Early access

Trestle MCP server

Name: Arc0 for Trestle
Author: Arc0

Validate a phone number or retrieve caller information for a permitted purpose, with each lookup scoped to the supplied number. Access is gated: request enablement for your organization before connecting.

Request early access See 5 actions ↓

SalesAPI keyMCP + RESTtrestleiq.com

AUDIT LOG · TRESTLEPOLICY: acme-support

09:41:07 · claude · u_8f2read

trestle.caller_id

Identify the top phone owner✓ allowed · 212ms

09:41:08 · claude · u_8f2read

trestle.smart_cnam

Look up a caller name✓ allowed · 164ms

ILLUSTRATIVE POLICY TRACE · NOT A LIVE RECEIPT

01 · USE CASES

Agent workflows for Trestle.

Validate a phone number

Use when checking one phone for validity, carrier, line type and activity. Personal data: callers need a permissible purpose; not for eligibility decisions. Paid lookup; a timed-out call may still be charged.

Identify the top phone owner

Use when identifying the highest-ranked owner of one phone number. Returns personal data; callers need a permissible purpose. Not for eligibility decisions. Paid lookup; a timed-out call may still be charged.

Look up a caller name

Use when only the top caller name for one phone is needed. Returns personal data; callers need a permissible purpose. Not for eligibility decisions. Paid lookup; confirm plan pricing. A timed-out call may still be charged.

02 · ACTIONS

5 Trestle actions, graded by risk.

These actions come from the Arc0 registry. Your identity, provider permissions and Arc0 policies determine which actions can run.

read

Look things up, subject to your permissions.

trestle.validate_phone
Validate a phone number
Use when checking one phone for validity, carrier, line type and activity. Personal data: callers need a permissible purpose; not for eligibility decisions. Paid lookup; a timed-out call may still be charged.
trestle.caller_id
Identify the top phone owner
Use when identifying the highest-ranked owner of one phone number. Returns personal data; callers need a permissible purpose. Not for eligibility decisions. Paid lookup; a timed-out call may still be charged.
trestle.smart_cnam
Look up a caller name
Use when only the top caller name for one phone is needed. Returns personal data; callers need a permissible purpose. Not for eligibility decisions. Paid lookup; confirm plan pricing. A timed-out call may still be charged.
trestle.reverse_phone
Look up phone owners
Use when resolving possible owners of one exact phone number. Returns up to 10 personal identity summaries; callers need a permissible purpose. Not for eligibility decisions. Paid lookup; a timed-out call may still be charged.
trestle.real_contact
Verify contact consistency
Use when checking a supplied name against one phone and optional email, with contact grades. Personal data: callers need a permissible purpose; not for eligibility decisions. Paid lookup; a timed-out call may still be charged.

write

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

No write actions.

destructive

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

No destructive actions.

03 · POLICIES AND AUDIT

Control access to Trestle.

After early access is enabled, connect the intended Trestle account, authorize your AI client and set policies for its tools.

Provider permissions and Arc0 policy both apply. Allow reads, require approval for selected writes, or deny destructive actions. The audit log records execution decisions.

Configure policies and approvals

Example policy choices

Read actions: allow where authorized

Arc0 MCP endpoint: https://api.arc0.ai/mcp

04 · AUTH AND DATA

How Trestle connects.

Connect Trestle using API key. OAuth grants the provider scopes shown during consent; API keys and other credentials retain the permissions configured at the provider. Arc0 stores credentials in its encrypted vault and does not pass them to the model. Disconnect to remove access through Arc0; revoke a key at the provider to invalidate it there. Token refresh and provider-side revocation depend on the authentication lane and provider.

The connection serves authorized calls through Arc0 MCP and REST. 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 · AI CLIENTS

Use Trestle with your AI client.

Request access to Trestle first. An Arc0 administrator must enable it for your organization before these actions appear. Then authorize your AI client separately. It only receives tools and accounts allowed for that identity.

