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SessionStart

SessionStart is a hook for coding agents from nagisanzenin/engram. Its token cost is not measured, scanned A, a copy of SessionStart, MIT.

A session-start hook that runs a shell script when an agent session starts, resumes, is cleared, or is compacted.

In plain words
What is it for?
It is for running the listed session-start script during startup, resume, clear, and compact events.
Why use it?
It provides one automatic place to perform setup or refresh work at these session events.

Hook

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 engram plugin — 3 skills, 3 agents, 1 hook shipped together

not rated 1.4k +9 7d ago A scan tokens not measured copy · 88% MIT
View the source file nagisanzenin/engram
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 nagisanzenin/engram
Claude Code
/plugin install engram

Or install engram, the plugin that ships this one along with the rest of its 3 skills, 3 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/nagisanzenin/engram/session-start.svg)](https://agentmods.dev/hooks/nagisanzenin/engram/session-start)
Your own site
<a href="https://agentmods.dev/hooks/nagisanzenin/engram/session-start"><img src="https://agentmods.dev/badge/hooks/nagisanzenin/engram/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. Scan, not verified.
Origin 88% 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 4d 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

This is a copy

88% identical to SessionStart — 3 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.

hooks/hooks.json · 14 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "startup|resume|clear|compact",
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/session-start.sh\"",
          "timeout": 10
        }
      ]
    }
  ]
}
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. 4d ago First seen · 14 lines scan A 06860969d4bc

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository nagisanzenin/engram (1,394 stars, last pushed 7d 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. It is 88% identical to SessionStart, differing in 3 lines, and is treated as a copy.

claude-codeclaude-code-pluginfsrslearninglearning-science
Related

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Stop

Runs when the agent finishes a response, running python3. From dbc-oduffy/coordinator-claude.

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Stop

Runs when the agent finishes a response, executing find-node.sh via bash (14 commands). From speson/not-my-reforge.

speson/not-my-reforge · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing tone-filter.py via python3. From zircote-plugins/tone-police.

zircote-plugins/tone-police · not measured