Pharo Smalltalk Interop MCP Server

@mumez

Basic information

About Pharo Smalltalk Interop MCP Server

MCP server to communicate local Pharo Smalltalk image.

#smalltalk#pharo

Pharo Smalltalk Interop MCP Server config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "smalltalk-interop": {
      "command": "uvx",
      "args": [
        "--from",
        "git+https://github.com/mumez/pharo-smalltalk-interop-mcp-server.git",
        "pharo-smalltalk-interop-mcp-server"
      ],
      "env": {
        "PHARO_SIS_PORT": "8086"
      }
    }
  }
}

Pharo Smalltalk Interop MCP Server tools

Tool list not available yet

This listing does not currently have a tool list to display. This does not mean the server has no tools; check its documentation for supported capabilities.

Fetch the live tool list by running this server in a temporary sandbox using the button above.

Overview

What is Pharo Smalltalk Interop Mcp Server?

A local MCP server that communicates with a Pharo Smalltalk image, providing code evaluation, introspection, search, package management, project installation, test execution, UI debugging, and server configuration. It is intended for developers working with Pharo Smalltalk.

How to use Pharo Smalltalk Interop Mcp Server?

Requires Python 3.10+, uv package manager, and a Pharo image with PharoSmalltalkInteropServer installed. Run using uvx (no installation) or after cloning the repository using uv run. Configure with environment variable PHARO_SIS_PORT (default 8086). The server exposes 22 MCP tools.

Key features of Pharo Smalltalk Interop Mcp Server

Execute Smalltalk expressions and return results
Retrieve class and method source code and comments
Search classes, methods, traits, implementors, and references
Export and import packages in Tonel format
Install projects via Metacello
Run test suites at package or class level
Capture screenshots and inspect UI structure for debugging
Retrieve and modify server settings dynamically

Use cases of Pharo Smalltalk Interop Mcp Server

Debug and inspect a live Pharo image from an MCP-compatible client
Automate package export/import and project installation in CI/CD pipelines
Search for method implementors and references during refactoring
Run tests and view results without leaving the development environment
Assist AI‑powered coding assistants to interact with Pharo code

Frequently asked questions

What are the prerequisites?

Python 3.10 or later, uv package manager, and a Pharo image with PharoSmalltalkInteropServer installed.

How do I configure the server port?

Set the `PHARO_SIS_PORT` environment variable (default 8086).

Does the server work without a live Pharo instance?

No, a running Pharo image with PharoSmalltalkInteropServer is required. Tests use mocking to avoid this dependency.

What transports or authentication are supported?

The README only describes local execution via stdio (MCP default). No authentication or alternative transports are mentioned.

Can I add custom settings beyond the documented ones?

Yes, the `apply_settings` tool accepts arbitrary key‑value pairs; the documented setting is `stackSize` (default 100).

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