MCP server

wasm-mcp

io.github.xyzzylabs/wasm-mcp

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

Read-only MCP server for the WebAssembly spec: instructions, types, sections, search, proposals.

Website Source

At a glance

Type

MCP server

Publisher

xyzzylabs.ai (verified by the MCP Registry)

Status

Working at last check

Tools

9

Token cost

About 1,434 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

Claude Code

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

Claude Desktop

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

Codex (config.toml)

[mcp_servers.wasm-mcp]
url = "https://mcp.xyzzylabs.ai/wasm/mcp"

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"wasm-mcp":{"type":"http","url":"https://mcp.xyzzylabs.ai/wasm/mcp"}}}

Antigravity

agy mcp add wasm-mcp https://mcp.xyzzylabs.ai/wasm/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":"wasm-mcp","server_url":"https://mcp.xyzzylabs.ai/wasm/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"wasm-mcp","server_url":"https://mcp.xyzzylabs.ai/wasm/mcp"}

Tools

• instruction_get ~187 tokens
  Fetch one WebAssembly instruction by mnemonic (`i32.add`) or binary opcode (`0x6a`, multi-byte `0xfd 0x89 0x02`): opcode bytes, category, introducing version, stack type signature, validation/execution anchors + URLs, and `traps` (runtime trap conditions with canonical names; empty + `can_trap:false
• instruction_list ~230 tokens
  Enumerate WebAssembly instructions, filterable by `category`, `introduced_in` (1.0|2.0|3.0), mnemonic `prefix`, and `can_trap` (only trapping / only non-trapping). Rows (incl. `can_trap`) sorted by opcode.
• instruction_search ~114 tokens
  Ranked free-text search across instruction mnemonics, categories, and opcode hex. Returns hits with a `matched_on` field.
• proposal_list ~210 tokens
  List WebAssembly proposals + phases. Filter by `status` (phase-0…phase-5, finished, inactive), `phase` (0–5), `champion`, `affects` (core|js-api|web-api), or `contains`.
• section_get ~148 tokens
  Fetch one spec clause by id or anchor across `core` / `js-api` / `web-api` (`syntax-numtype`, `valid-unreachable`, `modules`, `streaming-modules`, …): title, prose, cross-references, SpecTec formal refs, and rendered URL.
• section_list ~206 tokens
  Navigate the clause tree of a spec (`core` / `js-api` / `web-api`), filterable by source `path` (`syntax`, `valid`, `exec`, `binary`, `text`, `appendix`), `anchor_prefix`, `titled_only`, and `max_level`.
• spec_search ~158 tokens
  Full-text search across clause anchors, titles, and prose of a spec (`core` / `js-api` / `web-api`). Ranked anchor-exact > title > anchor > prose, with snippets for body matches.
• spec_version ~66 tokens
  Return this server's package version plus the pinned upstream commit SHA(s) the bundled data was indexed from.
• type_get ~115 tokens
  Look up a value type (`i32`, `funcref`, `v128`, …) or type form (`functype`, `limits`, `memtype`, …): classification, sibling members, defining clause prose, formal refs, and URL.

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