JIT Compilation
Expert skill for just-in-time compilation including profiling, tiered compilation, and deoptimization
npx skills add a5c-ai/babysitter --skill jit-compilation --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.
# JIT Compilation Skill ## Overview Expert skill for just-in-time compilation including profiling, tiered compilation, and deoptimization. ## Capabilities - Implement execution profiling and hot path detection - Design tiered compilation strategies (baseline + optimizing) - Implement on-stack replacement (OSR) - Implement speculative optimizations with guards - Design deoptimization frame reconstruction - Implement inline caching and type feedback - Design code cache management and eviction - Implement method inlining heuristics ## Target Processes - jit-compiler-development.js - bytecode-vm-implementation.js - interpreter-implementation.js ## Dependencies V8/HotSpot architecture references ## Usage Guidelines 1. **Tiered Approach**: Start with a baseline tier, add optimizing tier when profiling data is available 2. **Profile-Guided**: Use profiling data to guide optimization decisions 3. **Speculation**: Implement guards for speculative optimizations with clean deoptimization 4. **OSR**: Implement OSR for long-running loops to benefit from optimization mid-execution 5. **Code Cache**: Implement code cache management to handle memory pressure ## Output Schema ```json { "type": "obj
- Overview
- Capabilities
- Target Processes
- Dependencies
- Usage Guidelines
- Output Schema
What does the JIT Compilation skill do?
Expert skill for just-in-time compilation including profiling, tiered compilation, and deoptimization
How do I install it?
Run `npx skills add a5c-ai/babysitter --skill jit-compilation --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.