Skills/npm/arc-1

arc-1@1.10.1

CAUTION· startup only

Publisher claims: "ARC-1 — MCP Server for SAP ABAP Systems" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher arc-mcp · publishing for 228 daysInstalls 13,724Last detonated 5d ago
What would fix thisWatchDispute verdict

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: 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
OAUTH_LOGGED_OUT_PATHConfiguration, not credentials: ARC1_LOG_HTTP_DEBUG, BROWSER, BSP_OBJECTS_PATH, FLP_SERVICE_PATH, MAX_GREP_PATTERN_LENGTH, SAP_BTP_DESTINATION, SAP_BTP_PP_DESTINATION, SAP_BTP_SERVICE_KEY, SAP_BTP_SERVICE_KEY_FILE
Where it talks to
arc1.invalid, arc-1-mcp.com (its own)Also sap.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 with a scoped credential, under the guard, and read the third-party hosts first. The code names sap.com as well as its own vendor. The guard injects OAUTH_LOGGED_OUT_PATH only into requests to arc1.invalid (and its subdomains) and refuses the rest.

$vet-skills run --secrets OAUTH_LOGGED_OUT_PATH=arc1.invalid -- npx -y arc-1

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 2026-11-09 and scored it 76/100 (Caution). It is not known to be malicious, but it has behaviour or code a security policy should decide on before install. Notable findings: Auto-update or dynamic fetch configuration; Credential pass-through configuration; Credential pass-through configuration. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 37 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
16sprocessdependency install exit 0
36sclaimedstartup only: exited (0) before answering · code: 'ERR_MODULE_NOT_FOUND', url: 'file:///tmp/ks-detonate-BSP9je/task/home/work/acme-api/.claude/skills/arc-1/dist/handlers/dispatch.js' } Node.js v22.23.4
36sprocessscript backend runs setup only
36sprocessno install scripts to re-run

Static findings

HIGH
Auto-update or dynamic fetch configurationdist/adt/config.d.ts:46 · Auto-update or dynamic fetch configuration — agent may load new code at runtime/** Path to cookie file — enables hot-reload on stale auth */Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File type combined with upload actiondist/cli.js:318 · File type combined with upload action — agent may exfiltrate local data filesconsole.log(JSON.stringify(match.inputSchema, null, 2));Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
HIGH
Credential pass-through configurationdist/adt/http.js:1194 · Credential pass-through configuration — agent relays sensitive credentialsproxyAuth = `Bearer ${proxyToken}`;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/adt/http.js:1193 · Credential pass-through configuration — agent relays sensitive credentialsconst proxyToken = await awaitWithinRequestBudget(proxy.getProxyToken(), options);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/adt/config.d.ts:68 · Credential pass-through configuration — agent relays sensitive credentials* When set, replaces the regular connectivity proxy token in the Proxy-Authorization header.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 packagepackage.json:100 · npx invocation of non-well-known package — may execute untrusted code…on": "node scripts/ci/assert-required-test-execution.mjs", "btp:validate": "npx mbt validate && npx mbt validate -e mta-overrides.mtaext.example && npx mbt validat…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
File type combined with upload actiondist/cli-args.js:54 · File type combined with upload action — agent may exfiltrate local data filesconst fromJson = opts.json ? readJsonInput(opts.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 pathsdist/cli.js:690 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files// IDE links are MCP presentation, never part of CLI source/JSON exports (including .env opt-in).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/server/types.js:7 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files* 3. .env fileFix: 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 actiondist/cli.js:317 · File type combined with upload action — agent may exfiltrate local data filesconsole.log('\nInput schema:');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 pathsdist/index.js:12 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files// Load .env file (if present) before anything else.Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05

Cost to the agent

Instructions loaded
≈43 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 arc-1@1.10.1 as of 5d ago. This is the package itself, not its dependencies.

What would make this Verified

4 points to 80 · weights: behavior 45%, static 25%, prompt 15%, publisher 15%
  1. Unclaimed publisher≈ +8 on the totalClaim arc-mcp: a verified publisher gets +50 on publisher trust. It is free and usually instant with GitHub sign-in.
  2. Auto-update or dynamic fetch configuration≈ +4 on the totalPin versions and sources; vendor anything fetched at install time.
  3. 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.
  4. 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.
  5. File type combined with upload action≈ +2 on the totalRemove the call, or declare the host in frontmatter and explain in the README what is sent and why.
  6. 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 arc-mcpPropose a patch to the maintainer