Borrowing it
Nothing to install: this file belongs to mumez/pharo-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/pharo-smalltalk-interop-mcp-server/main/CLAUDE.mdgit clone --depth 1 https://github.com/mumez/pharo-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/pharo-smalltalk-interop-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/mumez/pharo-smalltalk-interop-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/mumez/pharo-smalltalk-interop-mcp-server/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/mumez/pharo-smalltalk-interop-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/mumez/pharo-smalltalk-interop-mcp-server/claude-md.svg" alt="Reviewed on agentmods" width="80" 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 | $0.02406 | $0.02406 |
| Opus 5 | $0.01203 | $0.01203 |
| Sonnet 5 | $0.00481 | $0.00481 |
| Haiku 4.5 | $0.00241 | $0.00241 |
Grade A, and why
pharo-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 10d 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 — 331 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 Pharo Smalltalk images. 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, 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
- Pharo with PharoSmalltalkInteropServer installed
Environment Variables
You can configure the server using environment variables:
PHARO_SIS_PORT: Port number for PharoSmalltalkInteropServer (default: 8086)
Common Commands
# Install dependencies
uv sync --dev
# Run the MCP server
uv run pharo-smalltalk-interop-mcp-server
# Run the MCP server with custom port
PHARO_SIS_PORT=8081 uv run pharo-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:
Core Components
-
core.py- HTTP client layerPharoClientclass handles all HTTP communication with PharoSmalltalkInteropServer- Connects to
localhost:8086by default - Comprehensive error handling for connection, HTTP, and JSON parsing errors
- Enhanced error handling supporting detailed error information from PharoSmalltalkInteropServer
- 22 core operations mapped to Pharo API endpoints
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.
- 10d ago First seen · 331 lines · 2,406 tokens per session scan A 0fe3bf24aae4
pharo-smalltalk-interop-mcp-server CLAUDE.md is an instructions file published in the GitHub repository mumez/pharo-smalltalk-interop-mcp-server (12 stars, last pushed 29d ago), licensed MIT. It adds 2,406 tokens to every session, about $0.0120 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 2026-08-30.
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