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 alexgreensh/token-optimizer/plugin install to-hook-probeWrote 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/alexgreensh/token-optimizer/session-end)<a href="https://agentmods.dev/hooks/alexgreensh/token-optimizer/session-end"><img src="https://agentmods.dev/badge/hooks/alexgreensh/token-optimizer/session-end.svg" alt="Measured on agentmods" height="20"></a>Grade A, and why
SessionEnd 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What else hooks.json configures
This page is one entry in a file that holds 13. Installing the file brings all of them; each is measured and scanned on its own page.
- Hook CwdChanged A not measured
- Hook Notification A not measured
- Hook PostCompact A not measured
- Hook PostToolUse A not measured
- Hook PreCompact A not measured
- Hook PreToolUse A not measured
- Hook SessionStart A not measured
- Hook Stop A not measured
- Hook StopFailure 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.
- 4d ago First seen · 13 lines scan A fdd56a27ffa9
SessionEnd is a hook published in the GitHub repository alexgreensh/token-optimizer (2,146 stars, last pushed today), with no licence file. 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 ^new_context$ tool calls, executing launch.py via python3. From hehee9/codex-compressor.
PreCompact
Runs before the context is compacted, executing pre-compact.sh via bash. From superuser-pal/awesome-second-brain.
UserPromptSubmit
Runs when you submit a prompt, before the agent sees it, executing run.sh via sh. From Digital-Threads/token-pilot.
PostCompact
Runs after the context is compacted for ^(auto and manual)$ tool calls, executing launch.py via python3. From hehee9/codex-compressor.
PostToolUse
Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.
SessionStart
Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.