Claude Octopus is an orchestration project that sends research, design, and coding tasks to Claude Code and other AI model providers so their results can be compared. Developers use it for multi-model work, disagreement detection, reviews, persistent context, and an optional workflow that moves from discovery through delivery. The catalogue entries are its commands, skills, agents, instructions, hooks, plugins, and settings.
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 nyldn/claude-octopus/plugin install octoWrote 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/nyldn/claude-octopus/pre-compact)<a href="https://agentmods.dev/hooks/nyldn/claude-octopus/pre-compact"><img src="https://agentmods.dev/badge/hooks/nyldn/claude-octopus/pre-compact/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/hooks/nyldn/claude-octopus/pre-compact"><img src="https://agentmods.dev/badge/hooks/nyldn/claude-octopus/pre-compact.svg" alt="Reviewed on agentmods" width="80" height="20"></a>Grade A, and why
PreCompact 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 20d 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
8 near-identical copies found in the catalogue:
- PreCompact — 100% identical, 9 lines differ
- PreCompact — 100% identical, 9 lines differ
- PreCompact — 100% identical, 9 lines differ
- PreCompact — 100% identical, 9 lines differ
- PreCompact — 100% identical, 9 lines differ
- PreCompact — 100% identical, 9 lines differ
- PreCompact — 100% identical, 9 lines differ
- PreCompact — 100% identical, 9 lines differ
What it actually says
{
"PreCompact": [
{
"hooks": [
{
"type": "command",
"command": "${CLAUDE_PLUGIN_ROOT}/hooks/pre-compact.sh",
"commandWindows": "cmd /d /c exit 0",
"timeout": 10
}
]
}
]
}What else hooks.json configures
This page is one entry in a file that holds 18. Installing the file brings all of them; each is measured and scanned on its own page.
- Hook ConfigChange A not measured
- Hook CwdChanged A not measured
- Hook Elicitation A not measured
- Hook ElicitationResult A not measured
- Hook InstructionsLoaded A not measured
- Hook PermissionDenied A not measured
- Hook PostCompact A not measured
- Hook PostToolUse A not measured
- Hook PreToolUse A not measured
- Hook SessionEnd A not measured
- Hook SessionStart A not measured
- Hook StopFailure A not measured
- Hook SubagentStop A not measured
- Hook TaskCompleted A not measured
- Hook TaskCreated A not measured
- Hook TeammateIdle A not measured
- Hook UserPromptSubmit A not measured
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.
- 20d ago Changed · +1 lines 83a3a2f0c4d6
- 1mo ago Changed bd347d6ceb34
- 1mo ago First seen · 13 lines scan A 5cbb0be3852a
PreCompact is a hook published in the GitHub repository nyldn/claude-octopus (4,258 stars, last pushed today), 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
PreCompact
Runs before the context is compacted for manual and auto tool calls, executing compaction-state.sh via bash. From jikig-ai/soleur.
SessionStart
Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.
PostToolUse
Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.
PreToolUse
Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From apache/superset.
PreToolUse
Runs before the agent uses a tool, executing pre-write.sh and pre-bash.sh (2 commands). From anthropics/claude-cookbooks.
PostToolUse
Runs after a tool call finishes for Bash tool calls, executing hooks.sh via sh (3 commands). From anthropics/claude-plugins-official.