soundness-proof-assistant
Assist in constructing type soundness proofs using progress and preservation theorems
Profile →npx skills add a5c-ai/babysitter --skill soundness-proof-assistant --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Soundness Proof Assistant ## Purpose Provides expert guidance on constructing type soundness proofs for programming language type systems. ## Capabilities - Progress theorem proof templates - Preservation theorem proof templates - Substitution lemma generation - Canonical forms lemma derivation - Proof case enumeration - Mechanization guidance ## Usage Guidelines 1. **Lemma Identification**: Identify required supporting lemmas 2. **Progress Proof**: Prove progress theorem by cases 3. **Preservation Proof**: Prove preservation theorem 4. **Substitution Lemmas**: Prove substitution preserves typing 5. **Mechanization**: Translate to proof assistant ## Tools/Libraries - Coq - Agda - Lean - Twelf
- Purpose
- Capabilities
- Usage Guidelines
- Tools/Libraries
What does the soundness-proof-assistant skill do?
Assist in constructing type soundness proofs using progress and preservation theorems
How do I install it?
Run `npx skills add a5c-ai/babysitter --skill soundness-proof-assistant --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From a5c-ai/babysitter, a repository with 1,674 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.