Scan
wshobson/agents
Scans the codebase to generate project-doc.md and AGENTS.md.
Scan recent Claude Code activity for errors and failure signals across all sessions using Agent Monitor data — APIError events and PreToolUse→PostToolUse gaps (tools that started but never…
MITAuto-check passed
Install Error Scan
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill error-scan -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor error-scan --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ 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-quality/skills/error-scan .claude/skills/error-scan && rm -rf skills-srcUse ~/.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/
Install the "error-scan" agent skill from https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-quality/skills/error-scan into .claude/skills/error-scan/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "error-scan", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-quality/skills/error-scanType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill error-scan -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor error-scan --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/ccam-quality/skills/error-scan .agents/skills/error-scan && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "error-scan" agent skill from https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-quality/skills/error-scan into .agents/skills/error-scan/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "error-scan", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill error-scan -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor error-scan --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/ccam-quality/skills/error-scan .cursor/skills/error-scan && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "error-scan" agent skill from https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-quality/skills/error-scan into .cursor/skills/error-scan/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "error-scan", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git --path plugins/ccam-quality/skills/error-scan--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill error-scan -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor error-scan --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/ccam-quality/skills/error-scan .gemini/skills/error-scan && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "error-scan" agent skill from https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-quality/skills/error-scan into .gemini/skills/error-scan/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "error-scan", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor error-scanInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill error-scan -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/ccam-quality/skills/error-scan .github/skills/error-scan && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "error-scan" agent skill from https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-quality/skills/error-scan into .github/skills/error-scan/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "error-scan", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill error-scan -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install hoangsonww/Claude-Code-Agent-Monitor error-scan --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/hoangsonww/Claude-Code-Agent-Monitor.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/ccam-quality/skills/error-scan .opencode/skills/error-scan && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "error-scan" agent skill from https://github.com/hoangsonww/Claude-Code-Agent-Monitor/tree/master/plugins/ccam-quality/skills/error-scan into .opencode/skills/error-scan/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "error-scan", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
error-scan- GitHub stars
- 1.1k
- Token cost
- ~756 tokens
- SKILL.md length
- 353 words
- Files
- 2
- Skills in repo
- 78
- Repo updated
- First seen
- Licence
- MIT
At a glance
Scan recent Claude Code activity for errors and failure signals across all sessions using Agent Monitor data — APIError events and PreToolUse→PostToolUse gaps (tools that started but never…
- Works in 5 steps: Scope → Fleet Failure Counts → Group by Tool → …
- Checking for errors
- SKILL.md covers Input, Data Sources, Report Sections and Output
- Calls npm
What it does
Error Scan is an agent skill from hoangsonww/Claude-Code-Agent-Monitor. Scan recent Claude Code activity for errors and failure signals across all sessions using Agent Monitor data — APIError events and PreToolUse→PostToolUse gaps (tools that started but never completed) — then group failures by tool and model and rank them by frequency. Use when checking for errors or asking "what's failing right now".
Its SKILL.md is about 760 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).
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
- Checking for errors
- Asking whats failing right now
Example prompts
- “s failing right now”
- “/error-scan”
Workflow steps
5 steps, taken from the step headings in SKILL.md.
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:
npm
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use npm, 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
Error Scan loads about 756 tokens when it runs. Until then it costs about 86 tokens; SKILL.md has 353 words of instructions outside code blocks.
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). 353 words, ~756 tokens.
Download SKILL.mdSave it as
.claude/skills/error-scan/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- error-scan
- description
- Scan recent Claude Code activity for errors and failure signals across all sessions using Agent Monitor data — APIError events and PreToolUse→PostToolUse gaps (tools that started but never completed) — then group failures by tool and model and rank them by frequency. Use when checking for errors or asking "what's failing right now".
Error Scan
Sweep recent events across sessions for error and failure signals, then rank them by how often they occur and which tool or model produced them.
Input
The user provides: $ARGUMENTS
This may be:
- empty or "all" — scan every failure signal (default)
- "api" — APIError events only
- "tools" — tool-failure gaps only
- a number N — limit the scan to the most recent N sessions
- a session ID — scan a single session
Data Sources
| Endpoint | Returns |
|---|---|
GET /api/analytics | event_types (counts per type incl. PreToolUse, PostToolUse, APIError), tool_usage (top 20), daily_events (365d) — fleet-wide failure baseline |
GET /api/events?session_id=X | Per-session event stream: event_type, tool_name, summary, data, timestamp — locate APIError and unmatched PreToolUse |
GET /api/sessions?limit=N | Sessions with id, status, model, started_at — pick the recent window and attribute failures to a model |
Report Sections
1. Scope
Resolve $ARGUMENTS to a session set: pull GET /api/sessions?limit=N (default 50, ordered by started_at). Report how many sessions and what time span are covered.
2. Fleet Failure Counts
From GET /api/analytics event_types, report total APIError count and the PreToolUse→PostToolUse gap: gap = PreToolUse − PostToolUse (unmatched tool starts = likely failures). State both as raw counts and as a share of total_events.
