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How to connect Ideal Postcodes to Claude

Connect Claude Web, Desktop and Cowork to Ideal Postcodes MCP. Lookup address for sw1a 1aa, cleanse and standardize 100 addresses, and more using natural language, with authentication handled for you.

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Ideal Postcodes provides UK and international address search, postcode lookup, and address cleansing APIs. Use it to validate addresses, clean lists, and ensure accurate contact data.

9 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Ideal Postcodes account to Claude via Composio Connect, enabling it to lookup address for SW1A 1AA, cleanse and standardize 100 addresses, validate postcode and geocode coordinates, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate Ideal Postcodes with

ChatGPT WorkHermes

Connecting Ideal Postcodes to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your Ideal Postcodes account

Back in Claude, ask it to connect to Ideal Postcodes or give it any Ideal Postcodes-related task.

For example, ask Claude to:

  • "Lookup address for SW1A 1AA"
  • "Cleanse and standardize 100 addresses"
  • "Validate postcode and geocode coordinates"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Ideal Postcodes account is ready to use.

What is the Ideal Postcodes Claude Connector, and what's possible with it?

The Ideal Postcodes MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Ideal Postcodes account. It provides structured and secure access so your agent can perform Ideal Postcodes operations on your behalf.

Troubleshooting

1. Why does Claude not use the Composio connector for Ideal Postcodes?

The connector can show as connected, but Claude must use it in each Ideal Postcodes conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Ideal Postcodes again.

2. Why does Claude show an MCP server error before Ideal Postcodes connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Ideal Postcodes.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Ideal Postcodes.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Ideal Postcodes authorization link not work?

The Composio connector is one server. Your Ideal Postcodes account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Ideal Postcodes connection.
  • Composio creates a fresh Ideal Postcodes authorization link.
  • Open that link in your browser and finish the Ideal Postcodes sign-in.

4. Why do Ideal Postcodes actions fail after they worked before?

The Ideal Postcodes connection can expire or lose permission.

  • Ask Claude to inspect the Ideal Postcodes connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Ideal Postcodes account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Ideal Postcodes.
  • If the action still fails with a permission error, check that the connected account has that permission in Ideal Postcodes itself.

5. How do I switch to a different Ideal Postcodes account?

Claude can manage the Ideal Postcodes connection for you.

  • Ask Claude to disconnect or delete the current Ideal Postcodes account.
  • Ask Claude to connect Ideal Postcodes again.
  • Open the new Composio authorization link for Ideal Postcodes.
  • Sign in with the other Ideal Postcodes account in the browser.
  • After the account connects, ask Claude to retry the Ideal Postcodes task.

6. Why is my Ideal Postcodes connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Ideal Postcodes connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Ideal Postcodes tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Ideal Postcodes.
TOOLS

Supported Tools

Every Ideal Postcodes action and event your agent gets out of the box.

Find Address Suggestions

Return ranked address suggestions for a partial address without resolving them; resolving a selected suggestion is a separate paid lookup.

Find Place Suggestions

Return ranked country, city, and administrative-area suggestions without resolving them; resolving a selected place is a separate paid lookup.

Get Address by Identifier

Retrieve a UK address by UDPRN or UMPRN.

Lookup Postcode

Return addresses at a UK postcode, or an Irish Eircode when enabled; successful results consume paid lookups.

Resolve Address Suggestion

Resolve an address suggestion ID to a complete GBR or USA address.

Resolve Place

Resolve a place suggestion ID to full geography and coordinates.

Search Addresses

Search complete UK address records by text, filters, or coordinates; successful results consume paid lookups.

Validate Address

Match and standardize a GBR or USA address with confidence details.

Validate Contact

Validate an email address or international phone number using an optional paid dataset enabled on the connected Ideal Postcodes API key.

FRAMEWORKS

How to build Ideal Postcodes MCP Agent with another framework

ChatGPT Work logo

ChatGPT Work

Use Ideal Postcodes MCP with ChatGPT Work

Hermes logo

Hermes

Use Ideal Postcodes MCP with Hermes

FAQ

Frequently asked questions

With a standalone Ideal Postcodes MCP server, the agents and LLMs can only access a fixed set of Ideal Postcodes tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Ideal Postcodes and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Ideal Postcodes tools.

Yes, absolutely. You can configure which Ideal Postcodes scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Ideal Postcodes data and credentials are handled as safely as possible.

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