What is SessionStart?

A hook that runs three shell scripts when an agent session starts. One script checks whether another session owns the checkout, another loads session data, and a third records an observation event.

Claiming a session lock, loading session-start information, and sending a session-start observation through the referenced shell scripts.

It helps detect competing sessions and prepare or observe the session before work begins. The input does not describe what data the loading script restores.

SessionStart — Hook by LucasSantana-Dev

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.

agentmods

npx agentmods add hooks/lucassantana-dev/sharekit/session-start

Clone the repo

git clone --depth 1 https://github.com/LucasSantana-Dev/sharekit

Made for: Claude Code.

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. Scan, not verified.

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 yesterday.

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.

sharekit-profile/.claude/settings.json · 24 lines

What it actually says

{
  "SessionStart": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "bash \"$HOME/.claude/hooks/check-session-lock.sh\" --claim",
          "timeout": 5000,
          "comment": "Session-lock sentinel: warns if another live session owns this checkout"
        },
        {
          "type": "command",
          "command": "bash \"$HOME/.claude/hooks/session-start-load.sh\"",
          "timeout": 10000
        },
        {
          "type": "command",
          "command": "OBSERVE_HOOK_EVENT=SessionStart bash \"$HOME/.claude/hooks/observe-otel.sh\"",
          "timeout": 2000
        }
      ]
    }
  ]
}

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.

yesterday First seen · 24 lines scan A 0e6c7f5e0c6c

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository LucasSantana-Dev/sharekit (1 stars, last pushed yesterday), 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 2026-08-31.

E-commerce ai ai-setup claude-code cli cursorrules developer-tools

SessionStart

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

Stop

PostToolUse

SessionStart

SessionStart

PreToolUse

SessionStart