Phase I Esa

Q: What is a Claude Code skill and how does the Phase I Esa 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. Phase I Esa 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: 2026-06-06

Drafts ASTM E1527-21 environmental site assessment reports under 40 CFR Part 312. Classifies RECs, CRECs, and HRECs to establish all appropriate inquiries for CERCLA liability protection. Trigger when the user requests a Phase I ESA, environmental site assessment, recognized environmental conditions analysis, ASTM E1527 compliance, or environmental due diligence for property transactions or lending.

About this skill (catalog notes)

Phase I Esa includes a dedicated installation section; pricing or quota commentary. At roughly 1,645 words the SKILL.md is on the longer end of the catalog distribution.

License: Apache-2.0
Original author: CaseMark
Indexed lastmod: 2026-06-06
Catalog position: General · general-misc
Indexed related skills: 10

How Phase I Esa fits the catalog

Phase I Esa 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

Drafts a Phase I ESA establishing "all appropriate inquiries" under ASTM E1527-21 and 40 CFR Part 312 for CERCLA liability protection. ASTM E1527-21 became EPA-recognized for AAI compliance on Feb 13, 2023; the prior E1527-13 lost AAI recognition on Feb 13, 2024 and is no longer compliant.

What this skill does

Phase I Esa 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/phase-i-esa/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Phase I Esa 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 93,000+ 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/phase-i-esa
curl -L https://claudskills.com/skills/phase-i-esa/SKILL.md \
  -o ~/.claude/skills/phase-i-esa/SKILL.md

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

Skills live at ~/.claude/skills/phase-i-esa/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\phase-i-esa\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 Phase I Esa Claude Code skill?

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

What does the Phase I Esa 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 Phase I Esa skill?

Use Phase I Esa 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 Phase I Esa" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Phase I Esa 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. Phase I Esa 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/.

Attribution & license

Source: https://github.com/ThomasMoreAI/legal-skills-open/blob/HEAD/us/environmental/skills/phase-i-esa/SKILL.md
License: Apache-2.0
Author: CaseMark

Cite this skill

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

APA

CaseMark. (2026). Phase I Esa [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/phase-i-esa/

BibTeX

@misc{phase-i-esa-2026,
  author    = {CaseMark},
  title     = {Phase I Esa [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/phase-i-esa/}
}

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