Delegate independent tasks to specialized agents working concurrently with isolated context.
Harness
harness
Automated quality check loops with escalation and fix sub-agents
SKILL.md
Full skill instructions
Harness
Automated fix loops. Each harness runs a make target, spawns sub-agents to fix failures, commits on success, reverts on exhaustion.
Pattern: .claude/harness/<name>/run + fix.prompt.md
Escalation: sonnet:think → opus:think → opus:ultrathink
History: Each harness maintains history.md for cross-attempt learning. Truncated per-file, accumulates across escalation. Agents append summaries after each attempt so higher-level models can avoid repeating failed approaches.
CLI: .claude/scripts/check-<name> symlinks to harness run scripts
Commands: /check-<name> runs the corresponding harness with --no-spinner
Quality: quality/run orchestrates all harnesses in sequence until stable
Running check-* Skills
When invoking check-* skills via Bash:
- Timeout: Use 60 minute timeout (
timeout: 3600000) - Foreground: Always run in foreground (never use
run_in_background) - Blocking: No output until completion—do not tail or monitor, just wait
- Output format: Structured JSON:
{"ok": true/false, "items": [...]}
More Other skills
brand-guidelines
Applies Anthropic's official brand colors and typography to any sort of artifact that may benefit from having Anthropic's look-and-feel. Use it when brand colors or style guidelines, visual formatting, or company design standards apply.
theme-factory
Toolkit for styling artifacts with a theme. These artifacts can be slides, docs, reportings, HTML landing pages, etc. There are 10 pre-set themes with colors/fonts that you can apply to any artifact that has been creating, or can generate a new theme on-the-fly.
internal-comms
A set of resources to help me write all kinds of internal communications, using the formats that my company likes to use. Claude should use this skill whenever asked to write some sort of internal communications (status reports, leadership updates, 3P updates, company newsletters, FAQs, incident reports, project updates, etc.).
Fundamental design principles for writing maintainable, testable Python code.
responsive-design
Modern responsive layouts using container queries, fluid typography, CSS Grid, and mobile-first strategies.
Generate Playwright tests from scenarios using interactive browser exploration and validation.
Automated website exploration and test case generation using Playwright.
Modern React state management with Redux Toolkit, Zustand, Jotai, and React Query for every state category.
gdpr-data-handling
GDPR-compliant data handling with consent management, data subject rights, and privacy controls.
Python error handling patterns including input validation, exception hierarchies, and partial failure handling. Use when implementing validation logic, designing exception strategies, handling batch processing failures, or building robust APIs.
refactor-plan
Detailed multi-file refactor planning with safety checks and rollback guidance.
