Nexus MCP

An MCP server that enables AI models to invoke AI CLI agents (Codex, Claude Code, OpenCode) as tools. Provides parallel execution, automatic retries with exponential backoff, JSON-first response parsing, 10 discoverable prompt templates, model tier classification, and persistent preferences through seven MCP tools, four MCP resources, and ten MCP prompts.

People connecting this server to Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-08-25 · ★ 4 · #262 OF 848 MAINTAINED OTHER · VERIFIED 2026-08-25

MIT · Python servers · how we verify → /methodology

01 · Install Nexus MCP

before you install - you'll need

Set NEXUS_CLAUDE_MODEL, NEXUS_OPENCODE_MODEL, NEXUS_CODEX_MODELS, NEXUS_CLAUDE_MODELS, NEXUS_OPENCODE_MODELS before connecting. NEXUS_CODEX_MODEL is optional or environment-specific per the README.

Claude Code

claude mcp add j7an-nexus-mcp -- uvx nexus-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "j7an-nexus-mcp": {
      "command": "uvx",
      "args": [
        "nexus-mcp"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

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 local process (stdio) - runs on your machine with your user's permissions

license MIT - declared in the repository

pypi package nexus-mcp - check the name against the project README before installing (PyPI has no namespace ownership)

registry namespace io.github.j7an is GitHub-verified and matches the repo owner

03 · What Nexus MCP can do

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

Latest releases

v1.0.2 · 2026-07-09

adopt shared-workflows v4.2.2

v1.0.0 · 2026-05-30

bump the minor-and-patch group with 3 updates · canonicalize trivy-action version comments to satisfy zizmor · bump the all-actions group across 1 directory with 5 updates · add Gemini model fallback on retryable…

v0.11.0 · 2026-04-22

update github/codeql-action digest to b8bb9f2 · update github/codeql-action digest to c10b806 · add 5-day dependency cool-down with exploit scanning · resolve YAML parsing errors in cool-down workflows · add…

04 · Who maintains Nexus MCP

nexus-mcp is maintained by j7an. It's the only MCP server we track from this author; the repo dates to Feb 2026.

05 · Facts

repository
github.com/j7an/nexus-mcp
category
other - ranked #262 of 848 actively-maintained other servers as of 2026-08-25.
release cadence
2 releases in the last 90 days (latest 2026-07-09)
registry
io.github.j7an/nexus-mcp (active, first published 2026-03-22 · 9 versions)
packages
pypi:nexus-mcp

06 · Nexus MCP FAQ

What is Nexus MCP?

An MCP server that enables AI models to invoke AI CLI agents (Codex, Claude Code, OpenCode) as tools. Provides parallel execution, automatic retries with exponential backoff, JSON-first response parsing, 10 discoverable prompt templates, model tier classification, and persistent preferences through seven MCP tools, four MCP resources, and ten MCP prompts.

Is Nexus MCP still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-25 and it shipped 2 releases in the last 90 days. We re-verify nightly.

How do I install Nexus MCP?

Run `uvx nexus-mcp`. The README documents 6 environment variables (NEXUS_CODEX_MODEL, NEXUS_CLAUDE_MODEL, NEXUS_OPENCODE_MODEL…) to set first. Set NEXUS_CLAUDE_MODEL, NEXUS_OPENCODE_MODEL, NEXUS_CODEX_MODELS, NEXUS_CLAUDE_MODELS, NEXUS_OPENCODE_MODELS before connecting. NEXUS_CODEX_MODEL is optional or environment-specific per the README. You can also paste the ready-made client config above.

Does Nexus MCP run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Nexus MCP

Alternatives to Nexus MCP

Maintained other servers if Nexus MCP isn't the fit.

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  3. Zotero MCP (54yyyu) Search, read, annotate, and add to your Zotero research library, local or web. ★ 4,780 · 2026-08-25
  4. Firebase MCP Gives AI development tools Firebase-specific capabilities and expertise. ★ 4,460 · 2026-08-25
  5. Microsoft Fabric MCP Server MCP tools for interacting with Microsoft Fabric ★ 3,598 · 2026-08-21
  6. Ship Swift 40+ production-ready SwiftUI recipes for building full-stack iOS apps via MCP. ★ 2,968 · 2026-08-09

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