3. Group by Tool
For each session in scope, pull GET /api/events?session_id=X. Match each PreToolUse to its following PostToolUse by tool_name; unmatched starts are failures. Aggregate failures and APIError events per tool_name. Rank tools by failure frequency (descending).
Show full SKILL.md (127 more words)Show less
4. Group by Model
Join failures to the owning session's model (from GET /api/sessions). Rank models by APIError count and tool-failure count.
5. Top Offenders
List the single most failure-prone tool, the most error-prone model, and the session with the most failures, each with its exact count and one-line summary excerpt from a representative event.
Output
- A ranked Markdown table: tool/model | APIError count | tool-failure (gap) count | total failures | share of events.
- Rates as percentages to 2 decimals.
- Cite exact
event_type,tool_name, andsession_idvalues — never fabricate counts. - End with the one failure pattern most worth investigating and a concrete next step.
- Read-only: only report what the API returns. If
curlcannot reachhttp://localhost:4820, tell the user to start the dashboard withnpm startfrom the repo root.
© 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-quality/skills/error-scan of hoangsonww/Claude-Code-Agent-Monitor.
- SKILL.md
- agents/openai.yaml
Open the folder on GitHubat commit e0f4a1a
Compare with similar skills
Error Scan 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Error Scan this skillhoangsonww/Claude-Code-Agent-Monitor | 1.1k | — | ~756 | Automated safety check: Pass | MIT | |
| Scanwshobson/agents | 40k | — | ~2.2k | Automated safety check: Pass | MIT | |
| SignalsPostHog/posthog | 40k | — | ~4.3k | Automated safety check: Pass | Custom licence | |
| Repo Scanaffaan-m/ECC | 275k | — | ~1.5k | Automated safety check: Pass | MIT | |
| Repo Scanaffaan-m/ECC | 275k | — | ~1.3k | Automated safety check: Pass | MIT | |
| Quality Scandiegosouzapw/OmniRoute | 74k | — | ~748 | Automated safety check: Pass | MIT |
Similar skills
- Official
Signals
PostHog/posthog
How to query the documentembeddings table for raw signal data using HogQL.
Repo Scan
affaan-m/ECC
固定されレビュー可能なコミットから外部の repo-scan スキルをインストールするブートストラップ用ポインター。クロススタックのソースコード資産監査を実行する前に repo-scan のインストールが必要な場合に使用する。この ECC ポインター自体は監査を実行しない。
Repo Scan
affaan-m/ECC
用于从固定且可审查的提交安装外部 repo-scan 技能的引导指针。在运行跨栈源代码资产审计前需要安装 repo-scan 时使用；此 ECC 指针本身不执行审计。
Quality Scan
diegosouzapw/OmniRoute
Runs a scoped, read-only quality scan on a repository candidate and reports exact evidence, failures and frozen debt, without treating a static scan as release acceptance.
Vulnerability Scanning
sickn33/agentic-awesome-skills
Scan systems and dependencies for CVEs and security vulnerabilities.
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Questions about Error Scan
What does Error Scan do?
Scan recent Claude Code activity for errors and failure signals across all sessions using Agent Monitor data — APIError events and PreToolUse→PostToolUse gaps (tools that started but never…. Error Scan is an agent skill from hoangsonww/Claude-Code-Agent-Monitor. Scan recent Claude Code activity for errors and failure signals across all sessions using Agent Monitor data — APIError events and PreToolUse→PostToolUse gaps (tools that started but never completed) — then group failures by tool and model and rank them by frequency.
When should I use Error Scan?
Error Scan fits situations like: checking for errors; asking whats failing right now.
How do I install Error Scan in Claude Code?
Run `npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill error-scan -a claude-code`. Or copy the skill folder (plugins/ccam-quality/skills/error-scan in hoangsonww/Claude-Code-Agent-Monitor) into .claude/skills/error-scan in your project. Claude Code loads it when a task matches its description.
How do I install Error Scan in Codex?
Run `npx skills add hoangsonww/Claude-Code-Agent-Monitor --skill error-scan -a codex`. Or copy the skill folder (plugins/ccam-quality/skills/error-scan in hoangsonww/Claude-Code-Agent-Monitor) into .agents/skills/error-scan in your project. Codex loads it when a task matches its description.
Can I use Error Scan 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 error-scan -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/error-scan, .gemini/skills/error-scan, .github/skills/error-scan and .opencode/skills/error-scan in your project.
What does Error Scan need to run?
Going by SKILL.md and its folder, Error Scan needs the command-line tools its instructions call (npm).
Does Error Scan access the network?
SKILL.md contains no URLs. Its commands use npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Error Scan 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 Error Scan use?
Error Scan 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 Error Scan use?
About 756 tokens (SKILL.md is roughly 3k 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 Error Scan?
Skills that share tags, products or a category with Error Scan: Scan (wshobson/agents, 40k stars), Signals (PostHog/posthog, 40k stars), Repo Scan (affaan-m/ECC, 275k stars) and Repo Scan (affaan-m/ECC, 275k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Error Scan?
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.