A setup helper for Zig projects that adds version-specific guidance to CLAUDE.md, the file used to give Claude project instructions. Zig is a programming language, and the helper supports Zig 0.15.x and 0.16.x.

Use it at the start of a Zig project or when updating its instructions. It covers version-sensitive areas such as input/output, lists, formatting, build files, and standard-library changes.

It addresses outdated coding patterns that can cause Claude to suggest code for the wrong Zig version. It detects the project's target version and adds the matching corrections.

zig-init — Skill for Claude Code by kelp/agent-plugins

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add kelp/agent-plugins

Claude Code

/plugin install zig-claude-kit

Made for: Claude Code.

Or install zig-claude-kit, the plugin that ships this one along with the rest of its 3 skills.

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/kelp/agent-plugins/zig-init/github.svg)](https://agentmods.dev/skills/kelp/agent-plugins/zig-init)

Your own site

<a href="https://agentmods.dev/skills/kelp/agent-plugins/zig-init"><img src="https://agentmods.dev/badge/skills/kelp/agent-plugins/zig-init/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/kelp/agent-plugins/zig-init"><img src="https://agentmods.dev/badge/skills/kelp/agent-plugins/zig-init.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 91 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 657 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	$0.00091	$0.00657
Opus 5.5	$0.00036	$0.00263
Sonnet 5.5	$0.00018	$0.00131
Haiku 4.5	$0.00009	$0.00066

Measured 1mo ago against content hash 9bdf5a721a2f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

zig-init 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 1mo 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.

plugins/zig-claude-kit/skills/zig-init/SKILL.md · 77 lines

How it starts

The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/zig-init

Add Zig training corrections to this project's CLAUDE.md. The plugin supports both 0.15.x and 0.16.x; this skill detects the target version and appends the matching fragment.

Procedure

1. Detect Zig version

Run the detection helper:

${CLAUDE_PLUGIN_ROOT}/scripts/detect-zig-version.sh

It prints 0.15 or 0.16 based on (in order): the project's build.zig.zon .minimum_zig_version field, then zig version if zig is on PATH, then a default of 0.16.

Capture the output as $VERSION.

2. Read the version-specific fragment

Read the file at:

${CLAUDE_PLUGIN_ROOT}/docs/$VERSION/claude-md-fragment.md

This contains the corrections formatted as a CLAUDE.md section matched to the detected version. If the file is missing, report the error to the user and stop -- do not proceed.

3. Check current CLAUDE.md

Each fragment opens with a version-specific marker heading:

0.15 fragment: ## Zig 0.15.x Training Corrections
0.16 fragment: ## Zig 0.16.x Training Corrections

Branch on the detected version:

If no CLAUDE.md exists in the project root, create one with just a # CLAUDE.md header followed by the fragment content.
If CLAUDE.md already contains the version-specific marker, report "Zig $VERSION.x corrections already present" and stop.
If CLAUDE.md contains the other version's marker (e.g. the project was previously targeting 0.15 and is now 0.16), report "CLAUDE.md has corrections for the other Zig version ($OTHER); manual review needed before swapping" and stop — do not silently overwrite.
Otherwise append the fragment content to the end of the file. Ensure a blank line separates the existing content from the fragment.

4. Report result

Tell the user what you did:

"Created CLAUDE.md with Zig $VERSION.x corrections"
"Added Zig $VERSION.x corrections to existing CLAUDE.md"
"Zig $VERSION.x corrections already present in CLAUDE.md"
"CLAUDE.md targets the other Zig version; manual review needed before swapping" (with current marker named)

Read the full file on GitHub · 77 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.

1mo ago First seen · 77 lines · 91 tokens per session scan A 9bdf5a721a2f

Subscribe to this mod's changes

zig-init is a skill published in the GitHub repository kelp/agent-plugins (2 stars, last pushed 1mo ago), licensed MIT. It adds 91 tokens to every session and 657 once invoked, about $0.0004 per session on Opus 5.5. 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.

Claude Code Languages claude claude-code-plugins llm-training zig zig-lang

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