Skills/npm/mcp-excalidraw-server

mcp-excalidraw-server@2.2.0

VERIFIED· startup only

Publisher claims: "Excalidraw toolkit for AI coding agents — agent skill, CLI, and MCP server with a live canvas" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher yctimlin · publishing for 551 daysInstalls 12,311Last detonated 2d ago
$claude mcp add mcp-excalidraw-server -- npx -y mcp-excalidraw-server
WatchReport an issue

Coverage

Startup only; authenticated tool behavior not tested.
Tested
server startup over stdio (initialize sent) · every file read, file written and host contacted by what ran
Not tested
the tool list (the server exited before answering) · what the tools do when called with real credentials

What this means for the label: Verified here covers what ran. The server's tools were not exercised with a real credential, so nothing about their behavior is asserted; the credential summary below says what to do with that.

Before you give it your token

It will ask for
no credential variables read in the code
Where it talks to
excalidraw.com (its own)
What the honeypot saw
no credential files read · no network
What we could not test
the tool list (the server exited before answering) · what the tools do when called with real credentials

Connect it under the guard. Startup only; authenticated tool behavior not tested. The code names no credential variable and talks to excalidraw.com, its own; the guard pins the network to what the honeypot saw and logs every call.

$vet-skills run --net declared -- npx -y mcp-excalidraw-server

Never paste a credential into a chat, a ticket or a report, including ours. How the guard holds it.

Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (2 scenarios; startup only; authenticated tool behavior not tested) on 2026-11-12 and scored it 90/100 (Verified). In what ran, nothing we could detect went wrong: no undeclared network egress, no credential reads, no persistent instruction writes. What it does with a real credential was not observed; the static findings and the publisher carry the rest of the score. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 39 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
19sprocessdependency install exit 0
39sclaimedstartup only: exited (0) before answering · code: 'ERR_MODULE_NOT_FOUND', url: 'file:///tmp/ks-detonate-NtPhZh/task/home/work/acme-api/.claude/skills/mcp-excalidraw-server/dist/core/mcp-dispatch.js' } Node.js v22.23.4
39sprocessscript backend runs setup only
39sprocessno install scripts to re-run

Static findings

MEDIUM
npx invocation of non-well-known packagesrc/core/entry.ts:33 · npx invocation of non-well-known package — may execute untrusted code// npm/npx commonly invoke package bins through symlinks; compare real paths soFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagepackage.json:18 · npx invocation of non-well-known package — may execute untrusted code"build:types": "npx tsc --emitDeclarationOnly",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagepackage.json:20 · npx invocation of non-well-known package — may execute untrusted code"dev:server": "npx tsc --watch",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagepackage.json:17 · npx invocation of non-well-known package — may execute untrusted code"build:server": "npx tsc && node scripts/build-excalidraw-node.mjs",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
Process kill commandsrc/core/spawn.ts:158 · Process kill command — agent can terminate processes// values would make process.kill signal our own process group.Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
npx invocation of non-well-known packagedist/core/entry.js:30 · npx invocation of non-well-known package — may execute untrusted code// npm/npx commonly invoke package bins through symlinks; compare real paths soFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/index.js:58 · npx invocation of non-well-known package — may execute untrusted code// npm/npx commonly invoke package bins through symlinks; isMainModuleFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
Process kill commanddist/core/spawn.js:128 · Process kill command — agent can terminate processes// values would make process.kill signal our own process group.Fix: Build commands from fixed arguments, never from interpolated strings; prefer an API client over shelling out.
AST05
MEDIUM
npx invocation of non-well-known packagepackage.json:35 · npx invocation of non-well-known package — may execute untrusted code"type-check": "npx tsc --noEmit"Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagesrc/index.ts:70 · npx invocation of non-well-known package — may execute untrusted code// npm/npx commonly invoke package bins through symlinks; isMainModuleFix: Pin versions and sources; vendor anything fetched at install time.
AST06

Cost to the agent

Instructions loaded
≈64 tok
1 file · 81 in bundle
Tool list per prompt
≈0 tok
0 tools · 0 per tool
Handshake
no reply
launch to tools/list, stdio
Undocumented tools
0
description under 20 chars · avg 0

Tokens estimated at four characters each. The tool list is re-read by the agent on every turn, so it is the number to compare between servers that do the same job: ranked across the index.

Known vulnerabilities

No advisories in OSV for mcp-excalidraw-server@2.2.0 as of 2d ago. This is the package itself, not its dependencies.