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Debug (Grade A)Security-tested development skill for Claude AI. Grade A. Systematic debugging with hypothesis testing. Persistent across sessions.

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Daniel NikulshynReviewed by Daniel Nikulshyn·Updated July 2026

Overview

Debug (Grade A) is a security-tested development skill for Claude AI that enables systematic debugging with hypothesis testing. It is designed to persist across sessions, allowing users to track every hypothesis, test, and finding in a debug file. The skill spawns a Task(subagent_type: "pbr:debugger") for investigation work, ensuring that all analysis is delegated to the debugger subagent. This approach minimizes random investigation and ensures that every action has a reason and is documented. The debugging process involves creating a debug directory, checking for active debug sessions, and presenting the user with choices to proceed. It follows a structured flow, including steps to ensure the debug directory exists, load depth profiles, and handle existing debug files.

Key features

  • Hypothesis-driven debugging
  • Persistent debug sessions
  • Debugger subagent for investigation work
  • Debug directory creation and management
  • Loading depth profiles and handling existing debug files

Pricing

Model
Free
Category
Skills
Rating
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Use cases

Software Development Debugging

Debug (Grade A) can be used in software development to systematically debug code issues with hypothesis testing, ensuring that all investigation steps are documented and tracked.

AI Model Debugging

This skill can be applied to debug AI models, helping developers to identify and fix issues with the model using a structured debugging approach.

Pros & Cons

Pros

  • Systematic debugging approach with hypothesis testing
  • Persistent across sessions
  • Delegates analysis to a debugger subagent for efficient investigation
  • Tracks every hypothesis, test, and finding in a debug file

Cons

  • Requires careful setup and directory creation
  • May involve complex debugging sessions with multiple rounds

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Q&A

What are the key features of Debug (Grade A)?

The key features include hypothesis-driven debugging, persistent debug sessions, debugger subagent for investigation work, debug directory creation and management, and loading depth profiles and handling existing debug files.

Asked by Ingrid Bauer · Feb 16, 2026

How does Debug (Grade A) handle investigation work?

Debug (Grade A) spawns a Task(subagent_type: 'pbr:debugger') for investigation work, ensuring that all analysis is delegated to the debugger subagent.

Asked by Timur Nazarov · Feb 1, 2026

Is Debug (Grade A) persistent?

Yes, Debug (Grade A) is designed to persist across sessions, allowing users to track every hypothesis, test, and finding in a debug file.

Asked by Hannah Goldberg · Jan 21, 2026

What is Debug (Grade A)?

Debug (Grade A) is a security-tested development skill for Claude AI that enables systematic debugging with hypothesis testing.

Asked by Ulrik Madsen · Dec 21, 2025

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