REPL Development
Expert skill for building interactive REPLs with rich editing and evaluation features
npx skills add a5c-ai/babysitter --skill repl-development --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.
# REPL Development Skill ## Overview Expert skill for building interactive REPLs with rich editing and evaluation features. ## Capabilities - Implement readline integration with history - Handle multi-line input detection - Implement tab completion for identifiers - Design incremental compilation for REPL - Handle top-level expression evaluation - Implement persistent REPL state - Design pretty-printing for values - Support special REPL commands (:help, :type, etc.) ## Target Processes - repl-development.js - interpreter-implementation.js - lsp-server-implementation.js ## Dependencies - rustyline - readline libraries - linenoise ## Usage Guidelines 1. **Line Editing**: Use established readline libraries for robust line editing 2. **Multi-line**: Detect incomplete expressions for multi-line input 3. **Completion**: Implement context-aware tab completion 4. **History**: Persist history across sessions 5. **Commands**: Provide useful meta-commands (:help, :type, :quit, etc.) ## Output Schema ```json { "type": "object", "properties": { "lineLibrary": { "type": "string", "enum": ["readline", "rustyline", "linenoise", "custom"] }, "features": { "type": "array", "items": { "type": "string
- Overview
- Capabilities
- Target Processes
- Dependencies
- Usage Guidelines
- Output Schema
What does the REPL Development skill do?
Expert skill for building interactive REPLs with rich editing and evaluation features
How do I install it?
Run `npx skills add a5c-ai/babysitter --skill repl-development --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.