Borrowing it
Nothing to install: this file belongs to mumez/smalltalk-interop-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/mumez/smalltalk-interop-mcp-server/main/CLAUDE.mdgit clone --depth 1 https://github.com/mumez/smalltalk-interop-mcp-serverWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/mumez/smalltalk-interop-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/mumez/smalltalk-interop-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/mumez/smalltalk-interop-mcp-server/claude-md.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.02689 | $0.02689 |
| Opus 5 | $0.01345 | $0.01345 |
| Sonnet 5 | $0.00538 | $0.00538 |
| Haiku 4.5 | $0.00269 | $0.00269 |
Grade A, and why
smalltalk-interop-mcp-server CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 7d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 346 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Project Overview
This is a Python-based MCP (Model Context Protocol) server designed to communicate with local Smalltalk images (Pharo or Squeak). The server provides an interface for:
- Code Evaluation: Execute Smalltalk expressions and return results
- Code Introspection: Retrieve source code, comments, and metadata for classes and methods
- Search & Discovery: Find classes, traits, methods, references, and implementors
- Package Management: Export and import packages in Tonel format
- Project Installation: Install projects using Metacello
- Test Execution: Run test suites at package or class level
- UI Debugging: Capture screenshots and inspect UI structure for World morphs, and (Pharo-only) Spec presenters and Roassal visualizations
Development Setup
This project uses uv as the Python package manager. Prerequisites:
- Python 3.10 or later
- uv package manager
- A Smalltalk Interop Server installed in the target image:
- PharoSmalltalkInteropServer for Pharo
- SqueakSmalltalkInteropServer for Squeak
Environment Variables
You can configure the server using environment variables:
SIS_PORT: Port number for the Smalltalk Interop Server (default: 8086)
Common Commands
# Install dependencies
uv sync --dev
# Run the MCP server
uv run smalltalk-interop-mcp-server
# Run the MCP server with custom port
SIS_PORT=8081 uv run smalltalk-interop-mcp-server
# Run tests
uv run pytest
# Run tests with verbose output
uv run pytest -v
# Run linting and formatting
uv run ruff check
uv run ruff format
# Format markdown files
uv run mdformat .
# Run pre-commit hooks
uv run pre-commit run --all-files
Architecture Overview
The codebase follows a layered architecture with clean separation of concerns. Since Pharo and Squeak both run the same Smalltalk Interop Server HTTP API, the MCP implementation does not need to distinguish between backends at runtime.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 7d ago First seen · 346 lines · 2,689 tokens per session scan A c2e574d6fc09
smalltalk-interop-mcp-server CLAUDE.md is an instructions file published in the GitHub repository mumez/smalltalk-interop-mcp-server (0 stars, last pushed 20d ago), licensed MIT. It adds 2,689 tokens to every session, about $0.0134 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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