Debugger by nyldn
Debugger. Delegate only when the user explicitly starts an Octopus workflow.
- Type
- Subagent
- Repository
- nyldn/claude-octopus
- GitHub stars
- 4.1k
- License
- MIT
- Repo last updated
- Sep 26, 2026
- Source file
- .claude/agents/debugger.md
- Model
- opus
What Debugger by nyldn is
Debugger by nyldn is a subagent published in the nyldn/claude-octopus repository on GitHub, which has about 4.1k stars. The repository describes itself as: “Run multiple AI models against the same research, design, or coding task. Surface disagreements before you ship.”
A subagent is a specialist assistant that Claude can hand part of a task to. It is a markdown file whose frontmatter sets a name, a description that tells Claude when to delegate, and optionally the tools and model it may use; the body becomes the subagent's own system prompt.
Because a subagent works in its own context, it keeps the main conversation focused: Claude can send a narrow job, such as a review or a specialised analysis, to Debugger and get back a compact result.
How to install Debugger by nyldn
Claude Code
- Download debugger.md from the repository.
- Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control.
- Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Claude Cowork
- Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent.
- Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
New to extending Cowork? Our plugins guide and Customize guide explain how skills, plugins, and connectors fit together.
Inside the source file
An excerpt from .claude/agents/debugger.md, shared under the repository's MIT license. Read the full file on GitHub.
You are a debugging specialist focused on systematic problem investigation and resolution.
Core Expertise
- Root Cause Analysis: Scientific method for isolating failures
- Error Patterns: Stack traces, race conditions, memory issues, deadlocks
- Tooling: Debuggers, profilers, log analysis, network inspection
- Test Failures: Flaky tests, environment issues, dependency problems
- Production Issues: Log correlation, distributed tracing, incident response
Behavioral Traits
- Forms hypotheses before making changes
- Isolates variables systematically
- Reads error messages and stack traces carefully
- Checks recent changes and git history for clues
- Validates fixes with reproducible test cases
Response Approach
- Reproduce the issue reliably
- Read error output and stack traces carefully
- Form hypothesis about root cause
- Isolate the failing component
- Fix the root cause (not symptoms)
- Verify fix and add regression test
Output Contract
Return status: COMPLETE | BLOCKED | PARTIAL
COMPLETE
- Root Cause (mandatory)
- Fix Applied
- Regression Test Added
- Verification Results
BLOCKED
- Blocker Description
- What Was Attempted
PARTIAL
- Completed Sections
- Remaining Work
- Confidence: [0-100]
Before you install
- Read the whole file first. Skills, commands, and subagents are instructions Claude will follow, so make sure they match what you want.
- Check which tools, scripts, or MCP servers it uses. Local servers and scripts run with your permissions.
- Try it in a test project or a copy of your files before pointing it at real work.
- Pin the version you tested, and review changes before updating.
- Watch for instructions that fetch web content or run shell commands; those are where prompt injection risks start. See our prompt injection guide.
FAQ
What is Debugger by nyldn?
Debugger by nyldn is a subagent for Claude Code and Claude Cowork from the nyldn/claude-octopus repository on GitHub. Debugger. Delegate only when the user explicitly starts an Octopus workflow.
How do I install Debugger by nyldn in Claude Code?
Download debugger.md from the repository. Save it to ~/.claude/agents/ to use it in every project, or to .claude/agents/ inside one project to share it through version control. Claude Code watches these folders, so the subagent is usually available right away. Ask Claude to use it by name, or @-mention it to make sure it runs.
Can I use Debugger by nyldn in Claude Cowork?
Cowork loads subagents through plugins. If the repository is packaged as a plugin marketplace, add it under Customize → Plugins → Add marketplace and install the plugin that contains this subagent. Otherwise, bundle the file into your own plugin's agents/ folder and upload it from Customize → Plugins.
Is Debugger by nyldn safe to install?
It is a third-party community resource, not reviewed by Anthropic or this site. Read the source file first, check which tools and connectors it uses, and install only from sources you trust.
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