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). Skills use allowed-tools (allowlist) and, since schema 3.7.0, an optional kebab-case disallowed-tools denylist — a parallel field, not a unification. 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.