scala-lsp: Instructions file for Claude Code

CLAUDE.md

scala-lsp CLAUDE.md is an instructions file for Claude Code from zircote/scala-lsp. It costs 192 tokens per session, scanned A, original, MIT.

A project guide for a Claude Code plugin that adds Scala support through Metals, a Scala language server. It explains setup, important files, automated checks, and coding conventions.

In plain words
What is it for?
Use it to install Metals, Scalafmt, and Scalafix; configure language-server support; maintain formatting, linting, and build hooks; and follow the project’s Scala style.
Why use it?
It tells a coding agent how this plugin is organised and which tools it expects, reducing setup mistakes and unnecessary changes.

Instructions file for Claude Code

Written for Claude Code: Claude Code plugin machinery. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is zircote/scala-lsp's own configuration. It tells Claude Code how to work on scala-lsp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything scala-lsp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to zircote/scala-lsp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/zircote/scala-lsp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/zircote/scala-lsp

Made for: Claude Code.

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.

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README.md
[![agentmods](https://agentmods.dev/badge/instructions/zircote/scala-lsp/claude-md.svg)](https://agentmods.dev/instructions/zircote/scala-lsp/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/zircote/scala-lsp/claude-md"><img src="https://agentmods.dev/badge/instructions/zircote/scala-lsp/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 192 This file is loaded in full into every session.
When invoked 192 The same file — it is already loaded in full.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00192 $0.00192
Opus 5 $0.00096 $0.00096
Sonnet 5 $0.00038 $0.00038
Haiku 4.5 $0.00019 $0.00019

Measured 6d ago against content hash 723d04b0b4e5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

scala-lsp CLAUDE.md 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 6d 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.

CLAUDE.md · 33 lines

What it actually says

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

A Claude Code plugin providing Scala development support through Metals LSP integration and automated hooks for formatting, linting, and building.

Setup

Run /setup to install all required tools, or manually:

cs install metals scalafmt scalafix

Key Files

File Purpose
.lsp.json Metals LSP configuration
hooks/hooks.json Automated development hooks
hooks/scripts/scala-hooks.sh Hook dispatcher script
commands/setup.md /setup command definition
.claude-plugin/plugin.json Plugin metadata

Conventions

  • Prefer minimal diffs
  • Keep hooks fast
  • Use immutable data structures
  • Prefer pattern matching over conditionals
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.

  1. 6d ago First seen · 33 lines · 192 tokens per session scan A 723d04b0b4e5

Subscribe to this mod's changes

scala-lsp CLAUDE.md is an instructions file published in the GitHub repository zircote/scala-lsp (3 stars, last pushed 27d ago), licensed MIT. It adds 192 tokens to every session, about $0.0010 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 2026-08-31.

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