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How to connect Weaviate MCP to Claude

Connect Claude Web, Desktop and Cowork to Weaviate MCP. Search weaviate collections for api errors, find customer feedback about onboarding issues, and more using natural language, with authentication handled for you.

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Weaviate MCP is a provider-hosted Query Agent for searching Weaviate Cloud collections. It turns natural-language questions into AI-powered collection searches.

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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 Weaviate account to Claude via Composio Connect, enabling it to search Weaviate collections for API errors, find customer feedback about onboarding issues, compare research papers on vector databases, 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.

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Connecting Weaviate 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 Weaviate account

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

For example, ask Claude to:

  • "Search Weaviate collections for API errors"
  • "Find customer feedback about onboarding issues"
  • "Compare research papers on vector databases"

It will prompt you to authenticate and authorize access.

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

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

The Weaviate MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Weaviate account. It provides structured and secure access to your Weaviate Cloud collections, so your agent can answer natural-language questions, run AI-powered searches, apply structured filters, perform aggregations, and return matching data on your behalf.

  • Natural-language questions: Have your agent ask questions about your Weaviate collections and turn them into searches or aggregations before providing a final answer.
  • Semantic collection search: Let the agent find relevant collection data using AI-powered semantic search rather than relying only on exact keyword matches.
  • Structured filtering: Direct your agent to combine semantic search with structured filters to narrow results to the data that matches your criteria.
  • Data aggregation: Instruct your agent to generate aggregations from your collection data when answering questions that require grouped or calculated results.
  • Matching result retrieval: Have your agent return the Weaviate objects that match a search, so you can work directly with the relevant collection data.

Troubleshooting

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

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

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

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

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

  • 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 Weaviate.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Weaviate authorization link not work?

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

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

4. Why do Weaviate actions fail after they worked before?

The Weaviate connection can expire or lose permission.

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

5. How do I switch to a different Weaviate account?

Claude can manage the Weaviate connection for you.

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

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

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

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Weaviate 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 Weaviate.
TOOLS

Supported Tools

Every Weaviate MCP action and event your agent gets out of the box.

Query agent ask

Ask Mode transforms your query into actionable searches or aggregations, and then provides a final answer to the question.

Query agent search

Search Mode combines AI-powered semantic search with structured filtering and returns the matching Weaviate objects directly.

FRAMEWORKS

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ChatGPT logo

ChatGPT

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Hermes logo

Hermes

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Atomic Agent logo

Atomic Agent

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FAQ

Frequently asked questions

With a standalone Weaviate MCP server, the agents and LLMs can only access a fixed set of Weaviate tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Weaviate 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 Weaviate tools.

Yes, absolutely. You can configure which Weaviate 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 Weaviate data and credentials are handled as safely as possible.

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