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SessionStart

SessionStart is a hook for Claude Code from Yeachan-Heo/oh-my-claudecode. Its token cost is not measured, scanned A, original, MIT.

Session-start hooks that run Node.js scripts when a Claude Code session begins, or when it runs initialization or maintenance. The scripts handle session setup, project memory, wiki information, and related setup tasks.

In plain words
What is it for?
Use them to initialize a project, restore session or project memory, preserve wiki information, and perform maintenance setup.
Why use it?
They automate recurring preparation and maintenance tasks instead of requiring you to run each script manually at the start of a session.

Hook for Claude Code

Written for Claude Code: $CLAUDE_PLUGIN_ROOT variable.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the oh-my-claudecode plugin — 37 skills, 21 commands, 19 agents, 11 hooks, 1 MCP server shipped together

One of 11 entries in hooks.json upstream. Installing this one merges just its entry into your config; the other 10 are separate, each on its own page.

not rated 39krepo +96 today A scan tokens not measured original MIT

Good fit Use them to initialize a project, restore session or project memory, preserve wiki information, and perform maintenance setup.

Compare 6 hooks from other repositories ↓
View source ↗ Yeachan-Heo/oh-my-claudecode oh-my-claudecode.dev
About the project

Oh My Claude Code is a multi-agent orchestration system for Claude Code, coordinating specialized agents, commands, skills, hooks, and workflows. It is designed for developers who want Claude Code to handle coding tasks through coordinated agent roles. Catalogue entries are components of its Claude Code workflow, including agents, commands, skills, hooks, instructions, MCP configuration, and a plugin.

Yeachan-Heo/oh-my-claudecode · 39,036 stars · on GitHub · oh-my-claudecode.dev

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add Yeachan-Heo/oh-my-claudecode
Claude Code
/plugin install oh-my-claudecode

Made for: Claude Code.

Or install oh-my-claudecode, the plugin that ships this one along with the rest of its 37 skills, 21 commands, 19 agents, 11 hooks, 1 MCP server.

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/yeachan-heo/oh-my-claudecode/session-start.svg)](https://agentmods.dev/hooks/yeachan-heo/oh-my-claudecode/session-start)
Your own site
<a href="https://agentmods.dev/hooks/yeachan-heo/oh-my-claudecode/session-start"><img src="https://agentmods.dev/badge/hooks/yeachan-heo/oh-my-claudecode/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. 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 8d 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.

Origin

Copies of this mod

8 near-identical copies found in the catalogue:

hooks/hooks.json · 44 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "*",
      "hooks": [
        {
          "type": "command",
          "command": "node \"$CLAUDE_PLUGIN_ROOT\"/scripts/run.cjs \"$CLAUDE_PLUGIN_ROOT\"/scripts/session-start.mjs",
          "timeout": 5
        },
        {
          "type": "command",
          "command": "node \"$CLAUDE_PLUGIN_ROOT\"/scripts/run.cjs \"$CLAUDE_PLUGIN_ROOT\"/scripts/project-memory-session.mjs",
          "timeout": 5
        },
        {
          "type": "command",
          "command": "node \"$CLAUDE_PLUGIN_ROOT\"/scripts/run.cjs \"$CLAUDE_PLUGIN_ROOT\"/scripts/wiki-session-start.mjs",
          "timeout": 5
        }
      ]
    },
    {
      "matcher": "init",
      "hooks": [
        {
          "type": "command",
          "command": "node \"$CLAUDE_PLUGIN_ROOT\"/scripts/run.cjs \"$CLAUDE_PLUGIN_ROOT\"/scripts/setup-init.mjs",
          "timeout": 30
        }
      ]
    },
    {
      "matcher": "maintenance",
      "hooks": [
        {
          "type": "command",
          "command": "node \"$CLAUDE_PLUGIN_ROOT\"/scripts/run.cjs \"$CLAUDE_PLUGIN_ROOT\"/scripts/setup-maintenance.mjs",
          "timeout": 60
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 11. 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. 8d ago First seen · 44 lines scan A e13bb5bf0684

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository Yeachan-Heo/oh-my-claudecode (39,036 stars, last pushed today), 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 Codeagentic-codingai-agentsclaudeoh-my-opencodeopencode
Related

Other hooks, from other repositories

SessionStart

Runs when a session starts on startup and resume, executing deja.sh. From vshulcz/deja-vu.

vshulcz/deja-vu · not measured

PreCompact

Runs before the context is compacted, running swarm claude pre-compact. From joelhooks/swarm-tools.

joelhooks/swarm-tools · 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 on startup, executing install_pkgs.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