agentmods.dev

SessionStart

SessionStart is a hook for coding agents from sehoon787/my-claude. Its token cost is not measured, scanned A, original, MIT.

A session-start hook configuration that runs two shell commands when a Claude Code session begins. One checks the hooks, and the other runs a session-start script.

In plain words
What is it for?
Use it to validate hook configuration and run project-specific startup setup when a session starts.
Why use it?
It automates checks and startup actions so they happen at the beginning of every session.

Hook

Part of the my-claude plugin — 4 skills, 8 hooks, 3 MCP servers shipped together

One of 8 entries in hooks.json — they are configured in one file and arrive together.

not rated 16 5d ago A scan tokens not measured original MIT
View the source file sehoon787/my-claude
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 hooks/sehoon787/my-claude/session-start
Clone the repo
git clone --depth 1 https://github.com/sehoon787/my-claude

Or install my-claude, the plugin that ships this one along with the rest of its 4 skills, 8 hooks, 3 MCP servers.

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 SessionStart

README.md
[![agentmods](https://agentmods.dev/badge/hooks/sehoon787/my-claude/session-start.svg)](https://agentmods.dev/hooks/sehoon787/my-claude/session-start)
Your own site
<a href="https://agentmods.dev/hooks/sehoon787/my-claude/session-start"><img src="https://agentmods.dev/badge/hooks/sehoon787/my-claude/session-start.svg" alt="Measured on agentmods" 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 A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

SessionStart 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 3d 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.

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.

hooks/hooks.json · 18 lines

What it actually says

{
  "SessionStart": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "node \"$HOME/.claude/scripts/validate-hooks.js\"",
          "timeout": 5000
        },
        {
          "type": "command",
          "command": "bash \"$HOME/.claude/hooks/session-start.sh\"",
          "timeout": 30000
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 8. Installing the file brings all of them; each is measured and scanned on its own page.

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. 3d ago First seen · 18 lines scan A 781f0a89ee51

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository sehoon787/my-claude (16 stars, last pushed 5d ago), licensed MIT. Its token cost is not measured: a hook is shell that never enters the context. 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.

ai-agentsanthropicclaudeclaude-codeclaude-code-pluginmcp
Related

Other hooks, from other repositories

PostToolUse

Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.

supabase/supabase · not measured

SessionStart

Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.

google-gemini/gemini-cli · not measured

SessionStart

Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.

supabase/supabase · not measured

PreToolUse

Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From apache/superset.

apache/superset · not measured

PreToolUse

Runs before the agent uses a tool, executing pre-write.sh and pre-bash.sh (2 commands). From anthropics/claude-cookbooks.

anthropics/claude-cookbooks · not measured

SessionStart

Runs when a session starts, executing session-start.sh. From anthropics/claude-cookbooks.

anthropics/claude-cookbooks · not measured