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/nizos/tdd-guard/session-startgit clone --depth 1 https://github.com/nizos/tdd-guardGrade 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 3d 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.
What it actually says
{
"SessionStart": [
{
"matcher": "startup|resume|clear",
"hooks": [
{
"type": "command",
"command": "npx tdd-guard@latest"
}
]
}
]
}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.
- 3d ago First seen · 13 lines scan A 0a418f599396
SessionStart is a hook published in the GitHub repository nizos/tdd-guard (2,324 stars, last pushed 17d 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 2026-08-30.
Other hooks, from other repositories
SessionStart
Runs when a session starts on startup, resume, clear and compact, executing session-start.cjs and hook-skill-suggest.cjs via node (2 commands). From PralhadYadawad/avvarre.
PreToolUse
Runs before the agent uses a tool for ^apply_patch$, ^write_to_file$, ^replace_file_content$ and ^multi_replace_file_content$ tool calls, executing impact-warn.cjs via node. From PralhadYadawad/avvarre.
Stop
Runs when the agent finishes a response, executing session-end.cjs via node. From PralhadYadawad/avvarre.
UserPromptSubmit
Runs when you submit a prompt, before the agent sees it, executing version-sync.sh and memory-prompt-hint.sh via bash (2 commands). From sdsrss/claudemd.
PreToolUse
Runs before the agent uses a tool for Edit, Write, NotebookEdit and Bash tool calls, executing protect_linter_configs.sh and enforce_package_managers.sh (2 commands). From alexfazio/plankton.
SessionStart
Runs when a session starts, executing session-start-check.sh via bash. From sdsrss/claudemd.