Pocketbase Jsvm

What it does

When your agent uses it

• Pbmigrations JS
• Server-side PocketBase extensions — not the npm JS SDK

Example prompts

• “Use the pocketbase-jsvm skill to write PocketBase server-side JavaScript in the Goja JSVM: pbhooks, routerAdd, record hooks, cron jobs, and…”
• “/pocketbase-jsvm”

Requirements

• Docker

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

1. 1Shared hook logic lives in packages/pockethost/src/common/ — must be JSVM-safe (sync, no Node/browser APIs).
2. 2Import via $common/ subpaths (tsconfig "$common/*": ["../common/*"]). Avoid runtime imports from the $common barrel.
3. 3After build, confirm no [UNRESOLVED_IMPORT] warnings — unresolved imports break validation silently at runtime.

What it can do on your machine

Read from SKILL.md and the folder at commit 82c9ba3. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • git

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • pocketbase.io

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Pocketbase Jsvm loads about 2.7k tokens when it runs. Until then it costs about 134 tokens; SKILL.md has 775 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~134

When it runs · the whole SKILL.md, loaded when a task matches

~2.7k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from pockethost/pockethost at commit 82c9ba3, republished under its MIT licence (© pockethost). 775 words, ~2,724 tokens.

name

pocketbase-jsvm

description

Writes PocketBase server-side JavaScript in the Goja JSVM: pb_hooks, routerAdd, record hooks, cron jobs, and synchronous $app APIs. Use for *.pb.js files, pb_hooks, pb_migrations JS, or server-side PocketBase extensions — not the npm JS SDK. Read quirks.md for Goja gotchas (toString, json fields, hoisting, BadRequestError). Always check target PocketBase version: v0.22 and v0.23+ use different JSVM APIs and docs. PocketBase watches pb_hooks JS on disk and hot-reloads hooks inside the running process without exiting.

pb_hooks/
├── main.pb.js          # auto-loaded entry hooks
├── config/
│   └── config.js       # shared module (require target)
└── posts.create.pb.js

const config = require(`${__hooks}/config/config.js`)

onRecordAfterCreateRequest((e) => {
  const record = e.record
  // ...
}, 'users')

routerAdd('POST', '/test/:testId', (c) => {
  const testId = c.pathParam('testId')
  return c.json(200, { testId })
})

routerAdd('POST', '/test/{testId}', (e) => {
  const testId = e.request.pathValue('testId')
  return e.json(200, { testId })
})

routerAdd('PUT', '/api/instance/:id', (c) => {
  return require(`${__hooks}/mothership`).HandleInstanceUpdate(c)
}, $apis.requireRecordAuth())

let data = new DynamicModel({ trusted_ips: [] })
e.bindBody(data)
data = JSON.parse(JSON.stringify(data)) // required before destructuring / $common validators
const { trusted_ips } = data

const body = $apis.requestInfo(c).data

routerAdd('PATCH', '/posts/{postId}', (e) => {
  const postId = e.request.pathValue('postId')
  let data = new DynamicModel({ status: '' })
  e.bindBody(data)
  data = JSON.parse(JSON.stringify(data))

  const record = $app.findRecordById('posts', postId)
  record.set('status', data.status)
  $app.save(record)

  return e.json(200, { record })
})

routerAdd('PATCH', '/posts/:postId', (c) => {
  const postId = c.pathParam('postId')
  const { status } = $apis.requestInfo(c).data

  const record = $app.dao().findRecordById('posts', postId)
  record.set('status', status)
  $app.dao().saveRecord(record)

  return c.json(200, { record })
})

$app.db().newQuery('SELECT * FROM posts WHERE id = {:id}')
  .bind({ id: postId })
  .one()

const res = $http.send({
  url: 'https://api.example.com/webhook',
  method: 'POST',
  body: { email: record.get('email') },
  headers: { Authorization: 'Bearer ...' },
})

const value = process.env.MY_SECRET || ''

// pb_hooks/utils.js
module.exports = {
  mkLog: (ns) => (...args) => console.log(`[${ns}]`, ...args),
}

// pb_hooks/main.pb.js
const { mkLog } = require(`${__hooks}/utils.js`)
const log = mkLog('main')

// ✅ validateSshKey.ts — subpath bundles sshPublicKey.ts only
import { parseSshEd25519PublicKey } from '$common/sshPublicKey'

// ❌ tsdown won't resolve without tsconfig path
import { parseSshEd25519PublicKey } from 'pockethost/common'

// ❌ pulls unrelated common modules into pb_hooks
import { parseSshEd25519PublicKey } from '$common'

© pockethost, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 6 other files in .cursor/skills/pocketbase-jsvm of pockethost/pockethost.

• SKILL.md
• app-store.md
• constraints.md
• hooks-examples.md
• quirks.md
• request-body.md
• v023-upgrade.md

Open the folder on GitHubat commit 82c9ba3