Claude Smalltalk MCP Server

Connect Claude Desktop to a live Smalltalk programming environment. Browse classes, evaluate expressions, define methods, and run autonomous code review - all against a running Squeak or Cuis image. Its 15 documented tools cover smalltalk, method, define, class. It runs locally over stdio via the published package.

People connecting media tools to Claude, Cursor, VS Code, or another MCP client. The project is written in StringTemplate.

VERIFIED ACTIVE

LAST COMMIT 2026-07-14 · ★ 18 · #91 OF 155 MAINTAINED MEDIA · VERIFIED 2026-08-25

MIT · StringTemplate · how we verify → /methodology

01 · Install Claude Smalltalk

before you install - you'll need

Set SMALLTALK_MCP_CONFIG before connecting.

Claude Code

claude mcp add corporatesmalltalkconsultingltd-claudesm -- uvx claude-smalltalk

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "corporatesmalltalkconsultingltd-claudesm": {
      "command": "uvx",
      "args": [
        "claude-smalltalk"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license MIT - declared in the repository

pypi package claude-smalltalk - check the name against the project README before installing (PyPI has no namespace ownership)

registry registry publisher io.github.johnmci is not the repo owner (corporatesmalltalkconsultingltd) - the registry entry was published by someone else

03 · What Claude Smalltalk can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

With this server connected, an agent can get class metadata (superclass, ivars, methods), view source code of a method, create or modify a class definition, and add or update a method.

The 15 tools it gives your agent

Extracted from the project's README - what ClaudeSmalltalk lets an agent do.

smalltalk_task: - Delegate any Smalltalk task to a locally-configured LLM. No source code leaves your machine.
smalltalk_evaluate: - Execute Smalltalk code and return result
smalltalk_browse: - Get class metadata (superclass, ivars, methods)
smalltalk_method_source: - View source code of a method
smalltalk_define_class: - Create or modify a class definition
smalltalk_define_method: - Add or update a method
smalltalk_delete_method: - Remove a method from a class
smalltalk_delete_class: - Remove a class from the system
smalltalk_list_classes: - List classes matching a prefix
smalltalk_hierarchy: - Get superclass chain
smalltalk_subclasses: - Get immediate subclasses
smalltalk_list_categories: - List all system categories

show all 15 tools

smalltalk_classes_in_category: - List classes in a category
smalltalk_save_image: - Save the current image in place
smalltalk_save_as_new_version: - Save image/changes as next version number

Latest releases

v3.1.0 · 2026-03-12

There were problems associated with the use of anthropic, had to restructure how we called that LLM provider

v3.0.1 · 2026-03-06

Multi-Provider Agent Loop · The Smalltalk agent now works with any Ollama model, plus OpenAI, xAI, and Anthropic. Models that don't support native tool calling (like codestral) are handled automatically via a…

v2.0.0 · 2026-03-04

We've also reworked the LLM code path so you can choose your provider: Anthropic, xAI, OpenAI, or your own Ollama server. This means all Smalltalk code reading, writing, and generation can stay entirely in-house - no…

04 · Who maintains Claude Smalltalk

ClaudeSmalltalk is maintained by corporatesmalltalkconsultingltd. It's the only MCP server we track from this author; the repo dates to Jan 2026.

05 · Facts

repository: github.com/corporatesmalltalkconsultingltd/claudesmalltalk
category: media - ranked #91 of 155 actively-maintained media servers as of 2026-08-25.
registry: io.github.johnmci/ClaudeSmalltalk (active, first published 2026-01-24)
packages: pypi:claude-smalltalk

06 · Claude Smalltalk FAQ

Is Claude Smalltalk still maintained?

Yes - as of 2026-08-25, its last commit was 2026-07-14. We re-verify nightly.

What can Claude Smalltalk do?

With this server connected, an agent can get class metadata (superclass, ivars, methods), view source code of a method, create or modify a class definition, and add or update a method.

How do I install Claude Smalltalk?

Run `uvx claude-smalltalk`. The README documents one environment variable (SMALLTALK_MCP_CONFIG) to set first. Set SMALLTALK_MCP_CONFIG before connecting. You can also paste the ready-made client config above.

Does Claude Smalltalk run locally?

Yes - it's a stdio server: it runs on your machine (via uvx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Claude Smalltalk

Alternatives to Claude Smalltalk

Maintained media servers if Claude Smalltalk isn't the fit.

More media MCP servers · Audio File MCP App · YouTube Research MCP · Createya - AI Image & Video Generation · Creative Claw · Mediagen