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 NodeNestor/claude-rolling-context/plugin install rolling-contextWrote 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/nodenestor/claude-rolling-context/session-start)<a href="https://agentmods.dev/hooks/nodenestor/claude-rolling-context/session-start"><img src="https://agentmods.dev/badge/hooks/nodenestor/claude-rolling-context/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.
What it actually says
{
"SessionStart": [
{
"hooks": [
{
"type": "command",
"command": "powershell -ExecutionPolicy Bypass -File \"${CLAUDE_PLUGIN_ROOT}/hooks/start-proxy.ps1\" 2>/dev/null || bash \"${CLAUDE_PLUGIN_ROOT}/hooks/start-proxy.sh\" 2>/dev/null",
"timeout": 30
}
]
}
]
}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 · 13 lines scan A 65ff23ab2cc4
SessionStart is a hook published in the GitHub repository NodeNestor/claude-rolling-context (31 stars, last pushed yesterday), 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 2026-08-30.
Other hooks, from other repositories
PreToolUse
Runs before the agent uses a tool for Bash, shell_command, exec_command, unified_exec, apply_patch, Write and Edit tool calls, executing pre-tool-adapter.py via python3 (2 commands). From arbiterForge/codeArbiter.
SessionStart
Runs when a session starts, executing update-check.js via node. From KevinZai/commander.
PostCompact
Runs after the context is compacted, running an inline shell check. From christopherlouet/claude-base.
PreToolUse
Runs before the agent uses a tool for Write, Edit, Bash, Agent, Task, SendMessage and TaskStop tool calls, running bash (3 commands). From modu-ai/moai-adk.
PreToolUse
Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From roboticforce/sugar.
BeforeTool
Runs on the BeforeTool event for write_file, replace, run_shell_command and shell tool calls, executing before-tool.js via node. From richardcb/oh-my-gemini.