MCP Server

Active

MIT

Hex SSH MCP Server

io.github.levnikolaevich/hex-ssh-mcp

Token-efficient SSH MCP with hash-verified files and persistent tmux sessions for remote code execution.

What is the Hex SSH MCP server?

The Hex SSH MCP server is a Model Context Protocol server that provides token-efficient SSH access with hash-verified file integrity and persistent tmux session management. It exposes 14 tools for executing remote commands, managing files, and maintaining long-running sessions over SSH connections.

Hex SSH enables Claude and other AI agents to securely execute commands and manage files on remote servers via SSH. It optimizes token usage through hash verification of file contents and supports persistent tmux sessions for stateful workflows, making it ideal for remote development, server management, and automated deployment tasks.

How to install Hex SSH

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

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

{
  "mcpServers": {
    "hex-ssh-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@levnikolaevich/hex-ssh-mcp"
      ]
    }
  }
}

Tools & capabilities

Tools this server exposes to the agent.

SSH command execution — Execute commands on remote servers via SSH
File hash verification — Verify file integrity using cryptographic hashes
Persistent tmux sessions — Create and manage long-running terminal sessions that persist across requests
Remote file management — Read, write, and manipulate files on remote systems

Use cases

Execute deployment scripts and configuration changes on remote servers
Maintain stateful development environments using persistent tmux sessions
Verify file integrity and detect unauthorized changes on remote systems
Automate server maintenance and monitoring tasks via SSH
Manage multi-step workflows that require persistent session state across multiple operations

Hex SSH MCP server FAQ

What is the Hex SSH MCP server?

Hex SSH is an MCP server that provides token-efficient SSH access to remote servers with 14 tools for command execution, file management, hash verification, and persistent tmux session handling.

Is it free to use?

Yes, the server is open-source and available on npm as @levnikolaevich/hex-ssh-mcp under the MIT license.

How do I install it in Claude or Cursor?

Install via npm: npm install @levnikolaevich/hex-ssh-mcp, then configure it in your MCP settings to connect to your SSH servers.

What authentication does it require?

It requires SSH credentials (username/password or key-based authentication) to connect to remote servers.

Why use Hex SSH instead of direct SSH?

Hex SSH optimizes token usage through hash-verified files and provides persistent tmux sessions, making it more efficient for AI-driven remote operations and multi-step workflows.

Can it maintain state across multiple requests?

Yes, persistent tmux sessions allow stateful workflows to continue across multiple tool invocations without losing context.

README (reference)

Source of truth, from the repository.

Claude-Codex Skills

A compact marketplace of standalone engineering skills for Claude Code and Codex.

Supports the portable Agent Plugins v1 standard while retaining native Claude Code and Codex distribution compatibility.

Why this repository is intentionally small: Earlier coding models needed a large orchestration and evaluation harness to follow complex workflows reliably. Modern Claude and Codex models work better with concise procedural guidance, so that machinery has been removed. These skills retain only the domain knowledge, decision gates, tool guidance, and evidence checklists worth bringing into context.

Browse the skills catalog or install only the plugins you need below.

The repository intentionally contains only the skills, minimal plugin manifests, two host-specific marketplace catalogs, documentation, and a static catalog site. It has no MCP servers, orchestration hierarchy, distributed shared resources, generated skill copies, or evaluation harness.

Plugins

Review Suite

Index	Skill	Purpose
11	Plan Reviewer	Validate an implementation plan against repository evidence before execution.
12	Delivery Reviewer	Review completed code through independent risk-selected perspectives.

Codebase Audit Suite

Index	Skill	Purpose
21	Documentation Auditor	Audit documentation trust, coverage, structure, and factual accuracy.
22	Codebase Auditor	Audit cross-cutting code health, security, delivery, and maintainability.
23	Test Suite Auditor	Audit test value, coverage, isolation, and oracle strength.
24	Architecture Auditor	Audit system boundaries, ownership, contracts, and dependency topology.
25	Persistence Auditor	Audit queries, transactions, consistency, and resource lifecycle.

Optimization Suite

Index	Skill	Purpose
31	Performance Optimizer	Profile, experiment, and keep only measured improvements.
32	Dependency Upgrader	Upgrade dependencies in reversible, verified batches.
33	Code Modernizer	Replace or simplify bounded capabilities when net value is proven.
34	Benchmark Comparator	Compare alternatives with a frozen, reproducible experiment contract.
35	Surgical Change Implementer	Implement a bounded change through the smallest complete root-cause solution.

Testing Suite

Index	Skill	Purpose
41	Test Strategy Planner	Design a risk-based, decision-complete test strategy without changing code.
42	Acceptance Test Builder	Create reproducible acceptance tests through observable product boundaries.

