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.
npx agentmods add hooks/shakestzd/contextune/session-startgit clone --depth 1 https://github.com/shakestzd/contextuneGrade 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- UserPromptSubmit — 86% identical, 26 lines differ
What it actually says
{
"SessionStart": [
{
"matcher": "*",
"hooks": [
{
"type": "command",
"command": "uv run ${CLAUDE_PLUGIN_ROOT}/hooks/session_start_git_context.py",
"timeout": 2000,
"description": "Git-powered context injection - differential updates since last session (~1-2K tokens)"
},
{
"type": "command",
"command": "node ${CLAUDE_PLUGIN_ROOT}/hooks/context_restorer.js",
"timeout": 2000,
"description": "Restore working context from scratch_pad.md (DRY context transfer)"
},
{
"type": "command",
"command": "node ${CLAUDE_PLUGIN_ROOT}/hooks/session_start.js",
"timeout": 1000,
"description": "Display Contextune commands (zero context overhead)"
},
{
"type": "command",
"command": "node ${CLAUDE_PLUGIN_ROOT}/hooks/version_checker.js",
"timeout": 3000,
"description": "Check for plugin updates (once per day)"
}
]
}
]
}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.
- 2d ago First seen · 33 lines scan A 2cdfde031932
SessionStart is a hook published in the GitHub repository shakestzd/contextune (5 stars, last pushed 8mo 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.
Other hooks, from other repositories
SubagentStop
Runs when a subagent finishes, executing cc10x_event_logger.py via python3. From romiluz13/cc10x.
PreCompact
Runs before the context is compacted, running python3. From memseekai/memseek.
UserPromptSubmit
Runs when you submit a prompt, before the agent sees it, running node. From cortadel/cortadel.
Stop
Runs when the agent finishes a response, executing stop.mjs via node. From SVerITG/Metis.
UserPromptSubmit
Runs when you submit a prompt, before the agent sees it, running an inline shell check. From hashgraph-online/hol-cigar.
PreCompact
Runs before the context is compacted, executing save-worktree-state.py via python3. From carmentacollective/carmenta.