preflight

preflight is a skill for Claude Code, Codex from jukanntenn/glm-plan-usage. It costs 104 tokens per session (473 once invoked), scanned A, original, MIT.

An acceptance-testing checklist generator that compares the current codebase with the latest released version. Acceptance testing checks whether changed software behaves as required from a user's or operator's point of view.

In plain words
What is it for?
Use it to document what changed, how to verify each functional area, which commands or settings to check, and what risks to watch before release.
Why use it?
It turns a large code and commit difference into a structured verification manual, so important behavior changes and edge cases are less likely to be missed.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/jukanntenn/glm-plan-usage/preflight
Any agent
npx skills add jukanntenn/glm-plan-usage --skill preflight
Clone the repo
git clone --depth 1 https://github.com/jukanntenn/glm-plan-usage

Made for: Claude Code, Codex.

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

README.md
[![agentmods](https://agentmods.dev/badge/skills/jukanntenn/glm-plan-usage/preflight.svg)](https://agentmods.dev/skills/jukanntenn/glm-plan-usage/preflight)
Your own site
<a href="https://agentmods.dev/skills/jukanntenn/glm-plan-usage/preflight"><img src="https://agentmods.dev/badge/skills/jukanntenn/glm-plan-usage/preflight.svg" alt="Measured on agentmods" height="20"></a>
Per session 104 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 473 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00104 $0.00473
Opus 5 $0.00052 $0.00236
Sonnet 5 $0.00021 $0.00095
Haiku 4.5 $0.00010 $0.00047

Measured 5d ago against content hash 45dc8c4811ef, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

preflight 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 5d 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/skills/preflight/SKILL.md · 45 lines

What it actually says

Generate an end-to-end acceptance manual by diffing the current working tree against the last released version.

Process

  1. Identify versions — find the latest tag (git describe --tags --abbrev=0) and confirm the target scope (default: diff from that tag to HEAD).
  2. Gather the full diffgit diff <tag>..HEAD plus git log --oneline <tag>..HEAD. Read changed source files to understand intent behind each change — not just what lines moved, but what behavior changed for the user.
  3. Classify every change — for each diff, determine: new features, modified behavior, fixed bugs, removed functionality, config changes, and breaking changes.
  4. Produce the acceptance manual — output a structured checklist organized by functional area (not by file or commit) to a file using output format bellow. For each item include:
    • What changed (one-line summary)
    • How to verify it (concrete steps: which command to run, what output to expect, which config field to check)
    • Edge cases or risks to watch for

Output format

# Preflight Acceptance Manual — <tag> → HEAD

## Summary

<one-paragraph overview of all changes>

## 1. <Functional Area>

- [ ] **<change summary>** — <verification steps>
- [ ] **<change summary>** — <verification steps>

## 2. <Functional Area>

...

Keep the manual concise, actionable, and free of implementation details. Every checklist item must be verifiable by running a command or observing a behavior — no vague items like "verify it works."

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. 5d ago First seen · 45 lines · 104 tokens per session scan A 45dc8c4811ef

Subscribe to this mod's changes

preflight is a skill published in the GitHub repository jukanntenn/glm-plan-usage (13 stars, last pushed 2mo ago), licensed MIT. It adds 104 tokens to every session and 473 once invoked, about $0.0005 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.

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