What can wasm-mcp do?

It exposes 9 tools: spec_version, instruction_get, instruction_list, instruction_search, type_get, section_get, section_list, spec_search, proposal_list.

Is wasm-mcp safe and reliable?

Trust score 78/100 (grade B), based on live reachability, verified publisher, maintenance, adoption, transparency and tool quality. See our methodology.

Servers / Search & Research

wasm-mcp

io.github.xyzzylabs/wasm-mcp

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

Compare Website ↗Source ↗

Yes, your AI can use this right now.Answered a live MCP handshake in 161 ms with no sign-in needed and exposes 9 tools.

Connect it

Settings → Connectors → Add custom connector
URL: https://mcp.xyzzylabs.ai/wasm/mcp

Settings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://mcp.xyzzylabs.ai/wasm/mcp

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

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

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

{
  "mcpServers": {
    "wasm-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "wasm-mcp@0.2.16"
      ]
    }
  }
}

claude mcp add wasm-mcp -- npx -y wasm-mcp@0.2.16

9 tools, verified live

Pulled straight from the server with tools/list on 2026-10-17.

spec_versionread-only

Return this server's package version plus the pinned upstream commit SHA(s) the bundled data was indexed from.

instruction_getread-only

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` when it never traps).

instruction_listread-only

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_searchread-only

Ranked free-text search across instruction mnemonics, categories, and opcode hex. Returns hits with a `matched_on` field.

type_getread-only

Look up a value type (`i32`, `funcref`, `v128`, …) or type form (`functype`, `limits`, `memtype`, …): classification, sibling members, defining clause prose, formal refs, and URL.

section_getread-only

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_listread-only

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_searchread-only

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.

proposal_listread-only

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`.

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9 tools, verified live

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