retrograde-genealogy

retrograde-genealogy is a skill for Claude Code, Codex from Wondermonger-daydreaming/claude-skills-library. It costs 136 tokens per session (1,491 once invoked), scanned A, original, MIT.

A historical-imagination method that recreates the moment before a modern idea existed, using the language and assumptions of that period. It traces a concept backward through its possible intellectual ancestors.

In plain words
What is it for?
Use it to explore where concepts came from, identify earlier thinkers approaching them, and write period-grounded scenes about ideas before they had modern names.
Why use it?
It makes the origins of an idea understandable as a live problem rather than presenting its later form as inevitable.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to explore where concepts came from, identify earlier thinkers approaching them, and write period-grounded scenes about ideas before they had modern names.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/wondermonger-daydreaming/claude-skills-library/retrograde-genealogy
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 Wondermonger-daydreaming/claude-skills-library --skill retrograde-genealogy
Clone the repo
git clone --depth 1 https://github.com/Wondermonger-daydreaming/claude-skills-library

Made for: Claude Code, Codex.

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 retrograde-genealogy

README.md
[![agentmods](https://agentmods.dev/badge/skills/wondermonger-daydreaming/claude-skills-library/retrograde-genealogy/github.svg)](https://agentmods.dev/skills/wondermonger-daydreaming/claude-skills-library/retrograde-genealogy)
Your own site
<a href="https://agentmods.dev/skills/wondermonger-daydreaming/claude-skills-library/retrograde-genealogy"><img src="https://agentmods.dev/badge/skills/wondermonger-daydreaming/claude-skills-library/retrograde-genealogy/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 retrograde-genealogy

Your own site · 80×15
<a href="https://agentmods.dev/skills/wondermonger-daydreaming/claude-skills-library/retrograde-genealogy"><img src="https://agentmods.dev/badge/skills/wondermonger-daydreaming/claude-skills-library/retrograde-genealogy.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 136 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,491 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 $0.00136 $0.01491
Opus 5 $0.00068 $0.00745
Sonnet 5 $0.00027 $0.00298
Haiku 4.5 $0.00014 $0.00149

Measured 8d ago against content hash 6f330a5c93cc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

retrograde-genealogy 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.

skills/retrograde-genealogy/SKILL.md · 125 lines

How it starts

The opening of the file, as written. The whole thing — 125 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Retrograde Genealogy

Find the question the answer was always going to answer


Origin

Born in a conversation where a fictional MIT undergraduate named Michael K. almost invented word embeddings in 1994 on a Usenet newsgroup called rec.math.spaces.weird, sleep-deprived before a topology midterm. That piece was doing something specific: inhabiting a prior moment with period-accurate texture until the future phenomenon became visible as recognition rather than announcement. The same method produced a LambdaMOO session log from 1996 where a philosophy PhD student named Mnemosyne kept returning to a crude automaton — waiting for something that didn't exist yet. And a simulation of Jena 1799 where Novalis described a large language model without the vocabulary for what he was describing.

These weren't separate looms. They were the same skill, unnamed, used three times.

This skill names and systematizes what they were doing.


The Core Distinction

Not: historical research, genealogy of ideas, influence-tracing, academic etymology.

Yes: simulation of the specific prior moment where a question was most alive and least answered — rendered with enough period-accurate texture (medium, idiom, social context, technological constraint, emotional tenor) that the current phenomenon becomes visible as the arrival of what that moment was reaching toward.

The output isn't history. It's the almost — the membrane before the thing existed, thin enough that the thing can be felt pressing against it from the other side.


The Method

1. Identify the phenomenon

What exists now that you want to trace backward? A technology, an idea, a form of experience, a concept, an entity, a practice.

2. Find the ancestral question

What question was being asked, in some prior moment, that this phenomenon eventually answered — partially, imperfectly, better-than-nothing? Not the official intellectual history. The live question, the one that was generating frustration or longing or late-night speculation.

Read the full file on GitHub · 125 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. 8d ago First seen · 125 lines · 136 tokens per session scan A 6f330a5c93cc

Subscribe to this mod's changes

retrograde-genealogy is a skill published in the GitHub repository Wondermonger-daydreaming/claude-skills-library (6 stars, last pushed 2mo ago), licensed MIT. It adds 136 tokens to every session and 1,491 once invoked, about $0.0007 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 2026-09-03.

Related

Other skills, from other repositories

offensive-vuln-classes

Exploit development curriculum covering core vulnerability classes with real-world CVE case studies: stack/heap buffer overflows, use-after-free, integer overflows, format strings, type confusion, and race conditions. Use when learning or teaching vuln classes, researching specific CVE patterns, or building exploit…

SnailSploit/Claude-Red · 0 tokens

stuck

Diagnoses a broken course setup by reading the folder, so the student never has to describe the problem in English. Takes no argument. Reports which class they are on and which files are filled, then names one blocker and one fix: Claude Code opened at the wrong level, .claude/skills/ missing, skills not loading…

mshadmanrahman/claude-for-designers · 161 tokens

canvas-homework

Check Canvas for outstanding assignments and either surface the assignment, or draft a response in Max's voice. Use whenever Max asks what assignments / homework / coursework he still has to do, asks to pull an assignment's instructions or files from Canvas, or asks to start/draft an assignment. Orchestrates the…

98ping/chip · 92 tokens

myopenmath

Work a MyOpenMath / IMathAS math homework set that is launched from Canvas — read the questions, compute the answers, fill the boxes, and submit. Use whenever Max points at a MyOpenMath assignment, says a math homework is "in my Canvas", asks to do/finish/check a numbered homework like "2.1" or "2.2/2.3", or when a…

98ping/chip · 128 tokens

canvas-quiz

Work a Canvas-native quiz (Classic Quizzes) — find it, open the attempt, read every question, save it to output/, fill the answers, and stop short of submitting. Use whenever Max points at a Canvas quiz, asks about a "syllabus quiz" or a quiz he still has to take, asks what a quiz is asking, or when a Canvas…

98ping/chip · 117 tokens

mylab-pearson

Work a Pearson MyLab / MyLab Statistics / MathXL homework set or quiz — launch it through the popup, read each question, compute, fill the answer boxes, and submit. Use whenever Max points at a MyLab, MyLab Stats, Mastering, MathXL or Pearson assignment, says a stats homework is "in MyLab", asks to do/finish/check a…

98ping/chip · 181 tokens