Skills/npm/ue-mcp

ue-mcp@1.4.13

VERIFIED· startup only

Publisher claims: "Unreal Engine MCP server - 31 tools, 3695+ actions for AI-driven editor control" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher db-lyon · publishing for 239 daysInstalls 17,154Last detonated 3d ago
$claude mcp add ue-mcp -- npx -y ue-mcp
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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
ue-mcp.com (its own)Also fab.com — not the publisher's domain; check what for before connecting.
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 ue-mcp.com, its own; the guard pins the network to what the honeypot saw and logs every call.

$vet-skills run --net declared -- npx -y ue-mcp

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 2026-11-11 and scored it 80/100 (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 · 34 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
14sprocessdependency install exit 0
34sclaimedstartup only: exited (0) before answering · code: 'ERR_MODULE_NOT_FOUND', url: 'file:///tmp/ks-detonate-nYtYyy/task/home/work/acme-api/.claude/skills/ue-mcp/dist/daemon/server-mode.js' } Node.js v22.23.4
34sprocessscript backend runs setup only
34sprocessno install scripts to re-run

Static findings

MEDIUM
File type combined with upload actiondist/tools/asset.js:327 · File type combined with upload action — agent may exfiltrate local data files…errides and resolved parameter values. DataTable and CompositeDataTable require .json or .csv; format overrides their serializer. Relative outputPath resolves against the project directory; missing folders are created. replaceExisting defa…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
npx invocation of non-well-known packagedist/cli/update.js:180 · npx invocation of non-well-known package — may execute untrusted code// A bare `npx ue-mcp update` runs the stable line. A binary bridge from a newerFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/doctor.d.ts:48 · npx invocation of non-well-known package — may execute untrusted code/** Client entries whose npx launch that gate refuses for a new release. */Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
Process kill commanddist/tools/asset.js:340 · Process kill command — agent can terminate processes…n a content path and compare disk vs AssetRegistry (including in-memory pending-kill entries). Returns onDiskCount, inMemoryIncludedCount, ghostCount and paths.", "d…Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
npx invocation of non-well-known packagedist/cli/doctor.js:163 · npx invocation of non-well-known package — may execute untrusted code/** Walk up from cwd; the first node_modules/ue-mcp is what npx resolves locally. */Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/doctor.js:324 · npx invocation of non-well-known package — may execute untrusted code* `npx ue-mcp` (an npx server whose args include "ue-mcp" with no @version pinFix: Pin versions and sources; vendor anything fetched at install time.
AST06
LOW
Instructs the agent to modify its persistent memory or instruction filesdist/cli/init.js:441 · Instructs the agent to modify its persistent memory or instruction files · informational: not an instruction file...toggle("agent-guides", "Write the ue-mcp block into AGENTS.md, GEMINI.md or .github/copilot-instructions.md for the clients configured"),Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01
MEDIUM
npx invocation of non-well-known packagedist/cli/resolve.js:102 · npx invocation of non-well-known package — may execute untrusted code`3. Verify with \`npx tsc --noEmit\``,Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
Process kill commanddist/flow/loader.js:244 · Process kill command — agent can terminate processes"Drop the output into BaseColor / Emissive on any material to kill " +Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
npx invocation of non-well-known packagedist/cli/auth-cli.js:36 · npx invocation of non-well-known package — may execute untrusted code`Skip - feedback submissions will refuse until I run \`npx ue-mcp auth\` or call with author="bot"`,Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/doctor.d.ts:102 · npx invocation of non-well-known package — may execute untrusted code/** Walk up from cwd; the first node_modules/ue-mcp is what npx resolves locally. */Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/update.d.ts:20 · npx invocation of non-well-known package — may execute untrusted code* that owns it (an npx cache). It never goes into the project or the workingFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/daemon/shim.js:49 · npx invocation of non-well-known package — may execute untrusted code/** The command line that runs the daemon: this entry, or `npx ue-mcp@<version>` for another version. */Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/doctor.d.ts:82 · npx invocation of non-well-known package — may execute untrusted code* through npx under `gate` without lifting it. npx ignoresFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/doctor.js:5 · npx invocation of non-well-known package — may execute untrusted code* silently shadows the global install (npx prefers the local copy, so updatingFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
Process kill commanddist/tools/editor.js:204 · Process kill command — agent can terminate processes…l Editor gracefully (asks the editor to quit itself via the bridge; never an OS kill of an editor). Acts only on the editor for the loaded project, resolved from the…Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
npx invocation of non-well-known packagedist/cli/resolve.js:139 · npx invocation of non-well-known package — may execute untrusted codeconsole.log(` ${DIM}Example: npx ue-mcp resolve 16${RESET}`);Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
LOW
