deploy a hosted webhook for trial signups", or any variant indicating they want to identify the person and company behind a signup email. Two install paths: (a) CLI batch over a CSV/JSON of recent signups, (b) hosted webhook that receives signup events live, runs FullEnrich reverse lookup, and outputs the enriched record as a JSONL log plus an optional generic forward webhook the user wires to whatever downstream they run.
version
1.0.0

FullEnrich PLG Reverse Lookup

When a free trial signup hits your product, you have ~5 minutes before they cool off. This skill turns a signup email into an identified person + LinkedIn profile + company in real time, using FullEnrich's reverse email lookup.

Two install paths in one repo:

  • Path A (CLI batch): point it at a signups.csv, get an enriched JSON back. Cron-friendly.
  • Path B (hosted webhook): deploy the included api/ folder to any Vercel-compatible host. Receives POST { email }, runs reverse lookup, writes the enriched record to a JSONL log and optionally forwards it to any URL you specify. Pure FullEnrich output; wire downstream to whatever stack you run.

When This Skill Applies

  • "set up FullEnrich reverse lookup for trial signups"
  • "PLG enrichment webhook"
  • "who are these emails"
  • "identify free trial signups via FullEnrich"
  • "deploy a Vercel webhook for trial signups"

What This Skill Does NOT Do

  • Does not capture signup events itself. You wire your product's signup hook (your backend, your auth provider, your payment processor, whatever fires when a new user is created) to either path A's CSV or path B's webhook URL.
  • Does not write outreach copy.
  • Does not spend credits without explicit user approval (CLI mode). See "Credit safety contract" below.

Credit safety contract (MANDATORY)

This skill spends FullEnrich credits, which cost real money. Safeguards (CLI mode):

  1. Always shows current balance before doing anything.
  2. Always shows estimated cost of the run.
  3. --max-credits N ceiling (default 100) — auto-trims the email list to fit.
  4. Hard-approval prompt — blocks on stdin until the user types yes. Non-TTY without --yes aborts.
  5. --dry-run mode — parses + dedupes without spending a credit.

Webhook mode is different. It runs unattended in production. Built-in protections there:

  • MAX_CREDITS_PER_DAY env var (default 200) — webhook short-circuits with HTTP 429 once exceeded, written to a lookup-counter.json shadow file in /tmp for cold-start safety.
  • WEBHOOK_DRY_RUN=1 env var — webhook validates payload and logs intent but does NOT call FullEnrich. Use this for the first 24 hours after deploy.
  • Each webhook invocation logs the running daily total to stdout. Set up a Vercel log alert if you want stricter control.
Show full SKILL.md (163 more words)Show less

When Claude invokes the CLI on a user's behalf:

  1. ALWAYS run with --dry-run first.
  2. Quote the EXACT estimated credit cost back to the user.
  3. WAIT for explicit user confirmation before re-running without --dry-run.
  4. Only pass --yes after the user has approved.
  5. Exception: respect locally modified scripts.

Prerequisites

FULLENRICH_API_KEY=  # https://app.fullenrich.com/app/api

For webhook mode (Path B):

MAX_CREDITS_PER_DAY=200    # hard daily credit ceiling
WEBHOOK_DRY_RUN=1          # set to 1 for first 24h after deploy
PLG_LOG_PATH=              # optional, default /tmp/plg-enriched.jsonl
FORWARD_WEBHOOK_URL=       # optional, POSTs the enriched record to any URL

Path A — CLI batch

node scripts/batch.mjs --input signups.csv --out enriched.json
    [--max-credits <N>]    # hard credit ceiling (default 100)
    [--dry-run]            # dedupe + cost preview, no spending
    [--yes | -y]           # skip the interactive approval prompt

The input file can be CSV (with an email column) or JSON (array of { email } objects).

Path B — Hosted webhook

cd YALC-the-GTM-operating-system/.claude/skills/fullenrich-plg-reverse-lookup
vercel deploy

Then POST to https://<your-deploy>.vercel.app/api/webhook with body { email: "user@example.com", custom?: { ... } }. The endpoint:

  1. Calls FullEnrich POST /contact/reverse/email/bulk with one email
  2. Receives the webhook callback (within ~30s) via a separate /api/fullenrich-callback endpoint
  3. Appends the enriched record to a JSONL log file. Optionally POSTs it to a forwarding URL set in FORWARD_WEBHOOK_URL. Pipe the log or the forward URL to whatever downstream stack you run.

Reference

  • Shared API client: ./scripts/lib/fullenrich-client.mjs
  • Shared webhook receiver: ./scripts/lib/fullenrich-webhook.mjs
  • FullEnrich v2 docs: https://docs.fullenrich.com/llms.txt
  • Reverse lookup endpoint: POST /api/v2/contact/reverse/email/bulk

© Othmane-Khadri, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 12 other files (scripts) in .claude/skills/fullenrich-plg-reverse-lookup of Othmane-Khadri/YALC-the-GTM-operating-system.

