What is zvm CLAUDE.md?

Repository instructions for ZVM, a Go command-line tool that installs and manages Zig compiler versions and the Zig Language Server. They document the project, build and test commands, architecture, and packaging details.

Use them when changing ZVM, running Go tests or checks, creating release artifacts, or building versions with different upgrade behavior.

They give coding agents the project-specific information needed to build, test, format, inspect, and package the repository correctly.

How tristanisham/zvm configures Claude Code

About the project

zvm is a version manager for the Zig programming language that installs and switches between Zig releases. Developers use it when projects require different Zig versions or when Zig changes frequently.

tristanisham/zvm · 1,056 stars · on GitHub · zvm.app

Reuse

Borrowing it

Nothing to install: this file belongs to tristanisham/zvm. 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/tristanisham/zvm/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/tristanisham/zvm

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/tristanisham/zvm/claude-md.svg)](https://agentmods.dev/instructions/tristanisham/zvm/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/tristanisham/zvm/claude-md"><img src="https://agentmods.dev/badge/instructions/tristanisham/zvm/claude-md.svg" alt="Measured on agentmods" height="20"></a>

Per session 1,202 This file is loaded in full into every session.

When invoked 1,202 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.

Model	Per session	Once invoked
Fable 5.1	$0.01202	$0.01202
Opus 5	$0.00601	$0.00601
Sonnet 5	$0.00240	$0.00240
Haiku 4.5	$0.00120	$0.00120

Measured 8d ago against content hash 0a807836f8b8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

zvm 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 8d 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 · 75 lines

How it starts

The opening of the file, as written. The whole thing — 75 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

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

Project Overview

ZVM (Zig Version Manager) is a CLI tool written in Go for installing and managing multiple Zig compiler versions. It also supports installing ZLS (Zig Language Server). Built with urfave/cli/v3.

Build & Test Commands

go build -v .                    # Build the binary
go test -v ./...                 # Run all tests
go test -v ./cli/ -run TestName  # Run a single test
go vet ./...                     # Static analysis
go fmt ./...                     # Format code

Build without self-upgrade capability (for package manager distributions):

go build -tags noAutoUpgrades .

Package managers should also override the upgrade hint shown by zvm upgrade. The default in main.go is generic; inject a specific one (note the quotes — the value contains spaces and Go re-splits the -ldflags string):

go build -tags noAutoUpgrades \
  -ldflags "-s -w -X 'main.BuildUpgradeMessage=Use \`brew upgrade zvm\` to update ZVM.'" .

Deno tasks (see deno.jsonc):

deno task build          # cross-platform release artifacts into build/
deno task star-history   # regenerate the README star chart (needs GITHUB_TOKEN)

Architecture

Entry point: main.go — defines the CLI app with urfave/cli/v3. A Before hook initializes a global ZVM instance that all command handlers share.

Core type: cli.ZVM (in cli/config.go) holds baseDir (default ~/.zvm) and Settings. Initialized via Initialize() which creates the directory structure and loads ~/.zvm/settings.json.

Key flows:

Install (cli/install.go): fetches version map → downloads tarball → verifies minisign signature + SHA256 → extracts to ~/.zvm/<version>/. Most complex file (~600 lines). Handles mirrors, ZLS co-installation, and platform-specific extraction.
Use (cli/use.go): switches active version by symlinking ~/.zvm/bin → ~/.zvm/<version> via meta.Link().
Upgrade (cli/upgrade.go): self-upgrade from GitHub releases. Guarded by !noAutoUpgrades build tag.
Sync (cli/sync.go): reads build.zig for //! zvm-lock: <version> and switches to that version. (Note: build.zig, not build.zig.zon — .minimum_zig_version in build.zig.zon is a separate fallback used by cli/use.go:ExtractMinimumZigVersion.)

Read the full file on GitHub · 75 lines

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.

8d ago First seen · 75 lines · 1,202 tokens per session scan A 0a807836f8b8

Subscribe to this mod's changes

zvm CLAUDE.md is an instructions file published in the GitHub repository tristanisham/zvm (1,056 stars, last pushed yesterday), licensed MIT. It adds 1,202 tokens to every session, about $0.0060 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.

version-control version-manager versioning zig ziglang

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zvm: Instructions file for Claude Code