Welcome to the new site. If you have any issues purchasing or accessing models, use [store.hemrock.com](https://store.hemrock.com/).

# 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](https://github.com/tdavidson/skill-hemrock)

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](https://www.hemrock.com/skill/hemrock.zip)  
Copy / paste›

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

[SKILL.md](https://www.hemrock.com/skill/hemrock/SKILL.md)

[Or use the MCP server](https://www.hemrock.com/mcp)

## What is a skill?

A [Claude Agent Skill](https://docs.claude.com/en/docs/agents-and-tools/agent-skills/overview) 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](https://www.hemrock.com/mcp) instead – it exposes the same content to ChatGPT, Cursor, 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.

1. Standard Financial Model `standard`
2. Cap Table & Exit Waterfall Tool `cap_table`
3. Venture Capital Model (flagship) `venture_fund`
4. Venture Capital Model – Quarterly Forecast `venture_fund_quarterly`
5. Fund Economics Tool `fund_economics`
6. Venture Valuation Tool `venture_valuation`
7. SaaS Forecasting Tool `saas`
8. Ecommerce Forecasting Tool `ecommerce`
9. Unit Economics Tool `unit_economics`
10. Runway & Cash Budget `runway`

## How to install

1. **Step 1 – clone from GitHub**  
Canonical source is [github.com/tdavidson/skill-hemrock](https://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](https://www.hemrock.com/skill/hemrock.zip) if you don't use git.

2. **Step 2 – add to a Claude Project**  
In [Claude.ai Projects](https://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 →](https://www.hemrock.com/mcp)

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.