How do I use MCP Echo Service?

1. Click on "Install Server". 2. Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state. 3. In the chat, type @ followed by the MCP server name and your instructions, e.g., "@MCP Echo Service echo back 'Hello, world!' in uppercase" That's it! The server will respond to your query, and you can continue using it as needed. Here is a step-by-step guide with screenshots.

Echo MCP Server

mpak NimbleBrain Discord License: MIT

A Model Context Protocol (MCP) server that echoes messages, delays, and structured JSON data. Useful for testing MCP client integrations, verifying protocol connectivity, and validating tool call behavior.

View on mpak registry | Built by

Install

Install with mpak:

mpak install @nimblebraininc/echo

Claude Code

claude mcp add echo -- mpak run @nimblebraininc/echo

Claude Desktop

Add to your claude_desktop_config.json:

{ "mcpServers": { "echo": { "command": "mpak", "args": ["run", "@nimblebraininc/echo"] } } }

See the mpak registry page for full install options.

Related MCP server: Echo MCP Server

Tools

echo_message

Echo back a message with optional uppercase formatting.

Parameter	Type	Required	Description
`message`	`string`	Yes	The message to echo back
`uppercase`	`boolean`	No	Convert the message to uppercase (default: `false`)

Example call:

{ "name": "echo_message", "arguments": { "message": "Hello Echo!", "uppercase": true } }

Example response:

{ "original_message": "Hello Echo!", "echoed_message": "HELLO ECHO!", "uppercase_applied": true, "message_length": 11, "timestamp": "2025-01-15T12:00:00+00:00" }

echo_with_delay

Echo back a message after a simulated delay. Useful for testing timeout handling and async behavior.

Parameter	Type	Required	Description
`message`	`string`	Yes	The message to echo back
`delay_seconds`	`number`	No	Delay in seconds, max 5.0 (default: `1.0`)

Example call:

{ "name": "echo_with_delay", "arguments": { "message": "Delayed echo", "delay_seconds": 2.0 } }

Example response:

{ "original_message": "Delayed echo", "echoed_message": "Delayed echo", "requested_delay": 2.0, "actual_delay": 2.001, "start_time": "2025-01-15T12:00:00+00:00", "end_time": "2025-01-15T12:00:02+00:00", "timestamp": "2025-01-15T12:00:02+00:00" }

echo_json

Echo back structured JSON data with validation and analysis.

Parameter	Type	Required	Description
`data`	`object`	Yes	JSON object to echo back

Example call:

{ "name": "echo_json", "arguments": { "data": { "name": "test", "count": 42, "active": true } } }

Example response:

{ "original_data": {"name": "test", "count": 42, "active": true}, "echoed_data": {"name": "test", "count": 42, "active": true}, "analysis": { "key_count": 3, "keys": ["name", "count", "active"], "data_types": {"name": "str", "count": "int", "active": "bool"}, "total_size": 42 }, "timestamp": "2025-01-15T12:00:00+00:00" }

Quick Start

Local Development

git clone https://github.com/NimbleBrainInc/mcp-echo.git cd mcp-echo # Install dependencies uv sync # Run the server (stdio mode) uv run python -m mcp_echo.server # Or run via FastMCP uv run fastmcp run src/mcp_echo/server.py

The server supports HTTP transport with:

Health check: GET /health
MCP endpoint: POST /mcp

Development

# Install with dev dependencies uv sync --group dev # Run unit tests make test # Run with coverage make test-cov # Run all checks (format, lint, typecheck, unit tests) make check # Format uv run ruff format . # Lint uv run ruff check .

E2E Tests

End-to-end tests validate the full MCPB bundle lifecycle: building the bundle, deploying it into a Docker container, and calling tools over HTTP.

Prerequisites: Docker running, mcpb CLI installed (npm install -g @anthropic-ai/mcpb)

make test-e2e

The tests:

Vendor dependencies for the Docker container's Linux architecture
Build a .mcpb bundle with mcpb pack
Serve the bundle over HTTP
Start a nimbletools/mcpb-python container that downloads and runs the bundle
Verify the /health endpoint, MCP tool listing, and tool invocation via streamable HTTP

About

Echo MCP Server is published on the mpak registry and built by NimbleBrain. mpak is an open registry for Model Context Protocol servers.

License

MIT

This server cannot be installed

-

security - not tested

A

license - permissive license

-

quality - not tested

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Resources

GitHub Repository

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Related Servers

MCP Echo Service

Echo MCP Server

Install

Claude Code

Claude Desktop

Tools

echo_message

echo_with_delay

echo_json

Quick Start

Local Development

Development

E2E Tests

About

License

Resources

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