docs: split AGENTS.md into core policy and on-demand playbooks

2602.12670 and 2602.11988 findings favoring curated, minimal, modular guidance over comprehensive always-on context

docs/agent-playbooks/skills-and-tools.md

@@ -0,0 +1,50 @@
+# Skills and Tools
+
+Use this playbook when setting up/adjusting skills and external tooling.
+
+## Recommended Skills
+
+### Context7 (library docs)
+
+For up-to-date docs on libraries like `plebbit-react-hooks` and `plebbit-js`.
+
+```bash
+npx skills add https://github.com/intellectronica/agent-skills --skill context7
+```
+
+### Vercel React Best Practices
+
+For deeper React/Next performance guidance.
+
+```bash
+npx skills add https://github.com/vercel-labs/agent-skills --skill vercel-react-best-practices
+```
+
+### Find Skills
+
+Discover/install skills from the open ecosystem.
+
+```bash
+npx skills add https://github.com/vercel-labs/skills --skill find-skills
+```
+
+### Playwright CLI
+
+Use `playwright-cli` for browser automation (navigation, interaction, screenshots, tests, extraction).
+
+```bash
+npm install -g @playwright/cli@latest
+playwright-cli install --skills
+```
+
+Skill install locations:
+
+- `.cursor/skills/playwright-cli/`
+- `.claude/skills/playwright-cli/`
+
+## MCP Policy Rationale
+
+Avoid GitHub MCP and browser MCP servers for this project because they add significant tool-schema/context overhead.
+
+- GitHub operations: use `gh` CLI.
+- Browser operations: use `playwright-cli`.