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Agent skill

Hook Diagnostics

by hoangsonww in hoangsonww/Claude-Code-Agent-Monitor

Diagnose Claude Code hook installation, delivery, and ingestion issues.

MITAuto-check passedAgent Workflows

Install Hook Diagnostics

skills CLI
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill hook-diagnostics -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor hook-diagnostics --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/ccam-devtools/skills/hook-diagnostics .claude/skills/hook-diagnostics && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
hook-diagnostics
GitHub stars
1.1k
Used in
1 other repo
Token cost
~676 tokens
SKILL.md length
211 words
Files
2
Skills in repo
78
Repo updated
First seen
Licence
MIT

At a glance

Diagnose Claude Code hook installation, delivery, and ingestion issues.

  • Works in 6 steps: Hook Installation Check → Dashboard Connectivity → Hook Handler Validation → …
  • Events are not appearing in the dashboard
  • SKILL.md covers Input, Procedure and Output Format
  • Calls curl, jq and node

What it does

Hook Diagnostics is an agent skill from hoangsonww/Claude-Code-Agent-Monitor. Diagnose Claude Code hook installation, delivery, and ingestion issues. Checks hook configuration, connectivity, event flow, and identifies common problems. Use when events are not appearing in the dashboard.

Its SKILL.md is about 680 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).

It sits in Agent Workflows, covering Hooks and plugins. The repository describes itself as: 🚀 A real-time monitoring dashboard for Claude Code & Codex, built with SQLite3, Node.js, Express, React, Vite, TailwindCSS, & WebSockets. It tracks sessions, agent activity… The licence is MIT.

When your agent uses it

  • Events are not appearing in the dashboard
  • Tasks that involve Hooks and plugins

Example prompts

  • “/hook-diagnostics”

Workflow steps

6 steps, taken from the step headings in SKILL.md.

  1. Hook Installation Check
  2. Dashboard Connectivity
  3. Hook Handler Validation
  4. Event Delivery Test
  5. Database Check
  6. Recent Event Flow

What it can do on your machine

Read from SKILL.md and the folder at commit e0f4a1a. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • curl
    • jq
    • node

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use curl, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Hook Diagnostics loads about 676 tokens when it runs. Until then it costs about 56 tokens; SKILL.md has 211 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~56
When it runs · the whole SKILL.md, loaded when a task matches
~676

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from hoangsonww/Claude-Code-Agent-Monitor at commit e0f4a1a, republished under its MIT licence (© hoangsonww). 211 words, ~676 tokens.

Download SKILL.mdSave it as .claude/skills/hook-diagnostics/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
hook-diagnostics
description
Diagnose Claude Code hook installation, delivery, and ingestion issues. Checks hook configuration, connectivity, event flow, and identifies common problems. Use when events are not appearing in the dashboard.

Hook Diagnostics

Diagnose hook integration issues between Claude Code and the Agent Monitor.

Input

The user provides: $ARGUMENTS

This may be:

  • "full" or empty (default: run all diagnostics)
  • "install" to check hook installation only
  • "connectivity" to check dashboard connectivity only
  • "events" to check event delivery only

Procedure

Run diagnostic checks in this order:

1. Hook Installation Check

Verify hooks are installed in Claude Code settings:

bash
# Check if hooks exist in Claude Code settings
cat ~/.claude/settings.json | jq '.hooks // empty'

Verify:

  • All 7 expected hook types are registered: PreToolUse, PostToolUse, Stop, SubagentStop, Notification, SessionStart, SessionEnd
  • Hook commands point to the correct handler script path
  • Handler script exists and is readable at the configured path
2. Dashboard Connectivity

Test that the dashboard API is reachable:

bash
curl -sf http://localhost:4820/api/health

Verify:

  • Dashboard responds with 200 OK
  • Response includes expected health fields
  • WebSocket endpoint is accessible
3. Hook Handler Validation

Check the hook handler script:

bash
# Verify handler exists and is executable
ls -la <handler-path>
# Syntax check
node --check <handler-path>
4. Event Delivery Test

Send a test event and verify it arrives:

bash
echo '{"hook_type":"test","session_id":"diag-test","data":{}}' | \
  curl -sf -X POST http://localhost:4820/api/hooks/event \
  -H 'Content-Type: application/json' -d @-
5. Database Check

Verify the database is writable and events are persisted:

bash
curl -sf http://localhost:4820/api/stats
curl -sf http://localhost:4820/api/events?limit=5
6. Recent Event Flow

