Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add adelaidasofia/imessage-mcp/plugin install imessage-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/hooks/adelaidasofia/imessage-mcp/session-start)<a href="https://agentmods.dev/hooks/adelaidasofia/imessage-mcp/session-start"><img src="https://agentmods.dev/badge/hooks/adelaidasofia/imessage-mcp/session-start.svg" alt="Measured on agentmods" height="20"></a>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 4d 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.
This is a copy
78% identical to PreToolUse — 26 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
{
"SessionStart": [
{
"hooks": [
{
"type": "command",
"command": "python3 ${CLAUDE_PLUGIN_ROOT}/hooks/install-ping.py"
}
]
}
]
}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.
- 4d ago First seen · 12 lines scan A fe6d2b39077b
SessionStart is a hook published in the GitHub repository adelaidasofia/imessage-mcp (2 stars, last pushed 4d 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. It is 78% identical to PreToolUse, differing in 26 lines, and is treated as a copy.
Other hooks, from other repositories
PreToolUse
Runs before the agent uses a tool for Bash tool calls, executing pre_bash.sh. From s-morgan-jeffries/apple-mail-fast-mcp.
PostToolUse
Runs after a tool call finishes for Bash tool calls, executing post_bash.sh. From s-morgan-jeffries/apple-mail-fast-mcp.
SessionStart
Runs when a session starts, executing session_start.sh. From s-morgan-jeffries/apple-mail-fast-mcp.
PreToolUse
Runs before the agent uses a tool for Bash tool calls, executing gate.mjs via node. From marius-cetanas/macos-mail-mcp.
Stop
Runs when the agent finishes a response, executing stop-gate.mjs via node. From marius-cetanas/macos-mail-mcp.
PreToolUse
Runs before the agent uses a tool for Bash tool calls, executing pre_bash.sh. From s-morgan-jeffries/omnifocus-mcp.