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Skill

A drop-in Claude Agent Skill that gives any Claude Project Hemrock's universal modeling primer, per-template sheet maps, task-specific prompts, and sanity checks. Same content as the MCP server, packaged as a file – no connector to maintain.

Free
Open, no auth, no limits
View on GitHub

Clone or download, then add to a Claude Project

Clone command›
git clone https://github.com/tdavidson/skill-hemrock.git
Download zip›

For users without git. Unzip, then add the folder to a Claude Project.

hemrock.zip
Copy / paste›

Read the primer and paste it into any AI chat – no install needed.

SKILL.md
Or use the MCP server

What is a skill?

A Claude Agent Skill is a packaged bundle of instructions, prompts, and reference files that Claude loads into context when you add it to a Project. The entry-point is a SKILL.md file – Claude reads it first, then routes to whichever companion files it needs based on what you ask.

Skills are a Claude-specific format (works in Claude.ai Projects, Claude Desktop, and the Agent SDK). For non-Claude tools, use the MCP server instead – it exposes the same content to ChatGPT, Cursor, Goose, and any other MCP-speaking client.

What's in it

SKILL.md

The entry-point file Claude reads when the skill is loaded. Contains the universal modeling primer and instructions for routing to the right template file.

templates/

One file per model with the full sheet map (inputs, formulas, outputs, cell references) and template-specific conventions.

prompts/

Task-specific prompts per model: orientation, revenue, expenses, fundraising, analysis, presentation.

checks/

Sanity-check prompts per model + universal checks. Catches hallucinated formulas, hard-coded values, confused metrics, broken references.

best_practices/

Cross-template guidance by topic: formatting, structure, inputs, assumptions, review, sharing.

Models covered

The skill bundles primers and prompts for every current Hemrock model.

Standard Financial Modelstandard
Cap Table & Exit Waterfall Toolcap_table
Venture Capital Model (flagship)venture_fund
Venture Capital Model – Quarterly Forecastventure_fund_quarterly
Fund Economics Toolfund_economics
Venture Valuation Toolventure_valuation
SaaS Forecasting Toolsaas
Ecommerce Forecasting Toolecommerce
Unit Economics Toolunit_economics
Runway & Cash Budgetrunway

How to install

  1. Step 1 – clone from GitHub

    Canonical source is github.com/tdavidson/skill-hemrock.

    git clone https://github.com/tdavidson/skill-hemrock.git ~/claude-skills/hemrock

    Updates later with git pull. Or download hemrock.zip if you don't use git.

  2. Step 2 – add to a Claude Project

    In Claude.ai Projects, create or open a project and add the cloned folder's files to the project's knowledge. Claude reads SKILL.md first and routes to the other files as needed.

  3. Step 3 – use

    Tell Claude which Hemrock model you're editing (e.g. “I'm working on the cap_table template”) and it loads the matching primer automatically.

Skill vs MCP

Both surfaces the same content. Pick by preference:

Skill

Drop-in files. Works in Claude Projects, Claude Desktop, and clients using the Claude Agent SDK. Claude-only format – other clients don't natively load Agent Skills.

MCP

Live connector at mcp.hemrock.com. Works in Claude Desktop, Claude.ai, ChatGPT, Cursor, Goose, and any other MCP-speaking client. Requires you add the connector once.

Using ChatGPT or another non-Claude client? Use MCP – Skills are Claude-specific, but MCP works across every major AI tool. See the MCP page →

You can use both together. The SKILL.md tells Claude to prefer MCP tool calls if available, and to fall back to the bundled files if not.

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