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Agent skill

Implementing Web Application Logging With Modsecurity

by mukul975 in mukul975/Anthropic-Cybersecurity-Skills

Configure ModSecurity WAF with the OWASP Core Rule Set (CRS) for web application audit logging, tuning SecRuleEngine, SecAuditEngine, and CRS paranoia levels to reduce false positives, and writing…

Apache-2.0Auto-check passedSecurity

Install Implementing Web Application Logging With Modsecurity

skills CLI
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-web-application-logging-with-modsecurity -a claude-code

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

GitHub CLI
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills implementing-web-application-logging-with-modsecurity --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/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/implementing-web-application-logging-with-modsecurity .claude/skills/implementing-web-application-logging-with-modsecurity && 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
implementing-web-application-logging-with-modsecurity
GitHub stars
34k
Token cost
~615 tokens
SKILL.md length
183 words
Files
4 (incl. scripts, references)
Skills in repo
637
Repo updated
First seen
Licence
Apache-2.0

At a glance

Configure ModSecurity WAF with the OWASP Core Rule Set (CRS) for web application audit logging, tuning SecRuleEngine, SecAuditEngine, and CRS paranoia levels to reduce false positives, and writing…

  • Works in 6 steps: Install ModSecurity and configure… → Deploy OWASP CRS v4 and set paranoia… → Configure SecAuditEngine for… → …
  • Tuning a ModSecurity WAF
  • SKILL.md covers Overview, When to Use, Prerequisites and Steps, plus 1 more section
  • Runs Python scripts from its folder

What it does

Implementing Web Application Logging With Modsecurity is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Configure ModSecurity WAF with the OWASP Core Rule Set (CRS) for web application audit logging, tuning SecRuleEngine, SecAuditEngine, and CRS paranoia levels to reduce false positives, and writing custom SecRules for application-specific threats. Use when deploying or tuning a ModSecurity WAF, analyzing audit logs for attack detection, or reducing CRS false positives.

Its SKILL.md is about 620 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including scripts and reference files (for example `references/api-reference.md` and `scripts/agent.py`).

It sits in Security, covering Web application vulnerabilities. The repository describes itself as: 817 structured cybersecurity skills for AI agents · Mapped to 6 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF & MITRE F3 (Fight Fraud) · agentskills.io…. The licence is Apache-2.0.

When your agent uses it

  • Tuning a ModSecurity WAF
  • Analyzing audit logs for attack detection
  • Reducing CRS false positives

Example prompts

  • “/implementing-web-application-logging-with-modsecurity”

Requirements

  • Python 3

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Install ModSecurity and configure SecRuleEngine in DetectionOnly mode
  2. Deploy OWASP CRS v4 and set paranoia level (PL1-PL4)
  3. Configure SecAuditEngine for relevant-only logging
  4. Tune false positives with SecRuleRemoveById and rule exclusions
  5. Switch to blocking mode (SecRuleEngine On) after tuning period
  6. Forward audit logs to SIEM for correlation and alerting

What it can do on your machine

Read from SKILL.md and the folder at commit 54a7988. 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

    Ships 1 file in scripts/ (Python), which the agent can run.

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

  • Network

    No URLs in SKILL.md.

    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

Implementing Web Application Logging With Modsecurity loads about 615 tokens when it runs, and up to ~1.1k if it reads all its reference files. Until then it costs about 106 tokens; SKILL.md has 183 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~106
When it runs · the whole SKILL.md, loaded when a task matches
~615
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.1k

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); the scripts in this folder are not scanned.

SKILL.md

The full file from mukul975/Anthropic-Cybersecurity-Skills at commit 54a7988, republished under its Apache-2.0 licence (© mukul975). 183 words, ~615 tokens.

Download SKILL.mdSave it as .claude/skills/implementing-web-application-logging-with-modsecurity/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
implementing-web-application-logging-with-modsecurity
description
Configure ModSecurity WAF with the OWASP Core Rule Set (CRS) for web application audit logging, tuning SecRuleEngine, SecAuditEngine, and CRS paranoia levels to reduce false positives, and writing custom SecRules for application-specific threats. Use when deploying or tuning a ModSecurity WAF, analyzing audit logs for attack detection, or reducing CRS false positives.
domain
cybersecurity
subdomain
web-application-security
tags
modsecurity, waf, crs, owasp, web-security, audit-logging, rule-tuning
version
1.0
author
mahipal
license
Apache-2.0
nist_ai_rmf
MEASURE-2.7, MAP-5.1, MANAGE-2.4
atlas_techniques
AML.T0070, AML.T0066, AML.T0082
nist_csf
PR.PS-01, ID.RA-01, PR.DS-10, DE.CM-01
mitre_attack
T1190, T1059.007, T1505.003, T1083

Implementing Web Application Logging with ModSecurity

Overview

ModSecurity is an open-source WAF engine that works with Apache, Nginx, and IIS. The OWASP Core Rule Set (CRS) provides generic attack detection rules covering SQL injection, XSS, RCE, LFI, and other OWASP Top 10 attacks. ModSecurity logs full request/response data in audit logs for forensic analysis and generates alerts that feed into SIEM platforms.

