operational-semantics-builder
Define and test operational semantics specifications for programming languages
npx skills add a5c-ai/babysitter --skill operational-semantics-builder --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.
# Operational Semantics Builder ## Purpose Provides expert guidance on defining operational semantics for programming language specification and testing. ## Capabilities - Small-step semantics rule generation - Big-step semantics rule generation - Evaluation context definition - Substitution and binding handling - Semantics execution/testing - Equivalence proofs ## Usage Guidelines 1. **Semantics Style**: Choose small-step or big-step 2. **Rule Definition**: Define reduction/evaluation rules 3. **Contexts**: Define evaluation contexts if needed 4. **Testing**: Execute semantics on test programs 5. **Validation**: Verify expected behavior ## Tools/Libraries - PLT Redex - K Framework - Ott - Maude
- Purpose
- Capabilities
- Usage Guidelines
- Tools/Libraries
What does the operational-semantics-builder skill do?
Define and test operational semantics specifications for programming languages
How do I install it?
Run `npx skills add a5c-ai/babysitter --skill operational-semantics-builder --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 1,642 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.