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.
npx agentmods add hooks/christopherlouet/claude-base/session-startgit clone --depth 1 https://github.com/christopherlouet/claude-baseWrote 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.
[](https://agentmods.dev/hooks/christopherlouet/claude-base/session-start)<a href="https://agentmods.dev/hooks/christopherlouet/claude-base/session-start"><img src="https://agentmods.dev/badge/hooks/christopherlouet/claude-base/session-start.svg" alt="Measured on agentmods" height="20"></a>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 today.
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.
How it starts
The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.
{
"SessionStart": [
{
"description": "Display project information at startup",
"hooks": [
{
"type": "command",
"command": "bash -c 'echo \"=== Claude Code Session ===\"; if [ -f VERSION ]; then echo \"Version: $(cat VERSION)\"; fi; if [ -d .claude/commands ]; then echo \"Commandes: $(find .claude/commands -name \"*.md\" -type f 2>/dev/null | wc -l | tr -d \" \")\"; fi; if [ -d .claude/agents ]; then echo \"Agents: $(find .claude/agents -name \"*.md\" -type f 2>/dev/null | wc -l | tr -d \" \")\"; fi; echo \"===========================\"'",
"timeout": 5000
}
]
},
{
"description": "Check that node_modules exists if package.json present",
"hooks": [
{
"type": "command",
"command": "bash -c 'if [ -f package.json ] && [ ! -d node_modules ]; then echo \"[ALERT] node_modules missing. Run: npm install\"; fi'",
"timeout": 3000
}
]
},
{
"description": "Check that .env is in .gitignore if present",
"hooks": [
{
"type": "command",
"command": "bash -c 'if [ -f .env ] && [ -f .gitignore ]; then if ! grep -qE \"^\\.env$|^\\*\\.env$\" .gitignore; then echo \"[SECURITY] .env exists but is not in .gitignore! Add it to avoid committing secrets.\"; fi; fi'",
"timeout": 3000
}
]
},
{
"description": "Warn if the project contains custom hooks",
"hooks": [
{
"type": "command",
"command": "bash -c 'if [ -f .claude/settings.local.json ]; then echo \"[INFO] Hooks personnalises detectes dans .claude/settings.local.json - verifiez leur contenu si ce depot n est pas de confiance.\"; fi'",
"timeout": 3000
}
]
},
{
"description": "Probe Claude Code version for the output rewriter (requires 2.1.121+). Writes a sentinel consumed by post-edit and bash-output rewriter hooks.",
"hooks": [
{
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.
- today First seen · 64 lines scan A 8a1f5064bdbf
SessionStart is a hook published in the GitHub repository christopherlouet/claude-base (5 stars, last pushed today), 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 2026-09-03.
Other hooks, from other repositories
PostToolUse
Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.
SessionStart
Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.
SessionStart
Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.
PreToolUse
Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From apache/superset.
PreToolUse
Runs before the agent uses a tool, executing pre-write.sh and pre-bash.sh (2 commands). From anthropics/claude-cookbooks.
SessionStart
Runs when a session starts, executing session-start.sh. From anthropics/claude-cookbooks.