Use it to list skills in the user or project Claude skills directories at the beginning of each session.

It automatically shows which skills are installed, so you do not have to check those folders yourself.

How ahgraber/skills configures Claude Code

skills: Hook for Claude Code

.claude/settings.json

SessionStart is a hook for Claude Code from ahgraber/skills. Its token cost is not measured, scanned B, original, CC0-1.0.

A session-start hook that runs a shell command when a coding-agent session begins. A shell command is a line of text executed by the operating system.

In plain words

What is it for?: Use it to list skills in the user or project Claude skills directories at the beginning of each session.
Why use it?: It automatically shows which skills are installed, so you do not have to check those folders yourself.

Written for Claude Code: SessionStart hook event. Also seen: reads .claude/ paths.

This is ahgraber/skills's own configuration. It tells Claude Code how to work on skills 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 skills configures →

One of 2 entries in settings.json upstream. Installing this one merges just its entry into your config; the other 1 are separate, each on its own page.

Reuse

Borrowing it

Nothing to install: this file belongs to ahgraber/skills. 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/ahgraber/skills/main/.claude/settings.json

Clone the repo

git clone --depth 1 https://github.com/ahgraber/skills

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/hooks/ahgraber/skills/session-start/github.svg)](https://agentmods.dev/hooks/ahgraber/skills/session-start)

Your own site

<a href="https://agentmods.dev/hooks/ahgraber/skills/session-start"><img src="https://agentmods.dev/badge/hooks/ahgraber/skills/session-start/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/hooks/ahgraber/skills/session-start"><img src="https://agentmods.dev/badge/hooks/ahgraber/skills/session-start.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

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

Origin original No closer match found in the catalogue.

Security

Grade B, and why

SessionStart scanned grade B 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 2mo ago.

A static scan of the commands this hook runs, not an audit. A hook is shell that executes on your machine at the event it names, which is why every command in it is printed with what was found.

Enumerates other installed skillsmediumAgent snooping

Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.

"command": "echo 'Installed skills:'; ls ~/.claude/skills/ 2>/dev/null; ls .claude/skills/ 2>/dev/null"

.claude/settings.json · 12 lines

What it actually says

{
  "SessionStart": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "echo 'Installed skills:'; ls ~/.claude/skills/ 2>/dev/null; ls .claude/skills/ 2>/dev/null"
        }
      ]
    }
  ]
}

Same file

What else `settings.json` configures

This page is one entry in a file that holds 2. Installing the file brings all of them; each is measured and scanned on its own page.

Settings file skills B not measured

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.

2mo ago First seen · 12 lines scan B 1b21f4964705

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository ahgraber/skills (6 stars, last pushed 8d ago), licensed CC0-1.0. Its token cost is not measured: a hook is shell that never enters the context. A static security scan graded it B with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

agent-skills

SessionStart next to 6 hooks from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
SessionStartahgraber/skills	Hook	6	8d ago	CC0-1.0	B	—	Claude Code
PostToolUsesupabase/supabase	Hook	115k	today	Apache-2.0	A	—	Claude Code
SessionStartsupabase/supabase	Hook	115k	today	Apache-2.0	A	—	Claude Code
SessionStartgoogle-gemini/gemini-cli	Hook	109k	today	Apache-2.0	A	—	Claude Code
PreToolUseapache/superset	Hook	75k	yesterday	Apache-2.0	A	—	Claude Code
PreToolUseanthropics/claude-cookbooks	Hook	54k	2d ago	MIT	A	—	Claude Code
PostToolUseanthropics/claude-plugins-official	Hook	46k	today	Apache-2.0	A	—	Claude Code