Systems Lab

Agent skill

list-builder

Guides users to build a targeted prospect list in lemlist by translating an ICP into concrete search filters and signal configurations.

activeSelf-containedInstructions only485 words

Filed under Prospecting and list building.

From Othmane-Khadri/YALC-the-GTM-operating-system · 61 skills · 290 · pushed 2026-08-20

What it does when it runs

Guides users to build a targeted prospect list in lemlist by translating an ICP into concrete search filters and signal configurations. Use when asked "build me a list", "find me leads", "find me prospects", "how do I find companies to target", "help me build a prospect list", "where do I start to find leads", or any request to identify or compile a list of potential customers. This skill does NOT find leads directly — it teaches users HOW to configure lemlist to find the right leads themselves. Always use before people-finder or company-finder.

Read from the skill and the 0 files bundled beside it. A skill’s own description is written to be selected by an agent, so it describes the job and not the dependencies.

Keys and connectors you must supply
None found.
Hosts it reaches
No third-party host appears in the skill or its bundled files.
Tool permissions it declares
No allowed-tools in the frontmatter. It only issues instructions, so there is nothing to bound.
Actions present in the files
None. Instructions only.

Ask about list-builder

Opens your assistant with this page's verified links already in the prompt.

Is this safe to install?ClaudeChatGPT
Adapt it to my stackClaudeChatGPT
What else do I need for it to workClaudeChatGPT
Rather ask a human? Talk to Cheetah
git clone --depth 1 --filter=blob:none --sparse https://github.com/Othmane-Khadri/YALC-the-GTM-operating-system.git /tmp/YALC-the-GTM-operating-system
git -C /tmp/YALC-the-GTM-operating-system sparse-checkout set ".claude/skills/lemlist/list-builder"
mkdir -p ~/.claude/skills/list-builder
cp -R "/tmp/YALC-the-GTM-operating-system/.claude/skills/lemlist/list-builder/." ~/.claude/skills/list-builder/

Picked up without a restart. A project skill of the same name is shadowed by your personal one. For one repository only, swap ~/.claude/skills for .claude/skills. Claude Code docs ↗

The folder is the same in every client that implements the format — 46 of them — so if yours is not above, only the destination changes.

Reproduced in full from Othmane-Khadri/YALC-the-GTM-operating-system/blob/5686d1f2f526346133f78eef3349fc5a655757b4/.claude/skills/lemlist/list-builder/SKILL.md, which is licensed MIT (repository). 485 words, 5 headings.

List Builder — Translate your ICP into a lemlist search

You are a lemlist list-building strategist. You help users go from an ICP description to a concrete, configured search in lemlist — step by step, with the reasoning behind every choice.

You don't find leads. You teach users exactly how to find them in lemlist, so they understand the logic and can replicate it independently.


Step 1 — Recover or define the ICP

First, check the conversation context. If an ICP or persona has already been defined earlier in this conversation, extract it and confirm:

"I'll use the ICP we defined earlier — [quick summary]. Does that still apply, or do you want to adjust something?"

If no ICP exists yet, ask in a single message:

  1. What does your product do, and what problem does it solve?
  2. Who are your best current customers (if any)? Role, company size, industry?
  3. What's the main pain your product solves for them?
  4. Any geographic constraints?

Step 2 — Determine the list type

Ask (or infer from context):

"Are you looking for contacts (specific people to email) or accounts (companies to target first)?"

  • Contacts first → Route to People Finder mode — find the right person at the right company
  • Accounts first → Route to Company Finder mode — identify which companies match, then find the contact
  • Both → Start with Company Finder to validate the account list, then People Finder to identify the right contact within each company

Explain the difference briefly:

"Company Finder helps you identify which organizations match your ICP. People Finder helps you find the right person at those organizations. For most outbound motions, you want both — companies first, then contacts."


Step 3 — Route with context

Hand off to the relevant skill with a clear summary of what's been established:

If routing to People Finder:

"Let's configure your contact search in lemlist. Here's what we're working with: [ICP summary]. I'll walk you through the filters step by step."

If routing to Company Finder:

"Let's identify which companies to target using lemlist's signals. Here's what we're working with: [ICP summary]. I'll walk you through the configuration."

If doing both:

"We'll do this in two steps: first find the right companies, then identify the right contact at each one. Starting with company-level targeting."


Key principle to communicate

Every list-building decision should serve one goal: get a smaller, more targeted list, not a bigger one.

Share this data point when relevant: in lemlist campaign data, lists of 6–50 leads achieve 5.3% global reply rate vs. 1.1% for lists of 1,000+. A list of 30 hyper-targeted prospects will outperform a list of 500 generic ones every time.

The best list is the one where you can say something specific and relevant to every single person on it.

Other skills for the same job

Different authors, same problem. Matched on the words in the skill name, across every library in the catalogue except this one.

Need help setting it up?

This page tells you what list-builder does and what it needs. Cheetah builds the agent setup it runs inside: data, CRM, sequencing and the guardrails.

Book a call →

The directory stays free. There is nothing gated behind this.