agentmods.dev

SessionStart

A command that runs automatically when an agent session starts, resumes, is cleared, or is shortened to fit available context.

In plain words
What is it for?
Use it to run repeatable startup or handoff preparation whenever a coding session begins or resumes.
Why use it?
It prepares the session with information from a Python startup script so work can begin with the expected setup.

Hook

4 1mo ago A scan tokens not measured original MIT
View the source file AbdurRafay2004/handoff
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/abdurrafay2004/handoff/session-start
Clone the repo
git clone --depth 1 https://github.com/AbdurRafay2004/handoff
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.

hooks/hooks.json · 14 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "startup|resume|clear|compact",
      "hooks": [
        {
          "type": "command",
          "command": "python3 \"${CLAUDE_PLUGIN_ROOT}/hooks/sessionstart.py\"",
          "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. 2d ago First seen · 14 lines scan A dab195498127

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository AbdurRafay2004/handoff (4 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 2026-08-31.

Memory and contextProductivityclaude-codeclaude-code-plugincontext-engineeringdeveloper-toolshooksproject-memory
Related

Other hooks, from other repositories

PreToolUse

Runs before the agent uses a tool for Edit, Write and Read tool calls, executing conditional_rules_pre.py via python3. From juntossomosmais/pommel.

juntossomosmais/pommel · not measured

PostToolUse

Runs after a tool call finishes for Edit, Write and Read tool calls, executing conditional_rules_post.py via python3. From juntossomosmais/pommel.

juntossomosmais/pommel · not measured

SessionStart

Runs when a session starts on startup, resume, clear and compact, executing conditional_rules_session.py via python3. From juntossomosmais/pommel.

juntossomosmais/pommel · not measured

PreCompact

Runs before the context is compacted, executing checkpoint.js via node. From yanfeid/claude-amber.

yanfeid/claude-amber · not measured

SessionStart

Runs when a session starts on compact and resume, executing restore.js via node. From yanfeid/claude-amber.

yanfeid/claude-amber · not measured

SessionEnd

Runs when a session ends, executing checkpoint.js via node. From yanfeid/claude-amber.

yanfeid/claude-amber · not measured