agentmods.dev

SessionStart

A startup check for a coding session that shows the repository’s changed files and whether Git hooks are installed.

In plain words
What is it for?
Use it when opening a project to check its status and confirm that pre-commit and pre-push hooks are available.
Why use it?
It makes the repository’s initial state visible and warns when expected Git checks are missing.

Hook for Claude Code

66 5mo ago A scan tokens not measured original MIT
View the source file jrenaldi79/harness-engineering
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/jrenaldi79/harness-engineering/session-start
Clone the repo
git clone --depth 1 https://github.com/jrenaldi79/harness-engineering

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 original 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 2d 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.

.claude/settings.json · 8 lines

What it actually says

{
  "SessionStart": [
    {
      "type": "command",
      "command": "echo 'Session start: checking repo state...' && git status --short && echo 'Hooks installed:' && ls -1 .git/hooks/pre-commit .git/hooks/pre-push 2>/dev/null || echo 'WARNING: Git hooks not installed. Run: bash scripts/install-hooks.sh'"
    }
  ]
}
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. 2d ago First seen · 8 lines scan A 8c48e8ac52a0

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository jrenaldi79/harness-engineering (66 stars, last pushed 5mo 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 2026-08-30.

Git and workflowWriting and docsagents-mdai-agentsai-codingclaude-codeclaude-mdcodex
Related

Other hooks, from other repositories

SessionStart

Runs when a session starts, executing reinject-rules.mjs via node. From syf2211/ruledoctor.

syf2211/ruledoctor · not measured

PreToolUse

Runs before the agent uses a tool for Bash tool calls, executing rule-guard.mjs via node. From syf2211/ruledoctor.

syf2211/ruledoctor · not measured

SessionStart

Runs when a session starts, executing check_repo_latest.sh via bash. From chocomyong/harness-kit.

chocomyong/harness-kit · not measured

SessionStart

Runs when a session starts, executing scan-agents-md.sh. From hexsprite/claude-agents-md.

hexsprite/claude-agents-md · not measured

SessionStart

Runs when a session starts on compact, executing post-compact-context.sh via bash. From aleolidev/claude-react-kit.

aleolidev/claude-react-kit · not measured

PreCompact

Runs before the context is compacted, executing reinject-rules.mjs via node. From syf2211/ruledoctor.

syf2211/ruledoctor · not measured