Claude

Step-by-step setup for connecting ZoomInfo MCP to Claude Desktop via the connector marketplace.

March 19, 2026·

Rowan BaileySenior Director, Product

Overview

ZoomInfo is listed in the Claude connector marketplace, making setup straightforward. Once connected, Claude can invoke ZoomInfo tools automatically based on your prompts, with no need to specify which tool to use.

Setup

Open Claude Desktop settings

Go to Settings → Connectors.

Find ZoomInfo

Search for ZoomInfo in the connector marketplace and select it.

Authenticate

Verify the connection

Start a new chat and ask: "What ZoomInfo tools do you have access to?" Claude will list all available tools.

Managing Tool Permissions

Claude lets you control which ZoomInfo tools it can invoke. In Settings → Connectors, select the ZoomInfo connector to see individual tool toggles. You can enable or disable specific tools (for example, to prevent enrichment calls from consuming credits unexpectedly).

By default, Claude will ask for confirmation before invoking a new tool for the first time.

How Claude Selects Tools

Claude reasons over all available ZoomInfo tool descriptions and selects the right tool (or sequence of tools) for your request. You don't need to specify which tool to use, though you can if you want to.

For example:

"Research Acme Corp" → Claude invokes Account Research
"Find the VP of Sales at companies like Salesforce" → Claude chains Find Similar Companies → Search Contacts
"Enrich these 10 contacts" → Claude invokes Enrich Contacts with up to 25 records per call

Context Window Behavior

Direct tools (Search, Enrich, Lookup) return data into Claude's context window, making it available for follow-up questions within the same conversation.

Context agents (Account Research, Contact Research) run a sub-agent layer that synthesizes large payloads before returning a targeted summary. This keeps Claude's context window manageable for complex account research tasks.

Troubleshooting

Tools aren't appearing: start a new session. Claude refreshes the tool list at the beginning of each session. Note that Claude defaults to "load tools when needed," only surfacing tools based on the context of the conversation. You can change this to "tools already loaded" to eliminate this as a potential source of the problem: click the + in the chat interface, go to Connectors, then Tool Access to adjust this setting.

Authentication errors: disconnect and reconnect the ZoomInfo connector in Settings. Make sure you're using your personal ZoomInfo login, not a shared or admin-only account.

Credit errors during enrichment: confirm your account has bulk data credits enabled. Recurring monthly credits are not supported by MCP.

PreviousClients Next ChatGPT