Best root cause analysis skills for Claude Code, Codex and other agents.

Investigates a session where Superpowers went wrong, reads the transcripts on disk and produces an evidence-cited report, optionally prepared as a bug report for the maintainers.

obra/superpowers

Digs into why code is shaped the way it is by checking git history, pull requests and connected tools in parallel, then reporting a cited read on the tradeoffs.

cursor/plugins

Investigates failing Pester tests in PowerShell CI jobs by following a six-step workflow from pull request status to documented fix recommendations.

PowerShell/PowerShell

Decides whether an OpenLogi device problem on macOS is a privacy-permission (TCC) problem, using agent log lines, and says which identity needs which grant.

AprilNEA/OpenLogi

Forms a two-agent committee with contrasting profiles to analyze a stuck problem in parallel, reconcile their views and return a consensus plan without editing files.

getpaseo/paseo

Mines local Copilot CLI session logs for dotnet/maui to rank costly or failing runs, tag recurring failure modes, propose repo edits and emit guard evals.

dotnet/maui

Investigates a stubbornly failing Playwright test as a possible product bug, using error output, screenshots, traces and server code, and writes a structured bug report.

appsmithorg/appsmith

Investigates suspected bugs in the daisyUI monorepo through read-only analysis, then writes a decision-ready fix plan in tmp/bugs without changing any product code.

saadeghi/daisyui

Investigates bugs, errors and stack traces in phases and requires a root-cause hypothesis to be confirmed before any fix is written.

garrytan/gstack

Fixes failing Playwright specs by reading the error, classifying the cause in the test code and applying corrections that follow project conventions.

appsmithorg/appsmith

Traces a bug through a code knowledge graph, following callers, callees and execution flow before opening source files, within a small token budget.

tirth8205/code-review-graph

Answers questions about a past agent run from its recording, using causal graphs and replay, instead of reconstructing events from memory.

iflytek/skillhub

Diagnoses failing CI pipelines and tests, deciding first whether the test or the implementation is at fault, and hands hard cases to a dedicated fixer subagent.

Chachamaru127/claude-code-harness

Triages findings from a Strix pentest by severity, fixes each root cause with a minimal change, and re-runs Strix to confirm the exploit no longer works.

usestrix/strix

Investigates TiDB plan or test-result diffs that the change does not explain, ruling out failpoint setup and merge effects before expected outputs are updated.

pingcap/tidb

Diagnoses surprising LoopX behavior, such as stale recommendations or tiny progress, assigns it to the responsible layer and repairs it at the lowest durable level.

loopx-project/loopx

Guided reverse engineering workflow for binaries, firmware, mobile apps, scripts, document samples, protocol captures, and unknown artifacts.

lingbol088-spec/reverse-flow-skill

Fix or implement a tracker issue end to end from a single command — takes an issue id or a plain problem description (filed first via om-prepare-issue), classifies, then drives the bug autofix chain…

go-musicfox/go-musicfox

Diagnoses where an agent failed across runs and turns the findings into new skills, system prompt patches and knowledge entries, using the A-Evolve loop.

aiming-lab/AutoResearchClaw

Applies a four-phase debugging routine that finds the root cause of a bug or failing test before any fix is written.

ChrisWiles/claude-code-showcase

Applies a stop-the-line rule and a step-by-step triage when tests fail, builds break or something stops working, aiming at the root cause instead of guesses.

addyosmani/agent-skills

Pushes an agent to keep verifying and changing approach after repeated failures, using a diagnosis line, evidence-based completion and confirmation before risky edits.

tanweai/pua

Investigates past Kubernetes incidents from Kubeshark traffic snapshots: takes captures, dissects API calls, extracts PCAPs and compares traffic over time.

kubeshark/kubeshark

Diagnoses a failed GreptimeDB fuzz CI job by pulling its GitHub Actions logs and fuzz artifacts, then matching the evidence to the local source code.

