What is SessionStart?

A session-start hook that runs a Python bootstrap script when a coding-agent session begins. A hook is an automatic command triggered by a particular event.

Running the specified bootstrap process at the beginning of each session.

It performs the configured startup step automatically, so the session does not depend on someone running the script by hand.

SessionStart — Hook for coding agents by ifixai-ai: A session-start hook that runs a Python bootstrap script…

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/ifixai-ai/ifixai/session-start

Clone the repo

git clone --depth 1 https://github.com/ifixai-ai/iFixAi

Or install ifixai, the plugin that ships this one along with the rest of its 1 skill, 1 hook.

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 3d 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

Copies of this mod

2 near-identical copies found in the catalogue:

PostToolUse — 88% identical, 37 lines differ
UserPromptSubmit — 86% identical, 15 lines differ

plugin/hooks/hooks.json · 15 lines

What it actually says

{
  "SessionStart": [
    {
      "hooks": [
        {
          "type": "command",
          "command": "python3",
          "args": [
            "${CLAUDE_PLUGIN_ROOT}/hooks/bootstrap.py"
          ]
        }
      ]
    }
  ]
}

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.

3d ago First seen · 15 lines scan A 7d4ad5494438

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository ifixai-ai/iFixAi (12,448 stars, last pushed 5d ago), licensed Apache-2.0. 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.

agent-evaluation ai ai-alignment ai-evaluation ai-governance diagnostic-tool

SessionStart

Getting it into your agent

Grade A, and why

Nothing flagged

Copies of this mod

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

PreToolUse

PreToolUse

SessionStart

SubagentStop

SessionEnd

PostToolBatch