Skills/npm/mcp

mcp@0.13.75

CAUTION· install only

Publisher claims: "Carrier MCP — natural-language control of MVNO/eSIM fleets via the network OCS. Stdio mode for direct integration with Claude Desktop, Cursor, Windsurf, and MCP-compatible clients. Ships the `carrier` CLI (plugin install + white-label eSIM storefront scaf" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher carrierllc · publishing for 188 daysInstalls 5,987Last detonated 2 h ago
What would fix thisWatchDispute verdict

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

What this means for the label: Caution 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
CARRIER_API_KEYCARRIER_MCP_OAUTH_FILECARRIER_MCP_OAUTH_OWNERCARRIER_MCP_OAUTH_SERVERCARRIER_OAUTH_ACCOUNTCARRIER_OAUTH_BINDINGCARRIER_OAUTH_EXPIRES_ATCARRIER_OAUTH_HANDOFFCARRIER_OAUTH_ORIGINCARRIER_OCS_API_TOKENCARRIER_ORG_API_KEYCLAUDE_CODE_CUSTOM_OAUTH_URLCLERK_SECRET_KEYCLERK_SECRET_KEY_PRODUCTIONESIMVAULT_API_TOKENNEXT_PUBLIC_PASSWORD_RESET_ENABLEDRESEND_API_KEYRESEND_API_KEYS_URL or --confirm-token / --entitlement-token / --new-token / --no-secretsConfiguration, not credentials: CARRIER_HOME, CARRIER_MCP_TIMEOUT_MS, CLAUDE_CONFIG_DIR, CLAUDE_SECURESTORAGE_CONFIG_DIR, DISCOVERY_PATH, HERMES_HOME, NETWORK_DEFAULT_KEY_PREFIX, NEXT_PUBLIC_APP_URL, NEXT_PUBLIC_BRAND_NAME, NEXT_PUBLIC_CLERK_INSTANCE, NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY, NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY_PRODUCTION, NEXT_PUBLIC_COUNTRY_CATALOG, NEXT_PUBLIC_LIGHTNING_TIER, REDIRECT_PATH
Where it talks to
carrier.llc (its own)Also clerk.com, resend.com, esimvault.cloud, ant.dev, fedstart.com, claude.ai, apple.com, wa.me — 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
use of the skill by an agent

Connect it with a scoped credential, under the guard, and read the third-party hosts first. The code names clerk.com, resend.com, esimvault.cloud, ant.dev, fedstart.com, claude.ai, apple.com, wa.me as well as its own vendor. The guard injects CARRIER_API_KEY, CARRIER_MCP_OAUTH_FILE, CARRIER_MCP_OAUTH_OWNER, CARRIER_MCP_OAUTH_SERVER, CARRIER_OAUTH_ACCOUNT, CARRIER_OAUTH_BINDING, CARRIER_OAUTH_EXPIRES_AT, CARRIER_OAUTH_HANDOFF, CARRIER_OAUTH_ORIGIN, CARRIER_OCS_API_TOKEN, CARRIER_ORG_API_KEY, CLAUDE_CODE_CUSTOM_OAUTH_URL, CLERK_SECRET_KEY, CLERK_SECRET_KEY_PRODUCTION, ESIMVAULT_API_TOKEN, NEXT_PUBLIC_PASSWORD_RESET_ENABLED, RESEND_API_KEY, RESEND_API_KEYS_URL only into requests to carrier.llc (and its subdomains) and refuses the rest.

