proof-theory

proof-theory is a skill for Claude Code from parcadei/Continuous-Claude-v3. It costs 13 tokens per session (472 once invoked), scanned A, original, MIT.

A guide to proof theory, the study of how formal mathematical proofs are structured, checked, and simplified.

In plain words
What is it for?
Use it for direct, contradiction, case-based, and inductive proofs, as well as soundness, completeness, cut elimination, and proof checking.
Why use it?
It helps choose a proof method and verify that each step follows from the stated rules and assumptions.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: reads .claude/ paths.

Good fit Use it for direct, contradiction, case-based, and inductive proofs, as well as soundness, completeness, cut elimination, and proof checking.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/parcadei/continuous-claude-v3/proof-theory
About the project

Continuous-Claude-v3 is a Claude Code development environment that preserves working context between sessions, coordinates specialized agents, and stores project knowledge through ledgers, handoffs, and analysis tools. It is for people using Claude Code on ongoing or complex software work. Its catalogue entries are the skills, agents, hooks, plugin, and setting that provide its workflows and orchestration.

parcadei/Continuous-Claude-v3 · 3,938 stars · on GitHub

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add parcadei/Continuous-Claude-v3 --skill proof-theory
Clone the repo
git clone --depth 1 https://github.com/parcadei/Continuous-Claude-v3

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for proof-theory

README.md
[![agentmods](https://agentmods.dev/badge/skills/parcadei/continuous-claude-v3/proof-theory/github.svg)](https://agentmods.dev/skills/parcadei/continuous-claude-v3/proof-theory)
Your own site
<a href="https://agentmods.dev/skills/parcadei/continuous-claude-v3/proof-theory"><img src="https://agentmods.dev/badge/skills/parcadei/continuous-claude-v3/proof-theory/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for proof-theory

Your own site · 80×15
<a href="https://agentmods.dev/skills/parcadei/continuous-claude-v3/proof-theory"><img src="https://agentmods.dev/badge/skills/parcadei/continuous-claude-v3/proof-theory.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 472 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Agent Snooping · line 68
    Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.
    Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00013 $0.00472
Opus 5 $0.00006 $0.00236
Sonnet 5 $0.00003 $0.00094
Haiku 4.5 $0.00001 $0.00047

Measured 9d ago against content hash 1d7934275065, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

proof-theory scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/math/mathematical-logic/proof-theory/SKILL.md · 69 lines

What it actually says

Proof Theory

When to Use

Use this skill when working on proof-theory problems in mathematical logic.

Decision Tree

  1. Proof Strategy Selection

    • Direct proof: assume premises, derive conclusion
    • Proof by contradiction: assume negation, derive false
    • Proof by cases: split on disjunction
    • Induction: base case + inductive step
  2. Structural Induction

    • Define well-founded ordering on structures
    • Base: prove for minimal elements
    • Step: assume for smaller, prove for current
    • z3_solve.py prove "induction_principle"
  3. Cut Elimination

    • Gentzen's Hauptsatz: cuts can be eliminated
    • Subformula property: only subformulas appear
    • Useful for proof normalization
  4. Completeness/Soundness Check

    • Soundness: if provable then valid
    • Completeness: if valid then provable
    • z3_solve.py prove "soundness_theorem"
  5. Proof Verification

    • Check each step follows from rules
    • Verify dependencies are satisfied
    • math_scratchpad.py verify "proof_steps"

Tool Commands

Z3_Induction_Base

uv run python -m runtime.harness scripts/cc_math/z3_solve.py prove "P(0)"

Z3_Induction_Step

uv run python -m runtime.harness scripts/cc_math/z3_solve.py prove "ForAll([n], Implies(P(n), P(n+1)))"

Z3_Soundness

uv run python -m runtime.harness scripts/cc_math/z3_solve.py prove "Implies(derivable(phi), valid(phi))"

Math_Verify

uv run python -m runtime.harness scripts/cc_math/math_scratchpad.py verify "proof_structure"

Cognitive Tools Reference

See .claude/skills/math-mode/SKILL.md for full tool documentation.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 9d ago First seen · 69 lines · 13 tokens per session scan A 1d7934275065

Subscribe to this mod's changes

proof-theory is a skill published in the GitHub repository parcadei/Continuous-Claude-v3 (3,938 stars, last pushed 7mo ago), licensed MIT. It adds 13 tokens to every session and 472 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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