Claude Code skills, ranked and checked

Verifies suspected security bugs one by one and gives a true or false positive verdict with evidence.

Makes the agent use the authenticated gh CLI for GitHub URLs, pull requests and issues instead of unauthenticated fetches.

Configures Python projects with uv, ruff and ty, including migration from pip, Poetry, mypy and black.

Configures mutation testing campaigns with mewt or muton and analyses the surviving mutants.

Writes, reviews and debugs property-based tests with Hypothesis, fast-check, proptest and similar tools.

Gets an independent code review of your changes from Codex or Antigravity.

Creates custom Semgrep rules that detect security vulnerabilities and bug patterns.

Identifies error-prone APIs, dangerous configurations and designs that invite security mistakes.

Checks code against its specification: which requirements hold, which are contradicted and which are missing.

Scans a codebase for security vulnerabilities with CodeQL's data flow and taint tracking analysis.

Parses, aggregates and deduplicates SARIF files from static analysis tools such as CodeQL and Semgrep.

Runs a Semgrep security scan: detects languages, selects rulesets, asks for approval, then runs the scans.

Audits a project's dependencies for supply-chain risk: advisories, abandoned upstreams and install-time scripts.

Designs and improves fuzzing harnesses for C, C++ and Rust targets.

Hunts for other instances of a bug that has already been found, across the whole codebase.

Guides the authoring of YARA-X detection rules for malware identification.

Detects missing zeroisation of sensitive data in C, C++ and Rust code, including cases removed by the compiler.

Guides the design of n8n AI agents and LLM chains built from the LangChain AI nodes.

Writes JavaScript for n8n Code nodes, covering $input, $json and $node syntax, HTTP helpers and date handling.

Writes native Python for n8n Code nodes and migrates older Pyodide-based code.

Wires error handling into n8n workflows so that failures are visible, structured and recoverable.

Validates n8n expression syntax and fixes common errors when mapping data between nodes.

Guides use of the n8n-mcp tools: searching nodes, validating configurations, using templates and managing workflows and credentials.

Guides node configuration in n8n: property dependencies, required fields and common patterns by node type.