agentmods.dev

SessionStart

A session-start hook that runs two shell checks when a coding-agent session begins, including loading Plastic context and checking for updates.

In plain words
What is it for?
Use it to load project context and run an update check whenever a session starts.
Why use it?
It automatically performs setup checks at the start of each session instead of relying on the agent to remember them.

Hook

10 2d ago A scan tokens not measured original MIT
View the source file zalom/plastic
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/zalom/plastic/session-start
Clone the repo
git clone --depth 1 https://github.com/zalom/plastic
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 · 19 lines

What it actually says

{
  "SessionStart": [
    {
      "matcher": "",
      "hooks": [
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/run-hook\" session-start",
          "statusMessage": "Loading Plastic context..."
        },
        {
          "type": "command",
          "command": "\"${CLAUDE_PLUGIN_ROOT}/hooks/check-update\"",
          "statusMessage": ""
        }
      ]
    }
  ]
}
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 · 19 lines scan A b99b5094bebf

Subscribe to this mod's changes

SessionStart is a hook published in the GitHub repository zalom/plastic (10 stars, last pushed 2d 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 contextai-agentsai-codingclaude-codedeveloper-toolsintent-drivenproject-memory
Related

Other hooks, from other repositories

PostToolUse

Runs after a tool call finishes, executing wmux-bridge.mjs via node. From openwong2kim/wmux.

openwong2kim/wmux · not measured

SessionEnd

Runs when a session ends, executing session-lifecycle-hook.mjs via node. From sendbird/cc-plugin-codex.

sendbird/cc-plugin-codex · not measured

PreToolUse

Runs before the agent uses a tool for Bash, Write, Edit, Bash, Task, Task and Agent tool calls, executing run-py.sh and context-warning.sh via bash (4 commands). From primeline-ai/evolving-lite.

primeline-ai/evolving-lite · not measured

SessionStart

Runs when a session starts, executing coaltipple-conductor.js via node. From TheColliery/CoalTipple.

TheColliery/CoalTipple · not measured

PostToolUse

Runs after a tool call finishes, running memorix hook. From AVIDS2/memorix.

AVIDS2/memorix · not measured

BeforeTool

Runs on the BeforeTool event for write_file, replace, run_shell_command and shell tool calls, executing before-tool.js via node. From richardcb/oh-my-gemini.

richardcb/oh-my-gemini · not measured