Skills/npm/ucn

ucn@5.5.3

VERIFIED· install only

Publisher claims: "Auditable AST code intelligence for AI agents: 18 task-oriented commands through one MCP tool, CLI, or agent skill. Supports JS/TS, Python, Go, Rust, Java, C, C++, C#, and HTML." Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher mleoca · publishing for 282 daysInstalls 2,242Last detonated 4d ago
$claude mcp add ucn -- npx -y ucn
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Coverage

Nothing executable in the bundle ran; the trace covers the install step only.
Tested
every file read, file written and host contacted by what ran
Not tested
use of the skill by an agent

Is [email protected] safe to install?

KillerSkills ran it in the KillerSkills honeypot sandbox (1 scenario; nothing executable in the bundle ran; the trace covers the install step only) on 2026-11-10 and scored it 86/100 (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 · 0 s · 1 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
0.0sprocessscript backend runs setup only
0.0sprocessscript backend runs setup only
0.0sprocessno install scripts to re-run

Static findings

HIGH
Access to sensitive file pathscore/shared.js:21 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files* `File "/etc/passwd"` or `../../secret` exfiltrates arbitrary files throughFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathscore/discovery.js:29 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files'.env',Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
File type combined with upload actioncli/index.js:1148 · File type combined with upload action — agent may exfiltrate local data filesconsole.log('Note: interactive mode prints text output — run `ucn . <command> --json` one-shot for JSON.');Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
HIGH
Access to sensitive file pathscore/stacktrace.js:93 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files// `File "/etc/passwd"` or `../../secret` would exfiltrate arbitraryFix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
npx invocation of non-well-known packagemcp/server.js:554 · npx invocation of non-well-known package — may execute untrusted code// a stale `npx -y ucn` cache can silently run an older engine than the CLI).Fix: Pin versions and sources; vendor anything fetched at install time.
AST06

Cost to the agent

Instructions loaded
≈66 tok
1 file · 81 in bundle

Tokens estimated at four characters each. Skills load their instruction text when triggered; the figure is what that costs.

Known vulnerabilities

No advisories in OSV for ucn@5.5.3 as of 4d ago. This is the package itself, not its dependencies.