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SessionStart

SessionStart is a hook for coding agents from pengzhangzhi/superpowers-ml. Its token cost is not measured, scanned A, a copy of SessionStart, MIT.

A startup hook that runs a command when a session starts, is cleared, or is compacted.

In plain words
What is it for?
Use it to run the configured session-start command when the coding session begins or its context is reset.
Why use it?
It makes a chosen session-start action happen automatically at those lifecycle points.

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 superpowers-ml plugin — 17 skills, 1 hook shipped together

not rated 8 5d ago A scan tokens not measured copy · 86% MIT
View the source file pengzhangzhi/superpowers-ml
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 pengzhangzhi/superpowers-ml
Claude Code
/plugin install superpowers-ml

Or install superpowers-ml, the plugin that ships this one along with the rest of its 17 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/pengzhangzhi/superpowers-ml/session-start.svg)](https://agentmods.dev/hooks/pengzhangzhi/superpowers-ml/session-start)
Your own site
<a href="https://agentmods.dev/hooks/pengzhangzhi/superpowers-ml/session-start"><img src="https://agentmods.dev/badge/hooks/pengzhangzhi/superpowers-ml/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 86% 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 5d 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

86% identical to SessionStart — 1 line 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|clear|compact",
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/run-hook.cmd\" session-start",
          "async": false
        }
      ]
    }
  ]
}
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. 5d ago First seen · 14 lines scan A 5d3b0000f9a6

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository pengzhangzhi/superpowers-ml (8 stars, last pushed 5d 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 86% identical to SessionStart, differing in 1 line, and is treated as a copy.

agent-skillsclaude-codemachine-learningml-research
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Bash tool calls, executing format.sh. From zenml-io/zenml.

zenml-io/zenml · not measured

PreCompact

Runs before the context is compacted, running swarm claude pre-compact. From joelhooks/swarm-tools.

joelhooks/swarm-tools · not measured

Stop

Runs when the agent finishes a response, running swarm claude agent-stop. From joelhooks/swarm-tools.

joelhooks/swarm-tools · not measured

SessionEnd

Runs when a session ends, executing session-end.cjs via node. From cybertronai/SutroYaro.

cybertronai/SutroYaro · not measured

PostCompact

Runs after the context is compacted, running TOKKI_LAUNCHER_NO_UPDATE=1 tokki hooks claude-ingest --event. From ThalesGroup/agilab.

ThalesGroup/agilab · not measured

SessionEnd

Runs when a session ends, running TOKKI_LAUNCHER_NO_UPDATE=1 tokki hooks claude-ingest --event. From ThalesGroup/agilab.

ThalesGroup/agilab · not measured