rca-investigation

rca-investigation is a plugin for Claude Code from dmaynor/dmaynor-skills-marketplace. Its manifest loads nothing; the 1 skill it bundles cost 133 tokens per session together, scanned A, original, no licence file.

A root-cause analysis investigation skill for understanding why something failed. It uses failure categories, timelines, cause chains, and checks that corrective actions work.

In plain words
What is it for?
Investigating incidents and failures, reconstructing what happened, tracing contributing causes, and validating fixes.
Why use it?
It helps separate the underlying cause from symptoms before deciding what to change.

Plugin for Claude Code

Written for Claude Code: a Claude Code plugin manifest.

Good fit Investigating incidents and failures, reconstructing what happened, tracing contributing causes, and validating fixes.

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Install in Claude Code
/plugin marketplace add dmaynor/dmaynor-skills-marketplace/plugin install rca-investigation
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/dmaynor/dmaynor-skills-marketplace

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for rca-investigation

README.md
[![agentmods](https://agentmods.dev/badge/plugins/dmaynor/dmaynor-skills-marketplace/rca-investigation/github.svg)](https://agentmods.dev/plugins/dmaynor/dmaynor-skills-marketplace/rca-investigation)
Your own site
<a href="https://agentmods.dev/plugins/dmaynor/dmaynor-skills-marketplace/rca-investigation"><img src="https://agentmods.dev/badge/plugins/dmaynor/dmaynor-skills-marketplace/rca-investigation/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for rca-investigation

Your own site · 80×15
<a href="https://agentmods.dev/plugins/dmaynor/dmaynor-skills-marketplace/rca-investigation"><img src="https://agentmods.dev/badge/plugins/dmaynor/dmaynor-skills-marketplace/rca-investigation.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured The manifest loads nothing itself; its 1 skill cost 133 tokens a session between them.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Security

Grade A, and why

rca-investigation scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/rca-investigation/.claude-plugin/plugin.json · 11 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Contents

What it installs

The manifest is a name and a version. 1 skill travel with it, and installing the plugin installs all of them — 133 tokens a session between them. Each is measured on its own page, and each can be installed alone.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 11 lines scan A 13e5ab869d99

Subscribe to this mod's changes

rca-investigation is a plugin published in the GitHub repository dmaynor/dmaynor-skills-marketplace (5 stars, last pushed yesterday), with no licence file. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.