rca

rca is a command for Claude Code from rsts-dev/claude-buddy-marketplace. It costs 28 tokens per session (106 once invoked), scanned A, original, MIT.

A command for investigating the underlying cause of a bug or failure and proposing a change to the AI's project guidance.

In plain words
What is it for?
Analysing a failure and suggesting updates to CLAUDE.md or the project's .claude/context/ files.
Why use it?
It aims to prevent the same mistake from recurring, rather than only fixing the immediate incident.

Command for Claude Code

Written for Claude Code: argument-hint in frontmatter. Also seen: mentions CLAUDE.md.

Part of the sdlc plugin — 7 skills, 5 commands shipped together

Good fit Analysing a failure and suggesting updates to CLAUDE.md or the project's .claude/context/ files.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/rsts-dev/claude-buddy-marketplace/rca
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/rsts-dev/claude-buddy-marketplace

Made for: Claude Code.

Or install sdlc, the plugin that ships this one along with the rest of its 7 skills, 5 commands.

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

README.md
[![agentmods](https://agentmods.dev/badge/commands/rsts-dev/claude-buddy-marketplace/rca.svg)](https://agentmods.dev/commands/rsts-dev/claude-buddy-marketplace/rca)
Your own site
<a href="https://agentmods.dev/commands/rsts-dev/claude-buddy-marketplace/rca"><img src="https://agentmods.dev/badge/commands/rsts-dev/claude-buddy-marketplace/rca.svg" alt="Measured on agentmods" height="20"></a>
Per session 28 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 106 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00028 $0.00106
Opus 5 $0.00014 $0.00053
Sonnet 5 $0.00006 $0.00021
Haiku 4.5 $0.00003 $0.00011

Measured 8d ago against content hash 4b7fe8159602, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

rca 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 8d 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/sdlc/commands/rca.md · 11 lines

What it actually says

Read and execute the Rca skill at skills/Rca/SKILL.md.

User provided input: $ARGUMENTS

The output is not just a fix — it is a proposed change to CLAUDE.md or .claude/context/ so the system does not repeat the mistake.

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. 8d ago First seen · 11 lines · 28 tokens per session scan A 4b7fe8159602

Subscribe to this mod's changes

rca is a command published in the GitHub repository rsts-dev/claude-buddy-marketplace (17 stars, last pushed 17d ago), licensed MIT. It adds 28 tokens to every session and 106 once invoked, about $0.0001 per session on Opus 5. 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 2026-08-30.