B4 Index is an MCP server with 5 tools an agent can call, among them b4_audit, b4_browse, b4_compare. It answers at https://b4-index.vercel.app/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 10 of 10 times since 4 September 2026; the last check, on 17 October 2026, succeeded.
Independent build-vs-buy index: score software categories BUILD/BUY/BRIDGE/BEWARE.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
b4_audit | Analyze a software stack against the B4 Index. Provide a list of tool/category names, and get per-tool banded verdicts plus a portfolio verdict distribution. Each entry carries the full category payload, so BEWARE entries show where spend i Inputs: org, tools |
b4_browse | Search and filter the B4 Index's 1,600+ independently scored software categories. Browse by keyword, domain, quadrant, or industry. When filtering by industry, returns all vertical categories for that industry PLUS all horizontal categories Inputs: org, query, domain, quadrant, industry, limit |
b4_compare | Compare build vs buy for a specific software category. Returns side-by-side analysis with the category's banded verdict, scores, vendor options, AI replacement approach, and action steps for each path. Structured output carries the full pic Inputs: org, category |
b4_recommend | Get B4 Index recommendations from a natural language description of a software need or business context. Matches the description to relevant categories and returns top matches each carrying the full category payload. Structured output carri Inputs: org, description |
b4_score | Score a software category using the B4 Index. Provide a known category name to get pre-computed scores, or provide raw dimension scores (1-5 each) for a custom evaluation. Structured output carries the full picture: the banded verdict, the Inputs: org, category, includeEvidence, scores |
Every block below points at https://b4-index.vercel.app/mcp. Pick your client and copy.
claude mcp add --transport http b4-index https://b4-index.vercel.app/mcp
{
"mcpServers": {
"b4-index": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://b4-index.vercel.app/mcp"]
}
}
}{
"mcpServers": {
"b4-index": {
"url": "https://b4-index.vercel.app/mcp"
}
}
}{
"servers": {
"b4-index": {
"type": "http",
"url": "https://b4-index.vercel.app/mcp"
}
}
}{
"context_servers": {
"b4-index": {
"url": "https://b4-index.vercel.app/mcp"
}
}
}{
"mcpServers": {
"b4-index": {
"serverUrl": "https://b4-index.vercel.app/mcp"
}
}
}{
"mcpServers": {
"b4-index": {
"url": "https://b4-index.vercel.app/mcp"
}
}
}name: B4 Index
version: 0.0.1
schema: v1
mcpServers:
- name: B4 Index
type: streamable-http
url: https://b4-index.vercel.app/mcp{
"mcpServers": {
"b4-index": {
"httpUrl": "https://b4-index.vercel.app/mcp"
}
}
}{
"mcpServers": {
"b4-index": {
"type": "http",
"url": "https://b4-index.vercel.app/mcp"
}
}
}{
"mcpServers": {
"b4-index": {
"url": "https://b4-index.vercel.app/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fb4-index.vercel.app%2Fmcp&type=streamable_http&id=b4-index&name=B4%20Index
It answered our last check on 17 October 2026 in 219 ms. Over 10 checks since 4 September 2026 it answered 10. Status here comes from Neuronto's own probes, not from the publisher.
5, as returned by the server's own tools/list on 7 September 2026: b4_audit, b4_browse, b4_compare, b4_recommend, b4_score.
It answered our last check on 17 October 2026 in 219 ms. Over 10 checks since 4 September 2026 it answered 10.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://b4-index.vercel.app/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: ai.benroberts. Endpoint host: b4-index.vercel.app. ARD identifier: urn:air:ai.benroberts:mcp:b4-index.
First indexed 31 August 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.