Check if events are flowing:

  • Time since last event received
  • Events received in last hour
  • Any gaps in event delivery

Output Format

Present as a diagnostic report with:

Hook Diagnostics Report
━━━━━━━━━━━━━━━━━━━━━━
✅ Hook Installation .............. PASS
✅ Dashboard Connectivity ......... PASS
✅ Handler Script ................. PASS
⚠️ Event Delivery ................ WARN (slow)
✅ Database ....................... PASS
❌ Recent Event Flow .............. FAIL (no events in 2h)
━━━━━━━━━━━━━━━━━━━━━━
Overall: 5/6 checks passed

For each failed or warning check, include:

  • What was expected vs what was found
  • Specific remediation steps
  • Commands to fix the issue

© hoangsonww, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in plugins/ccam-devtools/skills/hook-diagnostics of hoangsonww/Claude-Code-Agent-Monitor.

  • SKILL.md
  • agents/openai.yaml

Open the folder on GitHubat commit e0f4a1a

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in hoangsonww/Claude-Code-Agent-Monitor, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Hook Diagnostics next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Hook Diagnostics compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Hook Diagnostics this skillhoangsonww/Claude-Code-Agent-Monitor1.1k1 repos~676Automated safety check: PassMIT
Hook Development for Claude Code Pluginsanthropics/claude-plugins-official38k11 repos~4.1kAutomated safety check: NotesApache-2.0
Claude Code Agent Developmentanthropics/claude-plugins-official38k8 repos~2.8kAutomated safety check: PassApache-2.0
Claude Code Skill Developer Guidediet103/claude-code-infrastructure-showcase10k11 repos~3.5kAutomated safety check: PassMIT
Plugin Settings Patternanthropics/claude-plugins-official38k7 repos~3kAutomated safety check: PassApache-2.0
MCP Integration for Pluginsanthropics/claude-plugins-official38k11 repos~3.1kAutomated safety check: PassApache-2.0

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Categories

Questions about Hook Diagnostics

What does Hook Diagnostics do?

Diagnose Claude Code hook installation, delivery, and ingestion issues. Hook Diagnostics is an agent skill from hoangsonww/Claude-Code-Agent-Monitor. Diagnose Claude Code hook installation, delivery, and ingestion issues.

When should I use Hook Diagnostics?

Hook Diagnostics fits situations like: events are not appearing in the dashboard; tasks that involve Hooks and plugins.

How do I install Hook Diagnostics in Claude Code?

Run `npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill hook-diagnostics -a claude-code`. Or copy the skill folder (plugins/ccam-devtools/skills/hook-diagnostics in hoangsonww/Claude-Code-Agent-Monitor) into .claude/skills/hook-diagnostics in your project. Claude Code loads it when a task matches its description.

How do I install Hook Diagnostics in Codex?

Run `npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill hook-diagnostics -a codex`. Or copy the skill folder (plugins/ccam-devtools/skills/hook-diagnostics in hoangsonww/Claude-Code-Agent-Monitor) into .agents/skills/hook-diagnostics in your project. Codex loads it when a task matches its description.

Can I use Hook Diagnostics in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill hook-diagnostics -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/hook-diagnostics, .gemini/skills/hook-diagnostics, .github/skills/hook-diagnostics and .opencode/skills/hook-diagnostics in your project.

What does Hook Diagnostics need to run?

Going by SKILL.md and its folder, Hook Diagnostics needs the command-line tools its instructions call (curl, jq and node).

Does Hook Diagnostics access the network?

SKILL.md contains no URLs. Its commands use curl, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Hook Diagnostics safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Hook Diagnostics use?

Hook Diagnostics is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Hook Diagnostics use?

About 676 tokens (SKILL.md is roughly 2.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Hook Diagnostics?

Skills that share tags, products or a category with Hook Diagnostics: Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Claude Code Agent Development (anthropics/claude-plugins-official, 38k stars), Claude Code Skill Developer Guide (diet103/claude-code-infrastructure-showcase, 10k stars) and Plugin Settings Pattern (anthropics/claude-plugins-official, 38k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Hook Diagnostics?

hoangsonww (a GitHub user) maintains it in hoangsonww/Claude-Code-Agent-Monitor, which has 1,052 GitHub stars. The repository holds 78 skills in this directory. The repository was last updated on October 6, 2026.

Source: hoangsonww/Claude-Code-Agent-Monitor on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.