Is the Smalltalk Debugger skill free?

Yes. The skill itself is free from mumez/smalltalk-dev-plugin. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Smalltalk Debugger SkillProof Score?

8.8/10 — installs cleanly 4/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 5/5.

How do I install Smalltalk Debugger?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Smalltalk Debugger with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Smalltalk Debugger

Pharo/Smalltalk error-diagnosis and Transcript-logging workflow for AI coding agents.

by mumez · mumez/smalltalk-dev-plugin

Works with setup

Install — copy the command Download source ↗

Test report

Verdict: Works with setup
Score: 8.8/10
Tested: Jul 15, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · f77ee0b

Solid Pharo-specific debugging playbook (Tonel-only edits, printString-safe MCP returns, NonInteractiveTranscript for headless output) that clearly beats generic debugging advice on a real comparison — but it only does anything wired to the plugin's smalltalk-interop/smalltalk-validator MCP servers and a live Pharo image, none of which travel with a standalone copy of just the skill folder.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 4/5
Triggers reliably 5/5
Output vs. baseline 8/10
Docs & honesty 5/5

What Smalltalk Debugger does

Gives an AI editor a systematic Pharo Smalltalk debugging playbook: classify the error (MessageNotUnderstood, KeyNotFound, SubscriptOutOfBounds, AssertionFailure), reproduce incrementally via an eval tool, inspect intermediate values safely, detect stuck UI debugger windows, and log through Transcript in headless/Docker images. Triggers on Pharo test failures, Smalltalk exceptions, hangs during MCP calls, or requests to add debug logging/trace call sites.

How to install Smalltalk Debugger

git clone https://github.com/mumez/smalltalk-dev-plugin
mkdir -p ~/.claude/skills
cp -r smalltalk-dev-plugin/skills/smalltalk-debugger ~/.claude/skills/smalltalk-debugger

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Smalltalk Debugger

/smalltalk-debugger Pharo/Smalltalk error-diagnosis and Transcript-logging workflow for AI coding agents.

It also activates on plain-language prompts like these:

My Pharo test throws MessageNotUnderstood and I can't figure out why
Getting a KeyNotFound error in my Smalltalk Dictionary lookup, please help
The Pharo debugger window seems stuck again during this MCP call

Frequently asked questions

Is the Smalltalk Debugger skill free?: Yes. The skill itself is free from mumez/smalltalk-dev-plugin. SkillProof publishes the install command and an independent test verdict at no cost.
Does Smalltalk Debugger work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 15, 2026. Verdict: Works with setup. Solid Pharo-specific debugging playbook (Tonel-only edits, printString-safe MCP returns, NonInteractiveTranscript for headless output) that clearly beats generic debugging advice on a real comparison — but it only does anything wired to the plugin's smalltalk-interop/smalltalk-validator MCP servers and a live Pharo image, none of which travel with a standalone copy of just the skill folder.
What is the Smalltalk Debugger SkillProof Score?: 8.8/10 — installs cleanly 4/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 5/5.
How do I install Smalltalk Debugger?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Smalltalk Debugger with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.