Sem MCP Server

by ataraxy-labs Your server? Claim it

local only

Sem runs on your own machine — the client starts it, so there is no endpoint to ping. 3 888 installs a week from npm. Last commit 31 Oct 2026.

Entity-level code intelligence: semantic diff, impact analysis, blame, and context for AI agents

Installs per day peak 2 022 · avg 586 · +89% w/w

a month agotoday

3 888

Installs / week

npm · @ataraxy-labs/sem

3 437

Stars

2 open issues

31 Oct 2026

Last commit

11 releases in 90 days

Apache-2.0

License

Rust

What the code does

We read the source, 1 d ago · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Runs a command on install [пакет] package.json:1

postinstall: node ./scripts/postinstall.mjs

Runs an external command agent-skill/badge/sem-live.py:136, pi/src/transaction/simple/patch_delta.py:13, pi/src/transaction/simple/container-check-v8.py:37 и ещё 4

        out = subprocess.run(cmd, cwd=cwd, capture_output=True, text=True, timeout=8).stdout

Runs an external command agent-skill/install.mjs:165, bin/sem.js:20, [пакет] bin/sem.js:20 и ещё 5

    execFileSync(process.platform === 'win32' ? 'where' : 'which', [cmd], {

Executes code built at runtime pi/src/codemode/sandbox.ts:351

  return vm.compileFunction(src, [], {

Builds a file path from a variable pi/src/transaction/simple/benchmark-literal-entities.mjs:17, pi/src/transaction/simple/benchmark-session-efficiency.mjs:13, crates/sem-cli/src/commands/check/helpers/ts.cjs:275

    await fs.mkdir(path.dirname(path.join(tmp,file)),{recursive:true});

Executes code built at runtime witness/rt/witness_rt.py:636

        exec(code, g)

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add sem -- npx -y @ataraxy-labs/sem

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "sem": {
      "command": "npx",
      "args": [
        "-y",
        "@ataraxy-labs/sem"
      ]
    }
  }
}

~/.codex/config.toml

[mcp_servers.sem]
command = "npx"
args = ["-y", "@ataraxy-labs/sem"]

.cursor/mcp.json

{
  "mcpServers": {
    "sem": {
      "command": "npx",
      "args": [
        "-y",
        "@ataraxy-labs/sem"
      ]
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "sem": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@ataraxy-labs/sem"
      ]
    }
  }
}

Alternatives to Sem

same job, measured the same way

Kai

by kailayerhq

Semantic code intelligence — call graphs, dependencies, impact analysis, and test coverage.

217 installs/wk local only

ArchGraph

by archgraph

Code intelligence platform for AI agents. 20 tools for architecture, security & impact analysis.

answering

Flyto Indexer

by flytohub

Code intelligence MCP server — impact analysis, semantic search, dependency graphs

350 installs/wk local only

Codealive MCP

by codealive-ai

Semantic code search and analysis from CodeAlive for AI assistants and agents.

local only

Maguyva

by maguyva

Code intelligence for coding agents: semantic, AST, graph, and full-text search. 279+ languages.

answering

Solumbe

by bashbop

Deterministic local repository context, impact analysis, and merge-readiness evidence for AI agents.

718 installs/wk local only

repoctx

by nugehs

Local-first code context, impact analysis, and merge-readiness verdicts for AI agents.

154 installs/wk local only

Codecanvas

by donggyun112

Python code intelligence for coding agents: call paths, control flow, and change impact.

185 installs/wk local only

Sem — questions

Answers built from our own checks of this server.

Why is there no uptime for Sem?

Sem runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package @ataraxy-labs/sem was installed 3 888 times last week.

How do I connect Sem?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls @ataraxy-labs/sem straight from npm; nothing to host, nothing to sign up for.

How many people use Sem?

The npm package @ataraxy-labs/sem was installed 3 888 times in the last week. Week over week that is +89%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Sem open source?

Yes — it is published under the Apache-2.0 licence, written in Rust, 3 437 stars on GitHub and 2 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.