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Agent skill

Agent Safety Preflight

by jeremylongshore in jeremylongshore/tons-of-skills-marketplace

Generate a local repository risk receipt before Claude Code or other AI-agent edits.

MITAuto-check passedDevelopment

Install Agent Safety Preflight

skills CLI
$ npx skills add jeremylongshore/tons-of-skills-marketplace --skill agent-safety-preflight -a claude-code

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

GitHub CLI
$ gh skill install jeremylongshore/tons-of-skills-marketplace agent-safety-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/jeremylongshore/tons-of-skills-marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/.curated/agent-safety-preflight .claude/skills/agent-safety-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
agent-safety-preflight
GitHub stars
2.8k
Token cost
~1.2k tokens
SKILL.md length
529 words
Files
2 (incl. references)
Skills in repo
3,342
Repo updated
First seen
Licence
MIT

At a glance

Generate a local repository risk receipt before Claude Code or other AI-agent edits.

  • Works in 8 steps: Confirm the target repository path. Use… → Use Read only for local documentation or… → Run /agent-preflight when the command is… → …
  • The user asks to prepare a repository for agent changes
  • SKILL.md covers Overview, Prerequisites, Instructions and Output, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Agent Safety Preflight is an agent skill from jeremylongshore/tons-of-skills-marketplace. Generate a local repository risk receipt before Claude Code or other AI-agent edits. Use when the user asks to prepare a repository for agent changes, check for risky hooks or credential-writing automation, or run the /agent-preflight command. Trigger with "run agent preflight", "check this repo before agent edits", or "/agent-preflight".

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/decision-rules.md`). Compatibility notes: Designed for Claude Code

It sits in Development. It works with Git. The repository describes itself as: Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com. The licence is MIT.

When your agent uses it

  • The user asks to prepare a repository for agent changes
  • Check for risky hooks
  • Credential-writing automation
  • Run the /agent-preflight command

Example prompts

  • “run agent preflight”
  • “check this repo before agent edits”
  • “/agent-preflight”
  • “/agent-safety-preflight”

Requirements

  • Python 3
  • Compatibility (from SKILL.md): Designed for Claude Code
  • Pre-approved tools (allowed-tools): Read, Bash(git:*), Bash(python3:*)

Workflow steps

8 steps, taken from the first numbered list in SKILL.md.

  1. Confirm the target repository path. Use the current workspace unless the user supplied a path.
  2. Use Read only for local documentation or configuration files that explain the workspace; do not copy private source into the response.
  3. Run /agent-preflight when the command is installed, or invoke the bundled scanner from a trusted Claude install root.
  4. If the scanner is unavailable, apply the same manual decision rules: destructive commands, credential-writing automation, risky agent…
  5. Classify the workspace as Green, Yellow, or Red.
  6. Report the decision, evidence, and next safe action before making edits.
  7. For Yellow results, ask for a checkpoint or narrower scope before broad edits.
  8. For Red results, stop and request human review before changing files.

What it can do on your machine

Read from SKILL.md and the folder at commit cfae287. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Bash(git:*)
    • Bash(python3:*)

    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 markdown).

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

  • Network

    Links to these hosts (documentation or services it may open):

    • github.com
    • code.claude.com

    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.

  • Compatibility

    Designed for Claude Code

    From compatibility in the SKILL.md frontmatter.

Context cost

Agent Safety Preflight loads about 1.2k tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 91 tokens; SKILL.md has 529 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~91
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.5k

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

The full file from jeremylongshore/tons-of-skills-marketplace at commit cfae287, republished under its MIT licence (© jeremylongshore). 529 words, ~1,206 tokens.

Download SKILL.mdSave it as .claude/skills/agent-safety-preflight/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
agent-safety-preflight
description
Generate a local repository risk receipt before Claude Code or other AI-agent edits. Use when the user asks to prepare a repository for agent changes, check for risky hooks or credential-writing automation, or run the /agent-preflight command. Trigger with "run agent preflight", "check this repo before agent edits", or "/agent-preflight".
allowed-tools
Read, Bash(git:*), Bash(python3:*)
compatibility
Designed for Claude Code
argument-hint
[repo-path]
version
1.2.0
author
Signal Loom Works <194151508+el-zachariah@users.noreply.github.com>
license
MIT
tags
security, agent-safety, claude-code, preflight

Agent Safety Preflight

Overview

Agent Safety Preflight helps Claude inspect a local repository before making AI-agent-assisted edits. It produces a compact Green, Yellow, or Red risk receipt from local files only, with special attention to destructive shell patterns, credential-writing automation, agent authority surfaces, uncommitted changes, and unavailable git state.

The skill pairs with the /agent-preflight command in this plugin. Prefer the bundled lightweight scanner when it is available from a trusted Claude install root, then explain the decision and next safe action before editing.

Prerequisites

  • A local repository or workspace path to inspect.
  • Python 3 available for the bundled agent_preflight_lite.py scanner.
  • Git available when the workspace is a git repository.
  • Permission to read the target workspace locally.

Do not send source, secrets, tokens, private repository contents, payment credentials, or environment variables to external services while using this skill.

Instructions

  1. Confirm the target repository path. Use the current workspace unless the user supplied a path.
  2. Use Read only for local documentation or configuration files that explain the workspace; do not copy private source into the response.
  3. Run /agent-preflight when the command is installed, or invoke the bundled scanner from a trusted Claude install root.
  4. If the scanner is unavailable, apply the same manual decision rules: destructive commands, credential-writing automation, risky agent authority, git state, and high-risk shell or network install chains.
  5. Classify the workspace as Green, Yellow, or Red.
  6. Report the decision, evidence, and next safe action before making edits.
  7. For Yellow results, ask for a checkpoint or narrower scope before broad edits.
  8. For Red results, stop and request human review before changing files.

