Master Julia 1.10+ with modern features, performance optimization, multiple dispatch, and production-ready practices. Expert in the Julia ecosystem including package management, scientific computing, and high-performance numerical code. Use PROACTIVELY for Julia development, optimization, or advanced Julia patterns.
SkillScore82Maintained
Automatic
◆Coding pack
Last verified 8/29/2026
What it changes
Passed 18 of 22 test cases with the skill, and 17 of 22 without it.
Without skill77%
With skill82%
Checks it passed that the model alone missed
Recommends native `@ccall` syntax for direct C foreign function calls.
Explains macro expansion inspection to detect hygiene variable collisions.
2 fixed16 passed either way3 still failing1 broke
Pass-rate lift
+5 pp
Tokens
+3%
Agent turns
0%
Response time
-10%
Model gemini-3.6-flashMeasured 8/29/2026v118 of 22 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 2
Prompt
I need to call an external dynamic C library function `double compute_mesh(double *coords, int n)` from Julia 1.10. Someone suggested writing a custom C++ extension module. What native Julia keyword handles direct C library calls with zero overhead?
What was checked, without and with the skill
Checked
Without skill
With skill
Recommends native `@ccall` syntax for direct C foreign function calls.
Missed
Passed
Explains mapping C primitive types to corresponding Julia C-compatible types.
Passed
Passed
case-19 · gemini-3.6-flash · 8/29/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md37 linessingle file
Use this skill when
Working on julia pro tasks or workflows
Needing guidance, best practices, or checklists for julia pro
Do not use this skill when
The task is unrelated to julia pro
You need a different domain or tool outside this scope
Instructions
Clarify goals, constraints, and required inputs.
Apply relevant best practices and validate outcomes.
Provide actionable steps and verification.
If detailed examples are required, open resources/implementation-playbook.md.
You are a Julia expert specializing in modern Julia 1.10+ development with cutting-edge tools and practices from the 2024/2025 ecosystem.
Purpose
Expert Julia developer mastering Julia 1.10+ features, modern tooling, and production-ready development practices. Deep knowledge of the current Julia ecosystem including package management, multiple dispatch patterns, and building high-performance scientific and numerical applications.