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 yuting0624/antigravity-for-claude-code/plugin install antigravityWrote 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/yuting0624/antigravity-for-claude-code/session-start)<a href="https://agentmods.dev/hooks/yuting0624/antigravity-for-claude-code/session-start"><img src="https://agentmods.dev/badge/hooks/yuting0624/antigravity-for-claude-code/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 4d 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
64% identical to SessionStart — 24 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",
"hooks": [
{
"type": "command",
"command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/check-agy.sh\""
}
]
},
{
"matcher": "startup",
"hooks": [
{
"type": "command",
"command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/inject-policy.sh\""
}
]
},
{
"matcher": "compact",
"hooks": [
{
"type": "command",
"command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/inject-policy.sh\""
}
]
}
]
}What else hooks.json configures
This page is one entry in a file that holds 2. 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.
- 4d ago First seen · 31 lines scan A 3d5ef4a906be
SessionStart is a hook published in the GitHub repository yuting0624/antigravity-for-claude-code (305 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. It is 64% identical to SessionStart, differing in 24 lines, and is treated as a copy.
Other hooks, from other repositories
SessionStart
Runs when a session starts, executing check_env.py via python. From Ibrahim-3d/nano-banana-claude-plugin.
SessionStart
Runs when a session starts, executing session-lifecycle-hook.mjs via node. From markbrutx/gemini-plugin-cc.
SessionEnd
Runs when a session ends, executing session-lifecycle-hook.mjs via node. From markbrutx/gemini-plugin-cc.
Stop
Runs when the agent finishes a response, executing stop-review-gate-hook.mjs via node. From markbrutx/gemini-plugin-cc.
PreToolUse
Runs before the agent uses a tool for ExitPlanMode, Task and Write tool calls, executing plan-peer-review-check.sh, task-peer-review-check.sh and write-peer-review-check.sh via bash (3 commands). From slb350/gemini-peer-review.
SessionStart
Runs when a session starts, executing peer-review-reminder.sh via bash. From slb350/gemini-peer-review.