Question 1

What is Lemma?

Accepted Answer

Lemma is a local-first MCP server for AI coding agents such as Claude Code, Cursor and Windsurf. It cuts what enters the model's context (repeated reads, command output, unused tool schemas), stores memories next to the hashes of the files they came from so changed code makes them STALE, and keeps a ledger of what it actually saved.

Question 2

How is the Brain different from a semantic cache?

Accepted Answer

A semantic cache returns an old answer when a new question looks similar. The Brain stores each memory with hashes of its source files and serves it only while they still match; every result says whether it is a hit, a near-miss or stale.

Question 3

Is Lemma free?

Accepted Answer

Yes. 60 of its 110 tools are free, including the whole memory lifecycle and the token ledger. Pro is $5 per month and adds the tools that write, run commands, refactor and review pull requests.

Question 4

Is Lemma open-source?

Accepted Answer

The core is MIT-licensed and published on npm as @nxuss/lemma. Pro features require a license.

Question 5

Who built Lemma?

Accepted Answer

Lemma is built and maintained by Nxus Studio in Guadalajara, Jalisco, Mexico.

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