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.
/plugin marketplace add SeongwoongCho/adaptive-harness/plugin install adaptive-harnessWrote 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/seongwoongcho/adaptive-harness/session-start)<a href="https://agentmods.dev/hooks/seongwoongcho/adaptive-harness/session-start"><img src="https://agentmods.dev/badge/hooks/seongwoongcho/adaptive-harness/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 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.
This is a copy
92% 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.
What it actually says
{
"SessionStart": [
{
"matcher": "startup|resume|clear|compact",
"hooks": [
{
"type": "command",
"command": "${CLAUDE_PLUGIN_ROOT}/hooks/session-start.sh",
"timeout": 5
}
]
}
]
}What else hooks.json configures
This page is one entry in a file that holds 5. Installing the file brings all of them; each is measured and scanned on its own page.
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.
- 5d ago First seen · 14 lines scan A 21e3bc180903
SessionStart is a hook published in the GitHub repository SeongwoongCho/adaptive-harness (8 stars, last pushed 5mo 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 92% identical to SessionStart, differing in 3 lines, and is treated as a copy.
Other hooks, from other repositories
PostToolUse
Runs after a tool call finishes for Edit and Write tool calls, running an inline shell check. From KhazP/vibe-coding-prompt-template.
Stop
Runs when the agent finishes a response, executing stop_report_hook.sh, tmux_signal_stop_receipt.sh and session_stop_rotation.py via bash with --show-toplevel (3 commands). From Vinix24/vnx-orchestration.
SessionStart
Runs when a session starts, running an inline shell check. From hbkdad/arc.
Notification
Runs when the agent sends a notification for permission_prompt, idle_prompt and auth_success tool calls, running cas hook Notification. From codingagentsystem/cas.
SessionEnd
Runs when a session ends, running cas hook SessionEnd. From codingagentsystem/cas.
SubagentStart
Runs when a subagent starts for task-verifier tool calls, running cas hook SubagentStart. From codingagentsystem/cas.