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Agent skill

Preflight

by openwpm in openwpm/OpenWPM

Use BEFORE implementing code in a crosslink-tracked project — loads .crosslink/rules/global.md, the language rules for detected manifests, the project rules, and the active tracking-<mode.md.

Custom licenceAuto-check passed

Install Preflight

skills CLI
$ npx skills add openwpm/OpenWPM --skill preflight -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install openwpm/OpenWPM preflight --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/openwpm/OpenWPM.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/preflight .claude/skills/preflight && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
preflight
GitHub stars
1.4k
Token cost
~670 tokens
SKILL.md length
201 words
Files
1
Skills in repo
13
Repo updated
First seen
Licence
Custom licence

At a glance

Use BEFORE implementing code in a crosslink-tracked project — loads .crosslink/rules/global.md, the language rules for detected manifests, the project rules, and the active tracking-<mode.md.

  • Works in 6 steps: Read core rules → Detect active languages and load rules → Read project-specific and tracking rules → …
  • The user says preflight
  • SKILL.md covers 1. Read core rules, 2. Detect active languages and…, 3. Read project-specific and… and 4. Scan project tree, plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Preflight is an agent skill from openwpm/OpenWPM. Use BEFORE implementing code in a crosslink-tracked project — loads .crosslink/rules/global.md, the language rules for detected manifests, the project rules, and the active tracking-<mode.md. Replaces the heavy context that would otherwise be re-injected on every prompt. Trigger when the user says "preflight", "load the rules", "ground yourself", or before starting a fresh implementation session.

Its SKILL.md is about 670 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It works with Elixir, Rust, Python and Ruby. The repository describes itself as: A web privacy measurement framework.

When your agent uses it

  • The user says preflight
  • Ground yourself
  • Before starting a fresh implementation session

Example prompts

  • “preflight”
  • “load the rules”
  • “ground yourself”
  • “/preflight”

Requirements

  • Python 3

Workflow steps

6 steps, taken from the step headings in SKILL.md.

  1. Read core rules
  2. Detect active languages and load rules
  3. Read project-specific and tracking rules
  4. Scan project tree
  5. Check dependency versions
  6. Print summary

What it can do on your machine

Read from SKILL.md and the folder at commit da628ba. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Preflight loads about 670 tokens when it runs. Until then it costs about 104 tokens; SKILL.md has 201 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~104
When it runs · the whole SKILL.md, loaded when a task matches
~670

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 201 words (~670 tokens).

“You are preparing to implement code. Load the project's rules and grounding context so you have the right constraints in mind. This replaces the heavy context that would otherwise be injected on every prompt.”

— opening of SKILL.md by openwpm, Custom licence
name
preflight

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/preflight of openwpm/OpenWPM.

Open the folder on GitHubat commit da628ba

Compare with similar skills

Preflight next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Preflight compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Preflight this skillopenwpm/OpenWPM1.4k—~670Automated safety check: PassCustom licence
Temporal Developertemporalio/skill-temporal-developer230—~2.5kAutomated safety check: PassMIT
Supercovsupercorp-ai/supercov1501 repos~415Automated safety check: PassMIT
MCP SDK Tier Auditmodelcontextprotocol/conformance129—~4.4kAutomated safety check: PassCustom licence
Supercov Securitysupercorp-ai/supercov1501 repos~236Automated safety check: PassMIT
Firecrawl Page Scrape Integrationfirecrawl/firecrawl190k1 repos~944Automated safety check: PassISC

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More from openwpm/OpenWPM

All 13 skills in this repo

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  • Commit

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  • Design

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  • Featree

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Works with

Questions about Preflight

What does Preflight do?

Use BEFORE implementing code in a crosslink-tracked project — loads .crosslink/rules/global.md, the language rules for detected manifests, the project rules, and the active tracking-<mode.md. Preflight is an agent skill from openwpm/OpenWPM.md.

When should I use Preflight?

Preflight fits situations like: the user says preflight; ground yourself; before starting a fresh implementation session.

How do I install Preflight in Claude Code?

Run `npx skills add openwpm/OpenWPM --skill preflight -a claude-code`. Or copy the skill folder (.claude/skills/preflight in openwpm/OpenWPM) into .claude/skills/preflight in your project. Claude Code loads it when a task matches its description.

How do I install Preflight in Codex?

Run `npx skills add openwpm/OpenWPM --skill preflight -a codex`. Or copy the skill folder (.claude/skills/preflight in openwpm/OpenWPM) into .agents/skills/preflight in your project. Codex loads it when a task matches its description.

Can I use Preflight in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add openwpm/OpenWPM --skill preflight -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/preflight, .gemini/skills/preflight, .github/skills/preflight and .opencode/skills/preflight in your project.

What does Preflight need to run?

SKILL.md names no scripts, command-line tools or credentials: Preflight is instructions for the agent only. Our summary lists: Python 3.

Does Preflight access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Preflight safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Preflight use?

Preflight has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Preflight use?

About 670 tokens (SKILL.md is roughly 2.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Preflight?

Skills that share tags, products or a category with Preflight: Temporal Developer (temporalio/skill-temporal-developer, 230 stars), Supercov (supercorp-ai/supercov, 150 stars), MCP SDK Tier Audit (modelcontextprotocol/conformance, 129 stars) and Supercov Security (supercorp-ai/supercov, 150 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Preflight?

openwpm (a GitHub organization) maintains it in openwpm/OpenWPM, which has 1,423 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on October 4, 2026.

Source: openwpm/OpenWPM on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.