agentmods.dev

SessionStart

A session-start hook that runs a shell script when a session starts, resumes, is cleared, or is compacted.

In plain words
What is it for?
Running the project's session-start script during startup, resume, clear, and compaction events.
Why use it?
It automates setup or session-related actions at these lifecycle points instead of requiring them to be run manually.

Hook for Claude Code

1 yesterday A scan tokens not measured no licence
View the source file ormastes/simple
Install

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.

agentmods
npx agentmods add hooks/ormastes/simple/session-start
Clone the repo
git clone --depth 1 https://github.com/ormastes/simple

Made for: Claude Code.

Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Security

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 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.

.claude/settings.json · 15 lines

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.

Read it on GitHub

Changes

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.

  1. yesterday First seen · 15 lines scan A e397c266df61

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository ormastes/simple (1 stars, last pushed yesterday), 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 2026-08-31.

gemini-cli-extension
Related

Other hooks, from other repositories

BeforeTool

Runs on the BeforeTool event for tool == "run_shell_command", tool == "run_shell_command", tool == "run_shell_command" && tool_input.command matches "^\\s*(npm (install, test, i, ci), pnpm (install, test, i), yarn (install, test, add, remove, upgrade), bun (install, test, i, add, remove), cargo build, make, docker…

Jamkris/everything-gemini-code · not measured

SessionStart

Runs when a session starts, executing run.js via node. From Jamkris/everything-gemini-code.

Jamkris/everything-gemini-code · not measured

PreCompact

Runs before the context is compacted, executing nmem-hook-save.py with --event. From nowledge-co/community.

nowledge-co/community · not measured

SessionEnd

Runs when a session ends, executing nmem-hook-save.py with --event and --detach. From nowledge-co/community.

nowledge-co/community · not measured

BeforeAgent

Runs on the BeforeAgent event, running python -m securedact_enforced.gemini_hook --event BeforeAgen. From GigantesHJI/securedact-mcp.

GigantesHJI/securedact-mcp · not measured

SessionStart

Runs when a session starts, executing hook.js via node. From yideng-xl/gemini-cli-hud.

yideng-xl/gemini-cli-hud · not measured