agentium-tool-authoring

name	agentium-tool-authoring
description	Author external Agentium tools — tool-manifest.json, JSON-RPC handlers, FSM transitions. Use when scaffolding host tools outside the monorepo.

Agentium tool authoring

When to apply

• Creating external tools (tool-manifest.json, handler source)
• Enabling tools on a running instance
• Referencing tools from agent manifests

Workflow

1. agentium new tool <name>
2. agentium skill install tool (this skill)
3. Implement handlers; agentium check tool <dir>
4. agentium install tool <dir> — enables on runner registry
5. Add exact tool name to agent manifest.json → agentium install agent

Hard rules

• tool-manifest.json name must match agent manifest allowlist exactly
• Session tools follow Open → Send → SearchRead → Finish/Abort FSM
• Return structured JSON at tool boundaries

Commands

Command	Purpose
agentium install tool <dir>	Enable external tool on runner
agentium check tool <dir>	Validate manifest locally