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B4 Index

connects

b4-index.vercel.app

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

https://b4-index.vercel.app/mcpWebsiteNo authMCP 2025-11-25v3.4.9last checked 8 Oct 2026spoke MCP on 100% of 91 checks (30 days)initialize in 2510 ms

Will my client connect?

Decided from what the probe found at the endpoint, and from what each client's own documentation says it can complete. Every row carries the day that documentation was read.

✓Claude CodeConnects

The endpoint answers an anonymous handshake, so no credential is needed.

claude mcp add --transport http b4-index https://b4-index.vercel.app/mcp

Claude Code docs · read on 2026-08-30

✓Claude (claude.ai & Desktop)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Connectors → Add custom connector, then paste https://b4-index.vercel.app/mcp.

Claude (claude.ai & Desktop) docs · read on 2026-08-30

✓ChatGPTConnects

The endpoint answers an anonymous handshake, so no credential is needed.

Settings → Apps → Advanced settings → Developer mode, then create a connector pointing at https://b4-index.vercel.app/mcp.

ChatGPT docs · read on 2026-08-30

✓CursorConnects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "mcpServers": {
    "b4-index": {
      "url": "https://b4-index.vercel.app/mcp"
    }
  }
}

Cursor docs · read on 2026-08-30

✓VS Code (Copilot)Connects

The endpoint answers an anonymous handshake, so no credential is needed.

{
  "servers": {
    "b4-index": {
      "type": "http",
      "url": "https://b4-index.vercel.app/mcp"
    }
  }
}

VS Code (Copilot) docs · read on 2026-08-30

How to authenticate

Checked against the endpoint by our probe on 8 Oct 2026. These are the capabilities the server advertises, not a prediction about any particular client.

Scheme	No auth
Protected-resource metadata	✓Published (RFC 9728)
Anonymous access	Handshake succeeds; 5 tools listable

Tools

b4_auditb4_browseb4_compareb4_recommendb4_score

Contract history

4 Oct 2026v3.4.91 cosmeticinstructions rewritten

Instructions rewritten: b4_browse. The description an agent follows changed; the callable contract may not have.

23 Sep 2026v3.4.9no contract changes

22 Sep 2026v3.4.61 breaking4 cosmeticinstructions rewritten

Breaking: b4_audit

Instructions rewritten: b4_audit, b4_browse, b4_compare, b4_recommend, b4_score. The description an agent follows changed; the callable contract may not have.

19 Sep 2026v3.4.05 cosmeticinstructions rewritten

Instructions rewritten: b4_audit, b4_browse, b4_compare, b4_recommend, b4_score. The description an agent follows changed; the callable contract may not have.

19 Sep 2026v3.4.05 breaking

Breaking: b4_audit, b4_browse, b4_compare, b4_recommend, b4_score

7 Sep 2026v3.3.05 compatibleinstructions rewritten

Instructions rewritten: b4_audit, b4_browse, b4_compare, b4_recommend, b4_score. The description an agent follows changed; the callable contract may not have.

24 Aug 2026v3.3.0first recorded contract

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Status badge

Status for a README, from the last probe — cached an hour, so up to seven hours behind the endpoint. Links back to this page.

[![MCP status](https://mcpi.app/servers/b4-index/badge.svg)](https://mcpi.app/servers/b4-index)