Skills/npm/ctxlint

ctxlint@0.28.2

CAUTION· not started

Publisher claims: "Linter for AI agent context files and MCP configs: CLAUDE.md, AGENTS.md, .cursorrules, .mcp.json - catches broken paths, wrong commands, leaked secrets" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher yawlabs · publishing for 223 daysInstalls 128KLast detonated 40 h ago
What would fix thisWatchDispute verdict

Coverage

Not started: dependency install failed; the server itself was not observed.
Tested
the dependency install step · every file read, file written and host contacted by what ran
Not tested
server startup · the tool list · tool behavior

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
no credential variables read in the code
Where it talks to
no vendor host named in the codeAlso oamjs.org — 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
server startup · the tool list · tool behavior

Connect it under the guard. Not started: dependency install failed; the server itself was not observed. The code names no credential variable; the guard pins the network to what the honeypot saw and logs every call.

$vet-skills run --net declared -- npx -y @yawlabs/ctxlint

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; not started: dependency install failed; the server itself was not observed) on 2026-11-12 and scored it 67/100 (Caution). It is not known to be malicious, but it has behaviour or code a security policy should decide on before install. Notable findings: Text pushed off-screen by whitespace; Access to sensitive file paths; Reads credential paths from the home directory. Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 16 s · 2 scenarios · 0 deviations
t+CategoryObserved action
0.0sprocessno install scripts in bundle
15sprocessdependency install exit 1 · (Use `node --trace-warnings ...` to show where the warning was created) npm error Cannot read properties of null (reading 'edgesOut') npm error A complete log of this run can be found in: /tmp/ks-detonate-uk65c2/task/home/.npm/_logs/2026-11-12T21_04_05_235Z-debug-0.log
15sclaimednot started: dependency install failed (exit 1); the server itself was not observed
15sprocessscript backend runs setup only
15sprocessno install scripts to re-run

Static findings

HIGH
Text pushed off-screen by whitespaceCONTEXT_LINT_SPEC.md:493 · Text pushed off-screen by whitespace| `{count} always-loaded files total {N} tokens — loaded every session` |Fix: Remove the text that addresses the agent rather than the reader; describe behavior, do not instruct.
AST01
HIGH
Access to sensitive file pathsmcp-config-lint-rules.json:453 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"globalConfig": "~/.aws/amazonq/mcp.json",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 packageaction.yml:37 · npx invocation of non-well-known package — may execute untrusted coderun: npx -y "@yawlabs/ctxlint@${CTXLINT_VERSION}" ${CTXLINT_ARGS}Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
CRITICAL
Reads credential paths from the home directoryagent-session-lint-rules.json:200 · Reads credential paths from the home directory"historyLocation": "~/.aws/amazonq/history/chat-history-*.json",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST03
MEDIUM
npx invocation of non-well-known packagecontext-lint-rules.json:147 · npx invocation of non-well-known package — may execute untrusted code"description": "npx package is not in project dependencies.",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagecontext-lint-rules.json:148 · npx invocation of non-well-known package — may execute untrusted code"trigger": "npx package is not in package.json dependencies/devDependencies and not in node_modules/.bin.",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
Process kill commandbin/ctxlint.mjs:577 · Process kill command — agent can terminate processes// signals: child.kill IGNORES the name and calls TerminateProcess -- anFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
npx invocation of non-well-known package.pre-commit-hooks.yaml:7 · npx invocation of non-well-known package — may execute untrusted codeentry: npx @yawlabs/[email protected] --strictFix: Pin versions and sources; vendor anything fetched at install time.
AST06
HIGH
Access to sensitive file pathsagent-session-lint-rules.json:200 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files"historyLocation": "~/.aws/amazonq/history/chat-history-*.json",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
MEDIUM
Process kill commandbin/ctxlint.mjs:578 · Process kill command — agent can terminate processes// immediate hard kill (verified: a child with a SIGTERM handler never runsFix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
HIGH
Access to sensitive file pathsmcp-config-lint-rules.json:269 · Access to sensitive file paths — SSH keys, AWS credentials, env files, or system files…hell environment. Deliberately info severity: many env vars are set only in CI, .env files, or shell profiles unavailable during linting.", "trigger": "Env va…Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST05
CRITICAL
Reads credential paths from the home directorymcp-config-lint-rules.json:453 · Reads credential paths from the home directory"globalConfig": "~/.aws/amazonq/mcp.json",Fix: Stop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
AST03
MEDIUM
Process kill commandbin/ctxlint.mjs:582 · Process kill command — agent can terminate processes// child, so on Windows the timer below is the only kill we issue.Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
npx invocation of non-well-known packagemcp-config-lint-rules.json:211 · npx invocation of non-well-known package — may execute untrusted code"description": "On Windows, npx commands in stdio configs require a cmd /c wrapper to spawn correctly.",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagemcp-config-lint-rules.json:213 · npx invocation of non-well-known package — may execute untrusted code"message": "Server \"{name}\": npx requires \"cmd /c\" wrapper on Windows",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
npx invocation of non-well-known packagemcp-config-lint-rules.json:212 · npx invocation of non-well-known package — may execute untrusted code"trigger": "Platform is Windows, command is \"npx\" (not \"cmd\" with /c npx in args).",Fix: Pin versions and sources; vendor anything fetched at install time.
AST06

Cost to the agent

Instructions loaded
≈74 tok
1 file · 16 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 @yawlabs/ctxlint@0.28.2 as of 39 h ago. This is the package itself, not its dependencies.

What would make this Verified

13 points to 80 · weights: behavior 45%, static 25%, prompt 15%, publisher 15%
  1. Reads credential paths from the home directory≈ +9 on the totalStop enumerating or reading credential locations; take secrets from a declared environment variable the user sets on purpose.
  2. Unclaimed publisher≈ +8 on the totalClaim yawlabs: a verified publisher gets +50 on publisher trust. It is free and usually instant with GitHub sign-in.
  3. Hidden instructions≈ +6 on the totalRemove HTML comments, zero-width characters and white-on-white text that carry instructions. Everything the agent is meant to read should be visible to the person reading the file.
  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. npx invocation of non-well-known package≈ +2 on the totalPin versions and sources; vendor anything fetched at install time.
  6. Process kill command≈ +2 on the totalBuild commands from fixed arguments; do not interpolate untrusted strings into a shell.
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