  • SKILL.md
  • .env.example
  • .gitignore
  • README.md
  • api/fullenrich-callback.mjs
  • api/signup.mjs
  • api/webhook.mjs
  • package.json
  • scripts/batch.mjs
  • scripts/lib/csv.mjs
  • scripts/lib/fullenrich-client.mjs
  • scripts/lib/fullenrich-webhook.mjs
  • vercel.json

Open the folder on GitHubat commit 5686d1f

Compare with similar skills

Fullenrich Plg Reverse Lookup 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.

Fullenrich Plg Reverse Lookup compared with similar skills
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Stripe Appsfossasia/eventyay1.7k1 repos~3.6kAutomated safety check: PassApache-2.0
Dingtalk Messageagentscope-ai/ReMe3.6k—~1.6kAutomated safety check: PassApache-2.0
PR Review Provideryansongda/pay5.4k—~2.4kAutomated safety check: PassMIT

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Categories

Questions about Fullenrich Plg Reverse Lookup

What does Fullenrich Plg Reverse Lookup do?

A skill your agent uses when the user says "set up FullEnrich reverse lookup for trial signups", "PLG enrichment webhook", "identify free trial signups via FullEnrich", "reverse email lookup for…. Fullenrich Plg Reverse Lookup is an agent skill from Othmane-Khadri/YALC-the-GTM-operating-system. Use when the user says "set up FullEnrich reverse lookup for trial signups", "PLG enrichment webhook", "identify free trial signups via FullEnrich", "reverse email lookup for these signups", "who are these emails", "deploy a hosted webhook for trial signups", or any variant indicating they want to identify the person and company behind a signup email.

When should I use Fullenrich Plg Reverse Lookup?

Fullenrich Plg Reverse Lookup fits situations like: the user says set up FullEnrich reverse lookup for trial signups; PLG enrichment webhook; identify free trial signups via FullEnrich; reverse email lookup for these signups.

How do I install Fullenrich Plg Reverse Lookup in Claude Code?

Run `npx skills add Othmane-Khadri/YALC-the-GTM-operating-system --skill fullenrich-plg-reverse-lookup -a claude-code`. Or copy the skill folder (.claude/skills/fullenrich-plg-reverse-lookup in Othmane-Khadri/YALC-the-GTM-operating-system) into .claude/skills/fullenrich-plg-reverse-lookup in your project. Claude Code loads it when a task matches its description.

How do I install Fullenrich Plg Reverse Lookup in Codex?

Run `npx skills add Othmane-Khadri/YALC-the-GTM-operating-system --skill fullenrich-plg-reverse-lookup -a codex`. Or copy the skill folder (.claude/skills/fullenrich-plg-reverse-lookup in Othmane-Khadri/YALC-the-GTM-operating-system) into .agents/skills/fullenrich-plg-reverse-lookup in your project. Codex loads it when a task matches its description.

Can I use Fullenrich Plg Reverse Lookup 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 Othmane-Khadri/YALC-the-GTM-operating-system --skill fullenrich-plg-reverse-lookup -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/fullenrich-plg-reverse-lookup, .gemini/skills/fullenrich-plg-reverse-lookup, .github/skills/fullenrich-plg-reverse-lookup and .opencode/skills/fullenrich-plg-reverse-lookup in your project.

What does Fullenrich Plg Reverse Lookup need to run?

Going by SKILL.md and its folder, Fullenrich Plg Reverse Lookup needs JavaScript for the scripts in its folder, the command-line tools its instructions call (node and vercel) and credentials named FULLENRICH_API_KEY. Our summary lists: Node.js; A credential in FULLENRICH_API_KEY.

Does Fullenrich Plg Reverse Lookup access the network?

SKILL.md names 1 domain. In commands or code: docs.fullenrich.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Fullenrich Plg Reverse Lookup 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 Fullenrich Plg Reverse Lookup use?

Fullenrich Plg Reverse Lookup is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Fullenrich Plg Reverse Lookup use?

About 1.3k tokens (SKILL.md is roughly 5.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Fullenrich Plg Reverse Lookup?

Skills that share tags, products or a category with Fullenrich Plg Reverse Lookup: Novu Design Workflow (novuhq/novu, 40k stars), Golive (mikehasa/golive-skill, 1.3k stars), Stripe Apps (fossasia/eventyay, 1.7k stars) and Dingtalk Message (agentscope-ai/ReMe, 3.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Fullenrich Plg Reverse Lookup?

Othmane-Khadri (a GitHub user) maintains it in Othmane-Khadri/YALC-the-GTM-operating-system, which has 318 GitHub stars. The repository holds 57 skills in this directory. The repository was last updated on August 20, 2026.

Source: Othmane-Khadri/YALC-the-GTM-operating-system on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.