add-mcp-tool

Add MCP Tool

Add a new tool to an existing FastMCP server with interactive configuration.

Usage

/add-mcp-tool [tool-name]

Arguments

• [tool-name]: Optional - Name for the new tool (will prompt if not provided)

Execution Instructions for Claude Code

When this command is run:

1. Locate the FastMCP server in the current project
2. Gather tool requirements through interactive questions
3. Generate tool code based on configuration
4. Add tool to server by modifying existing files or creating new ones

Interactive Session Flow

1. Locate Server

First, find the FastMCP server in the project:

Looking for FastMCP server...

Found: src/server.ts

Is this the correct server file? (yes/no):

If not found:

I couldn't find a FastMCP server. Please provide the path to your server file:

2. Tool Basics

Let's add a new tool to your MCP server.

Tool name (lowercase, use hyphens):
Example: "fetch-data", "create-file", "query-database"

Tool name:

Tool description (shown to LLM clients):
Example: "Fetches data from the specified API endpoint"

Description:

3. Parameters

Does this tool require parameters?

1. No parameters
2. Simple parameters (strings, numbers, booleans)
3. Complex parameters (objects, arrays, enums)

Select (1-3):

If parameters needed:

Let's define the parameters one by one.

Parameter 1:
  Name:
  Type (string/number/boolean/array/object):
  Required? (yes/no):
  Description:

Add another parameter? (yes/no):

For enum types:

Enum values (comma-separated):
Example: "json,xml,csv"

Values:

4. Return Type

What does this tool return?

1. Simple text response
2. Multiple content items
3. Image content
4. Audio content
5. Resource reference
6. Custom structure

Select (1-6):

5. Tool Features

Which features do you need?

[ ] Logging (log.info, log.error, etc.)
[ ] Progress reporting (for long operations)
[ ] Streaming output (for text generation)
[ ] Authorization check (canAccess)
[ ] Error handling with UserError

Select features (comma-separated numbers, or 'none'):