Sema MCP Server

A Lisp where LLM agents are language primitives, not an SDK - compiled to a fast bytecode VM, shipped as a single binary.

People who work with interpreter, lisp and programming language and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Rust.

VERIFIED ACTIVE

LAST COMMIT 2026-09-09 · ★ 51 · #124 OF 208 MAINTAINED DOCUMENTATION · VERIFIED 2026-09-18

MIT · Rust servers · how we verify → /methodology

01 · Install Sema

Claude Desktop

Settings → Extensions → Install, then select the https://github.com/sema-lisp/sema/releases/download/v1.36.0/sema.mcpb .mcpb bundle

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as Claude Desktop extension (.mcpb bundle)

license MIT - declared in the repository

registry vendor namespace com.sema-lang - domain-verified with the official MCP registry

03 · What Sema can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Latest releases

v1.36.0 · 2026-08-31

Release Notes · Fixed · sema web panicked at startup for any app that uses import. · __web/prepare built the multi-file .vfs archive on the VM thread, and the · build constructs fresh interpreters whose prelude load is…

v1.35.0 · 2026-08-18

Release Notes · Added · Notebook LLM cost tracking (#68). Cost visibility is now ambient instead · of a (llm/session-usage) cell you remember to add. Every cell eval runs in · a per-leaf usage scope (the same mechanism…

v1.34.2 · 2026-08-04

Release Notes · Fixed · macOS Apple Silicon binaries are signed and published again. The · aarch64-apple-darwin build failed importing the Developer ID certificate · with MAC verification failed during PKCS12 import.…

04 · Who maintains Sema

Sema is maintained by sema-lisp. It's the only MCP server we track from this author; the repo dates to Feb 2026.

05 · Facts

repository: github.com/sema-lisp/sema
category: documentation - ranked #124 of 208 actively-maintained documentation servers as of 2026-09-18.
release cadence: 10+ releases in the last 90 days (latest 2026-08-31)
registry: com.sema-lang/sema (active, first published 2026-07-17 · 8 versions)
packages: mcpb:https://github.com/sema-lisp/sema/releases/download/v1.36.0/sema.mcpb

06 · Sema FAQ

What is Sema?

A Lisp where LLM agents are language primitives, not an SDK - compiled to a fast bytecode VM, shipped as a single binary.

Is Sema still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-09 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

07 · Alternatives to Sema

Alternatives to Sema

Maintained documentation servers if Sema isn't the fit.

Pairs well with

Servers that cover what Sema doesn't - only shown when the pairing reason fits the companion.

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