5 Portable Agent Skills for OpenCode and Claude Code

Agent Skills turn repeated prompts into reusable, inspectable workflows. This collection includes five small skills for work that comes up often when building with OpenCode or Claude Code: reviewing public copy, checking text limits, capturing public webpages as PDFs, sending task notifications, and structuring research for later use. The full index is available at Published Agent Skills . For OpenCode, Skills can live in ~/.config/opencode/skills/ or project-level locations supported by your setup. Claude Code can discover Skills from .claude/skills/ . Put a Skill folder in the right location, restart the agent session if needed, and it becomes available when the task matches its description. 1. AI Writing Detector Skill AI Writing Detector Skill reviews English and Brazilian Portuguese copy for patterns that make AI-written text feel generic. It checks common issues such as repeated sentence rhythm, filler phrases, excessive formatting, and em-dash use. It also ships with a CLI and MCP server for text and file linting. Useful prompts: Review this README introduction with the anti-ai-tells Skill. Keep the technical facts, flag generic wording, and suggest direct replacements. Run the writing linter on this release post, then rewrite only the passages that need attention. This is useful before publishing documentation, launch posts, landing pages, and changelogs. 2. Text Counter Skill Text Counter Skill gives exact counts for characters, words, sentences, paragraphs, lines, graphemes, bytes, and phrase occurrences. It helps when "roughly under the limit" is not enough. Useful prompts: Write a 155-character meta description for this package and verify its exact character count. Reduce this GitHub issue title to 80 characters without removing the error code. Count the phrase "OpenCode" in this Markdown file. The Skill makes counting rules explicit. That avoids surprises with spaces, Unicode characters, emoji, or repeated phrases. 3. HTML to PDF Skill HTML to PDF Skill