Built for Claude and ChatGPT

When a founder uses a sales tool, a lost edit or a vague error is an annoyance. When Claude or ChatGPT is doing the work, the same gap turns into a wrong email sent to the wrong person, or a loop that retries until the budget runs out.

LeagueBoots is built for Claude and ChatGPT first, so they can send cold email and keep your CRM without stopping to ask. Here’s what that means in practice.

Nothing is overwritten

Every change to a record keeps the version before it, and returns the record before and after. Claude or ChatGPT can read any record as it stood on a past date, or list what changed since then. That lets you check what they did later, and see an account as it was before they did it.

Batches, not clicks

Tools take batches: up to 50 new records or 10 changes in one call, and up to 100 results per search. Importing a list of target accounts is a few requests instead of one per row.

No duplicates

Networks fail and requests get retried. A company whose domain or a contact whose email is already in the CRM is refused, with a pointer to update it instead, so a retry never adds the same company or contact twice.

Lookups and actions are separate

Tools that look things up and tools that act are separate and labeled as such. Looking up a record can’t change it. Claude or ChatGPT can run lookups without asking you each time, and you decide how they handle tools that act, like sending an email.

One record underneath

Every product writes to the same store of people, companies and touches. The email Claude or ChatGPT sends and the reply that comes back land on the same account. Nothing has to be synced between vendors, so nothing gets lost or duplicated, and there’s always one picture of each account.

Where it works

You connect LeagueBoots once in Claude or ChatGPT, and both products are there. Any other app that supports MCP works too.

Corrected on October 20, 2026: tools keep every version of a record instead of returning sources and confidence scores, take batches of 50 new records or 10 changes instead of 1,000 rows, and refuse duplicate companies and contacts instead of making every call safe to retry. Updated the same day: LeagueBoots now has two products, Sales Engagement and CRM.