When you reach to modify code that has no ADR or spec, you're working blind: you don't know what the original author intended, what constraints were considered, or what behaviour the rest of the system depends on. /backfill-feature builds that picture before the change, so the change lands on solid ground.
Backfill Feature is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/backfill-feature/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when the user says "/backfill-feature", "backfill the ADR", "this feature has no ADR", "I need to document what's already there before I change it", or wants to capture an existing feature's architectural rationale and behaviour *before* modifying it. Reads the relevant code, drafts a reverse-engineered ADR (what is, why it probably looks like this) + Gherkin spec (current behaviour) + characterization tests that lock the current behaviour green.
The Backfill Feature Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. 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).
mkdir -p ~/.claude/skills/backfill-feature curl -L https://claudskills.com/skills/backfill-feature/SKILL.md \ -o ~/.claude/skills/backfill-feature/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/backfill-feature/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/backfill-feature/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\backfill-feature\SKILL.md on Windows. See the full install guide for step-by-step instructions.
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 →
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.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
SKILL.md from the source repository to ~/.claude/skills/backfill-feature/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.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. Backfill Feature is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{backfill-feature-2026,
author = {0xdeafcafe},
title = {Backfill Feature [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/backfill-feature/}
}Grade A · scanned 2026-06-13 — free static scan against the OWASP Agentic Skills Top 10.
No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›
Browse all General skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.