io.github.xyzzylabs/wasm-mcp

up checked 2026-11-11T12:37:57.409Z

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Publisher-provided title

wasm-mcp

Publisher-provided description

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

Summary by lookupd

Lets an agent look up WebAssembly instructions, types, spec clauses, and proposals, read-only, via search and list queries.

Install

Claude Code, remote (streamable-http)

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

Claude Code, npm package (stdio)

claude mcp add wasm -- npx -y wasm-mcp

Codex, remote (streamable-http)

codex mcp add wasm --url https://mcp.xyzzylabs.ai/wasm/mcp

Codex, npm package (stdio)

codex mcp add wasm -- npx -y wasm-mcp

Cursor, remote (streamable-http) → .cursor/mcp.json

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

Cursor, npm package (stdio) → .cursor/mcp.json

{
  "mcpServers": {
    "wasm": {
      "command": "npx",
      "args": [
        "-y",
        "wasm-mcp"
      ]
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (9 tools)

Publisher-provided text

• spec_version Return this server's package version plus the pinned upstream commit SHA(s) the bundled data was indexed from.
• instruction_get Fetch one WebAssembly instruction by mnemonic (`i32.add`) or binary opcode (`0x6a`, multi-byte `0xfd 0x89 0x02`): opcode bytes, category, introducing version, s
• instruction_list Enumerate WebAssembly instructions, filterable by `category`, `introduced_in` (1.0|2.0|3.0), mnemonic `prefix`, and `can_trap` (only trapping / only non-trappin
• instruction_search Ranked free-text search across instruction mnemonics, categories, and opcode hex. Returns hits with a `matched_on` field.
• type_get Look up a value type (`i32`, `funcref`, `v128`, …) or type form (`functype`, `limits`, `memtype`, …): classification, sibling members, defining clause prose, fo
• section_get Fetch one spec clause by id or anchor across `core` / `js-api` / `web-api` (`syntax-numtype`, `valid-unreachable`, `modules`, `streaming-modules`, …): title, pr
• section_list Navigate the clause tree of a spec (`core` / `js-api` / `web-api`), filterable by source `path` (`syntax`, `valid`, `exec`, `binary`, `text`, `appendix`), `anch
• spec_search 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
• proposal_list List WebAssembly proposals + phases. Filter by `status` (phase-0…phase-5, finished, inactive), `phase` (0–5), `champion`, `affects` (core|js-api|web-api), or `c

Details

• Version: 0.2.16
• Transports: streamable-http, stdio
• Uptime (7 days): 100%
• Median latency: 314 ms
• First indexed: 2026-11-01T10:01:02.626Z
• Last seen in registry: 2026-11-01T10:01:03.161Z
• Repository: https://github.com/xyzzylabs/wasm-mcp
• Website: https://mcp.xyzzylabs.ai/wasm/

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