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 tellang/triflux/plugin install trifluxWrote 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/tellang/triflux/post-tool-use-failure)<a href="https://agentmods.dev/hooks/tellang/triflux/post-tool-use-failure"><img src="https://agentmods.dev/badge/hooks/tellang/triflux/post-tool-use-failure.svg" alt="Measured on agentmods" height="20"></a>Grade A, and why
PostToolUseFailure scanned grade A with 1 finding 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 8d 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.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
"command": "node -e \"const fs=require('node:fs'),os=require('node:os'),path=require('node:path'),cp=require('node:child_process');const roots=[];try{roots.push(fs.readFileSync(path.join(os.homedir(),'.claude','scripts', This is a copy
92% identical to SessionStart — 4 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
{
"PostToolUseFailure": [
{
"matcher": "*",
"hooks": [
{
"type": "command",
"command": "node -e \"const fs=require('node:fs'),os=require('node:os'),path=require('node:path'),cp=require('node:child_process');const roots=[];try{roots.push(fs.readFileSync(path.join(os.homedir(),'.claude','scripts','.tfx-pkg-root'),'utf8').trim())}catch{}roots.push(process.env.PLUGIN_ROOT,process.env.CLAUDE_PLUGIN_ROOT);try{roots.push(cp.execFileSync('git',['rev-parse','--show-toplevel'],{encoding:'utf8',stdio:['ignore','pipe','ignore']}).trim())}catch{}roots.push(process.cwd());const root=roots.find(r=>r&&fs.existsSync(path.join(r,'hooks','hook-orchestrator.mjs')));if(!root){console.error('[triflux hook] cannot locate hooks/hook-orchestrator.mjs');process.exit(1)}const child=cp.spawnSync(process.execPath,[path.join(root,'hooks','hook-orchestrator.mjs')],{stdio:'inherit',env:process.env,windowsHide:true});process.exit(child.status??(child.signal?1:0));\"",
"timeout": 5
}
]
}
]
}What else hooks.json configures
This page is one entry in a file that holds 12. Installing the file brings all of them; each is measured and scanned on its own page.
- Hook CwdChanged A not measured
- Hook PermissionRequest A not measured
- Hook PostToolUse A not measured
- Hook PreCompact A not measured
- Hook PreToolUse A not measured
- Hook SessionEnd A not measured
- Hook SessionStart A not measured
- Hook Stop A not measured
- Hook SubagentStart A not measured
- Hook SubagentStop 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.
- 8d ago First seen · 14 lines scan A e2a52445fb7d
PostToolUseFailure is a hook published in the GitHub repository tellang/triflux (7 stars, last pushed 5d 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 1 finding (runs shell commands). It is 92% identical to SessionStart, differing in 4 lines, and is treated as a copy.
Other hooks, from other repositories
Stop
Runs when the agent finishes a response, running trce spool --harness codex-cli --event Stop. From assimovt/trce-cli.
PostToolUse
Runs after a tool call finishes, running trce spool --harness codex-cli --event PostToolUse. From assimovt/trce-cli.
PostToolUse
Runs after a tool call finishes for Write and Edit tool calls, executing format_and_lint.sh. From supabase/supabase.
SessionStart
Runs when a session starts on startup, executing install_pkgs.sh. From supabase/supabase.
SessionStart
Runs when a session starts, executing on-start.js via node. From google-gemini/gemini-cli.
PreToolUse
Runs before the agent uses a tool for Bash tool calls, running an inline shell check. From apache/superset.