Wasm MCP

Model Context Protocol server for the WebAssembly core specification.

People who work with language spec, specification and wasm and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-09-14 · ★ 2 · #383 OF 945 MAINTAINED OTHER · VERIFIED 2026-09-18

MIT · TypeScript servers · how we verify → /methodology

01 · Install Wasm MCP

before you install - you'll need

The README does not document required environment variables for a basic install.

Claude Code

claude mcp add xyzzylabs-wasm-mcp --transport http https://mcp.xyzzylabs.ai/wasm/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "xyzzylabs-wasm-mcp": {
      "url": "https://mcp.xyzzylabs.ai/wasm/mcp"
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

https://mcp.xyzzylabs.ai/wasm/mcp

transport: streamable-http

endpoint alive - responded to MCP initialize · probed 2026-09-18

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions · remote - your agent's requests go to mcp.xyzzylabs.ai

endpoint auth accepted our unauthenticated MCP initialize - no credentials needed to connect

license MIT - declared in the repository

npm package wasm-mcp - unscoped; check the name against the project README before installing

registry namespace io.github.xyzzylabs is GitHub-verified and matches the repo owner

03 · What Wasm MCP can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v0.2.16 · 2026-07-11

Automated PATCH refresh - upstream WebAssembly/spec or proposals moved. Same code, new spec data. See spec_version for the current SHAs.

v0.2.15 · 2026-07-09

Automated PATCH refresh - upstream WebAssembly/spec or proposals moved. Same code, new spec data. See spec_version for the current SHAs.

v0.2.14 · 2026-07-08

Automated PATCH refresh - upstream WebAssembly/spec or proposals moved. Same code, new spec data. See spec_version for the current SHAs.

04 · Who maintains Wasm MCP

wasm-mcp is maintained by xyzzylabs. We track 2 MCP servers from xyzzylabs - 2 actively maintained, 4 combined GitHub stars, oldest repo from May 2026. Full record: all servers from xyzzylabs.

tc39-mcp Independent MCP server for the TC39 specs (ECMA-262 + ECMA-402): clauses, search, diffs, history. ★ 2

05 · Facts

repository: github.com/xyzzylabs/wasm-mcp
website: https://mcp.xyzzylabs.ai/wasm/
category: other - ranked #383 of 945 actively-maintained other servers as of 2026-09-18.
release cadence: 8 releases in the last 90 days (latest 2026-07-11)
registry: io.github.xyzzylabs/wasm-mcp (active, first published 2026-06-07 · 18 versions)
packages: npm:wasm-mcp

06 · Wasm MCP FAQ

What is Wasm MCP?

Model Context Protocol server for the WebAssembly core specification.

Is Wasm MCP still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-14 and it shipped 8 releases in the last 90 days. We re-verify nightly.

How do I install Wasm MCP?

Run `npx -y wasm-mcp`. The README does not document required environment variables for a basic install. You can also paste the ready-made client config above.

Does Wasm MCP require authentication?

No - the endpoint accepted our unauthenticated MCP initialize when probed on 2026-09-18; you can connect without credentials.

07 · Alternatives to Wasm MCP

Alternatives to Wasm MCP

Maintained other servers if Wasm MCP isn't the fit.

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