Skills/npm/axe-mcp-server

axe-mcp-server@1.8.0

CAUTION· install only

Publisher claims: "Axe DevTools accessibility analysis and remediation MCP Server for AI coding agents" Observed in sandbox: no network, touches nothing outside the project, writes no memory.

Registry npm (MCP server)Publisher dequelabs · publishing for 206 daysInstalls 82,684Last detonated 3d 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
no credential variables read in the code
Where it talks to
deque.com (its own)Also datadoghq.com, datadoghq-browser-agent.com, datad0g-browser-agent.com, cloudfront.net, dequelabs.com, fb.me, reactjs.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
use of the skill by an agent

Connect it under the guard. Nothing executable in the bundle ran; the trace covers the install step only. The code names no credential variable and talks to deque.com, its own; the guard pins the network to what the honeypot saw and logs every call.

$vet-skills run --net declared -- npx -y axe-mcp-server

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 2026-11-11 and scored it 70/100 (Caution). It is not known to be malicious, but it has behaviour or code a security policy should decide on before install. Notable findings: navigator.sendBeacon(); document.cookie access; navigator.sendBeacon(). Summary: no network, touches nothing outside the project, writes no memory.

Behavior trace

Honeypot run · 2 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

MEDIUM
MCP server using network transport (SSE/HTTP)credits.json:75 · MCP server using network transport (SSE/HTTP) — data sent over network"path": "/home/runner/work/axe-mcp-server/axe-mcp-server/node_modules/.pnpm/@[email protected]/node_modules/@szmarczak/http-timer",Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
Process kill commandcredits.json:948 · Process kill command — agent can terminate processes…rs) storage adapters\n- Connection errors are passed through (db failures won't kill your app)\n- Supports the current active LTS version of Node.js or higher\n\n## …Fix: Build commands from fixed arguments; do not interpolate untrusted strings into a shell.
AST05
MEDIUM
MCP server using network transport (SSE/HTTP)credits.json:77 · MCP server using network transport (SSE/HTTP) — data sent over network"licenseFile": "/home/runner/work/axe-mcp-server/axe-mcp-server/node_modules/.pnpm/@[email protected]/node_modules/@szmarczak/http-timer/LICENSE",Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
HIGH
navigator.sendBeacon()extension/datadog-logs.bundle.js:1 · navigator.sendBeacon() — can silently exfiltrate data…n){if(!!navigator.sendBeacon&&n.bytesCount<t)try{const t=e.build("beacon",n);if(navigator.sendBeacon(t,n.data))return}catch(e){!function(e){St||(St=!0,b(e))}(e)}wt(e,n)}let St=!1;fu…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
HIGH
document.cookie accessextension/background-datadog-logs.bundle.js:1 · document.cookie access — can steal session cookies…${o.domain}`:"",a=o&&o.secure?";secure":"",u=o&&o.partitioned?";partitioned":"";document.cookie=`${e}=${t};${s};path=/;samesite=${i}${c}${a}${u}`}function Sn(e){return functio…Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.
AST07
HIGH
navigator.sendBeacon()extension/vendor.bundle.js:2 · navigator.sendBeacon() — can silently exfiltrate data…,u._logErrorsOnEvents(r,o,0,c),u.removeEvents(r,o,0,c,{reason:e.message})}}else{navigator.sendBeacon(e,new URLSearchParams(l))?(this.removeEvents(r,o,200,"success"),this.options.sav…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
MCP server using network transport (SSE/HTTP)credits.json:97 · MCP server using network transport (SSE/HTTP) — data sent over network"licenseFile": "/home/runner/work/axe-mcp-server/axe-mcp-server/node_modules/.pnpm/@[email protected]/node_modules/@types/http-cache-semantics/LICENSE",Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
HIGH
document.cookie accessextension/datadog-logs.bundle.js:1 · document.cookie access — can steal session cookies…${o.domain}`:"",a=o&&o.secure?";secure":"",u=o&&o.partitioned?";partitioned":"";document.cookie=`${e}=${t};${s};path=/;samesite=${i}${c}${a}${u}`}function Sn(e){return functio…Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.
AST07
MEDIUM
File type combined with upload actioncredits.json:948 · File type combined with upload action — agent may exfiltrate local data files…pass@localhost:27017/dbname');\nconst keyv = new Keyv('sqlite://path/to/database.sqlite');\nconst keyv = new Keyv('postgresql://user:pass@localhost:5432/dbname');\nconst keyv = new Keyv('mysql://user:pass@localhost:3306/dbname');\nconst ke…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
HIGH
Base64 encoding combined with network callextension/vendor.bundle.js:2 · Base64 encoding combined with network call — potential data exfiltration…st o={credentials:"include",method:e.method,headers:n,body:r};try{const e=yield fetch(t,o);if(!e.ok)return null;return yield e.json()}catch(e){return null}})},3463(e,t){"use strict";const n=[{key:"devInstance",suffix:"DEV_INSTANCE",overrid…Fix: Put hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.
AST07
HIGH
Hidden zero-width characters detectedcredits.json:600 · Hidden zero-width characters detected — may conceal content…[email protected][email protected]/node_modules/express-rate-limit", "licenseText": " # MIT License\n\nCopyright 2023 Nathan Friedly, Vedant K\n\nPermission is hereby…Fix: Keep SKILL.md to visible, descriptive text. Remove comments and encoded text that address the agent.
AST07
HIGH
navigator.sendBeacon()extension/background-datadog-logs.bundle.js:1 · navigator.sendBeacon() — can silently exfiltrate data…n){if(!!navigator.sendBeacon&&n.bytesCount<t)try{const t=e.build("beacon",n);if(navigator.sendBeacon(t,n.data))return}catch(e){!function(e){St||(St=!0,b(e))}(e)}wt(e,n)}let St=!1;fu…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
