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/geml-spec/geml/session-startgit clone --depth 1 https://github.com/geml-spec/gemlGrade 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.
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 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 · 12 lines scan A f706cfd800ac
SessionStart is a hook published in the GitHub repository geml-spec/geml (25 stars, last pushed 2d ago), 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
SessionStart
Runs when a session starts, executing session-start.js via node. From raccioly/docguard.
SessionStart
Runs when a session starts on startup, running an inline shell check. From nicholasglazer/gnosis-mcp.
SessionEnd
Runs when a session ends, executing session-end.sh. From mem9-ai/mem9.
PreToolUse
Runs before the agent uses a tool, executing pre-commit-hook.py via python3. From SummerSec/SumSec-Skills.
PreToolUse
Runs before the agent uses a tool for Edit tool calls, running echo 'REMINDER: Did you Read this file in the current contex. From kaltura/kaltura-agents-api-guides.
PreToolUse
Runs before the agent uses a tool for Grep tool calls, running an inline shell check. From walkindude/gosymdb.