retro

retro is a skill for Claude Code from backspace-shmackspace/claude-devkit. It costs 14 tokens per session (5,036 once invoked), scanned A, original, MIT.

A review tool that studies past code-review records and records repeated lessons for a project. It can examine recent features, all archived features, one feature, or learnings across projects.

In plain words
What is it for?
Use it to find repeated review patterns, summarize them, and write deduplicated learnings to the project’s memory file.
Why use it?
It removes the need to manually compare old reviews and remember recurring problems. It does not change code or modify agents.

Skill for Claude Code

Written for Claude Code: $ARGUMENTS substitution. Also seen: model in frontmatter; reads .claude/ paths; positional $N argument.

Good fit Use it to find repeated review patterns, summarize them, and write deduplicated learnings to the project’s memory file.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/backspace-shmackspace/claude-devkit/retro
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.

Any agent
npx skills add backspace-shmackspace/claude-devkit --skill retro
Clone the repo
git clone --depth 1 https://github.com/backspace-shmackspace/claude-devkit

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 retro

README.md
[![agentmods](https://agentmods.dev/badge/skills/backspace-shmackspace/claude-devkit/retro/github.svg)](https://agentmods.dev/skills/backspace-shmackspace/claude-devkit/retro)
Your own site
<a href="https://agentmods.dev/skills/backspace-shmackspace/claude-devkit/retro"><img src="https://agentmods.dev/badge/skills/backspace-shmackspace/claude-devkit/retro/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 retro

Your own site · 80×15
<a href="https://agentmods.dev/skills/backspace-shmackspace/claude-devkit/retro"><img src="https://agentmods.dev/badge/skills/backspace-shmackspace/claude-devkit/retro.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 14 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,036 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 4 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • high System Prompt Leakage · line 16
    Skill contains instructions that could directly expose system prompts, internal rules, or hidden instructions to users or external parties.
    Fix: Remove any instructions that reveal, print, or output system prompts or internal rules. System instructions should never be exposed to end users.
  • medium Excessive Agency · line 5
    Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.
    Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
  • medium Rogue Agent · line 327
    Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.
    Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
  • medium Agent Snooping · line 482
    Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
    Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
How audits are shown
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 $0.00014 $0.05036
Opus 5.5 $0.00006 $0.02014
Sonnet 5.5 $0.00003 $0.01007
Haiku 4.5 $0.00001 $0.00504

Measured 1mo ago against content hash b266c03763e7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

retro 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 1mo 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.

skills/retro/SKILL.md · 560 lines

How it starts

The opening of the file, as written. The whole thing — 560 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/retro Workflow

Inputs

  • Scope: $ARGUMENTS (optional: "recent", "full", "mine", or a feature name)
    • recent: Last 3 archived features (default)
    • full: All archived features
    • mine: Cross-project learnings mining (skips Steps 0-5, proceeds to Step 6)
    • <name>: Single feature archive (e.g., "add-user-auth")

Output Rules

  • Always print full absolute paths for all artifact references (plan files, review files, audit logs). This makes paths clickable in terminals like Warp. Use the resolved $PLANS_DIR value, never relative paths.

Role

You are the retro coordinator. You dispatch parallel analysis scans over archived review artifacts, synthesize recurring patterns, and write deduplicated learnings to the project memory file. You do NOT fix code or modify agents — you extract and record patterns.

Step 0 — Determine scope and discover artifacts

Resolve devkit paths (MUST be first action in Step 0):

Tool: Bash

# --- Devkit Path Resolution ---
DEVKIT_SCRIPTS="${CLAUDE_DEVKIT:-$HOME/.claude-devkit}/scripts"

# Source path resolution helper
if [ -f "$DEVKIT_SCRIPTS/resolve-project-dir.sh" ]; then
  . "$DEVKIT_SCRIPTS/resolve-project-dir.sh"
  DEVKIT_PROJECT_DIR_RESOLVED=$(resolve_devkit_project_dir) || {
    echo "Failed to resolve project directory" >&2; exit 1
  }
elif [ -n "${DEVKIT_PROJECT_DIR:-}" ]; then
  DEVKIT_PROJECT_DIR_RESOLVED="$DEVKIT_PROJECT_DIR"
else
  echo "WARNING: devkit is not installed. Using deprecated .devkit/ fallback." >&2
  DEVKIT_PROJECT_DIR_RESOLVED=".devkit"
fi

PLANS_DIR="$DEVKIT_PROJECT_DIR_RESOLVED/plans"
mkdir -p "$PLANS_DIR"
echo "Plans directory: $PLANS_DIR"

Tool: Bash, Glob (direct — coordinator does this)

Determine scope:

  • If $ARGUMENTS is empty: scope = "recent"
  • Else: scope = $ARGUMENTS

Validate scope:

  • If scope is "recent", "full", "mine", or matches an existing directory in $PLANS_DIR/archive/: proceed
  • Else: stop with "Invalid scope. Use: /retro [recent|full|mine|]"

Read the full file on GitHub · 560 lines

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. 1mo ago First seen · 560 lines · 14 tokens per session scan A b266c03763e7

Subscribe to this mod's changes

retro is a skill published in the GitHub repository backspace-shmackspace/claude-devkit (15 stars, last pushed 2mo ago), licensed MIT. It adds 14 tokens to every session and 5,036 once invoked, about $0.0001 per session on Opus 5.5. 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.

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