Everything MCP Server
This MCP server attempts to exercise all the features of the MCP protocol. It is not intended to be a useful server, but rather a test server for builders of MCP clients. It implements prompts, tools, resources, sampling, and more to showcase MCP capabilities.
Components
Tools
echo
- Simple tool to echo back input messages
- Input:
message
(string): Message to echo back
- Returns: Text content with echoed message
add
- Adds two numbers together
- Inputs:
a
(number): First numberb
(number): Second number
- Returns: Text result of the addition
longRunningOperation
- Demonstrates progress notifications for long operations
- Inputs:
duration
(number, default: 10): Duration in secondssteps
(number, default: 5): Number of progress steps
- Returns: Completion message with duration and steps
- Sends progress notifications during execution
sampleLLM
- Demonstrates LLM sampling capability using MCP sampling feature
- Inputs:
prompt
(string): The prompt to send to the LLMmaxTokens
(number, default: 100): Maximum tokens to generate
- Returns: Generated LLM response
getTinyImage
- Returns a small test image
- No inputs required
- Returns: Base64 encoded PNG image data
printEnv
- Prints all environment variables
- Useful for debugging MCP server configuration
- No inputs required
- Returns: JSON string of all environment variables
annotatedMessage
- Demonstrates how annotations can be used to provide metadata about content
- Inputs:
messageType
(enum: "error" | "success" | "debug"): Type of message to demonstrate different annotation patternsincludeImage
(boolean, default: false): Whether to include an example image
- Returns: Content with varying annotations:
- Error messages: High priority (1.0), visible to both user and assistant
- Success messages: Medium priority (0.7), user-focused
- Debug messages: Low priority (0.3), assistant-focused
- Optional image: Medium priority (0.5), user-focused
- Example annotations:
getResourceReference
- Returns a resource reference that can be used by MCP clients
- Inputs:
resourceId
(number, 1-100): ID of the resource to reference
- Returns: A resource reference with:
- Text introduction
- Embedded resource with
type: "resource"
- Text instruction for using the resource URI
Resources
The server provides 100 test resources in two formats:
- Even numbered resources:
- Plaintext format
- URI pattern:
test://static/resource/{even_number}
- Content: Simple text description
- Odd numbered resources:
- Binary blob format
- URI pattern:
test://static/resource/{odd_number}
- Content: Base64 encoded binary data
Resource features:
- Supports pagination (10 items per page)
- Allows subscribing to resource updates
- Demonstrates resource templates
- Auto-updates subscribed resources every 5 seconds
Prompts
simple_prompt
- Basic prompt without arguments
- Returns: Single message exchange
complex_prompt
- Advanced prompt demonstrating argument handling
- Required arguments:
temperature
(number): Temperature setting
- Optional arguments:
style
(string): Output style preference
- Returns: Multi-turn conversation with images
resource_prompt
- Demonstrates embedding resource references in prompts
- Required arguments:
resourceId
(number): ID of the resource to embed (1-100)
- Returns: Multi-turn conversation with an embedded resource reference
- Shows how to include resources directly in prompt messages
Logging
The server sends random-leveled log messages every 15 seconds, e.g.:
Usage with Claude Desktop (uses stdio Transport)
Add to your claude_desktop_config.json
:
Usage with VS Code
For quick installation, use of of the one-click install buttons below...
For manual installation, add the following JSON block to your User Settings (JSON) file in VS Code. You can do this by pressing Ctrl + Shift + P
and typing Preferences: Open User Settings (JSON)
.
Optionally, you can add it to a file called .vscode/mcp.json
in your workspace. This will allow you to share the configuration with others.
Note that the
mcp
key is not needed in the.vscode/mcp.json
file.
NPX
Running from source with HTTP+SSE Transport (deprecated as of 2025-03-26)
Run from source with Streamable HTTP Transport
Running as an installed package
Install
Run the default (stdio) server
Or specify stdio explicitly
Run the SSE server
Run the streamable HTTP server
This server cannot be installed
A test MCP server implementing all protocol features including tools, resources, prompts, and sampling to help developers build and test MCP clients.
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