Pharo Smalltalk MCP Server

MCPOpen SourceMIT25.3

by mumez • Testing & QA

A local MCP server that lets agents interact with a Pharo Smalltalk image for code evaluation, introspection, package management, search, and test execution.

Example Use Cases

1
Evaluate Smalltalk expressions and receive results from a local Pharo image to drive interactive code generation or debugging workflows.
2
Inspect code, comments, and metadata—fetching class and method source or searching implementors and references to enable code understanding and refactoring tasks.
3
Manage packages and projects—exporting/importing Tonel packages, installing Metacello projects, and running package or class test suites as part of automation pipelines.

Description

This MCP server proxies the PharoSmalltalkInteropServer APIs to provide 19 tools for evaluating Smalltalk expressions, retrieving class and method sources, searching classes/methods/traits/references, managing Tonel packages, installing projects via Metacello, and running tests. It is designed for local use and integrates with MCP tooling (e.g., Claude/uv) to let agents perform programmatic operations against a Pharo image. The project includes mock-based tests so CI and development do not require a live Pharo instance, enabling fast and deterministic testing.

Capabilities(22 total)

Tools (22)

eval

Evaluate a Pharo Smalltalk expression with PharoSmalltalkInteropServer. Args: code: The Smalltalk code to evaluate Returns: dict: API response with success/error and result - Success: {"success": True, "result": any} - result contains the evaluation result - Error: {"success": False, "error": str} - error contains error message

code:string*

get_class_source

Get the source code of a Smalltalk class. Args: class_name: The name of the class to retrieve source for Returns: dict: API response with success/error and result - Success: {"success": True, "result": str} - result contains the class source code - Error: {"success": False, "error": str} - error contains error message

class_name:string*

get_method_source

Get the source code of a specific method in a class. Args: class_name: The name of the class containing the method method_name: The name of the method to retrieve source for is_class_method: True for class-side methods, False for instance methods (default: False) Returns: dict: API response with success/error and result - Success: {"success": True, "result": str} - result contains the method source code - Error: {"success": False, "error": str} - error contains error message

class_name:string*method_name:string*is_class_method:boolean

get_class_comment

Get the comment of a Smalltalk class. Args: class_name: The name of the class to retrieve comment for Returns: dict: API response with success/error and result - Success: {"success": True, "result": str} - result contains the class comment - Error: {"success": False, "error": str} - error contains error message

class_name:string*

search_classes_like

Find classes matching a pattern. Args: class_name_query: The pattern to search for in class names Returns: dict: API response with success/error and result - Success: {"success": True, "result": list[str]} - result contains list of matching class names - Error: {"success": False, "error": str} - error contains error message

class_name_query:string*

Quick Actions

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Security

Scanned 2 month(s) ago

Risk Level

MINIMAL

Read-only data retrieval, no side effects

Trust Score

C50/100

5/17 checks passed

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Quick Stats

Service TypeMCP

Pricing ModelFree

Capabilities22 Tools / 0 Prompts / 0 Resources

Ownermumez

CategoryTesting & QA

DependenciesStandalone

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