agent-builder
Creates Claude Code agent files (.claude/agents/*.md) with YAML frontmatter, tool permissions, and system prompts. Use when building new agents, configuring agent frontmatter, writing agent system prompts, or setting agent tool permissions.
npx skills add majiayu000/claude-skill-registry --skill agent-builder-bsamiee-parametric-portal --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# [H1][AGENT-BUILDER] >**Dictum:** *Structured frontmatter and scoped tools enable discoverable agents.* <br> Specialized execution contexts for Claude Code subagent delegation. Frontmatter controls discovery and capabilities; markdown body encodes behavior. **Location:** `.claude/agents/` (project) or `~/.claude/agents/` (user). Higher priority wins: CLI flag > project > user > plugin. **Tasks:** 1. Read [index.md](./index.md) — Reference file listing for navigation. 2. Read [frontmatter.md](./references/frontmatter.md) — Complete schema (11 fields), triggers, syntax. 3. Read [prompt.md](./references/prompt.md) — Structure patterns, constraint markers. 4. Read [workflow.md](./references/workflow.md) — 5-phase creation process. 5. (prose) Load `style-standards` skill — Voice, formatting, constraints. 6. Execute per workflow — UNDERSTAND, ACQUIRE, RESEARCH, AUTHOR, VALIDATE. 7. Validate — Quality gate; see §VALIDATION. **Templates:** [→agent.template.md](./templates/agent.template.md) — Standard agent scaffold. [REFERENCE]: [index.md](./index.md) — Complete reference file listing. --- ## [1][FRONTMATTER] >**Dictum:** *Metadata enables discovery before load.* <br> ```yaml --- name: a
- [1][FRONTMATTER]
- [2][DISCOVERY]
- [3][TOOLS]
- [4][MODELS]
- [5][SYSTEMPROMPT]
- [6][NAMING]
- [7][VALIDATION]
What does the agent-builder skill do?
Creates Claude Code agent files (.claude/agents/*.md) with YAML frontmatter, tool permissions, and system prompts. Use when building new agents, configuring agent frontmatter, writing agent system prompts, or setting agent tool permissions.
How do I install it?
Run `npx skills add majiayu000/claude-skill-registry --skill agent-builder-bsamiee-parametric-portal --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From majiayu000/claude-skill-registry, a repository with 534 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.