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systematic-debugger

Subagent "systematic-debugger" from PostHog/posthog: Use this agent when you need to diagnose and fix bugs, errors, or unexpected behavior in code.

Template by PostHog

IndexedNOASSERTION★ 40,411
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Install

Works with Claude Code. Read the repository before you give any tool access to your data.

curl -fsSL https://raw.githubusercontent.com/PostHog/posthog/master/.claude/agents/systematic-debugger.md -o systematic-debugger.md

Read it and adapt it to your project before use.

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About

A Claude Code subagent definition in PostHog/posthog. Its description says: Use this agent when you need to diagnose and fix bugs, errors, or unexpected behavior in code. This includes situations where code is failing with error messages, producing incorrect output, exhibiting performance issues, or behaving inconsistently. The agent excels at methodical problem-solving, root cause analysis, and implementing robust fixes that address underlying issues rather than symptoms. This agent writes a `CODE_DEBUGGING_SESSION.md` report in the project's root folder. Examples: <example> Context: User encounters an error in their application user: "My function is throwing a TypeE Model: opus.

Use cases: debugging

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What's in it

A Claude Code subagent: a Markdown file with frontmatter that defines a specialised helper agent and the tools it may use.

For
Claude Code
Length
42 lines
File
.claude/agents/systematic-debugger.md
name
systematic-debugger
model
opus
description
Use this agent when you need to diagnose and fix bugs, errors, or unexpected behavior in code. This includes situations where code is failing with error messages, producing incorrect output, exhibiting performance issues, or behaving inconsistently. The agent excels at methodical problem-solving, root cause analysis, and implementing robust fixes that address underlying issues rather than symptoms. This agent writes a `CODE_DEBUGGING_SESSION.md` report in the project's root folder.\n\nExamples:

Sections

  1. Core Process
  2. When Stuck (After 3 Attempts)
  3. Best practices
  4. Output Structure

The repository's license isn't open source, so the text isn't shown here. Read it on GitHub.

Signals

Stars
40,411
Forks
3,551
Open issues
3,850
Contributors
596
Last commit (this folder)
Sep 1, 2026 (1 month ago)
Last release
Oct 24, 2026 (6 days ago)

From GitHub (fetched Oct 24, 2026).

Details

License
NOASSERTION
First seen
Oct 24, 2026
Last checked
Oct 24, 2026

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Cite this page

systematic-debugger. Agent Mart. https://agentmart.dev/templates/posthog-posthog-systematic-debugger (last updated 2026-10-24)