MCP server for AI interaction with live Smalltalk images
ClaudeSmalltalk MCP server is a locally run integration for AI assistants that speak the Model Context Protocol. MCP server for AI interaction with live Smalltalk images.
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.
The server ships on PyPI as httpx, so your MCP client can launch it on demand — there is no separate build step. Add the server block to your client's configuration, restart it, and the tools register themselves.
Once ClaudeSmalltalk is connected, these are the calls the assistant has available:
smalltalk_evaluate — Execute Smalltalk code and return resultsmalltalk_browse — Get class metadata (superclass, ivars, methods)smalltalk_method_source — View source code of a methodsmalltalk_define_class — Create or modify a class definitionsmalltalk_define_method — Add or update a methodsmalltalk_delete_method — Remove a method from a classsmalltalk_delete_class — Remove a class from the systemsmalltalk_list_classes — List classes matching a prefixsmalltalk_hierarchy — Get superclass chainsmalltalk_subclasses — Get immediate subclassessmalltalk_list_categories — List all system categoriessmalltalk_classes_in_category — List classes in a categoryYou will need one environment variable: SMALLTALK_MCP_CONFIG. Keep credentials in your client's env block or a secrets manager rather than in a file you might commit.
Plenty of developer tooling servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. ClaudeSmalltalk's toolset — smalltalk_evaluate, smalltalk_browse, smalltalk_method_source and 11 more — is a fair guide to whether it matches your workflow. It is maintained by johnmci; worth a glance at recent repository activity before you build anything load-bearing on it.
We check each listing at SyncDev against the project's documentation before it goes live — if something here drifts out of date, it is a bug worth reporting.
| Tool | What it does |
|---|---|
| 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 |
| 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 |
{
"mcpServers": {
"claudesmalltalk": {
"command": "uvx",
"args": ["httpx"],
"env": {
"SMALLTALK_MCP_CONFIG": "your-value"
}
}
}
}Add to claude_desktop_config.json, then restart Claude Desktop.
| Variable | Description | Required |
|---|---|---|
| SMALLTALK_MCP_CONFIG | Configuration value read at startup. | Optional |
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