Output

Return a short receipt in Markdown that is safe to paste into the local work log or pull request notes:

markdown
## Agent Safety Preflight Receipt

- Decision: Green | Yellow | Red
- Repository: <path>
- Git state: clean | dirty | unavailable
- Risk buckets: <bullets>
- Evidence: <file/path markers>
- Next safe action: proceed | checkpoint | stop
Show full SKILL.md (237 more words)Show less

Error Handling

  • If the scanner cannot be found from a trusted install root, say that the automated scanner did not run and use the manual rules.
  • If git status is unavailable, classify the workspace as Yellow rather than Green.
  • If a file cannot be decoded, scan the readable prefix with tolerant UTF-8 decoding and include a note if relevant evidence may be incomplete.
  • If a destructive or credential-writing marker appears in an agent-controlled path, classify the workspace as Red and stop.
  • If the workspace is too large for a full pass, inspect high-signal paths first: .claude/, .cursor/, .github/, shell scripts, JSON/YAML/TOML config, package manifests, and environment files.

Examples

Example 1: Clean repo before routine edits

User request: "Run a preflight before you update this README."

The skill runs the scanner, sees a clean git state and no high-risk automation markers, then returns Green with the repository path and evidence summary.

Example 2: Agent hooks present

User request: "Check this repo before the agent refactor."

The skill detects agent hook configuration or broad tool permissions, returns Yellow, and recommends a checkpoint or narrower edit scope before continuing.

Example 3: Destructive automation found

User request: "Start editing this generated-project repo."

The skill finds a destructive recursive delete pattern in an automation file, returns Red, and stops until a human reviews the workflow.

Resources

© jeremylongshore, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in skills/.curated/agent-safety-preflight of jeremylongshore/tons-of-skills-marketplace.

  • SKILL.md
  • references/decision-rules.md

Open the folder on GitHubat commit cfae287

Compare with similar skills

Agent Safety 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.

Agent Safety Preflight compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Agent Safety Preflight this skilljeremylongshore/tons-of-skills-marketplace2.8k—~1.2kAutomated safety check: PassMIT
Finishing a Development Branchobra/superpowers297k5 repos~1.9kAutomated safety check: PassMIT
Code Review ChecklistshareAI-lab/learn-claude-code78k4 repos~1.1kAutomated safety check: PassMIT
Contributor-First PR MergeHKUDS/OpenHarness16k1 repos~847Automated safety check: PassMIT
Finishing A Development Branchfarm-fe/farm5.6k35 repos~1.8kAutomated safety check: PassMIT
Migrate Internal Package into GhostTryGhost/Ghost56k—~3.8kAutomated safety check: PassMIT

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Works with

Categories

Questions about Agent Safety Preflight

What does Agent Safety Preflight do?

Generate a local repository risk receipt before Claude Code or other AI-agent edits. Agent Safety Preflight is an agent skill from jeremylongshore/tons-of-skills-marketplace. Generate a local repository risk receipt before Claude Code or other AI-agent edits.

When should I use Agent Safety Preflight?

Agent Safety Preflight fits situations like: the user asks to prepare a repository for agent changes; check for risky hooks; credential-writing automation; run the /agent-preflight command.

How do I install Agent Safety Preflight in Claude Code?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill agent-safety-preflight -a claude-code`. Or copy the skill folder (skills/.curated/agent-safety-preflight in jeremylongshore/tons-of-skills-marketplace) into .claude/skills/agent-safety-preflight in your project. Claude Code loads it when a task matches its description.

How do I install Agent Safety Preflight in Codex?

Run `npx skills add jeremylongshore/tons-of-skills-marketplace --skill agent-safety-preflight -a codex`. Or copy the skill folder (skills/.curated/agent-safety-preflight in jeremylongshore/tons-of-skills-marketplace) into .agents/skills/agent-safety-preflight in your project. Codex loads it when a task matches its description.

Can I use Agent Safety 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 jeremylongshore/tons-of-skills-marketplace --skill agent-safety-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/agent-safety-preflight, .gemini/skills/agent-safety-preflight, .github/skills/agent-safety-preflight and .opencode/skills/agent-safety-preflight in your project.

What does Agent Safety Preflight need to run?

SKILL.md names no scripts, command-line tools or credentials: Agent Safety Preflight is instructions for the agent only. Our summary lists: Python 3. Its frontmatter pre-approves these tools: Read, Bash(git:*), Bash(python3:*). Compatibility (from SKILL.md): Designed for Claude Code.

Does Agent Safety Preflight access the network?

SKILL.md names 2 domains. As links in the text: github.com and code.claude.com. This is read from the text; nothing was executed.

Is Agent Safety 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 Agent Safety Preflight use?

Agent Safety Preflight is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Agent Safety Preflight use?

About 1.2k tokens (SKILL.md is roughly 4.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 293 tokens, read only when the agent opens those files.

What are the alternatives to Agent Safety Preflight?

Skills that share tags, products or a category with Agent Safety Preflight: Finishing a Development Branch (obra/superpowers, 297k stars), Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars), Contributor-First PR Merge (HKUDS/OpenHarness, 16k stars) and Finishing A Development Branch (farm-fe/farm, 5.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Agent Safety Preflight?

jeremylongshore (a GitHub user) maintains it in jeremylongshore/tons-of-skills-marketplace, which has 2,827 GitHub stars. The repository holds 3,342 skills in this directory. The repository was last updated on October 10, 2026.

Source: jeremylongshore/tons-of-skills-marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.