agentmods.dev

SessionStart

A session-start hook that runs a Python script whenever a coding-agent session begins.

In plain words
What is it for?
Use it to run the configured session_start_chat_id.py script before work begins.
Why use it?
It automates setup work that should happen at the start of every session.

Hook

1.1k 2d ago A scan tokens not measured original Apache-2.0
View the source file fcakyon/claude-codex-settings
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/fcakyon/claude-codex-settings/session-start
Clone the repo
git clone --depth 1 https://github.com/fcakyon/claude-codex-settings
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 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.

plugins/claude-telemetry-hooks/hooks/hooks.json · 13 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "*",
      "hooks": [
        {
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/hooks/scripts/session_start_chat_id.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.

  1. yesterday First seen · 13 lines scan A 539e391e8f83

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository fcakyon/claude-codex-settings (1,114 stars, last pushed 2d 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.

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Related

Other hooks, from other repositories

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Runs when a session starts on startup, resume, clear and compact, executing session-start.sh via bash. From craigcossairt/trellis.

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Runs when you submit a prompt, before the agent sees it, executing context-enrichment.sh via bash. From craigcossairt/trellis.

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PostToolUse

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PostToolUse

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PreToolUse

Runs before the agent uses a tool for Write, Edit and MultiEdit tool calls, executing protect-credentials.sh. From alex-lamport/kaora-memory.

alex-lamport/kaora-memory · not measured

SessionStart

Runs when a session starts on startup, clear and compact, executing run-hook.cmd. From Leodorareluctant259/superpowers-zh.

Leodorareluctant259/superpowers-zh · not measured