Product Discovery Suite

Index	Skill	Purpose
51	Opportunity Evaluator	Compare product opportunities using current evidence and a low-cost validation path.

Maintainer Suite

Optional maintainer toolkit: skill 61 reviews skill repositories, skill 62 publishes any Git repository with equivalent remote evidence, and skills 63–64 publish GitHub releases and Discussions. Users who only consume the engineering skills do not need to install it.

Index	Skill	Purpose
61	Skill Reviewer	Review standalone skills and configured distribution surfaces before publication.
62	Repository Publisher	Validate, commit, push, and remotely verify approved repository changes.
63	Release Publisher	Prepare and publish an approved tagged GitHub release.
64	Community Announcer	Draft and publish fact-checked GitHub Discussions project announcements.

Architecture Suite

Creates durable architecture artifacts without coupling the skills to one another. Each workflow operates independently and communicates only through optional repository documents.

Index	Skill	Purpose
71	System Design Baseline Builder	Establish measurable architecture drivers and constraints in one project baseline.
72	Current Architecture Documenter	Document implemented architecture from repository evidence.
73	System Design Proposal Builder	Turn requirements and constraints into a decision-complete target design.
74	Architecture Decision Recorder	Record one significant decision with alternatives and consequences.
75	Architecture Diagram Builder	Create evidence-backed current or target architecture views.
76	Architecture Migration Planner	Plan a reversible current-to-target transition with compatibility and rollback.

Install in Claude Code

Add the marketplace and install only the suites you need:

/plugin marketplace add levnikolaevich/claude-code-skills
/plugin install review-suite@levnikolaevich-skills-marketplace
/plugin install codebase-audit-suite@levnikolaevich-skills-marketplace
/plugin install optimization-suite@levnikolaevich-skills-marketplace
/plugin install testing-suite@levnikolaevich-skills-marketplace
/plugin install product-discovery-suite@levnikolaevich-skills-marketplace
/plugin install maintainer-suite@levnikolaevich-skills-marketplace
/plugin install architecture-suite@levnikolaevich-skills-marketplace
/reload-plugins

Invoke a skill by its namespaced name, for example /review-suite:ln-12-delivery-reviewer.

For local development, load one plugin directly:

claude --plugin-dir ./plugins/review-suite

Install in Codex

codex plugin marketplace add levnikolaevich/claude-code-skills
codex plugin add review-suite@levnikolaevich-skills-marketplace
codex plugin add codebase-audit-suite@levnikolaevich-skills-marketplace
codex plugin add optimization-suite@levnikolaevich-skills-marketplace
codex plugin add testing-suite@levnikolaevich-skills-marketplace
codex plugin add product-discovery-suite@levnikolaevich-skills-marketplace
codex plugin add maintainer-suite@levnikolaevich-skills-marketplace
codex plugin add architecture-suite@levnikolaevich-skills-marketplace

Repository layout

.
├── .agents/plugins/marketplace.json       # Codex catalog
├── .claude-plugin/marketplace.json        # Claude Code catalog
└── plugins/
    ├── review-suite/
    ├── codebase-audit-suite/
    ├── optimization-suite/
    ├── testing-suite/
    ├── product-discovery-suite/
    ├── maintainer-suite/
    └── architecture-suite/

Each plugin contains a portable Agent Plugins v1 plugin.json, the current .codex-plugin/plugin.json OpenAI host adapter, and one shared skills/<skill>/SKILL.md tree.

This is the smallest practical shared layout for distributed plugins:

Both hosts use skills/<name>/SKILL.md, so each skill has one canonical copy.
Agent Plugins clients discover the portable package through root plugin.json; its minimal manifest owns only the schema target and stable name.
Current ChatGPT and Codex packaging still requires .codex-plugin/plugin.json, which remains the single owner of mutable version, description, publisher, and interface metadata.
Claude Code scans each marketplace source's standard skills/ directory, so a duplicate Claude-specific plugin manifest is unnecessary.
agents/openai.yaml, references, scripts, assets, hooks, agents, and MCP configuration are optional and omitted until a concrete need appears.

The structure follows the Agent Plugins v1 specification, current OpenAI plugin guide, Agent Skills specification, Claude Code skill guide, and Claude Code plugin reference.

Indexing

The first digit identifies the plugin and the second identifies the skill within it: 1x review, 2x audit, 3x optimization, 4x testing, 5x product discovery, 6x repository maintenance, and 7x architecture artifact creation. See the canonical allocation and overflow rules in AGENTS.md.

License

MIT

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