Excalidraw (fromsko) MCP Server
@fromsko/excalidraw-mcp-server
npm
v1.0.0
Published by @fromsko — no publish provenance, so origin is unverified, but the source is public: the repository link below is self-declared yet readable, so you can inspect the code before adopting it.
Advanced MCP server for Excalidraw with real-time canvas, WebSocket sync, and comprehensive diagram management
The grade answers one question — how safe is this server for you to adopt — so it is computed in two auditable stages. Nothing below is an opinion or an LLM's guess; every line is a real term the deterministic engine applied, and the same input always yields the same number.
1. Threat score — 100 − 1.2 = 99. What the published surface and source actually contain:
| Points | What was found | Category |
|---|---|---|
| −1.2 | Hardcoded Google API key in server code MTC-SRC-008 | exfiltration |
2. Client adoption risk — 99 − 7 = 92. Three small, subtract-only factors that reflect your risk in adopting it — a clean scan proves less on a powerful, unverified or barely-inspectable package, so the grade says so plainly:
| Points | Adoption-risk factor |
|---|---|
| −6 | capability blast radius (high) — client exposure if the model is manipulated |
| −1 | publisher verification (public source) — no provenance, but the source is public and inspectable |
Capability observations and info notes are shown under Findings but never scored.
Open any row's finding below for the file, line and evidence behind a deduction.
Findings 2
high Dynamic code execution in server code (dist/assets/subset-shared.chunk-GfUGMiO1.js)MTC-SRC-001
In the server's implementation (`dist/assets/subset-shared.chunk-GfUGMiO1.js:2`): Evaluating strings as code is the most direct RCE primitive; if any tool input reaches it, the server executes attacker-chosen code. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: mA(A,g){return A=nA(A),new Function("body",`return function ${A}() { "use strict"; return body.apply(this, argum
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server dist/assets/subset-shared.chunk-GfUGMiO1.js
low Hardcoded Google API key in server code (dist/assets/main-Dc-yvySa.js)MTC-SRC-008
A hardcoded Google API key (a public Firebase/web API key) appears in `dist/assets/main-Dc-yvySa.js:41`. Verify whether this is a real credential; if so, remove and rotate it.
Evidence: Google API key: AIza…(redacted)
Fix: Remove the secret, rotate it, and load credentials from the environment or a secret store.
Location: server dist/assets/main-Dc-yvySa.js
Tools 13
Each tool and what it can reach — statically extracted from the published source.
align_elementsno sensitive capabilitybatch_create_elementsno sensitive capabilitycreate_elementno sensitive capabilitydelete_elementno sensitive capabilitydistribute_elementsno sensitive capabilityget_resourceno sensitive capabilitygroup_elementsno sensitive capabilitylock_elementsno sensitive capabilitymcp-excalidraw-serverno sensitive capabilityquery_elementsno sensitive capability
Show 3 more tools ↓
ungroup_elementsno sensitive capabilityunlock_elementsno sensitive capabilityupdate_elementno sensitive capability
What this scan could not see
- Tools were statically extracted from the published source (13 recovered), not enumerated from a running server. Tool-poisoning, Unicode-smuggling, capability and toxic-flow analysis ran on this inferred surface, but a mis-parsed registration could be missed or mis-attributed, so tool-derived findings are capped below “confirmed”. To grade the real runtime surface, scan the running server: --command "npx -y <package>".
Versions 1
Scan history per published version. The engine is deterministic — the same version always yields the same score, so a changed score means the package itself changed.
| Version | Score | Findings | Engine | Scanned |
|---|---|---|---|---|
v1.0.0 latest |
A 92/100 | 2 | 1.13.0 | 2026-09-07 |
Embed this score
Show this server's live Trust Score in your README, docs or website. The badge is served straight from the registry and updates automatically after every rescan — no API key needed. It links back to this page, so anyone who sees the grade can also read the findings behind it instead of taking a number on faith.
Verify this score yourself
The score above is reproducible: the same package version always yields the same result. Run it locally or over the free API — no account, no LLM, fully deterministic.
npx mcptrustchecker scan @fromsko/excalidraw-mcp-server --onlineOther implementations of Excalidraw 6
Independent packages implementing the same tool, scanned with the same engine. Compare all 7 side by side →
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