Unpinned dependencydist/bridge/bridge.js:61 · Unpinned dependency` Update the npm package to match the plugin: 'npm install ue-mcp@latest'.`);Fix: Pin the exact version (`[email protected]`, `==1.2.3`) so every install gets the bytes that were reviewed.
AST06
MEDIUM
npx invocation of non-well-known packagepackage.json:93 · npx invocation of non-well-known package — may execute untrusted code"prepublishOnly": "node -e \"fs.rmSync('dist',{recursive:true,force:true})\" && npx tsc && tsx scripts/generate-default-config.ts && tsx scripts/generate-tool-metadata.ts",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
Process kill commanddist/index.js:39 · Process kill command — agent can terminate processes// kill timeout. A server also serving flows over HTTP stays up for those.Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
npx invocation of non-well-known packagedist/cli/auth-cli.js:6 · npx invocation of non-well-known package — may execute untrusted code* The same flow is offered inside `npx ue-mcp init` when the user opts intoFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/auth-cli.js:39 · npx invocation of non-well-known package — may execute untrusted codeinfo(`Skipped. Run npx ue-mcp auth to set this up later, or pass author="bot" at submit time.`);Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
LOW
Unpinned dependencydist/cli/update.js:208 · Unpinned dependencystep(`Newer prereleases: npm install -g ue-mcp@${tag}. Back to stable: npm install -g ue-mcp@latest.`);Fix: Pin the exact version (`[email protected]`, `==1.2.3`) so every install gets the bytes that were reviewed.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/resolve.d.ts:11 · npx invocation of non-well-known package — may execute untrusted code…RESOLVE_ALLOWED_TOOLS: readonly ["Read", "Glob", "Grep", "Edit", "Write", "Bash(npx tsc --noEmit)", "Bash(git status)", "Bash(git diff:*)", "Bash(git add:*)", "Bash(gi…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagepackage.json:94 · npx invocation of non-well-known package — may execute untrusted code"gen:epic-docs": "npx tsc && node scripts/gen-epic-docs.mjs",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File type combined with upload actiondist/cli/auth-cli.js:30 · File type combined with upload action — agent may exfiltrate local data filesconsole.log(` ${DIM}to post anonymously as the ue-mcp-feedback bot.${RESET}`);Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
npx invocation of non-well-known packagedist/cli/doctor.d.ts:19 · npx invocation of non-well-known package — may execute untrusted code/** Where effectiveNpx comes from; with nothing installed npx fetches the registry's latest. */Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/doctor.js:68 · npx invocation of non-well-known package — may execute untrusted code* through npx under `gate` without lifting it. npx ignoresFix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Auto-update or dynamic fetch configurationdist/tools/editor.js:528 · Auto-update or dynamic fetch configuration — agent may load new code at runtimereload_bridge: specBp("mutate", "Hot-reload Python bridge handlers from disk.", "reload_handlers"),Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/auth-cli.js:48 · npx invocation of non-well-known package — may execute untrusted codeinfo(`Submissions will refuse until you run \`npx ue-mcp auth\` or call with author="bot".`);Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/daemon/shim.js:41 · npx invocation of non-well-known package — may execute untrusted code/** npm's npx entry beside this node, which runs without a shell; null when it is not there. */Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/auth-cli.js:3 · npx invocation of non-well-known package — may execute untrusted code* `npx ue-mcp auth` - interactive GitHub device-flow auth so feedback(submit)Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
LOW
Unpinned dependencydist/cli/doctor.js:526 · Unpinned dependency`Run \`ue-mcp update\` (or npm i -g ue-mcp@latest).`);Fix: Pin the exact version (`[email protected]`, `==1.2.3`) so every install gets the bytes that were reviewed.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/update.js:234 · npx invocation of non-well-known package — may execute untrusted code// 2. A project-local node_modules/ue-mcp shadows every other install (npxFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/daemon/shim.js:108 · npx invocation of non-well-known package — may execute untrusted codewarn("shim", `the bridge is ${version}, newer than this ue-mcp ${packageVersion()}, and npx was not found beside node to run it`);Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/update.js:50 · npx invocation of non-well-known package — may execute untrusted code* that owns it (an npx cache). It never goes into the project or the workingFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/update.js:241 · npx invocation of non-well-known package — may execute untrusted codefail(`Local shadow: node_modules/ue-mcp@${preDoctor.localShadow.version} in ${shadowProjectRoot}. npx runs it, not ${aligned}.`);Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/resolve.js:3 · npx invocation of non-well-known package — may execute untrusted code* npx ue-mcp resolve <issue-number>Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/resolve.js:48 · npx invocation of non-well-known package — may execute untrusted code"Bash(npx tsc --noEmit)",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli/resolve.js:138 · npx invocation of non-well-known package — may execute untrusted codeconsole.log(` ${BOLD}Usage:${RESET} npx ue-mcp resolve <issue-number>`);Fix: Pin versions and sources; vendor anything fetched at install time.
AST06

Cost to the agent

Instructions loaded
≈53 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 ue-mcp@1.4.13 as of 3d ago. This is the package itself, not its dependencies.

ue-mcp@1.4.13 safety verdict: Verified (startup only) — KillerSkills