Behavioral Equivalence

Q: What is a Claude Code skill and how does the Behavioral Equivalence 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. Behavioral Equivalence is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: General · Sub-category: general-misc · Last updated: 2026-05-21

Proves the new stack output is identical to the old stack output across four techniques — shadow mode, contract snapshots, differential fuzzing, and database read equivalence — before traffic is permanently cut over.

Security AStatic scan found no risk patternsHow grading works ›

About this skill (catalog notes)

Behavioral Equivalence includes pricing or quota commentary. At roughly 4,751 words the SKILL.md is on the longer end of the catalog distribution.

Indexed lastmod: 2026-05-21
Catalog position: General · general-misc
Indexed related skills: 10

How Behavioral Equivalence fits the catalog

Behavioral Equivalence sits in the General category under the general-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

This skill systematically proves that the new stack produces identical outputs to the old stack for all meaningful inputs before any traffic is permanently cut over. "Identical" is defined precisely: same HTTP status codes, same response body shapes (including field order in JSON arrays), same response headers excluding instrumentation-only headers, and same database state after the same mutation inputs. Four complementary techniques are applied in combination, because no single technique provides complete coverage: shadow mode exercises real production traffic but is biased toward happy…

What this skill does

Behavioral Equivalence 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/behavioral-equivalence/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Behavioral Equivalence 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).

How to install

Free

Manual install (2 steps)

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

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

Skills live at ~/.claude/skills/behavioral-equivalence/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\behavioral-equivalence\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 Behavioral Equivalence Claude Code skill?

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

What does the Behavioral Equivalence 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 Behavioral Equivalence skill?

Use Behavioral Equivalence when your Claude Code task falls under the General category — specifically in the general 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 Behavioral Equivalence" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Behavioral Equivalence 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. Behavioral Equivalence 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/.

Cite this skill

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

APA

ClaudSkills. (2026). Behavioral Equivalence [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/behavioral-equivalence/

BibTeX

@misc{behavioral-equivalence-2026,
  author    = {ClaudSkills},
  title     = {Behavioral Equivalence [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/behavioral-equivalence/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/behavioral-equivalence.svg)](https://claudskills.com/skills/behavioral-equivalence/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

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 ›

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

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

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/behavioral-equivalence/#security)

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

Browse all General skills → Top 100 skills

Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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