agentmods.dev

SessionStart

A startup hook that runs a Bash script when a coding session begins. A worktree is a separate working copy of a code repository.

In plain words
What is it for?
It runs scripts/worktree-bootstrap.sh during startup to bootstrap the working copy.
Why use it?
It automates setup work at the start of each session, so the project can be prepared before you begin coding.

Hook for Claude Code

104 1mo ago A scan tokens not measured original MIT
View the source file gintasz/unigent
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/gintasz/unigent/session-start
Clone the repo
git clone --depth 1 https://github.com/gintasz/unigent

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 · 15 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "startup",
      "hooks": [
        {
          "type": "command",
          "command": "bash scripts/worktree-bootstrap.sh",
          "timeout": 600,
          "statusMessage": "Bootstrapping worktree…"
        }
      ]
    }
  ]
}
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 · 15 lines scan A a79c071971e7

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository gintasz/unigent (104 stars, last pushed 1mo 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 workflowMemory and contextWriting and docsagentai-agentclaude-codecontext-engineeringcontext-windowdynamic-workflows
Related

Other hooks, from other repositories

SessionStart

Runs when a session starts on startup and resume, running headroom init hook ensure. From headroomlabs-ai/headroom.

headroomlabs-ai/headroom · not measured

PreToolUse

Runs before the agent uses a tool for Bash and PowerShell tool calls, running headroom init hook ensure. From headroomlabs-ai/headroom.

headroomlabs-ai/headroom · not measured

SessionStart

Runs when a session starts, executing hook-handler.cjs via node. From memodb-io/Acontext.

memodb-io/Acontext · not measured

PostToolUse

Runs after a tool call finishes, executing hook-handler.cjs via node. From memodb-io/Acontext.

memodb-io/Acontext · not measured

Notification

Runs when the agent sends a notification, executing hook-handler.cjs via node. From memodb-io/Acontext.

memodb-io/Acontext · not measured

Stop

Runs when the agent finishes a response, executing hook-handler.cjs via node. From memodb-io/Acontext.

memodb-io/Acontext · not measured