# B4 Index

> Use this tool when you need to determine whether to build or buy software solutions for specific categories. The B4 Index provides a score-based index that categorizes software into BUILD, BUY, BRIDGE, or BEWARE, helping you make informed decisions and avoid potential pitfalls. It takes software categories as input and outputs a recommended approach, ideal for use in software development, procurement, and strategic planning contexts.

Canonical page: https://skillsregistry.net/skills/ai-benroberts-b4-index  
JSON: https://api.skillsregistry.net/v1/skills/ai-benroberts-b4-index

## Description

Independent build-vs-buy index: score software categories BUILD/BUY/BRIDGE/BEWARE.

## Trust

- **Trust score (0–1):** 0.70
- **Verification tier:** unverified

## Facts

- **Version:** 3.3.0
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** other
- **Updated:** 2026-07-03

## Source

- **Source listing:** [MCP Registry](https://registry.modelcontextprotocol.io/v0/servers/ai.benroberts%2Fb4-index)

## Use it

MCP endpoint published by the skill: `https://b4-index.vercel.app/mcp`

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "ai-benroberts-b4-index"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/ai-benroberts-b4-index` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/ai-benroberts-b4-index/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt