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preflight: Instructions file for Claude Code

CLAUDE.md

preflight CLAUDE.md is an instructions file for Claude Code from Nancy-Chauhan/preflight. It costs 225 tokens per session, scanned A, original, MIT.

Project instructions for Preflight, a Claude Code plugin that reads a codebase and produces a read-only analysis report.

In plain words
What is it for?
Use them when maintaining the plugin, its service and pricing references, example reports, or the codebase-analysis workflow.
Why use it?
They keep the analysis grounded in the actual repository and prevent the plugin from changing code or using unsupported generic figures.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions .claude-plugin; mentions Claude Code.

This is Nancy-Chauhan/preflight's own configuration. It tells Claude Code how to work on preflight 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 preflight configures →

not rated 13repo 8mo ago A scan 225 tokens original MIT
View source ↗ Nancy-Chauhan/preflight
Reuse

Borrowing it

Nothing to install: this file belongs to Nancy-Chauhan/preflight. 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/Nancy-Chauhan/preflight/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/Nancy-Chauhan/preflight

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.

agentmods badge for preflight CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/nancy-chauhan/preflight/claude-md/github.svg)](https://agentmods.dev/instructions/nancy-chauhan/preflight/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/nancy-chauhan/preflight/claude-md"><img src="https://agentmods.dev/badge/instructions/nancy-chauhan/preflight/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.

agentmods 80×15 button for preflight CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/nancy-chauhan/preflight/claude-md"><img src="https://agentmods.dev/badge/instructions/nancy-chauhan/preflight/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 225 This file is loaded in full into every session.
When invoked 225 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 $0.00225 $0.00225
Opus 5.5 $0.00090 $0.00090
Sonnet 5.5 $0.00045 $0.00045
Haiku 4.5 $0.00022 $0.00022

Measured 2mo ago against content hash 03bde66ac22c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

preflight 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 2mo 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 · 25 lines

What it actually says

Preflight - Claude Code Plugin

This is a Claude Code plugin that provides the /preflight skill for analyzing codebases.

Project Structure

  • .claude-plugin/plugin.json - Plugin manifest
  • skills/preflight/SKILL.md - Core skill instructions (the main product)
  • skills/preflight/services.md - Service detection database with pricing data
  • skills/preflight/examples.md - Example output reports

Key Principles

  • The SKILL.md IS the product. It instructs Claude how to analyze any codebase.
  • services.md is a reference database. The skill also uses WebSearch for current pricing.
  • Every number in the output must come from the actual code, not generic benchmarks.
  • The skill is read-only -- it never modifies the user's codebase.

When Editing

  • Keep SKILL.md under 500 lines
  • When adding services to services.md, include: packages, env vars, ALL tier pricing, rate limits, gotchas
  • Update examples.md when changing output format
  • Update README.md supported services table when adding new services
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. 2mo ago First seen · 25 lines · 225 tokens per session scan A 03bde66ac22c

Subscribe to this mod's changes

preflight CLAUDE.md is an instructions file published in the GitHub repository Nancy-Chauhan/preflight (13 stars, last pushed 8mo ago), licensed MIT. It adds 225 tokens to every session, about $0.0009 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 2026-08-30.

Related

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