Get started

Bread & Butter for AI agents

Bread & Butter is a lead intelligence platform that marketing teams use to identify website visitors, track attribution, and review lead activity. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect Bread & ButterSee the 8 actions ↓
MarketingAPI keyMCP + RESTbreadandbutter.io
AUDIT LOG · BREAD & BUTTERPOLICY: acme-support
09:41:07 · claude · u_8f2read
bread_and_butter.list_leads
List Leads✓ allowed · 212ms
09:41:08 · claude · u_8f2read
bread_and_butter.list_events
List Events✓ allowed · 164ms
EVERY BREAD & BUTTER CALL, ON THE RECORD
01 · USE CASES

What agents do in Bread & Butter.

01

Look up a visitor's profile

Read-only pull of a website visitor's identity and insights before deciding whether to reach out.

02

Check attribution for a lead

Pull the attribution report for a lead list to see which channel drove a conversion.

03

Review event definitions before analysis

List the event definitions and recent events tracked for an application before building a report.

02 · ACTIONS

8 Bread & Butter actions, graded by risk.

Every Bread & Butter action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

8

Look things up. Allowed by default.

  • bread_and_butter.list_leads
    List Leads
  • bread_and_butter.list_events
    List Events
  • bread_and_butter.get_application
    Get Application
  • bread_and_butter.list_lead_lists
    List Lead Lists
  • bread_and_butter.get_user_insights
    Get User Insights
  • bread_and_butter.list_applications
    List Applications
  • bread_and_butter.get_attribution_report
    Get Attribution Report
  • bread_and_butter.list_event_definitions
    List Event Definitions

write

0

Create and change things. Allow, or ask the user first.

  • No write actions.

destructive

0

Delete, cancel or archive. Ask first, or deny outright.

  • No destructive actions.
03 · HOW IT WORKS

Bread & Butter in three steps.

  1. 01Your users connect Bread & ButterThey add their Bread & Butter api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, and writes like “updates” can wait for the user to approve.
  3. 03Any agent can actYour agent calls Bread & Butter through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
POLICY.TS
await arc0.policies.set('bread_and_butter', {
  read: 'allow',
  write: 'ask',        
  destructive: 'deny',  
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2
04 · AUTH AND DATA

How Bread & Butter connects.

Users add their Bread & Butter api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same Bread & Butter connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH
API key
CREDENTIALS
Per-tenant encrypted vault
MODEL SEES
Results only, never credentials
AUDIT LOG
Every call, on every plan
05 · WORKS WITH

Use Bread & Butter from any agent.

Claude
ChatGPT
Cursor
Codex
VS Code
OpenAI Agents SDK
Claude Agent SDK
Vercel AI SDK
Mastra
LangGraph
06 · RELATED

More marketing apps.

Meta Ads67 actionsActiveCampaign298 actionsActiveTrail159 actionsAdobe Marketing Agent12 actionsAdtraction22 actionsAdyntel8 actionsAhrefs40 actionsAirOps96 actions
ALL MARKETING APPS →
07 · FAQ

Bread & Butter and Arc0, answered.

Q01

Can I use Bread & Butter with Claude, ChatGPT or Cursor?

Yes. Connect Bread & Butter to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Bread & Butter actions you allow.

Q02

How do users connect Bread & Butter?

Users add their Bread & Butter api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which Bread & Butter actions can my agent take?

8 in total: 8 read, 0 write and 0 destructive. Your policies decide which of them each agent may call.

Q04

Can I make my agent read-only in Bread & Butter?

Yes. Allow read actions and deny writes in the Bread & Butter policy. Your agent can still look things up, and any write it attempts is blocked and logged.

Q05

Can my own backend call Bread & Butter too?

Yes. The same Bread & Butter connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Bread & Butter into your agent.

Your users connect Bread & Butter once, under your brand. Your agent gets 8 actions behind your policies, with every call on the record.

Connect Bread & ButterBrowse all apps →

Free to build · MCP + REST · Audit log on every plan