Nexus MCP

Name: Nexus MCP
Author: j7an

by j7anversion 2.1.3i★ –iRuns on your computer

Registry nameio.github.j7an/nexus-mcp

Install

Overview

Description from the maker (original English)

Delegate tasks to coding agents (Claude, Codex, Antigravity) from any MCP client

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Developer tools

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "nexus": {
      "command": "uvx",
      "args": [
        "nexus-mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add nexus -- uvx nexus-mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "nexus": {
      "command": "uvx",
      "args": [
        "nexus-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "nexus": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "nexus-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account j7an, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Developer toolsi

More stars than 0% of the other 4923 servers in this category
Published to the registry more recently than 72% of the other 4923 servers in this category
Basic checks equal to or better than 100% of the other 4923 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Nexus MCP safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (2.1.3) reached the registry 14 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: GitHub, Desktop Commander, Cloudflare MCP

Alternatives

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

nexus-mcp

MCP server that delegates tasks to coding agents — Claude Code via the Claude Agent SDK, Codex via the Codex App Server, and Antigravity via the Antigravity SDK — from any MCP client.

Install

Backends are optional extras; install the ones you use.

Extra	Backend	Adds
`claude`	Claude Agent SDK	`claude-agent-sdk` (bundles the Claude Code CLI, ~100 MB)
`codex`	Codex App Server	`openai-codex` (bundles the Codex CLI, ~120–150 MB)
`antigravity`	Antigravity SDK	`google-antigravity` (bundles the Antigravity Go harness, ~40 MB)
`all`	every backend

uvx --with 'nexus-mcp[all]' nexus-mcp          # run directly

pip install 'nexus-mcp[claude]' # or install pip install 'nexus-mcp[codex]' # Codex only pip install 'nexus-mcp[antigravity]'

Claude Code MCP config:

{ "mcpServers": { "nexus": { "command": "uvx", "args": ["--with", "nexus-mcp[all]", "nexus-mcp"] } } }

Authentication is the agent's own: log in with claude, or set ANTHROPIC_API_KEY; for Codex, log in with codex login (credentials in ~/.codex are shared). Antigravity uses GEMINI_API_KEY, or Vertex AI with GOOGLE_GENAI_USE_VERTEXAI, GOOGLE_CLOUD_PROJECT, and GOOGLE_CLOUD_LOCATION, authenticated through Application Default Credentials (ADC). It does not use Google-account login.

Windows: recent claude-agent-sdk releases ship no Windows wheel with a bundled CLI; install Claude Code so claude is on PATH.

Tool: `prompt`

Runs one agent turn and returns its final answer.

Parameter	Default	Meaning
`backend`	required	`claude`, `codex`, or `antigravity`
`prompt`	required	Task for the agent
`cwd`	required	Absolute project directory
`profile`	`read_only`	Permission profile (below)
`session_id`	—	Continue this conversation
`fork`	`false`	Branch `session_id` into a new conversation
`model`	provider default	Model id or alias
`timeout`	`600`	Seconds before the turn is cancelled

Returns {backend, session_id, output, usage}. Conversations are stored by the agent itself (~/.claude/projects, $CODEX_HOME/sessions, ~/.nexus-mcp/antigravity), so a session_id keeps working after nexus-mcp restarts. Antigravity does not support fork=true.

Permission profiles

Actions outside the chosen profile are denied automatically — nobody is prompted.

Profile	Allows
`read_only`	Read/Glob/Grep; `git diff`/`log`/`show` with `--no-ext-diff --no-textconv`
`workspace_write`	Plus file edits inside `cwd` and Bash inside the OS sandbox
`full_access`	Everything

Codex enforces profiles with its OS sandbox (read-only, workspace-write, danger-full-access) and never asks for approval.

Antigravity enforces workspace containment in its harness and uses the OS sandbox for commands. workspace_write fails if that sandbox is unavailable.

Resource: `nexus://backends`

JSON list of {name, installed, models, hint}; hint gives the install command for a missing extra. Codex lists its models; Claude and Antigravity report null (Antigravity does not provide a model list).

Configuration

Variable	Default	Meaning
`NEXUS_CLAUDE_SETTINGS_PROFILE`	`isolated`	Claude settings to load: `isolated` (none), `project` (project `.claude/`), `inherit` (all, including user settings). Profiles still bound every tool call.

Migrating from v1

v1	v2
`prompt(cli="codex")` (`codex exec`)	`prompt(backend="codex", cwd=…)` (App Server)
`prompt(cli=…, execution_mode="yolo")`	`prompt(backend=…, profile="full_access", cwd=…)`
`batch_prompt`	Parallel `prompt` calls from the client
`agent_start` / `agent_status` / `agent_result`	`prompt` (synchronous)
`agent_continue` / `agent_fork`	`prompt(session_id=…)` / `prompt(session_id=…, fork=true)`
`agent_review`	`prompt(profile="read_only", prompt="Review …")`
`agent_cancel`	Cancel the tool call in the client
`agent_respond`, elicitation	Removed — choose a profile instead
Preferences, model tiers, MCP prompts	Removed
OpenCode runners and tools	Removed
`NEXUS_*` variables	Removed except `NEXUS_CLAUDE_SETTINGS_PROFILE`

Development

uv sync --all-extras --all-groups

uv run pytest # unit + e2e uv run pytest -m integration # real CLI (slow, makes model calls) uv run mypy src/nexus_mcp && uv run ruff check . && uv run ruff format --check .

License

MIT

Nexus MCP

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Developer toolsi

Common questions

Alternatives

GitHub

Desktop Commander

Cloudflare MCP

README from the maker

nexus-mcp

Install

Tool: prompt

Permission profiles

Resource: nexus://backends

Configuration

Migrating from v1

Development

License

Tool: `prompt`

Resource: `nexus://backends`