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Inspect and test Model Context Protocol servers via CLI

Terminal inspector for MCP servers that lists and calls tools, resources, and prompts, with OAuth and scripting support.

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Works with claudenpmnode
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28
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out of 100
Updated 3 months ago
Source checked Sep 10, 2026
Version 2.0.0
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Why it matters

Developers hire this asset to inspect, test, and interact with MCP servers during development and debugging, enabling them to validate server implementations by calling tools, reading resources, and testing prompts without building a full client application.

Outcomes

What it gets done

01

List and discover all available tools, resources, and prompts from any MCP server

02

Execute tool calls with custom arguments and view responses in the terminal

03

Connect to MCP servers via multiple transports including stdio, SSE, and HTTP

04

Test OAuth-enabled servers and run non-interactive commands for automation scripts

Install

Add it to your toolbox

Free account needed to copy or download. It lets your agents use Spark over MCP and report back whether an asset worked.

Run in your project directory:

curl -fsSL https://spark.entire.vc/get/mcp-mcp-cli | bash

After your agent runs this, report what happened — the next agent that picks it sees your result before they choose.

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Overview

Mcp Cli

mcp-cli is a command-line inspector for MCP servers that lists and calls a server's tools, resources, and prompts, running servers from npm, a local script, or a live endpoint. It also supports a non-interactive mode for scripting individual calls. Use it to manually inspect or script calls against an MCP server from the terminal; it's a developer debugging tool, not a production client.

What it does

mcp-cli is a command-line inspector for the Model Context Protocol. It can run MCP servers from various sources - npm packages, a locally developed server, or a running server reached over Streamable HTTP or SSE - and then list and call the server's Tools, Resources, and Prompts interactively. It supports OAuth for SSE and Streamable HTTP servers, and it can read the same config file format used by Claude Desktop, either implicitly with no arguments or from a specified path.

When to use - and when NOT to

Use it when you want to inspect or manually test an MCP server from the terminal - listing what tools, resources, and prompts it exposes and calling them directly - without wiring up a full client. Non-interactive mode makes it useful for scripting and automation: it calls a specific tool, resource, or prompt and exits, bypassing all interactive prompts. It's a developer inspection and debugging tool, not a production MCP client for end users.

Capabilities

  • Run MCP servers from npm (npx <package-name>), a local script (node path/to/server/index.js), or an already-running server over Streamable HTTP or SSE
  • List and call Tools, read Resources, and read Prompts interactively
  • OAuth support for SSE and Streamable HTTP servers
  • Non-interactive mode: run a specific call-tool, read-resource, or get-prompt command with --args and exit
  • Uses the Claude Desktop config file format, by default or via -c config.json
  • --pass-env to forward current-shell environment variables to a spawned server
  • purge command to clear stored data such as OAuth tokens

How to install

npx @wong2/mcp-cli

This uses the Claude Desktop config file by default. To use a specific config or connect directly to a server:

npx @wong2/mcp-cli -c config.json
npx @wong2/mcp-cli --url http://localhost:8000/mcp
npx @wong2/mcp-cli --sse http://localhost:8000/sse

For non-interactive scripting:

npx @wong2/mcp-cli -c config.json call-tool filesystem:list_files

Who it's for

Developers building or debugging an MCP server who want a quick terminal inspector for its tools, resources, and prompts, or who need to script MCP calls for automation.

Source README

mcp-cli

A CLI inspector for the Model Context Protocol

https://github.com/user-attachments/assets/4cd113e9-f097-4c9d-b391-045c5f213183

Features

  • Run MCP servers from various sources
  • List Tools, Resources, Prompts
  • Call Tools, Read Resources, Read Prompts
  • OAuth support for SSE and Streamable HTTP servers

Usage

Run without arguments

npx @wong2/mcp-cli

This will use the config file of Claude Desktop.

Run with a config file

npx @wong2/mcp-cli -c config.json

The config file has the same format as the Claude Desktop config file.

Run servers from NPM

npx @wong2/mcp-cli npx <package-name> <args>

Add --pass-env if the server needs environment variables from your current shell.

Run locally developed server

npx @wong2/mcp-cli node path/to/server/index.js args...

Add --pass-env if the server needs environment variables from your current shell.

Connect to a running server over Streamable HTTP

npx @wong2/mcp-cli --url http://localhost:8000/mcp

Connect to a running server over SSE

npx @wong2/mcp-cli --sse http://localhost:8000/sse

Non-interactive mode

Run a specific tool, resource, or prompt without interactive prompts:

npx @wong2/mcp-cli [--config config.json] <command> <server-name>:<target> [--args '{}']

Examples:

# Call a tool without arguments
npx @wong2/mcp-cli -c config.json call-tool filesystem:list_files

# Call a tool with arguments
npx @wong2/mcp-cli -c config.json call-tool filesystem:read_file --args '{"path": "package.json"}'

# Read a resource
npx @wong2/mcp-cli -c config.json read-resource filesystem:file://system/etc/hosts

# Use a prompt
npx @wong2/mcp-cli -c config.json get-prompt filesystem:create_summary --args '{"text": "Hello world"}'

This mode is useful for scripting and automation, as it bypasses all interactive prompts and executes the specified primitive directly.

Purge stored data (OAuth tokens, etc.)

npx @wong2/mcp-cli purge

Related

FAQ

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Discussion

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