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SessionStart

SessionStart is a hook for Claude Code, Cursor from LerianStudio/ring. Its token cost is not measured, scanned A, original, Apache-2.0.

A session-start hook that runs session-start.sh when an agent session starts, resumes, or is cleared or compacted. Session compaction shortens older conversation details to make room for new work.

In plain words
What is it for?
Running setup or initialization steps at startup, resume, clear, and compact events.
Why use it?
It prepares the session automatically whenever one of these session events occurs.

Hook for Claude CodeCursor

Written for Claude Code and Cursor: ${CLAUDE_PLUGIN_ROOT} variable, but also shipped in a Cursor plugin.

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 ring-default plugin — 23 skills, 2 agents, 1 hook shipped together

not rated 217repo 2d ago A scan tokens not measured original Apache-2.0

Good fit Running setup or initialization steps at startup, resume, clear, and compact events.

Compare 6 hooks from other repositories ↓
View source ↗ LerianStudio/ring lerian.studio
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 LerianStudio/ring
Claude Code
/plugin install ring-default

Made for: Claude Code, Cursor.

Or install ring-default, the plugin that ships this one along with the rest of its 23 skills, 2 agents, 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/lerianstudio/ring/session-start/github.svg)](https://agentmods.dev/hooks/lerianstudio/ring/session-start)
Your own site
<a href="https://agentmods.dev/hooks/lerianstudio/ring/session-start"><img src="https://agentmods.dev/badge/hooks/lerianstudio/ring/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/lerianstudio/ring/session-start"><img src="https://agentmods.dev/badge/hooks/lerianstudio/ring/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 1mo 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.

default/hooks/hooks.json · 13 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "clear|compact|startup|resume",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/session-start.sh"
        }
      ]
    }
  ]
}
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. 1mo ago First seen · 13 lines scan A 7e8c4e11e3b7

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository LerianStudio/ring (217 stars, last pushed 2d ago), 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. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Claude CodeCode reviewai-agentsai-codingcode-qualitydeveloper-tools
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