What is lantern CLAUDE.md?

A project guide for Claude that sets coding, testing, API, commit, and release-note rules for the Lantern codebase.

Use it when asking an agent to work on Lantern, especially for implementation, tests, type checking, cleanup, or commits.

It gives an agent the project’s important constraints before it changes code, helping avoid forbidden tools, inconsistent commits, and missed checks.

How WildChildForLife/lantern configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to WildChildForLife/lantern. 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/WildChildForLife/lantern/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/WildChildForLife/lantern

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/wildchildforlife/lantern/claude-md/github.svg)](https://agentmods.dev/instructions/wildchildforlife/lantern/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/wildchildforlife/lantern/claude-md"><img src="https://agentmods.dev/badge/instructions/wildchildforlife/lantern/claude-md/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/instructions/wildchildforlife/lantern/claude-md"><img src="https://agentmods.dev/badge/instructions/wildchildforlife/lantern/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,636 This file is loaded in full into every session.

When invoked 1,636 The same file — it is already loaded in full.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin 86% copy Near-identical to another mod 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	$0.01636	$0.01636
Opus 5.5	$0.00654	$0.00654
Sonnet 5.5	$0.00327	$0.00327
Haiku 4.5	$0.00164	$0.00164

Measured 1mo ago against content hash 10df52943d98, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

lantern CLAUDE.md scanned grade A with 1 finding 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.

Runs shell commandslowCapability

Expected in a hook, worth knowing in a rule or an instructions file.

- `Command.string` instead of `child_process`

Origin

This is a copy

86% identical to lantern AGENTS.md — 71 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 202 lines

How it starts

The opening of the file, as written. The whole thing — 202 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Critical Rules (Read First)

Language:

Code, comments, commits in English

NEVER:

Use as type casting anywhere, tests included (explain problem to user instead)
Use raw fetch or bypass TanStack Query for API calls
Run pnpm dev or pnpm start (dev servers)
Use node:fs, node:path, etc. directly (use Effect-TS equivalents)

ALWAYS:

Effect-TS for all backend side effects
Hono RPC + TanStack Query for all API calls
TDD: tests first, then implement
Run pnpm typecheck and pnpm fix before commit

Commit Message Rules

Conventional Commits: type: description

Release Note Awareness:

Commit messages ship in release notes. Write for users.

Type Selection:

Type	Release Note	Purpose
`feat`	Features	User-facing new feature
`fix`	Bug Fixes	User-impacting bug fix
`chore`, `ci`, `build`, `refactor`	Excluded	Internal changes

Critical: fix only for user-facing bugs. Internal fixes (linter errors, type errors, build scripts) use chore.

Message Quality Examples:

Bad: fix: fix lingui error (internal issue)
Bad: feat: add button (too vague)
Good: feat: add dark mode toggle to settings
Good: fix: session list not updating after deletion
Good: chore: update lingui compiled messages

Project Overview

Lantern reads Claude Code session logs straight from JSONL files (~/.claude/projects/), zero data loss. Web client built as CLI tool serving Vite app.

Core Architecture:

Frontend: Vite + TanStack Router + React 19 + TanStack Query
Backend: Hono (standalone server) + Effect-TS (all business logic)
Data: Direct JSONL reads, strict Zod validation
Real-time: Server-Sent Events (SSE) for live updates

Recommended Coding Process

Project aims for fast feedback AND code quality (checks pass = runtime correctness near-guaranteed) via:

Read the full file on GitHub · 202 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 · 202 lines · 1,636 tokens per session scan A 10df52943d98

Subscribe to this mod's changes

lantern CLAUDE.md is an instructions file published in the GitHub repository WildChildForLife/lantern (21 stars, last pushed 6d ago), licensed MIT. It adds 1,636 tokens to every session, about $0.0065 per session on Opus 5.5. A static security scan graded it A with 1 finding (runs shell commands). It is 86% identical to lantern AGENTS.md, differing in 71 lines, and is treated as a copy.

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Instructions for PIsberg/vibetags, covering copilot instructions for asynctestconfig and immutable type.

PIsberg/vibetags · 82 tokens

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 9,715 tokens

lantern: Instructions file for Claude Code