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/cdeust/session-optimizer/session-startgit clone --depth 1 https://github.com/cdeust/session-optimizerGrade 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 yesterday.
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.
What it actually says
{
"SessionStart": [
{
"matcher": "startup",
"hooks": [
{
"type": "command",
"command": "echo '[session-optimizer] DEPRECATED (v2.0.0): this meta plugin no longer provides any hooks. It split into three independent plugins on the same marketplace - context-guard (Stop-hook context budget + memory-writer checkpoint subagent + subagent spend tracker), refine-gate (UserPromptSubmit prompt-binding gate + /refine skill), and statusline (multi-line status bar; run its statusline skill to install). Tell the user to install the plugins they want, then uninstall session-optimizer to silence this notice.'",
"timeout": 5
}
]
}
]
}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.
- yesterday First seen · 14 lines scan A 8c63199886ca
SessionStart is a hook published in the GitHub repository cdeust/session-optimizer (1 stars, last pushed 7d 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 2026-08-31.
Other hooks, from other repositories
Stop
Runs when the agent finishes a response, executing checkpoint-counter.sh via bash. From sofumel/claude-handoff-revive.
PostToolUse
Runs after a tool call finishes, executing usage-monitor.sh via bash. From sofumel/claude-handoff-revive.
PreCompact
Runs before the context is compacted for auto tool calls, executing precompact-nudge.sh. From vonargo/containuity.
SessionStart
Runs when a session starts on compact and resume, executing session-rehydrate.sh. From vonargo/containuity.
SessionStart
Runs when a session starts, executing session-start.sh via bash. From sofumel/claude-handoff-revive.
PreCompact
Runs before the context is compacted, executing pre-compact.sh via bash. From sofumel/claude-handoff-revive.