agentmods.dev

SessionStart

SessionStart is a hook for Claude Code from code-yeongyu/lazycodex. Its token cost is not measured, scanned A, original, MIT.

A startup hook that runs a Node.js command when a coding-agent session begins. In this configuration, it checks and prepares LazyCodex's bundled components.

In plain words
What is it for?
Use it to run setup or provisioning checks at session start on supported systems, including a separate Windows command.
Why use it?
It automates session initialization so required bootstrap checks happen before other work starts.

Hook for Claude Code

Written for Claude Code: SessionStart hook event.

not rated 3.8krepo +31 changed 2d ago A scan tokens not measured original MIT

Good fit Use it to run setup or provisioning checks at session start on supported systems, including a separate Windows command.

Compare 6 hooks from other repositories ↓
Install with agentmods
npx agentmods add hooks/code-yeongyu/lazycodex/session-start
View source ↗ code-yeongyu/lazycodex lazycodex.ai
About the project

LazyCodex is an agent harness for working on complex codebases, combining project memory, planning, execution, and completion checks inside Codex. It is for developers who want structured, repeatable assistance when handling substantial software projects. The catalogue contains the skills, hook, and MCP integration that provide its workflow inside Codex.

code-yeongyu/lazycodex · 3,782 stars · on GitHub · lazycodex.ai

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.

Clone the repo
git clone --depth 1 https://github.com/code-yeongyu/lazycodex

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.

agentmods badge for SessionStart

README.md
[![agentmods](https://agentmods.dev/badge/hooks/code-yeongyu/lazycodex/session-start/github.svg)](https://agentmods.dev/hooks/code-yeongyu/lazycodex/session-start)
Your own site
<a href="https://agentmods.dev/hooks/code-yeongyu/lazycodex/session-start"><img src="https://agentmods.dev/badge/hooks/code-yeongyu/lazycodex/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.

agentmods 80×15 button for SessionStart

Your own site · 80×15
<a href="https://agentmods.dev/hooks/code-yeongyu/lazycodex/session-start"><img src="https://agentmods.dev/badge/hooks/code-yeongyu/lazycodex/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 A 0 findings. 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 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 2d 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.

plugins/omo/components/bootstrap/hooks/hooks.json · 15 lines

What it actually says

{
  "SessionStart": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "node \"${PLUGIN_ROOT}/components/bootstrap/dist/cli.js\" hook session-start",
          "commandWindows": "powershell -NoProfile -ExecutionPolicy Bypass -File \"${PLUGIN_ROOT}\\components\\bootstrap\\scripts\\bootstrap.ps1\"",
          "timeout": 30,
          "statusMessage": "(OmO 5.1.33) Checking Bootstrap Provisioning"
        }
      ]
    }
  ]
}
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. 2d ago Changed d4c08635d2c5
  2. 3d ago Changed d3ab25a11f78
  3. 4d ago Changed b4f4b16a4b79
  4. 6d ago Changed 5db402294098
  5. 7d ago Changed 73f6459bd9d4
  6. 8d ago Changed d55988a483d8
  7. 9d ago Changed a48e3a60a348
  8. 10d ago Changed e489b368a29c
  9. 11d ago Changed 93978699b601
  10. 12d ago First seen · 15 lines scan A 72f961db0b9c

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository code-yeongyu/lazycodex (3,782 stars, last pushed 2d 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.

Claude Codeaiai-agentsclaudeclicodex
Related

Other hooks, from other repositories

SessionStart

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

supabase/supabase · not measured

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

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