ClaudSkills / Science & Research / science-misc

Overgraft Engine

Q: What is a Claude Code skill and how does the Overgraft Engine skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Overgraft Engine is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Science & Research · Sub-category: science-misc · Last updated: 2026-06-01

type:review

Autonomous system improvement engine. Evaluates agent harness, skills, and memory against measurable baselines, proposes bounded experiments, runs them, and keeps or discards changes based on score. Combines autoagent's hill-climbing discipline, hermes-agent's background memory curation, and AI-Scientist-v2's best-first tree search exploration. USE WHEN: running improvement experiments on skills or agents, evaluating system performance against baselines, reviewing memory health, inspecting the experiment ledger, or identifying dead weight for removal. Triggers on: "overgraft", "improve the system", "run an experiment", "evaluate baselines", "shed dead weight", "review memory health", "experiment ledger".

Security BStatic scan: minor findingsHow grading works ›

About this skill (catalog notes)

Overgraft Engine includes pricing or quota commentary; at least one code block. At roughly 3,468 words the SKILL.md is on the longer end of the catalog distribution.

Original author: MARPA Design Studios / GRAFTKIT
Indexed lastmod: 2026-06-01
Catalog position: Science & Research · science-misc
Indexed related skills: 10

How Overgraft Engine fits the catalog

Overgraft Engine sits in the Science & Research category under the science-misc sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

The Overgraft Engine is the system improvement protocol for GRAFTKIT. It synthesizes three research-validated patterns into a single coherent loop:

What this skill does

Overgraft Engine is a community-contributed Claude Code skill in the science-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/overgraft-engine/ and loads when your prompt matches the skill's trigger.

When to invoke it: USE WHEN: running improvement experiments on skills or agents, evaluating system performance against baselines, reviewing memory health, inspecting the experiment ledger, or identifying dead weight for removal. Triggers on: "overgraft", "improve the system", "run an experiment", "evaluate baselines", "shed dead weight", "review memory health", "experiment ledger".

Who uses this skill

The Overgraft Engine Claude Code skill is built for researchers, data scientists, academics, and analysts working with complex data and scientific literature. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 115,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/overgraft-engine
curl -L https://claudskills.com/skills/overgraft-engine/SKILL.md \
  -o ~/.claude/skills/overgraft-engine/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/overgraft-engine/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/overgraft-engine/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\overgraft-engine\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Overgraft Engine Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/overgraft-engine/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Overgraft Engine skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Overgraft Engine skill?

Use Overgraft Engine when your Claude Code task falls under the Science & Research category — specifically in the science misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Overgraft Engine" or describe the task and let Claude pick). Browse related skills at /category/science/.

What is a Claude Code skill and how does the Overgraft Engine skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Overgraft Engine is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://gist.githubusercontent.com/JeromyJSmith/bb4686da3ca32cf11aaad7b1e308e5e4/raw/8dcfd0ceef6d1831b3e07e556e228177d3a73a72/SKILL.md
Author: MARPA Design Studios / GRAFTKIT

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

MARPA Design Studios / GRAFTKIT. (2026). Overgraft Engine [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/overgraft-engine/

BibTeX

@misc{overgraft-engine-2026,
  author    = {MARPA Design Studios / GRAFTKIT},
  title     = {Overgraft Engine [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/overgraft-engine/}
}

Embed this skill

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Badge

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Security scan

Grade B · scanned 2026-06-13 — free static scan against the OWASP Agentic Skills Top 10.

The scan flagged 2 of 10 categories (data-exfil, prompt-injection), including a high-severity pattern. Patterns shown inside code fences are weighted as examples rather than instructions — read the grading methodology for what this does and does not guarantee.

⚠ Prompt injection
⚠ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: B](https://img.shields.io/badge/Security-B-558b2f)](https://claudskills.com/skills/overgraft-engine/#security)

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Browse all Science & Research skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Science & Research skills → Top 100 skills

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