When to Use

  • When deploying or configuring implementing web application logging with modsecurity capabilities in your environment
  • When establishing security controls aligned to compliance requirements
  • When building or improving security architecture for this domain
  • When conducting security assessments that require this implementation

Prerequisites

  • Web server (Apache 2.4+ or Nginx) with ModSecurity v3 module
  • OWASP CRS v4.x installed
  • Log aggregation infrastructure (ELK, Splunk, or Wazuh)

Steps

  1. Install ModSecurity and configure SecRuleEngine in DetectionOnly mode
  2. Deploy OWASP CRS v4 and set paranoia level (PL1-PL4)
  3. Configure SecAuditEngine for relevant-only logging
  4. Tune false positives with SecRuleRemoveById and rule exclusions
  5. Switch to blocking mode (SecRuleEngine On) after tuning period
  6. Forward audit logs to SIEM for correlation and alerting

Expected Output

ModSecurity: Warning. Pattern match "(?:union\s+select)" [file "/etc/modsecurity/crs/rules/REQUEST-942-APPLICATION-ATTACK-SQLI.conf"] [line "45"] [id "942100"] [msg "SQL Injection Attack Detected via libinjection"] [severity "CRITICAL"]

© mukul975, Apache-2.0. 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 3 other files (scripts, references) in skills/implementing-web-application-logging-with-modsecurity of mukul975/Anthropic-Cybersecurity-Skills.

  • SKILL.md
  • LICENSE
  • references/api-reference.md
  • scripts/agent.py

Open the folder on GitHubat commit 54a7988

Compare with similar skills

Implementing Web Application Logging With Modsecurity 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.

Implementing Web Application Logging With Modsecurity compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Implementing Web Application Logging With Modsecurity this skillmukul975/Anthropic-Cybersecurity-Skills34k—~615Automated safety check: PassApache-2.0
Security And Hardeningpenpot/penpot61k6 repos~4.7kAutomated safety check: NotesMPL-2.0
Security Auditoreigent-ai/eigent15k—~1.8kAutomated safety check: NotesApache-2.0
Security Reviewjewbetcha/opentrace11618 repos~3.1kAutomated safety check: NotesMIT
Strix Code Vulnerability Scanusestrix/strix67k—~1.1kAutomated safety check: PassApache-2.0
Code Audit3stoneBrother/code-audit8931 repos~2.7kAutomated safety check: PassNone

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Categories

Questions about Implementing Web Application Logging With Modsecurity

What does Implementing Web Application Logging With Modsecurity do?

Configure ModSecurity WAF with the OWASP Core Rule Set (CRS) for web application audit logging, tuning SecRuleEngine, SecAuditEngine, and CRS paranoia levels to reduce false positives, and writing…. Implementing Web Application Logging With Modsecurity is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Configure ModSecurity WAF with the OWASP Core Rule Set (CRS) for web application audit logging, tuning SecRuleEngine, SecAuditEngine, and CRS paranoia levels to reduce false positives, and writing custom SecRules for application-specific threats.

When should I use Implementing Web Application Logging With Modsecurity?

Implementing Web Application Logging With Modsecurity fits situations like: tuning a ModSecurity WAF; analyzing audit logs for attack detection; reducing CRS false positives.

How do I install Implementing Web Application Logging With Modsecurity in Claude Code?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-web-application-logging-with-modsecurity -a claude-code`. Or copy the skill folder (skills/implementing-web-application-logging-with-modsecurity in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/implementing-web-application-logging-with-modsecurity in your project. Claude Code loads it when a task matches its description.

How do I install Implementing Web Application Logging With Modsecurity in Codex?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-web-application-logging-with-modsecurity -a codex`. Or copy the skill folder (skills/implementing-web-application-logging-with-modsecurity in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/implementing-web-application-logging-with-modsecurity in your project. Codex loads it when a task matches its description.

Can I use Implementing Web Application Logging With Modsecurity 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 mukul975/Anthropic-Cybersecurity-Skills --skill implementing-web-application-logging-with-modsecurity -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/implementing-web-application-logging-with-modsecurity, .gemini/skills/implementing-web-application-logging-with-modsecurity, .github/skills/implementing-web-application-logging-with-modsecurity and .opencode/skills/implementing-web-application-logging-with-modsecurity in your project.

What does Implementing Web Application Logging With Modsecurity need to run?

Going by SKILL.md and its folder, Implementing Web Application Logging With Modsecurity needs Python for the scripts in its folder. Our summary lists: Python 3.

Does Implementing Web Application Logging With Modsecurity access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Implementing Web Application Logging With Modsecurity 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Implementing Web Application Logging With Modsecurity use?

Implementing Web Application Logging With Modsecurity is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Implementing Web Application Logging With Modsecurity use?

About 615 tokens (SKILL.md is roughly 2.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 534 tokens, read only when the agent opens those files.

What are the alternatives to Implementing Web Application Logging With Modsecurity?

Skills that share tags, products or a category with Implementing Web Application Logging With Modsecurity: Security And Hardening (penpot/penpot, 61k stars), Security Auditor (eigent-ai/eigent, 15k stars), Security Review (jewbetcha/opentrace, 116 stars) and Strix Code Vulnerability Scan (usestrix/strix, 67k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Implementing Web Application Logging With Modsecurity?

mukul975 (a GitHub user) maintains it in mukul975/Anthropic-Cybersecurity-Skills, which has 33,922 GitHub stars. The repository holds 637 skills in this directory. The repository was last updated on August 31, 2026.

Source: mukul975/Anthropic-Cybersecurity-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.