Claude Code Skills·Claude Skills·The open SKILL.md registry for Claude
ClaudSkills / Engineering / testing

Finding Seams

Category: Engineering  ·  Sub-category: testing  ·  Last updated:
Use when existing code has untestable dependencies that prevent writing tests -- direct construction of collaborators, static or global function calls, tight coupling to external systems, or singleton access patterns. Specifically for identifying substitution points (seams) that make legacy or tightly-coupled code testable without editing at the call site. Do NOT use for greenfield TDD (see tdd), general test writing patterns (see testing), or refactoring already-tested code (see refactoring).
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

For writing tests that document existing behavior once you have seams, load the characterisation-tests skill. For test-driving new behavior, load the tdd skill. For general test patterns, load the testing skill. For refactoring after tests are in place, load the refactoring skill. Use codebase-design when deciding a module's lasting responsibility and caller-facing contract; this skill introduces the minimum enabling point needed to place existing behavior under test.

What this skill does

Finding Seams is a community-contributed Claude Code skill in the testing sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/finding-seams/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when existing code has untestable dependencies that prevent writing tests -- direct construction of collaborators, static or global function calls, tight coupling to external systems, or singleton access patterns. Specifically for identifying substitution points (seams) that make legacy or tightly-coupled code testable without editing at the call site.

Who uses this skill

The Finding Seams Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 186,000+ 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/finding-seams
curl -L https://claudskills.com/skills/finding-seams/SKILL.md \
  -o ~/.claude/skills/finding-seams/SKILL.md

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

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

Telegram

📱 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 Finding Seams Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/finding-seams/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Finding Seams skill do?
Use when existing code has untestable dependencies that prevent writing tests -- direct construction of collaborators, static or global function calls, tight coupling to external systems, or singleton access patterns. Specifically for identifying substitution points (seams) that make legacy or tightly-coupled code testable without editing at the call site. Do NOT use for greenfield TDD (see tdd), general test writing patterns (see testing), or refactoring already-tested code (see refactoring).
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 Finding Seams skill?
Use Finding Seams when your Claude Code task falls under the Engineering category — specifically in the testing 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 Finding Seams" or describe the task and let Claude pick). Browse related skills at /category/engineering/.
What is a Claude Code skill and how does the Finding Seams 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. Finding Seams is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

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

APA
juanibiapina. (2026). Finding Seams [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/finding-seams/
BibTeX
@misc{finding-seams-2026,
  author    = {juanibiapina},
  title     = {Finding Seams [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/finding-seams/}
}

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/finding-seams.svg)](https://claudskills.com/skills/finding-seams/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)
<script>
<script src="https://claudskills.com/embed/finding-seams.js" async></script>
<iframe>
<iframe src="https://claudskills.com/embed/finding-seams.html" width="100%" height="160" frameborder="0" loading="lazy" title="ClaudSkills: Finding Seams"></iframe>

Security scan

Grade A · scanned 2026-08-16 — 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 ›

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

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

Free. No spam. Unsubscribe in one click.

More Engineering skills

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

Browse all Engineering skills → Top 100 skills
Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills.  ·  What's New  ·  Install guide  ·  About  ·  llms.txt

Part of Acreator Store — Adam Lankamer's AI tools: PerfectStudio · Ucaption · UTagger · AutoXPoster · TestYourSkills · AutomationFlows · Au Naturel · Telegram @acreatorstore

Categories

Use cases

Popular tags

Learn

Site