What is python-scala-idioms?

A guide to common Scala coding conventions, including naming, error handling, pattern matching, and string formatting.

Use it when writing or reviewing Scala classes, functions, errors, and pattern-matching code.

It helps Python developers write Scala code in the style expected by Scala projects and avoid confusing translations.

python-scala-idioms — Skill for Claude Code and Codex by cxcscmu

Install

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.

Any agent

npx skills add cxcscmu/SkillLearnBench --skill python-scala-idioms

Clone the repo

git clone --depth 1 https://github.com/cxcscmu/SkillLearnBench

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/cxcscmu/skilllearnbench/python-scala-idioms.svg)](https://agentmods.dev/skills/cxcscmu/skilllearnbench/python-scala-idioms)

Your own site

<a href="https://agentmods.dev/skills/cxcscmu/skilllearnbench/python-scala-idioms"><img src="https://agentmods.dev/badge/skills/cxcscmu/skilllearnbench/python-scala-idioms.svg" alt="Measured on agentmods" height="20"></a>

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 299 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00024	$0.00299
Opus 5	$0.00012	$0.00150
Sonnet 5	$0.00005	$0.00060
Haiku 4.5	$0.00002	$0.00030

Measured 3d ago against content hash 5309a89083fe, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

python-scala-idioms 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 3d 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.

skills/b1-one-shot-claude-opus-4-6/python-scala-translation/python-scala-idioms/SKILL.md · 46 lines

What it actually says

Scala Idioms and Conventions

Naming Conventions

Classes/Traits: PascalCase
Methods/Fields: camelCase (not snake_case)
Constants: PascalCase in companion objects or UPPER_CASE for enum-like
Package: lowercase
Type parameters: single uppercase letter T, A, B

Error Handling

// Python: raise ValueError -> Scala: throw or Either/Try
// Prefer Option for absence, Either/Try for errors
def tokenizePath(value: Json, path: String): Option[Token]

Pattern Matching (replaces isinstance chains)

// Python: if isinstance(value, str): ...
// Scala:
value match {
  case s: String => ...
  case i: Int    => ...
  case _         => ...
}

String Interpolation

// Python: f"{value:.6f}" -> Scala: f"$value%.6f" or s"$value"

Companion Objects

// Factory methods, constants go in companion objects
object TemporalTokenizer {
  val IsoFormat = "yyyy-MM-dd'T'HH:mm:ss"
  val DateFormat = "yyyy-MM-dd"
}

Changes

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.

3d ago First seen · 46 lines · 24 tokens per session scan A 5309a89083fe

Subscribe to this mod's changes

python-scala-idioms is a skill published in the GitHub repository cxcscmu/SkillLearnBench (83 stars, last pushed 1mo ago), licensed MIT. It adds 24 tokens to every session and 299 once invoked, about $0.0001 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 2026-09-03.

Languages agent-skills automatic benchmark continual-learning skill-generation

hotpath_init

Configure hotpath profiling in a Rust project. Adds the hotpath dependency with feature-gated setup, instruments main with hotpath::main, functions with measure/measureall, and wraps channels, mutexes, rwlocks, streams, futures, reqwest clients, axum routers and byte-level I/O with hotpath macros. Use when the user…

pawurb/hotpath-rs · 88 tokens

rdkit

Cheminformatics toolkit for fine-grained molecular control. SMILES/SDF parsing, descriptors (MW, LogP, TPSA), fingerprints, substructure search, 2D/3D generation, similarity, reactions. For standard workflows with simpler interface, use datamol (wrapper around RDKit). Use rdkit for advanced control, custom…

benchflow-ai/skillsbench · 80 tokens

python-scala-idioms