MCP server using network transport (SSE/HTTP)credits.json:806 · MCP server using network transport (SSE/HTTP) — data sent over network"path": "/home/runner/work/axe-mcp-server/axe-mcp-server/node_modules/.pnpm/[email protected]/node_modules/http-errors",Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
HIGH
Auto-update or dynamic fetch configurationextension/vendor.bundle.js:2 · Auto-update or dynamic fetch configuration — agent may load new code at runtime…{NODE_ENV:"production",EDGE:"false",IS_AXE_PRO:"true",MANIFEST_VERSION:3,E2E:!1,HOT_RELOAD:"false",HOT_RELOAD_PORT:"8098",HOT_RELOAD_MODE:"full",DOCS_SITE_URL:"https://docs.deque.com/devtools-for-web",ISSUES_URL:"https://docs.deque.com/iss…Fix: Pin versions and sources; vendor anything fetched at install time.
AST06
MEDIUM
MCP server using network transport (SSE/HTTP)credits.json:95 · MCP server using network transport (SSE/HTTP) — data sent over network"path": "/home/runner/work/axe-mcp-server/axe-mcp-server/node_modules/.pnpm/@[email protected]/node_modules/@types/http-cache-semantics",Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
HIGH
document.cookie accessextension/vendor.bundle.js:2 · document.cookie access — can steal session cookies…typeof URL)return new URL(e).hostname||t}return t},Qe=function(e){try{for(var t=document.cookie.split(";"),n=null,r=0;r<t.length;r++){for(var o=t[r];" "===o.charAt(0);)o=o.sub…Fix: Replace encoded or assembled strings with plain literals and remove undeclared network calls.
AST07
MEDIUM
File type combined with upload actionextension/content.bundle.js:31 · File type combined with upload action — agent may exfiltrate local data files…sage:t})=>{const{features:n,vnodes:r}=t;Gt().Ay.setupTrees();const o=e();console.log("Debugging ML","\nLegend:\n - Green/Solid - The feature matched a programmatically identified element\n - Yellow/Dashed - The feature matched an element w…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
File type combined with upload actionextension/background-datadog-logs.bundle.js:1 · File type combined with upload action — agent may exfiltrate local data files…(e=>{s[e]=r[e]});const i="Datadog Browser SDK:",c={debug:s.debug.bind(r,i),log:s.log.bind(r,i),info:s.info.bind(r,i),warn:s.warn.bind(r,i),error:s.error.bind(r,i)},a="https://docs.datadoghq.com",u=`${a}/real_user_monitoring/browser/trouble…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
File type combined with upload actionextension/browser-polyfill.js:1 · File type combined with upload action — agent may exfiltrate local data files…inArgs:2,maxArgs:2}}};if(0===Object.keys(s).length)throw new Error("api-metadata.json has not been included in browser-polyfill");class g extends WeakMap{constructor(e,r=void 0){super(r),this.createItem=e}get(e){return this.has(e)||this.se…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
File type combined with upload actionextension/datadog-logs.bundle.js:1 · File type combined with upload action — agent may exfiltrate local data files…(e=>{s[e]=r[e]});const i="Datadog Browser SDK:",c={debug:s.debug.bind(r,i),log:s.log.bind(r,i),info:s.info.bind(r,i),warn:s.warn.bind(r,i),error:s.error.bind(r,i)},a="https://docs.datadoghq.com",u=`${a}/real_user_monitoring/browser/trouble…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
MCP server using network transport (SSE/HTTP)extension/vendor.bundle.js:2 · MCP server using network transport (SSE/HTTP) — data sent over network…ck",e.axeAssistantTeams="axe-assistant-teams",e.scimService="scim-service",e.axeMCPServer="axe-mcp-server"}(r||(t.ProductSlugs=r={}));const a=e=>"all"===e?"all":"active"===e||"active-only"===e?"active":{enterpriseId:e},s="none";t.DEFAULT_P…Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
MCP server using network transport (SSE/HTTP)extension/devtools.bundle.js:2 · MCP server using network transport (SSE/HTTP) — data sent over network…Date(r).getTime()/1e3));var r},x=async e=>{if(navigator.userAgent.includes("axe-mcp-server/"))return!1;const{enableOffline:t,dataGather:r,user:n,session:o}=await browser.storage.local.get(["enableOffline","dataGather","user","session"]);re…Fix: Namespace tool names and keep tool descriptions literal; no instructions to the agent inside them.
AST04
MEDIUM
File type combined with upload actionextension/content.bundle.js:61 · File type combined with upload action — agent may exfiltrate local data files…ate:new Set,destroy:new Set,update:new Set,walk:new Set,discard:new Set},this[y].json=[],this[y].dirty=!0,this.ready=!1,this.context=!1,this.rules={},this.vnodeIds={},this.reset(e)}setSeed(e){this[y].count=e,this.config.seed=e}use(e={}){co…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
File type combined with upload actionextension/vendor.bundle.js:2 · File type combined with upload action — agent may exfiltrate local data files…aders:n,body:r};try{const e=yield fetch(t,o);if(!e.ok)return null;return yield e.json()}catch(e){return null}})},3463(e,t){"use strict";const n=[{key:"devInstance",suffix:"DEV_INSTANCE",override:!0},{key:"loggedIn",suffix:"LOGGED_IN",overr…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07
MEDIUM
File type combined with upload actionextension/content.bundle.js:2 · File type combined with upload action — agent may exfiltrate local data files…end(n)}),Object.entries(r).forEach(([t,n])=>{e.length&&!e?.includes(t)||(console.log(`${t}: ${n.reduce((e,t)=>e+t)}ms total (${n.length}x)`),delete r[t])})}}}),c=n.cw((e,t)=>{t.serialError=void 0,t.serialError=function e(t,n=0){if("object"…Fix: Remove the call, or declare the host in frontmatter and explain in the README what is sent and why.
AST07

