Hanzo AI for HubSpot

Brings Hanzo AI into a sales, marketing, or customer-success team's HubSpot CRM. Open the Hanzo AI tab on any contact, company, or deal record and Hanzo will:

• Summarize this record — read the record and its associated records (a contact's companies + deals, a deal's contacts + companies, …) and produce a tight, rep-ready overview.
• Draft email — generate a short, personalized follow-up grounded in the record data, ready to send.
• Next steps — a prioritized list of concrete actions for this record.
• Ask — freeform Q&A over the record and its context.

Every result can be written back to HubSpot with one click — logged as a Note or created as a follow-up Task on the record, associated via the platform's default engagement association. Model calls route through the same api.hanzo.ai/v1 gateway as every other Hanzo surface, using the published @hanzo/ai headless client.

This is a HubSpot public app on the developer-projects platform: a CRM card UI extension (React) backed by serverless functions. The Hanzo API key and the per-portal OAuth token live only in the serverless backend — they never reach the browser.

Architecture

Two credentials, kept apart by design:

• HubSpot — OAuth 2.0 authorization-code grant. The client_secret lives only in the app's OAuth exchange (see src/oauth.ts for the exact wire shape); the resulting per-portal access token is injected by HubSpot into the serverless runtime as process.env.PRIVATE_APP_ACCESS_TOKEN. The React card never sees it — it reads/writes CRM data only by calling the serverless functions.
• Hanzo — an hk-… API key stored as a HubSpot secret (HANZO_API_KEY), read by the hanzo-assistant serverless function and passed to @hanzo/ai. The browser only ever receives the final generated text.

CRM card (HanzoAssistant.tsx, React, no window/fetch)
   │  runServerlessFunction('hanzo-assistant', { objectType, objectId, action, detail, model })
   ▼
app.functions/hanzo-assistant.js   (holds HANZO_API_KEY; OAuth token from env)
   ├── @hubspot/api-client  ── read record + associations (getById, associations.v4, batch.read)
   ├── @hanzo/hubspot (pure core) ── buildContextBlocks → assembleRecordContext (windowed)
   └── @hanzo/ai  createAiClient ── POST api.hanzo.ai/v1/chat/completions
   ◀── { text, truncated }

CRM card ── runServerlessFunction('hanzo-writeback', { kind, objectType, objectId, body })
   ▼
app.functions/hanzo-writeback.js
   └── noteWriteBack / taskWriteBack (pure) → POST /crm/v3/objects/{notes,tasks}

The pure core (src/config.ts, src/hanzo.ts, src/oauth.ts, src/record.ts, src/api/*) has no HubSpot runtime and no DOM dependency — it is the @hanzo/hubspot package the serverless functions import, and it is covered by the vitest suite. The .tsx card and the .js serverless functions are the two thin edges HubSpot's own tooling bundles and runs.

Layout

src/
  config.ts            Hanzo + HubSpot endpoints, object types, context budget
  hanzo.ts             the single model path (over @hanzo/ai) + context windowing + the 4 actions
  oauth.ts             HubSpot OAuth token-exchange request shaping
  record.ts            CRM record → ordered model-context blocks (property + association selection)
  api/
    hubspot-api.ts     CRM v3 request shaping + response parsing (getObject, getAssociations, …)
    write-back.ts      Note / Task engagement payload assembly (default association edges)
  index.ts             the pure public surface (what the serverless functions import)
  app/
    public-app.json    the public app: name, OAuth (scopes + redirect), card reference
    extensions/
      hanzo-assistant-card.json   the CRM card config (crm.record.tab, objectTypes)
      HanzoAssistant.tsx          the React UI extension
    app.functions/
      serverless.json             function → file + secrets map
      hanzo-assistant.js          reads record, runs the model (holds HANZO_API_KEY)
      hanzo-writeback.js          creates the Note / Task engagement
hsproject.json         project name, srcDir, platformVersion (2025.1)
assets/                app-listing icons (16/32/128)

Setup

1. Create a HubSpot developer account + app

1. Sign up for a free HubSpot developer account at https://developers.hubspot.com/ and create a test account (sandbox) to install into.

2. Install the HubSpot CLI and authenticate:

   npm i -g @hubspot/cli
   hs init            # writes hubspot.config.yml, authenticates an account
   hs account list    # confirm your test account is connected

2. Configure OAuth

The app declares OAuth in src/app/public-app.json:

• Redirect URL — https://hubspot.hanzo.ai/oauth/callback. Change this to your own HTTPS callback that runs the token exchange (src/oauth.ts tokenExchange → parseTokenResponse).

• Required scopes — read + write on the three object types the card mounts on:

  crm.objects.contacts.read   crm.objects.contacts.write
  crm.objects.companies.read  crm.objects.companies.write
  crm.objects.deals.read      crm.objects.deals.write

  Read powers Summarize / Draft / Next steps / Ask; write powers the Note / Task write-back.

The install flow: send the user to authorizeUrl(...) (built in src/oauth.ts), HubSpot redirects back to your callback with ?code=…&state=…, you POST the tokenExchange request to https://api.hubapi.com/oauth/v1/token, and store the returned token set. HubSpot then makes the per-portal token available to the serverless functions.

3. Set the Hanzo key as a secret

The model key never goes in source or in the browser — it is a HubSpot secret:

hs secret add HANZO_API_KEY        # paste your hk-… key from hanzo.id

serverless.json declares HANZO_API_KEY on the hanzo-assistant function, so HubSpot injects it as process.env.HANZO_API_KEY at runtime.

4. Upload + deploy

cd packages/hubspot
hs project upload      # builds and uploads the project (creates a build)
hs project deploy      # deploys the latest build to make the app live
# iterate with a live reload while developing:
hs project dev

hs project dev runs the card locally against your test account (records show a "Developing locally" tag). To point hubspot.fetch/serverless calls at a local backend during development, use a local.json proxy.

5. Install the card on record pages

1. Install the app into your test account from the app's install URL (the OAuth consent flow above).
2. Open any contact, company, or deal record.
3. The Hanzo AI card appears as a tab (crm.record.tab). Add it to the record's default view via Customize record if it isn't shown.

6. Use it

Pick a model (the picker is populated from /v1/models via the serverless proxy; defaults to zen5), choose an action, and run. For Draft email and Ask, type the topic / question first. Review the output, then Save as Note or Create Task to write it back to the record.

App Marketplace

To list publicly on the HubSpot App Marketplace:

1. Complete the app's listing in the developer portal (name, description, the icons in assets/, screenshots, support info).
2. Ensure the app requests only the scopes it uses (the six above) and has a production OAuth redirect and install flow.
3. Submit for review at https://developers.hubspot.com/docs/guides/apps/marketplace/listing-your-app. Marketplace apps must use oauth auth (already the case here).

Development

pnpm --filter @hanzo/hubspot test        # vitest — the pure core
pnpm --filter @hanzo/hubspot typecheck   # tsc --noEmit over src + tests
pnpm --filter @hanzo/hubspot build       # emit dist/ (ESM + CJS) for the serverless import

The tests are pure (no network): CRM request shaping + parsing, OAuth token-exchange shaping, record-context assembly/truncation, the @hanzo/ai request shaping (over an injected client), and the Note/Task write-back payloads.