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SessionStart

SessionStart is a hook for Claude Code from activeing123/mcptoon. Its token cost is not measured, scanned A, a copy of SessionStart, Apache-2.0.

A session-start hook that runs a Python setup script when Claude Code begins. A hook is an automatic action triggered by an event such as starting a session.

In plain words
What is it for?
Use it to automatically check mcptoon availability at session start.
Why use it?
It checks whether the mcptoon command-line tool is available before the session needs it.

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 mcptoon plugin — 1 skill, 1 command, 1 hook, 1 MCP server shipped together

not rated 195repo yesterday A scan tokens not measured copy · 59% Apache-2.0

Good fit Use it to automatically check mcptoon availability at session start.

Compare 6 hooks from other repositories ↓
View source ↗ activeing123/mcptoon pypi.org
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 activeing123/mcptoon
Claude Code
/plugin install mcptoon

Made for: Claude Code.

Or install mcptoon, the plugin that ships this one along with the rest of its 1 skill, 1 command, 1 hook, 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/activeing123/mcptoon/session-start/github.svg)](https://agentmods.dev/hooks/activeing123/mcptoon/session-start)
Your own site
<a href="https://agentmods.dev/hooks/activeing123/mcptoon/session-start"><img src="https://agentmods.dev/badge/hooks/activeing123/mcptoon/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/activeing123/mcptoon/session-start"><img src="https://agentmods.dev/badge/hooks/activeing123/mcptoon/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 59% copy Near-identical to another mod 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 today.

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

This is a copy

59% identical to SessionStart — 8 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

claude-code-plugin/hooks/hooks.json · 15 lines

What it actually says

{
  "SessionStart": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "python \"${CLAUDE_PLUGIN_ROOT}/scripts/session_setup.py\"",
          "commandWindows": "python \"%CLAUDE_PLUGIN_ROOT%\\scripts\\session_setup.py\"",
          "statusMessage": "Checking mcptoon CLI availability",
          "timeout": 60
        }
      ]
    }
  ]
}
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. today First seen · 15 lines scan A b41d23f73c6f

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository activeing123/mcptoon (195 stars, last pushed yesterday), licensed Apache-2.0. 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. It is 59% identical to SessionStart, differing in 8 lines, and is treated as a copy.

Building agentsLLMaiclimcpmcp-servermodel-context-protocol
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 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

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

PostToolUse

Runs after a tool call finishes for Write and Edit tool calls, executing format-ts.mjs via node. From prisma/orm.

prisma/orm · not measured