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/provasign/prism/session-startgit clone --depth 1 https://github.com/provasign/prismGrade 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 yesterday.
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
2 near-identical copies found in the catalogue:
- Stop — 86% identical, 2 lines differ
- UserPromptSubmit — 84% identical, 2 lines differ
What it actually says
{
"SessionStart": [
{
"hooks": [
{
"command": "command -v shale >/dev/null 2>&1 && shale capture claude-code || true",
"type": "command"
}
]
}
]
}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.
- yesterday First seen · 12 lines scan A 5ab29649a2a0
SessionStart is a hook published in the GitHub repository provasign/prism (5 stars, last pushed yesterday), licensed Apache-2.0. 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
PostToolUse
Runs after a tool call finishes for Write and Edit tool calls, running an inline shell check. From KyaniteHQ/linctl.
PreToolUse
Runs before the agent uses a tool for Grep tool calls, running an inline shell check. From walkindude/gosymdb.
PostToolUse
Runs after a tool call finishes for Bash tool calls, executing tbd-closing-reminder.sh via bash. From jlevy/supply-chain-hardening.
SessionStart
Runs when a session starts, executing inject-instructions.mjs via node. From geml-spec/geml.
PreCompact
Runs before the context is compacted, running katra agent-hook snapshot --event pre-compact. From craigjmidwinter/katra.
PostToolUse
Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.