agentmods.dev

SessionStart

SessionStart is a hook for coding agents from caozhiyuan/copilot-api. Its token cost is not measured, scanned A, original, MIT.

A session-start hook configuration that runs a Node.js rules script when a coding session begins. Node.js is a runtime for executing JavaScript outside a web browser.

In plain words
What is it for?
Use it to configure automatic startup behavior for the caozhiyuan/copilot-api project.
Why use it?
It automatically applies the project’s startup rules before the agent begins work, so required session setup is not skipped.

Hook

Part of the agent-inject plugin — 3 hooks shipped together

One of 3 entries in hooks.json — they are configured in one file and arrive together.

995 5d ago A scan tokens not measured original MIT
View the source file caozhiyuan/copilot-api
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/caozhiyuan/copilot-api/session-start
Clone the repo
git clone --depth 1 https://github.com/caozhiyuan/copilot-api

Or install agent-inject, the plugin that ships this one along with the rest of its 3 hooks.

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.

plugin/claude/agent-inject/hooks/hooks.json · 13 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "*",
      "hooks": [
        {
          "type": "command",
          "command": "node \"${CLAUDE_PLUGIN_ROOT}/scripts/session-start-rules.js\""
        }
      ]
    }
  ]
}
Same file

What else hooks.json configures

This page is one entry in a file that holds 3. Installing the file brings all of them; each is measured and scanned on its own page.

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. 3d ago First seen · 13 lines scan A 3cd7e0380f16

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository caozhiyuan/copilot-api (995 stars, last pushed 5d 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.

ai-gatewayanthropic-compatiblecodexgithub-copilotopencode
Related

Other hooks, from other repositories

SessionStart

Runs when a session starts on startup and resume, executing deja.sh. From vshulcz/deja-vu.

vshulcz/deja-vu · not measured

PreToolUse

Runs before the agent uses a tool for Edit, Write and MultiEdit tool calls, running an inline shell check. From kevinlin/cowork-z.

kevinlin/cowork-z · not measured

Stop

Runs when the agent finishes a response, executing dag-tripwire.py and ledger-tripwire.py via python3 (2 commands). From Buckeyes22/subagent-model-routing.

Buckeyes22/subagent-model-routing · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, executing route-natural-language-aliases.sh. From loiane/specs-driven-development-spring-angular.

loiane/specs-driven-development-spring-angular · not measured

PreCompact

Runs before the context is compacted, running swarm claude pre-compact. From joelhooks/swarm-tools.

joelhooks/swarm-tools · not measured

UserPromptSubmit

Runs when you submit a prompt, before the agent sees it, running entire hooks claude-code user-prompt-submit. From sunmh207/entire-dashboard.

sunmh207/entire-dashboard · not measured