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SessionStart

SessionStart is a hook for Claude Code from EpicGames/unreal-engine-skills-for-claude-code-plugin. Its token cost is not measured, scanned A, original, MIT.

A session-start hook is a script that runs when an agent session starts, resumes, or is cleared. This configuration runs an Unreal Engine context script with Bash.

In plain words
What is it for?
Preparing Unreal Engine context during startup, session resume, or session reset.
Why use it?
It can load project context at the beginning of an Unreal Engine session. The description does not specify exactly what context the script provides.

Hook for Claude Code ✓ vendor

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 unreal-engine-skills-for-claude-code plugin — 3 skills, 1 hook shipped together

not rated 1.9krepo +169 10d ago A scan tokens not measured original MIT

Good fit Preparing Unreal Engine context during startup, session resume, or session reset.

Compare 6 hooks from other repositories ↓
View source ↗ EpicGames/unreal-engine-skills-for-claude-code-plugin
About the project

Unreal Engine Skills for Claude Code is a plugin that lets Claude Code control the Unreal Editor through the Model Context Protocol, a standard way for AI clients to use external tools. It is for developers working on Unreal Engine projects who want an agent to operate editor features such as actors, blueprints, materials, testing, and animation systems. The catalogue entries are the plugin's skills and startup hook for providing Unreal-specific workflows and context.

EpicGames/unreal-engine-skills-for-claude-code-plugin · 1,904 stars · on GitHub

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 EpicGames/unreal-engine-skills-for-claude-code-plugin
Claude Code
/plugin install unreal-engine-skills-for-claude-code

Made for: Claude Code.

Or install unreal-engine-skills-for-claude-code, the plugin that ships this one along with the rest of its 3 skills, 1 hook.

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/epicgames/unreal-engine-skills-for-claude-code-plugin/session-start/github.svg)](https://agentmods.dev/hooks/epicgames/unreal-engine-skills-for-claude-code-plugin/session-start)
Your own site
<a href="https://agentmods.dev/hooks/epicgames/unreal-engine-skills-for-claude-code-plugin/session-start"><img src="https://agentmods.dev/badge/hooks/epicgames/unreal-engine-skills-for-claude-code-plugin/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/epicgames/unreal-engine-skills-for-claude-code-plugin/session-start"><img src="https://agentmods.dev/badge/hooks/epicgames/unreal-engine-skills-for-claude-code-plugin/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 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.

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 · 14 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "startup|resume|clear",
      "hooks": [
        {
          "type": "command",
          "command": "bash ${CLAUDE_PLUGIN_ROOT}/hooks/unreal-context.sh",
          "timeout": 5
        }
      ]
    }
  ]
}
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. 2mo ago First seen · 14 lines scan A 99c9e8c5fced

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository EpicGames/unreal-engine-skills-for-claude-code-plugin (1,904 stars, last pushed 10d 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.

Related

SessionStart compared with hooks from other repositories

SessionStart next to 6 hooks from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
SessionStartEpicGames/unreal-engine-skills-for-claude-code-pluginHook1.9k10d agoMITA—Claude Code
SessionStartsupabase/supabaseHook115ktodayApache-2.0A—Claude Code
PostToolUsesupabase/supabaseHook115ktodayApache-2.0A—Claude Code
SessionStartgoogle-gemini/gemini-cliHook109ktodayApache-2.0A—Claude Code
PreToolUseapache/supersetHook75ktodayApache-2.0A—Claude Code
PreToolUseanthropics/claude-cookbooksHook54k2d agoMITA—Claude Code
PostToolUseanthropics/claude-plugins-officialHook46ktodayApache-2.0A—Claude Code