# 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.

- Standard Financial Model `standard`  
- Cap Table & Exit Waterfall Tool `cap_table`  
- Venture Capital Model (flagship) `venture_fund`  
- Venture Capital Model – Quarterly Forecast `venture_fund_quarterly`  
- Fund Economics Tool `fund_economics`  
- Venture Valuation Tool `venture_valuation`  
- SaaS Forecasting Tool `saas`  
- Ecommerce Forecasting Tool `ecommerce`  
- Unit Economics Tool `unit_economics`  
- 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.