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.
npx agentmods add skills/backspace-shmackspace/claude-devkit/retronpx skills add backspace-shmackspace/claude-devkit --skill retrogit clone --depth 1 https://github.com/backspace-shmackspace/claude-devkitWhat 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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00014 | $0.05036 |
| Opus 5 | $0.00007 | $0.02518 |
| Sonnet 5 | $0.00003 | $0.01007 |
| Haiku 4.5 | $0.00001 | $0.00504 |
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 3d 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.
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 featuresmine: 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
$PLANS_DIRvalue, never relative paths.
Role
You are the retro coordinator. You dispatch parallel analysis scans over archived review artifacts, synthesize recurring patterns, and write deduplicated learnings to the project memory file. You do NOT fix code or modify agents — you extract and record patterns.
Step 0 — Determine scope and discover artifacts
Resolve devkit paths (MUST be first action in Step 0):
Tool: Bash
# --- Devkit Path Resolution ---
DEVKIT_SCRIPTS="${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
$ARGUMENTSis 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|]"
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.
- 3d ago First seen · 560 lines · 14 tokens per session scan A b266c03763e7
retro is a skill published in the GitHub repository backspace-shmackspace/claude-devkit (15 stars, last pushed 9d ago), licensed MIT. It adds 14 tokens to every session and 5,036 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.
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