$vet-skills run --secrets CARRIER_API_KEY=carrier.llc,CARRIER_MCP_OAUTH_FILE=carrier.llc,CARRIER_MCP_OAUTH_OWNER=carrier.llc,CARRIER_MCP_OAUTH_SERVER=carrier.llc,CARRIER_OAUTH_ACCOUNT=carrier.llc,CARRIER_OAUTH_BINDING=carrier.llc,CARRIER_OAUTH_EXPIRES_AT=carrier.llc,CARRIER_OAUTH_HANDOFF=carrier.llc,CARRIER_OAUTH_ORIGIN=carrier.llc,CARRIER_OCS_API_TOKEN=carrier.llc,CARRIER_ORG_API_KEY=carrier.llc,CLAUDE_CODE_CUSTOM_OAUTH_URL=carrier.llc,CLERK_SECRET_KEY=carrier.llc,CLERK_SECRET_KEY_PRODUCTION=carrier.llc,ESIMVAULT_API_TOKEN=carrier.llc,NEXT_PUBLIC_PASSWORD_RESET_ENABLED=carrier.llc,RESEND_API_KEY=carrier.llc,RESEND_API_KEYS_URL=carrier.llc -- npx -y @carrierllc/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 (1 scenario; nothing executable in the bundle ran; the trace covers the install step only) on 2026-11-14 and scored it 78/100 (Caution). It is not known to be malicious, but it has behaviour or code a security policy should decide on before install. Notable findings: Credential pass-through configuration; Credential pass-through configuration; Access to sensitive file paths. 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
Credential pass-through configurationdist/chunk-LO324UTL.js:3615 · Credential pass-through configuration — agent relays sensitive credentialsproxySecret,Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST02
HIGH
Credential pass-through configurationdist/chunk-LO324UTL.js:3644 · Credential pass-through configuration — agent relays sensitive credentialsproxySecret: options.fixedEgressProxySecret,Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST02
MEDIUM
npx invocation of non-well-known packageplugin/carrier/skills/issue-esim/SKILL.md:24 · npx invocation of non-well-known package — may execute untrusted codenpx skills add https://carrier.llc/.well-known/agent-skills/issue-esim -g -a cursor -a claude-code -yFix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Access to sensitive file pathsdist/chunk-LO324UTL.js:368 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesconst file = join(dir, ".env");Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsdist/cli.js:342 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesconst temporary = join5(dir, `.credentials-${randomUUID()}.json`);Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsdist/cli.js:6870 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files[`cd ${target}`, "pnpm build", "Check env keys in .env.local if the build mentions Clerk"].join("\n"),Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsdist/cli.js:2792 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"Put the key in the storefront's .env.local as RESEND_API_KEY.",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsdist/cli.js:746 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesconst file = explicitFile || join6(selection.home, ".credentials.json");Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsdist/chunk-LO324UTL.js:912 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesconst envPath = `${storefront}/.env.local`;Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsdist/chunk-LO324UTL.js:641 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesconst global = await readEnvFile(join2(home, ".env"));Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsdist/cli.js:224 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesconst envPath = join3(target, ".env.local");Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsdist/chunk-SHKKVIIA.js:63 · 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
HIGH
Access to sensitive file pathsplugin/carrier/skills/storefront/SKILL.md:74 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files`.env.local` *before* the build — pushing one as a runtime secret looks like itFix: 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 packageplugin/carrier/skills/issue-esim/SKILL.md:27 · npx invocation of non-well-known package — may execute untrusted code`skills` 1.7.0 requires Node 22.20 or newer (`styleText` in a Node 20 runtime throws a SyntaxError before this even installs). On Node 20, run either command through `npx -p node@22` instead:Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Access to sensitive file pathspackage.json:31 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"!templates/**/.env.local"Fix: 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 packagedist/chunk-LO324UTL.js:295 · npx invocation of non-well-known package — may execute untrusted codereason: def.npxPkg ? `${def.bin} not found \u2014 install it, or make npx available.` : `${def.bin} not found \u2014 install the Fly CLI (brew install flyctl).`Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Credential pass-through configurationdist/chunk-LO324UTL.js:3650 · Credential pass-through configuration — agent relays sensitive credentialsconst resolvedProxySecret = optConfig.proxySecret ?? envConfig?.proxySecret;Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST02
MEDIUM
npx invocation of non-well-known packageplugin/carrier/skills/issue-esim/SKILL.md:18 · npx invocation of non-well-known package — may execute untrusted codenpx skills add https://carrier.llc -g -a cursor -a claude-code -yFix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Access to sensitive file pathsplugin/carrier/skills/storefront/SKILL.md:24 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files…→ `carrier site clerk <dir>` Four tiers, best first: reuse keys already in `.env.local` or the environment (a redeploy must never orphan existing buyer accounts…Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsdist/chunk-LO324UTL.js:651 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesconst path = join2(storefront, ".env.local");Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
HIGH
Access to sensitive file pathsdist/chunk-LO324UTL.js:640 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system filesconst local = await readEnvFile(join2(storefront, ".env.local"));Fix: 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 packagedist/chunk-LO324UTL.js:903 · npx invocation of non-well-known package — may execute untrusted codereturn { ok: false, tier: "cli-keyless", reason: "npx not found \u2014 cannot run the Clerk CLI." };Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagedist/cli.js:6776 · npx invocation of non-well-known package — may execute untrusted code"Reinstall the package: npm i -g @carrierllc/mcp (or npx -y -p @carrierllc/mcp carrier plugin install)",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Credential pass-through configurationdist/chunk-LO324UTL.js:3607 · Credential pass-through configuration — agent relays sensitive credentialsconst proxySecret = env["CARRIER_OCS_PROXY_SECRET"] ?? env["OCS_FIXED_EGRESS_PROXY_SECRET"] ?? env["OCS_PROXY_SECRET"];Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST02
MEDIUM
npx invocation of non-well-known packageplugin/carrier/skills/onboard/SKILL.md:14 · npx invocation of non-well-known package — may execute untrusted code4. **Storefront** — scaffold + deploy the white-labeled site: `npx @carrierllc/cli site create` then `site deploy` (see `/carrier:storefront`). Brand it for the operator.Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packageplugin/carrier/skills/issue-esim/SKILL.md:31 · npx invocation of non-well-known package — may execute untrusted codenpx -y -p node@22 -p skills -- skills add https://carrier.llc/.well-known/agent-skills/issue-esim -g -a cursor -a claude-code -yFix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packageplugin/carrier/skills/issue-esim/SKILL.md:30 · npx invocation of non-well-known package — may execute untrusted codenpx -y -p node@22 -p skills -- skills add https://carrier.llc -g -a cursor -a claude-code -yFix: Pin versions and sources; vendor anything fetched at install time.
AST06

Cost to the agent

Instructions loaded
≈9,146 tok
17 files · 80 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 @carrierllc/mcp@0.13.75 as of 2 h ago. This is the package itself, not its dependencies.

What would make this Verified

2 points to 80 · weights: behavior 45%, static 25%, prompt 15%, publisher 15%
  1. Unclaimed publisher≈ +8 on the totalClaim carrierllc: a verified publisher gets +50 on publisher trust. It is free and usually instant with GitHub sign-in.
  2. Credential pass-through configuration≈ +4 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  3. Access to sensitive file paths≈ +4 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  4. npx invocation of non-well-known package≈ +2 on the totalPin versions and sources; vendor anything fetched at install time.
Publish a new version to npm, then queue it here. Not your skill? Claim the handle to get verdict changes by email.Claim carrierllcPropose a patch to the maintainer