MCP server

Browser Compat

io.github.cyanheads/browser-compat-mcp-server

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Browser compatibility and Baseline status for any web feature — offline, from bundled MDN data.

Source

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

5

Token cost

About 3,363 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http browser-compat-mcp-server https://browser-compat.caseyjhand.com/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.browser-compat-mcp-server]
url = "https://browser-compat.caseyjhand.com/mcp"

Gemini CLI

{"mcpServers":{"browser-compat-mcp-server":{"httpUrl":"https://browser-compat.caseyjhand.com/mcp"}}}

Cursor

{"mcpServers":{"browser-compat-mcp-server":{"url":"https://browser-compat.caseyjhand.com/mcp"}}}

VS Code

{"servers":{"browser-compat-mcp-server":{"type":"http","url":"https://browser-compat.caseyjhand.com/mcp"}}}

Antigravity

agy mcp add browser-compat-mcp-server https://browser-compat.caseyjhand.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"browser-compat-mcp-server","server_url":"https://browser-compat.caseyjhand.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"browser-compat-mcp-server","server_url":"https://browser-compat.caseyjhand.com/mcp"}

Tools

• browsercompat_check_baseline ~521 tokens
  Check whether web features are safe to ship: Baseline state and the date it crossed, the browser and version that limits support, whether the feature is deprecated or discouraged, and the share of tracked global traffic that requiring it would exclude. Evaluates up to 20 BCD keys or web-features ids
• browsercompat_compare_support ~1157 tokens
  Compute whether a set of web features clears an explicit browserslist target query. Compares up to 20 features per call; up to 100 may be sent, and entries past the 20th come back unevaluated in omitted_features for the next call. Every call evaluates the whole query: each feature gets a verdict, th
• browsercompat_get_feature ~769 tokens
  Get the compatibility record for one web feature: Baseline state and the date it crossed, deprecation and standards status, per-browser version added and removed with flags, vendor prefixes and partial-implementation notes — with every other support statement recorded for that browser, such as an ea
• browsercompat_list_reference ~288 tokens
  Enumerate the reference vocabulary this server uses: BCD namespaces, BCD browser ids, browserslist agent ids and their BCD counterparts, Baseline states, web-features groups, and ECMAScript snapshots. Use it to build valid inputs for the other tools and to see which target browsers can be evaluated.
• browsercompat_search_features ~628 tokens
  Find web features by plain name or keyword when the canonical key is unknown, across CSS, JavaScript, HTML, Web APIs, SVG, MathML, WebAssembly, and HTTP headers. Returns ranked matches with the BCD key, the web-features id, the Baseline state, a one-line support summary, and which field matched. Fee

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