agent-creator

# Agent Creator Creates spec-compliant agent .md files following the Anthropic 2026 16-field schema. Supports both creation of new agents and validation of existing ones. ## Overview Agent Creator fills the gap between ad-hoc agent files and production-grade agents that pass marketplace validation. It enforces the Anthropic agent schema (14 valid fields), prevents common mistakes (using `allowed-tools` instead of `disallowedTools`, adding invalid fields like `capabilities` or `expertise_level`), and produces agents with substantive body content that actually guides Claude's behavior. Key difference from skill-creator: **agents support both `tools` (allowlist) AND `disallowedTools` (denylist)**, while skills only use `allowed-tools` (allowlist). Agents also support `effort`, `maxTurns`, `skills`, `memory`, `isolation`, `permissionMode`, `background`, `color`, and `initialPrompt` — fields that don't exist for skills. The agent body becomes the **system prompt** that drives the subagent — it does NOT receive the full Claude Code system prompt. ## Prerequisites - Claude Code CLI with agent support - Target directory writable (`agents/` within a plugin or `~/.claude/agents/` for standalone) - Familiarity with what the agent should specialize in ## Instructions ### Mode Detection Determine user intent from their prompt: - **Create mode**: "create an agent", "build a subagent", "new agent" -> Step 1 - **Validate mode**: "validate agent", "check agent", "grade agent" -> Vali...