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SessionStart

SessionStart is a hook for coding agents from hnikoloski/imlazy. Its token cost is not measured, scanned A, a copy of SessionStart, MIT.

A startup hook that runs a command when a coding session starts, is cleared, or is compacted. A hook is an automatic action tied to one of these session events.

In plain words
What is it for?
Use it to run the project's session-start command during startup, after clearing a session, or after shortening its history.
Why use it?
It lets a project perform setup or other repeatable work automatically instead of relying on the developer to remember it each time.

Hook

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the imlazy plugin — 26 skills, 1 command, 1 hook shipped together

not rated 2 1mo ago A scan tokens not measured copy · 86% MIT
View the source file hnikoloski/imlazy
Install

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.

Claude Code
/plugin marketplace add hnikoloski/imlazy
Claude Code
/plugin install imlazy

Or install imlazy, the plugin that ships this one along with the rest of its 26 skills, 1 command, 1 hook.

Wrote 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.

agentmods badge for SessionStart

README.md
[![agentmods](https://agentmods.dev/badge/hooks/hnikoloski/imlazy/session-start.svg)](https://agentmods.dev/hooks/hnikoloski/imlazy/session-start)
Your own site
<a href="https://agentmods.dev/hooks/hnikoloski/imlazy/session-start"><img src="https://agentmods.dev/badge/hooks/hnikoloski/imlazy/session-start.svg" alt="Measured on agentmods" height="20"></a>
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 86% copy Near-identical to another mod 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 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.

Origin

This is a copy

86% identical to SessionStart — 1 line differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

hooks/hooks.json · 14 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "startup|clear|compact",
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/run-hook.cmd\" session-start",
          "async": false
        }
      ]
    }
  ]
}
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. 4d ago First seen · 14 lines scan A 5d3b0000f9a6

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository hnikoloski/imlazy (2 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. It is 86% identical to SessionStart, differing in 1 line, and is treated as a copy.

agent-orchestratoragent-skillsagent-skills-managerclaude-codecodex-clideveloper-tools
Related

Other hooks, from other repositories

SessionStart

Runs when a session starts on compact, executing post-compact-context.py, map-memory-finalize.py and map-memory-recall.py (3 commands). From azalio/map-framework.

azalio/map-framework · not measured

PostToolUse

Runs after a tool call finishes for Edit, Write, MultiEdit and Bash tool calls, executing ralph-iteration-logger.py. From azalio/map-framework.

azalio/map-framework · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing license_prompt_guard.py and run_if_licensed.py via uv with --no-project, --python and --exec (3 commands). From maxritter/pilot-shell.

maxritter/pilot-shell · not measured

PreToolUse

Runs before the agent uses a tool for ^new_context$ tool calls, executing launch.py via python3. From hehee9/codex-compressor.

hehee9/codex-compressor · not measured

SubagentStart

Runs when a subagent starts, running an inline shell check. From goondocks-co/open-agent-kit.

goondocks-co/open-agent-kit · not measured

PostToolUseFailure

Runs when a tool call fails, executing EventLogger.hook.ts and AlgorithmNudge.hook.ts (2 commands). From DorShaer/Husk.

DorShaer/Husk · not measured