GreptimeTeam/greptimedb

Investigates a failed Opik end-to-end test from CI, TestOps or a local run, decides regression versus flake, and proposes a fix without editing tests.

comet-ml/opik

Master systematic debugging techniques, profiling tools, and root cause analysis to efficiently track down bugs across any codebase or technology stack.

sangrokjung/claude-forge

Debugging guide for Extempore covering its three layers, compilation paths, startup sequence and the batch, eval and interactive modes used to isolate JIT problems.

digego/extempore

Conduct evidence-backed Happier code, plan-completeness, session, worktree, feature, commit, branch, PR, codebase, and release-readiness reviews with affected-corridor analysis, high-confidence…

happier-dev/happier

Condensed debugging method and tool recipes for Unix, Python and PyTorch programs: crashes, hangs, segfaults, wrong output, CUDA OOM, NaN values and slowness.

stas00/the-art-of-debugging

A harness that makes Opus (or any Claude model) behave like Fable — it enforces seeing a task through to the end, with evidence and verification, as procedure.

fivetaku/fablize

Systematic evidence-based debugging using runtime logs. An agent skill from millionco/expect.

millionco/expect

Fixes an OpenROAD bug from a GitHub issue or error code: finds the root cause, implements the fix, adds a regression test and prepares a signed-off commit.

The-OpenROAD-Project/OpenROAD

A skill your agent uses when asked to run Design Error Detection (quick defect scan), find design errors in a Simulink model, perform root cause analysis on DED findings, fix division-by-zero…

matlab/simulink-agentic-toolkit

Write the canonical engineering record of a fixed bug — root cause, mechanism, fix, validation, and how it slipped through.

thananon/9arm-skills

Walks through open Sentry issues for the tooll3 project, latest first, proposing a fix for each and committing them one at a time with your review between.

tixl3d/tixl

A skill your agent uses when encountering any bug, test failure, or unexpected behavior, before proposing fixes - four-phase framework (root cause investigation, pattern analysis, hypothesis…

ed3dai/ed3d-plugins

Guides systematic root-cause debugging. An agent skill from abashev/vfs-s3.

abashev/vfs-s3

Run a structured after-action review (postmortem, retrospective) on a launch, incident, or completed project to capture timeline, root cause analysis, contributing factors, and actionable lessons.

rampstackco/claude-skills

Researches code with evidence: traces callers, imports and cross-repo links, diagnoses failures and reports findings with exact file and line references and a confidence label.

bgauryy/octocode

Triage failing GitHub PR checks: list failures with gh, fetch capped Actions logs, skip non-Actions checks, and summarize root cause.

Mentra-Community/MentraOS

Analyze MSBuild binary logs to diagnose build failures. An agent skill from microsoft/testfx.

microsoft/testfx

Parse and analyze Visual Studio TRX test result files. An agent skill from microsoft/vstest.

microsoft/vstest

矛盾分析法：把复杂问题拆成若干对立面，找出规定其他矛盾的主要矛盾及其主要方面，判定对抗性 / 非对抗性，并据此选择处理方式。当问题头绪多、多个因素互相牵制、优先级不清、根因不明、反复修不好、trade-off 说不清时触发；直接执行类任务或用户已定方案时不触发。

HughYau/qiushi-skill

After a bug is found, traces its root cause and feeds a new testable invariant back into the project spec so the bug class can't recur.

JuliusBrussee/cavekit

Forces a one-sentence, evidence-backed root cause before any fix is applied, and gates when a diagnosis session is even allowed to touch code.

tw93/Waza

A skill your agent uses for ANY bug, error, crash, wrong output, loss divergence, gradient explosion, test failure, CUDA error, distributed training hang, checkpoint load failure, or unexpected…

ByteDance-Seed/VeOmni

Investigates a service incident to its root cause by querying a UModel object graph alongside metrics, logs, topology and recent deployments.

alibaba/UnifiedModel

Investigate unexpected behavior and mysterious bugs. An agent skill from avibebuilder/claude-prime.

avibebuilder/claude-prime