Predicate Logic

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

Category: Content · Sub-category: translation · Last updated: 2026-05-21

First-order logic with quantifiers, predicates, functions, and identity. Covers syntax, interpretation over a domain, the universal and existential quantifiers, quantifier scope and binding, translation from natural language with multi-variable predicates, natural deduction for quantifiers, undecidability at first order, and the soundness/completeness theorems. Use when propositional logic is insufficient -- whenever "for all" or "there exists" matters to the argument.

About this skill (catalog notes)

Predicate Logic includes explicit scope boundaries (an explicit 'when not to use' or 'out of scope' section); at least one code block. At roughly 1,725 words the SKILL.md is on the longer end of the catalog distribution.

Original author: julio211916
Indexed lastmod: 2026-05-21
Catalog position: Content · translation
Indexed related skills: 10

How Predicate Logic fits the catalog

Predicate Logic sits in the Content category under the translation 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

Predicate logic -- also called first-order logic (FOL) or quantificational logic -- extends propositional logic with the machinery of quantification. Where propositional logic can express "Socrates is mortal" as an atomic sentence, predicate logic can express "every man is mortal" as ∀x (Man(x) → Mortal(x)) and then actually derive "Socrates is mortal" from it. This expressive jump is what allows logic to capture mathematical reasoning, natural-language quantifier interactions, and the semantics of programming languages. This skill covers the syntax, semantics, proof theory, and translation…

What this skill does

Predicate Logic is a community-contributed Claude Code skill in the translation sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/predicate-logic/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when propositional logic is insufficient -- whenever "for all" or "there exists" matters to the argument.

Who uses this skill

The Predicate Logic Claude Code skill is built for content creators, marketers, copywriters, SEO professionals, and editorial teams. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 116,000+ 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/predicate-logic
curl -L https://claudskills.com/skills/predicate-logic/SKILL.md \
  -o ~/.claude/skills/predicate-logic/SKILL.md

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

Skills live at ~/.claude/skills/predicate-logic/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\predicate-logic\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 Predicate Logic Claude Code skill?

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

What does the Predicate Logic 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 Predicate Logic skill?

Use Predicate Logic when your Claude Code task falls under the Content category — specifically in the translation 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 Predicate Logic" or describe the task and let Claude pick). Browse related skills at /category/content/.

What is a Claude Code skill and how does the Predicate Logic 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. Predicate Logic is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Content category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/julio211916/TlantiCAD-Studio-V0.1-alpha/blob/HEAD/skills/predicate-logic/SKILL.md
Author: julio211916

Cite this skill

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

APA

julio211916. (2026). Predicate Logic [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/predicate-logic/

BibTeX

@misc{predicate-logic-2026,
  author    = {julio211916},
  title     = {Predicate Logic [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/predicate-logic/}
}

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