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Bart for AI agents

BART's API provides real-time Bay Area Rapid Transit data, including train departures, service alerts, fares, and station information, used by apps that help riders plan trips. 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 BartSee the 20 actions ↓
Developer toolsAPI keyMCP + RESTbart.gov
AUDIT LOG · BARTPOLICY: acme-support
09:41:07 · claude · u_8f2read
bart.list_routes
List BART Routes✓ allowed · 212ms
09:41:08 · claude · u_8f2read
bart.get_fare
Get BART Fare✓ allowed · 164ms
EVERY BART CALL, ON THE RECORD
01 · USE CASES

What agents do in Bart.

01

Check next train departures

Get estimated departures for a station so a rider knows when the next train actually arrives.

02

Check for service alerts

Get current service advisories and elevator status for a station before telling a rider to expect delays.

03

Look up a fare between stations

Get the fare between two stations to answer a rider's question, a read-only lookup with no booking involved.

02 · ACTIONS

20 Bart actions, graded by risk.

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

read

20

Look things up. Allowed by default.

  • bart.get_fare
    Get BART Fare
  • bart.list_routes
    List BART Routes
  • bart.get_stations
    Get BART Stations
  • bart.get_route_info
    Get Route Info
  • bart.get_api_version
    Get BART API Version
  • bart.get_gtfs_alerts
    Get GTFS-RT Service Alerts
  • bart.get_train_count
    Get Train Count
  • bart.get_station_info
    Get Station Info
  • bart.get_route_schedule
    Get Route Schedule
  • bart.get_station_access
    Get Station Access
  • bart.get_elevator_status
    Get Elevator Status
  • bart.get_schedule_arrive
    Get BART Schedule Arrive
  • bart.get_schedule_depart
    Get BART Schedule Depart
  • bart.get_station_schedule
    Get Station Schedule
  • bart.get_special_schedules
    Get Special Schedules
  • bart.get_service_advisories
    Get Service Advisories
+ 4 MORE

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

Bart in three steps.

  1. 01Your users connect BartThey add their Bart 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 Bart 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('bart', {
  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 Bart connects.

Users add their Bart 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 Bart 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 Bart from any agent.

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

More developer tools apps.

GitHub896 actionsSupabase129 actions0CodeKit8 actionsAbly25 actionsAbstract3 actionsAddressfinder17 actionsAddresszen2 actionsAlchemy36 actions
ALL DEVELOPER TOOLS APPS →
07 · FAQ

Bart and Arc0, answered.

Q01

Can I use Bart with Claude, ChatGPT or Cursor?

Yes. Connect Bart 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 Bart actions you allow.

Q02

How do users connect Bart?

Users add their Bart 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 Bart actions can my agent take?

20 in total: 20 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 Bart?

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

Q05

Can my own backend call Bart too?

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

Get started

Plug Bart into your agent.

Your users connect Bart once, under your brand. Your agent gets 20 actions behind your policies, with every call on the record.

Connect BartBrowse all apps →

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