It restores project setup, handoff information, and saved knowledge across session changes so the agent can continue with relevant context.

SessionStart — Hook for Claude Code by joenandez/spectre

SessionStart

SessionStart is a hook for Claude Code from joenandez/spectre. Its token cost is not measured, scanned A, original, MIT.

A startup hook that runs setup and knowledge-loading scripts when an agent session starts, resumes, is cleared, or is compacted.

In plain words

What is it for?: Use it to configure automatic bootstrap, handoff recovery, and knowledge loading through Node.js commands.
Why use it?: It restores project setup, handoff information, and saved knowledge across session changes so the agent can continue with relevant context.

Written for Claude Code: SessionStart hook event. Also seen: mentions Codex.

Good fit Use it to configure automatic bootstrap, handoff recovery, and knowledge loading through Node.js commands.

Compare 6 hooks from other repositories ↓

Install with agentmods

npx agentmods add hooks/joenandez/spectre/session-start

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.

Clone the repo

git clone --depth 1 https://github.com/joenandez/spectre

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/hooks/joenandez/spectre/session-start/github.svg)](https://agentmods.dev/hooks/joenandez/spectre/session-start)

Your own site

<a href="https://agentmods.dev/hooks/joenandez/spectre/session-start"><img src="https://agentmods.dev/badge/hooks/joenandez/spectre/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.

Your own site · 80×15

<a href="https://agentmods.dev/hooks/joenandez/spectre/session-start"><img src="https://agentmods.dev/badge/hooks/joenandez/spectre/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 2mo 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

Copies of this mod

1 near-identical copy found in the catalogue:

PostToolUse — 86% identical, 16 lines differ

plugins/spectre-codex/hooks/hooks.json · 26 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "startup|resume|clear|compact",
      "hooks": [
        {
          "type": "command",
          "command": "node ${PLUGIN_ROOT}/hooks/scripts/bootstrap.mjs"
        },
        {
          "type": "command",
          "command": "node ${PLUGIN_ROOT}/hooks/scripts/handoff-resume.mjs"
        }
      ]
    },
    {
      "matcher": "startup|clear|compact",
      "hooks": [
        {
          "type": "command",
          "command": "node ${PLUGIN_ROOT}/hooks/scripts/load-knowledge.mjs --host codex"
        }
      ]
    }
  ]
}

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.

2mo ago First seen · 26 lines scan A c288386e593c

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository joenandez/spectre (164 stars, last pushed 1mo 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. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

SessionStart next to 6 hooks from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
SessionStartjoenandez/spectre	Hook	164	1mo ago	MIT	A	—	Claude Code
PostToolUsesupabase/supabase	Hook	115k	today	Apache-2.0	A	—	Claude Code
SessionStartsupabase/supabase	Hook	115k	today	Apache-2.0	A	—	Claude Code
SessionStartgoogle-gemini/gemini-cli	Hook	109k	today	Apache-2.0	A	—	Claude Code
PreToolUseapache/superset	Hook	75k	today	Apache-2.0	A	—	Claude Code
PreToolUseanthropics/claude-cookbooks	Hook	54k	2d ago	MIT	A	—	Claude Code
PostToolUseanthropics/claude-plugins-official	Hook	46k	yesterday	Apache-2.0	A	—	Claude Code