Sales & CRM·v2.9.0

HubSpot Product Event Sync Agent Skill

Sync backend product events into HubSpot contact and company custom properties using idempotent batched updates — the Segment integration…

Context cost
15.8k tokensestimated from the bundle, loaded when it triggers
Bundle
4 files · 63.3 kBtext throughout, nothing executable
Licence
MITthe author’s own terms
Last change
—v2.9.0
Servers it uses
Noneruns standalone

What it does

Sync backend product events into HubSpot contact and company custom properties using idempotent batched updates — the Segment integration pattern without Segment. Use when you need to push server-side behavioral signals (feature usage, session counts, last-seen timestamps, trial milestones) into HubSpot CRM properties so sales and marketing can act on product data without a CDP in the stack. Trigger with "hubspot product events", "sync events to hubspot", "hubspot custom properties", "hubspot event pipeline", "hubspot segment alternative", "push usage data to hubspot".

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

event-synchubspotintegration-engineeringmarketingproduct-analytics
Filed under

Sales & CRM

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md22.5 kB · preview
--- name: hubspot-product-event-sync allowed-tools: Read, Write, Edit, Bash(curl:*), Bash(jq:*), Bash(python3:*), Grep version: 2.9.0 license: MIT author: Jeremy Longshore <jeremy@intentsolutions.io> compatibility: Designed for Claude Code tags: - hubspot - product-analytics - event-sync - integration-engineering ---
23# HubSpot Product Event Sync
24
25## Overview
26
27Push backend product events into HubSpot custom contact and company properties — the core pattern of a Segment-style integration, built directly against the HubSpot CRM API without a CDP middleman. This is not a tutorial on HubSpot setup. It is the code your data pipeline runs at 3am when a product launch generates a 10K events/minute storm, when a network hiccup causes the same batch to be retried and your "total sessions" counter doubles, when a property type mismatch silently truncates numbers, and when your contact lookup fails because a new user signed up ten seconds ago and HubSpot doesn't have them yet.
28
29The six production failures this skill prevents:
30
311. **Non-idempotent updates** — the same event processed twice (retry after network failure) increments a counter twice. "Last seen" survives duplication; "total sessions" does not. Idempotency keys must be event-level, not request-level.
322. **Property type mismatch** — writing a number to a HubSpot string property returns HTTP 200 with the value coerced silently. The stored data is wrong; no error surfaces. Validate property types before writing.
333. **Rate-limit burnout from event storms** — a product launch generates 10K events/minute. Naive sync exhausts the 100 req/10s burst budget in under two seconds. A token-bucket queue is non-optional.
344. **Contact not found** — the product event carries an email that HubSpot does not have yet. The batch update silently drops the record. Upsert-by-email or auto-create is the correct path.
355. **Batch partial failure (207 Multi-Status)** — POST /crm/v3/objects/contacts/batch/update returns 207 when some records succeed and others fail. Treating 207 as success causes silent data loss at scale. Parse the per-object errors array.
366. **Custom event vs custom property confusion** — HubSpot has two different systems: custom behavioral events (Marketing Hub Enterprise, timeline-visible) and custom contact/company properties (available on all tiers, stored as structured data on the record). Using the wrong mechanism for the use case leads to wrong attribution, missing data, or a surprise $3K/month plan upgrade.
37
38## Prerequisites
39
40- Node.js 18+ or Python 3.10+
41- HubSpot private app token with scopes: crm.objects.contacts.read, crm.objects.contacts.write, crm.objects.companies.read, crm.objects.companies.write, crm.schemas.contacts.read, crm.schemas.contacts.write
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md2,892 words
Files4
LicenceMIT
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈230
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
15,595
on trigger
The instruction body and 3 supporting files, read only when the skill fires.
7.9%
of a 200k window
Ten skills this size would take about 79% of the window before you open a file.
050k100k150k200k context window

15.8k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

It asks the agent to write files, using whatever file access your client already has. Whether it reaches the network is not declared.

What it asks for
Writes filesyes
Network accessnot declared

Read from the allowed-tools line of this skill’s own SKILL.md. It also asks for Bash, which could do either, so what is not named there is not ruled out. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

4 files, 63.3 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md22.5 kB
  • references/API_REFERENCE.md12.6 kB
  • references/event-queue-implementation.md2.5 kB
  • references/implementation-guide.md25.7 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 4 files you can review in full before installing. The MIT licence covers the templates and examples as well as the instructions.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# HubSpot Product Event Sync · 15.8k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/hubspot-product-event-sync/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/hubspot-product-event-sync" ] && { [ ! -e .claude/skills/hubspot-product-event-sync ] || { mv .claude/skills/hubspot-product-event-sync "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/hubspot-product-event-sync" .claude/skills/ && echo "Installed .claude/skills/hubspot-product-event-sync"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add jeremylongshore/hubspot-product-event-sync

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/hubspot-product-event-sync/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/hubspot-product-event-sync/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/hubspot-product-event-sync" ] && { [ ! -e ~/.claude/skills/hubspot-product-event-sync ] || { mv ~/.claude/skills/hubspot-product-event-sync "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/hubspot-product-event-sync" ~/.claude/skills/ && echo "Installed ~/.claude/skills/hubspot-product-event-sync" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/hubspot-product-event-sync/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Version2.9.0
Publishedno release date on file
PriceFree
Referencejeremylongshore/hubspot-product-event-sync

Versions

v2.9.0 is what is on the shelf; no release here carries a date. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

v2.9.0
  • No earlier releases have been published to the marketplace.
Pinning

The install command always fetches the release that is current the day you run it — v2.9.0 today — and cannot ask for an earlier one. The copy on your disk does not change until you run it again.

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