Grades are a hygiene check, not a security guarantee.

MCP, MCP server

ONCE Exactly-Once Reliability for AI Agent Actions

ONCE Exactly-Once Reliability for AI Agent Actions, an MCP server listed in the PlugVet directory.

Compatibility: Not stated.

Grade C

One Medium finding. Read the findings before installing.

Graded by PlugVetRubric v2

Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.

Rescanned at commit d12355acb010, unchanged since the check below.

OBFUSCATION_MINIFIED_PAYLOAD

Why this grade

  • OBFUSCATION_MINIFIED_PAYLOAD Medium

    Contains a very long line with almost no spaces in a script or style file.

    src/activity.js, line 55 record(req,{kind,status=200,result=null,clientInfo=null}={}){const caller=this.caller(req);if(clientInfo?.name)this.clientInfo.set(caller,{name:safe(clientInfo.name,80),version:saf

Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.

Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.

What was checked

Plain notes from the hygiene checks.

  • Permissions

    Concern

    can delete files.

    PERMISSION_DELETE_FILES

    src/auth.js, line 10

    wait handle.close().catch(()=>{});await fs.unlink(lockFile).catch(()=>{})}}catch(err){if(e

    src/once.js, line 84

    await fs.unlink(lockFile).catch(() => {});

    src/once.js, line 102

    await fs.unlink(lockFile).catch(() => {});

  • Install and update

    Pass

    No install-time script found, and dependencies are pinned or absent.

  • Network

    Concern

    can reach a host that is not written as a fixed address.

    NETWORK_NO_FIXED_HOST

    scripts/live-smoke.js, line 4

    for(let i=0;i<2;i++){const r=await fetch(`${base}/v1/demo`,{method:'POST',headers

    src/net.js, line 27

    return async (url, options={}) => { await assertSafeUrl(url,{allowPrivate}); return fetch(url,{...options,redirect:'error'}); };

    docs/AGENT-INTEGRATIONS.md, line 24

    const result = await fetch(`${base}/v1/once`, {

  • Secrets

    Note

    reads an environment variable.

    SECRETS_ENV_READ

    src/activity.js, line 50

    nfo=new Map();this.secret=callerSecret||process.env.ONCE_CALLER_HMAC_SECRET||null;if(this.file)this.load();if(!this

  • Agent instructions

    Pass

    No instruction to ignore earlier instructions or to hide a step.

  • Obfuscation

    Concern

    contains a minified payload.

    OBFUSCATION_MINIFIED_PAYLOAD

    src/activity.js, line 55

    record(req,{kind,status=200,result=null,clientInfo=null}={}){const caller=this.caller(req);if(clientInfo?.name)this.clientInfo.set(caller,{name:safe(clientInfo.name,80),version:saf

    src/activity.js, line 56

    snapshot(){const now=new Date().toISOString(),today=easternDay(now),external=this.events.filter(e=>e.external),todays=external.filter(e=>easternDay(e.at)===today),credible=external

    src/auth.js, line 14

    export class FileUsageMeter{constructor({dataDir=process.env.ONCE_DATA_DIR??path.resolve('.once-data')}={}){this.usageDir=path.join(dataDir,'usage');this.lock=new FileLock({locksDi

  • Licence

    Note

    no licence file found.

    LICENCE_MISSING

    No file path was stored.

    no licence file found.

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

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Note

Hygiene check of commit d12355acb010. can delete files. can reach a host that is not written as a fixed address. reads an environment variable. contains a minified payload. no licence file found.

Date and source

Date checked:

View source

github.com

Commit graded: d12355acb010becd95fa52f0cb37b07b6c1067ae

This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.

Read how this letter is chosen