Single tool MCP

Listed September 17, 2026

one-mcp

Single tool MCP

Example: simple word counter

{
  "mcpServers": {
    "simple_word_counter": {
      "command": "npx",
      "args": [
        "-y",
        "github:nwtgck/one-mcp",
        "-n", "simple_word_counter",
        "-d", "Count words",
        "--p.inputText.type", "string",
        "--p.inputText.description", "Input text",
        "-s", "args.inputText.split(' ').length"
      ]
    }
  }
}

Example: random string generator

You can use top-level await.

{
  "mcpServers": {
    "random_string_generator": {
      "command": "npx",
      "args": [
        "-y",
        "github:nwtgck/one-mcp",
        "-n", "random_string_generator",
        "-d", "Generate random string",
        "--p.len.type", "number",
        "--p.len.description", "Result string length",
        "-s", "const crypto = await import(`node:crypto`);const chars = `ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789`;const randomArr = new Uint32Array(new Uint8Array(crypto.randomBytes(args.len * 4)).buffer);[...randomArr].map(n => chars.charAt(n % chars.length)).join('');"
      ]
    }
  }
}

--help

Options:
      --help         Show help                                         [boolean]
      --version      Show version number                               [boolean]
  -n, --name         Tool name                               [string] [required]
  -d, --description  Tool description                     [string] [default: ""]
  -s, --script       JavaScript expression                   [string] [required]

stdioLocal

Pick your client and paste the snippet. Each one is the same server, written the way that client expects it.

bash

Run the command below in your terminal.
Restart Claude Code, then check the connection with /mcp.

claude mcp add simple_word_counter -- npx -y github:nwtgck/one-mcp -n simple_word_counter -d "Count words" --p.inputText.type string --p.inputText.description "Input text" -s "args.inputText.split(' ').length"

{
  "mcpServers": {
    "simple_word_counter": {
      "args": [
        "-y",
        "github:nwtgck/one-mcp",
        "-n",
        "simple_word_counter",
        "-d",
        "Count words",
        "--p.inputText.type",
        "string",
        "--p.inputText.description",
        "Input text",
        "-s",
        "args.inputText.split(' ').length"
      ],
      "command": "npx"
    }
  }
}

code --add-mcp '{"name":"simple_word_counter","args":["-y","github:nwtgck/one-mcp","-n","simple_word_counter","-d","Count words","--p.inputText.type","string","--p.inputText.description","Input text","-s","args.inputText.split(' ').length"],"command":"npx"}'

[mcp_servers.simple_word_counter]
command = "npx"
args = ["-y", "github:nwtgck/one-mcp", "-n", "simple_word_counter", "-d", "Count words", "--p.inputText.type", "string", "--p.inputText.description", "Input text", "-s", "args.inputText.split(' ').length"]

Runs locally on your device. Your client starts the server itself, so nothing has to be hosted.

Install with your agent

Paste this prompt into your agent. It reads this page and does the setup for you.

prompt

Read https://aiagentslisting.com/mcp/one-mcp to learn what the "One Mcp" MCP server does and how to install it. Add it to my coding agent's MCP configuration as documented on that page, then confirm the server connects and list the tools it exposes.

Agents can also browse this directory over MCP at https://aiagentslisting.com/api/mcp

This server runs locally, so we can't read its tool list over the web yet.

Coming soon:Auto tool detectionServer badgesServer score

F45%

45 / 100 pointsGrade F

Required items: 2 / 34 of 9 checks passed

What's missing

Exposes toolsRequiredThe server reports at least one tool, from its manifest or a live read.
0/15
Verified liveWe connected to the server and it answered a real MCP handshake.
0/20
Ships promptsThe server exposes at least one prompt template.
0/8
Ships resourcesThe server exposes at least one resource.
0/8
Claimed by ownerThe maintainer proved ownership of this listing.
0/4

All 9 checks (4 passed)

Installation methodRequiredThe README documents at least one way to install or connect.
15/15
Exposes toolsRequiredThe server reports at least one tool, from its manifest or a live read.
0/15
Has a READMERequiredThe repository ships documentation we could read.
10/10
Verified liveWe connected to the server and it answered a real MCP handshake.
0/20
Easy installA paste-ready client config (an mcpServers block) is documented.
12/12
Has a licenseThe repository declares a license.
8/8
Ships promptsThe server exposes at least one prompt template.
0/8
Ships resourcesThe server exposes at least one resource.
0/8
Claimed by ownerThe maintainer proved ownership of this listing.
0/4

Maintain this server? Claiming proves you own the listing and earns the last 4 points.

Claim this listing

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One Mcp