Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Krastanov/JuliaLLMAgentSkills --skill build-julia-interfacesgit clone --depth 1 https://github.com/Krastanov/JuliaLLMAgentSkillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/krastanov/juliallmagentskills/build-julia-interfaces)<a href="https://agentmods.dev/skills/krastanov/juliallmagentskills/build-julia-interfaces"><img src="https://agentmods.dev/badge/skills/krastanov/juliallmagentskills/build-julia-interfaces/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/krastanov/juliallmagentskills/build-julia-interfaces"><img src="https://agentmods.dev/badge/skills/krastanov/juliallmagentskills/build-julia-interfaces.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00096 | $0.00557 |
| Opus 5 | $0.00048 | $0.00279 |
| Sonnet 5 | $0.00019 | $0.00111 |
| Haiku 4.5 | $0.00010 | $0.00056 |
Grade A, and why
build-julia-interfaces scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Build Julia Interfaces
Start with the smallest interface that meets the user-facing contract. Keep domain logic in ordinary functions and make each interface a thin adapter.
Route the Task
- Choose between a script, Base
@main, experimental Pkg apps, and Comonicon: read references/cli.md. - Add styled terminal output, progress, or a Term live application: read references/term.md.
- Extend Makie with a type conversion or full plot recipe: read references/makie-recipes.md.
- Test argument handling, rendered output, live layouts, or recipes: read references/testing.md.
Open only the references required by the task.
Apply These Defaults
- For one small command, use a plain Julia function plus Base
@mainon Julia 1.11+. - Use a Pkg app only on Julia 1.12+ when package installation is part of the requirement and the project accepts that Pkg app support is currently experimental.
- Add a CLI framework only for meaningful parsing, help, completion, or subcommand needs. Keep Comonicon for compatible existing projects; do not make it the default.
- Use plain text first, Term renderables second, and a Term live app only when keyboard interaction or continuously updated layout is required.
- Use PrettyTables, via
handle-julia-data, for ordinary tabular reports. UseTerm.Tables.Tableonly inside a Term composition. - Target Makie 0.24's ComputeGraph for new reactive recipes. Do not copy pre-0.24 Observable mutation patterns into new code.
- Test pure interface logic with explicit argument vectors and
IOBuffers. Avoid elaborate mocks; add a small end-to-end smoke test only where the installed command contract matters.
For Cmd, environment, pipeline, process-I/O, deadlock, task, or thread details, use
orchestrate-julia-workloads, especially its references/commands-and-processes.md file.
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 42 lines · 96 tokens per session scan A 5fdfa30f4ef1
build-julia-interfaces is a skill published in the GitHub repository Krastanov/JuliaLLMAgentSkills (30 stars, last pushed 1mo ago), licensed Unlicense. It adds 96 tokens to every session and 557 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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