What is SubagentStop?

A stop-time hook that runs a shell check when a subagent finishes. It tries several Python or PowerShell commands to run the DOS workspace check.

Running the DOS stop check after subagents finish and reporting a warning when no check backend is available.

It lets the workspace check run automatically at the end of a subagent's work, without relying on a manual command.

SubagentStop — Hook by anthony-chaudhary

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/anthony-chaudhary/dos-kernel/subagent-stop

Clone the repo

git clone --depth 1 https://github.com/anthony-chaudhary/dos-kernel

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

SubagentStop 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.

claude-plugin/hooks/hooks.json · 14 lines

What it actually says

{
  "SubagentStop": [
    {
      "hooks": [
        {
          "type": "command",
          "shell": "bash",
          "command": "root=\"${CLAUDE_PLUGIN_ROOT:-${CODEX_PLUGIN_ROOT:-}}\"; if [ -n \"$root\" ] && [ -f \"$root/bin/dos-hook\" ]; then command -p sh \"$root/bin/dos-hook\" stop --workspace .; rc=$?; [ \"$rc\" -eq 0 ] && exit 0; fi; python -m dos.cli hook stop --workspace . 2>/dev/null || python3 -m dos.cli hook stop --workspace . 2>/dev/null || powershell.exe -NoProfile -ExecutionPolicy Bypass -Command 'python -m dos.cli hook stop --workspace .' 2>/dev/null || { [ -z \"$root\" ] || echo \"dos-hook: warning: no DOS hook backend could run; live DOS enforcement is fail-open. Install dos-kernel or restore claude-plugin/bin/dos-hook.\" >&2; true; }",
          "commandWindows": "& (Join-Path $env:PLUGIN_ROOT 'bin\\dos-hook-codex.ps1') stop --workspace . --dialect codex; exit $LASTEXITCODE"
        }
      ]
    }
  ]
}

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.

2d ago First seen · 14 lines scan A 058dd3f57ea8

Subscribe to this mod's changes

SubagentStop is a hook published in the GitHub repository anthony-chaudhary/dos-kernel (19 stars, last pushed 8d 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.

Backend and APIs Data and AI Languages Multi-Agent agent-orchestration cli developer-tools llm-agents mcp

SubagentStop

Getting it into your agent

Grade A, and why

Nothing flagged

What it actually says

What this file has done since we first saw it

Other hooks, from other repositories

Stop

SubagentStop

SessionStart

PostToolUse

PreToolUse

PostToolUse