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/jaipatel248/claude-arcade/session-startgit clone --depth 1 https://github.com/jaipatel248/claude-arcadeGrade 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 3d 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.
This is a copy
86% identical to Stop — 2 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.
What it actually says
{
"SessionStart": [
{
"matcher": "",
"hooks": [
{
"type": "command",
"command": "node ${CLAUDE_PLUGIN_ROOT}/scripts/collect.js",
"async": true
}
]
}
]
}What else hooks.json configures
This page is one entry in a file that holds 12. Installing the file brings all of them; each is measured and scanned on its own page.
- Hook Elicitation A not measured
- Hook PermissionRequest A not measured
- Hook PostToolUse A not measured
- Hook PostToolUseFailure A not measured
- Hook PreCompact A not measured
- Hook PreToolUse A not measured
- Hook SessionEnd A not measured
- Hook Stop A not measured
- Hook SubagentStart A not measured
- Hook SubagentStop A not measured
- Hook UserPromptSubmit A not measured
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.
- 3d ago First seen · 14 lines scan A b6295f148480
SessionStart is a hook published in the GitHub repository jaipatel248/claude-arcade (6 stars, last pushed 4mo 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 Stop, differing in 2 lines, and is treated as a copy.
Other hooks, from other repositories
UserPromptSubmit
Runs when you submit a prompt, before the agent sees it, executing run-hook.cmd. From Redtropig/harness-anchor.
PostToolUse
Runs after a tool call finishes for Write tool calls, running an inline shell check (2 commands). From Attemainio/dotnet-toolkit.
PostToolUse
Runs after a tool call finishes for Edit and Write tool calls, executing gate_plan_frontmatter.py and gate_spec_frontmatter.py via uv with --no-project and --script (4 commands). From andyrids/icm-spec.
PreToolUse
Runs before the agent uses a tool for Edit and Write tool calls, executing gate_spec_edit.py and gate_output_naming.py via uv with --no-project and --script (4 commands). From andyrids/icm-spec.
PreCompact
Runs before the context is compacted, executing weft-precompact.sh via bash. From dioptx/weft.
SubagentStart
Runs when a subagent starts, executing subagent-track-start.sh. From AaronCarney/pass-the-baton.