Code Investigate

by sd0xdev

Code Investigate is a Quality skill for Claude Code, published by sd0xdev in sd0x-harness.

188 stars24 forkson sd0xdev/sd0x-harnessAdded 2026/09/06Repository updated 2026/09/05

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agent-harnessclaude-codeclaude-code-plugincodexharness-engineeringskills

Install in seconds

Install Code Investigate

Copy Code Investigate into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/sd0xdev/sd0x-harness/tree/main/skills/code-investigate ~/.claude/skills/code-investigate

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/sd0xdev/sd0x-harness.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: skills/code-investigate/SKILL.md in sd0xdev/sd0x-harness
Installs to: ~/.claude/skills/code-investigate
Collection: One of 25 skills cataloged from this repository
Category: Quality — 1745 skills

What Code Investigate does

Code Investigate performs a dual-perspective code investigation to trace how a feature works and consolidate findings from independent analysis. Use it for deep code research, not quick lookup or code review.

Code Investigate is cataloged under Quality on DirSkills. Code Investigate comes from a repository tagged agent-harness, claude-code, claude-code-plugin, codex and harness-engineering.

Documentation

README

Excerpt

Code Investigate Skill

Trigger

Keywords: investigate code, how feature works, trace implementation, dual confirmation, deep dive, how code works, what this code does, code research

When NOT to Use

Just need quick lookup (use Grep/Glob directly)
Code review (use codex-review)
System verification (use feature-verify)
Git history tracking (use git-investigate)

Core Principle

Codex must explore independently. Feeding Claude's conclusions to Codex is prohibited.

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Code Investigate

What else does sd0xdev publish alongside Code Investigate?
Code Investigate is one of 25 skills that DirSkills catalogs from sd0xdev/sd0x-harness, the repository it ships in. Its siblings there include Adr, Architecture Design and Ask. Each one is a separate skill with its own page in this directory, installs the same way Code Investigate does, and is maintained by sd0xdev in that same repository. The rest of the collection is listed on the sd0xdev/sd0x-harness page.
How does Code Investigate compare to other Quality skills?
Code Investigate ranks #1601 by stars among the 1745 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Code Investigate against them. Open each page to compare what they document and how they install.