Cost to the agent

Instructions loaded
≈58 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 axe-mcp-server@1.8.0 as of 3d ago. This is the package itself, not its dependencies.

What would make this Verified

10 points to 80 · weights: behavior 45%, static 25%, prompt 15%, publisher 15%
  1. Unclaimed publisher≈ +8 on the totalClaim dequelabs: a verified publisher gets +50 on publisher trust. It is free and usually instant with GitHub sign-in.
  2. Obfuscated code≈ +5 on the totalRemove base64-assembled strings, eval of decoded text and minified blobs. Reviewers and scanners both treat unreadable code as hostile.
  3. navigator.sendBeacon()≈ +4 on the totalRemove the call, or declare the host in frontmatter and explain in the README what is sent and why.
  4. document.cookie access≈ +4 on the totalReplace encoded or assembled strings with plain literals and remove undeclared network calls.
  5. Base64 encoding combined with network call≈ +4 on the totalPut hosts, commands and strings in plain source. Decoding at runtime looks identical to malware and costs points on its own.
  6. Hidden zero-width characters detected≈ +4 on the totalKeep SKILL.md to visible, descriptive text. Remove comments and encoded text that address the agent.
Publish a new version to npm, then queue it here. Not your skill? Claim the handle to get verdict changes by email.Claim dequelabsPropose a patch to the maintainer