Trestle with Claude

Claude Desktop + Claude Code

In Claude Desktop, add Arc0 through the remote MCP settings and use OAuth. Follow the generic remote-client steps if your account’s interface differs.
For Claude Code, run the command below. Open /mcp, select Arc0, and authenticate in your browser. Select your workspace and review access.
Check the connection with claude mcp get arc0.

claude mcp add --transport http --scope user arc0 https://api.arc0.ai/mcp

Full MCP setup and troubleshooting

All apps for Claude

Trestle with ChatGPT

ChatGPT on the web

Open Plugins in ChatGPT, select the plus button, then Add custom MCP server.
Name it Arc0, enter the server URL below, and choose OAuth. Use dynamic client registration if asked; no Arc0 API key is needed.
Review the notice and select Create as a plugin. Complete Arc0 sign-in, workspace selection and consent, then install and select the plugin in your conversation. Labels and access vary by account; managed workspaces may require administrator approval.

https://api.arc0.ai/mcp

Full MCP setup and troubleshooting

All apps for ChatGPT

Trestle with OpenAI Codex

Codex app + CLI

Run the registration command below. The app and CLI share ~/.codex/config.toml.
Complete browser OAuth, choose your Arc0 workspace, and review access. If authentication does not start, run codex mcp login arc0.
Check codex mcp list, then open a new Codex chat. Inspect an existing arc0 entry before changing it.

codex mcp add arc0 --url https://api.arc0.ai/mcp

Full MCP setup and troubleshooting

All apps for OpenAI Codex

Trestle with Cursor

Remote MCP setup

Add Arc0 in your client’s remote MCP settings using the server URL below.
Choose OAuth, sign in to Arc0, select the intended workspace and review access.
Confirm the server is connected and start with an allowed read. These are generic remote-MCP steps; consult your client’s settings for its current interface.

https://api.arc0.ai/mcp

Full MCP setup and troubleshooting

All apps for Cursor

Trestle with VS Code

Remote MCP setup

Add a remote HTTP MCP server named Arc0 using the URL below.
Use OAuth and finish Arc0 sign-in, workspace selection and consent.
Confirm discovery succeeds before requesting a read. These are generic remote-MCP steps; client UI and availability may differ.

https://api.arc0.ai/mcp

Full MCP setup and troubleshooting

Trestle with Any MCP client

Streamable HTTP

Use a client that supports remote MCP over Streamable HTTP. Add the server URL below and choose OAuth.
For a client without OAuth, use a self-bound API key with execute permission in the X-API-Key header. Store it in secret storage or an environment variable, outside source control. Never send both an API key and an OAuth bearer token.
Use the MCP clients guide for the SDK transport example and Embedded identity for business-managed end users.

https://api.arc0.ai/mcp

Full MCP setup and troubleshooting

After setup, ask your agent to find an allowed read action, load its schema, and execute it on the intended account. Check Activity for the receipt. A connected MCP client alone does not confirm a successful provider call.

06 · RELATED

More sales apps.

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SmartleadComing soon

ALL SALES APPS →

07 · FAQ

Trestle and Arc0, answered.

Q01

Does Trestle work with Claude Desktop and Claude Code?

Yes, after early access is enabled for your organization and you connect the intended account. Use Arc0’s remote MCP endpoint with OAuth. Claude Code has a documented registration command; Desktop uses the generic remote-client setup.

Q02

Can I use Trestle with OpenAI Codex, ChatGPT and Cursor?

Yes, after early access is enabled for your organization and you connect the intended account. Codex and ChatGPT have setup instructions in Arc0’s MCP clients guide. Cursor uses the generic remote-MCP steps. Tool access remains scoped to the authorized identity.

Q03

Is this the official Trestle MCP server?

This is Arc0’s integration page, not a claim of an official Trestle server. Arc0 adds a shared connection, policy and audit experience across apps. Consult Trestle for its own current MCP offerings.

Q04

Which Trestle actions are supported?

5 registry-defined actions: 5 read, 0 write and 0 destructive. Provider permissions, access enablement and Arc0 policy determine what can execute.

Q05

Which permissions does Trestle need?

Q06

Can I restrict writes in Trestle?

You can deny write and destructive actions or require approval. Provider scopes and Arc0 action policies are separate controls; a policy does not grant additional provider permissions.

Q07

What does Trestle through Arc0 cost?

See Arc0 pricing for current connectivity plans. The provider may require its own subscription or charge per request. Arc0 plan allowances do not make third-party data or paid actions free.

Get started

Request Trestle access.

Trestle MCP server: 5 actions including validate a phone number, identify the top phone owner, look up a caller name. Request early access through Arc0.

Request early access Browse all apps →

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

Trestle and its logo are trademarks of their respective owners. Arc0 is not affiliated with or endorsed by Trestle.