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diffctx MCP Server

by nikolay-e Your server? Claim it
local only

diffctx runs on your own machine — the client starts it, so there is no endpoint to ping. 597 installs a week from pypi. Last commit 17 Sep 2026.

Selects the minimum code an LLM needs to review a git diff

Installs per day peak 799 · avg 145 · +16% w/w
a month agotoday
597
Installs / week
pypi · diffctx
4
Stars
40 open issues
17 Sep 2026
Last commit
0 releases in 90 days
Apache-2.0
License
Rust

What the code does

We read the source, 21 h ago · rules 3dff92dd89df

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.

const result = spawnSync(binaryPath, process.argv.slice(2), { stdio: 'inherit' });
const binaryPath = path.join(__dirname, binaryName);
In the project's build, not in the package

Found in continuous integration, deployment or infrastructure files, or in a neighbouring package of the same monorepo. None of this is installed when you add the server: it describes how the project is built and released. We list it because a leaked key in a build pipeline is still a real problem, but it is not something this server does on your machine.

      - name: Approve PR (all update types)
        env:
          PR_URL: ${{ github.event.pull_request.html_url }}

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.

Three servers free · no card

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.

run in your terminal
claude mcp add diffctx -- uvx diffctx
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "diffctx": {
      "args": [
        "diffctx"
      ],
      "command": "uvx"
    }
  }
}
~/.codex/config.toml
[mcp_servers.diffctx]
command = "uvx"
args = ["diffctx"]
.cursor/mcp.json
{
  "mcpServers": {
    "diffctx": {
      "args": [
        "diffctx"
      ],
      "command": "uvx"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "diffctx": {
      "args": [
        "diffctx"
      ],
      "command": "uvx"
    }
  }
}

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diffctx — questions

Answers built from our own checks of this server.

Why is there no uptime for diffctx?
diffctx 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 pypi package diffctx was installed 597 times last week.
How do I connect diffctx?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls diffctx straight from pypi; nothing to host, nothing to sign up for.
How many people use diffctx?
The pypi package diffctx was installed 597 times in the last week. Week over week that is +16%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is diffctx open source?
Yes — it is published under the Apache-2.0 licence, written in Rust, 4 stars on GitHub and 40 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.