# Function Model Construction

> Build substance-field functional model of a system, annotating useful, harmful, insufficient, and excessive interactions.

- Skill: `yogsoth-ai/function-model-construction` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add yogsoth-ai/function-model-construction`
- Raw SKILL.md: https://api.skillmd.com/api/skills/yogsoth-ai/function-model-construction/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: yogsoth-ai (https://skillmd.com/u/yogsoth-ai)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/yogsoth-ai/function-model-construction

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# Function Model Construction

Build a substance-field functional model for system analysis.

## Execution

Subagent — spawned via subagent-spawning/spawn-agent skill.

## Why Subagent

Functional modeling requires careful identification of all system components and their interactions, classifying each interaction type. Benefits from dedicated analytical context without distraction from downstream operations.

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## Available SOPs

Optional, no fixed order; the final leaf is always a sop.

| SOP | When to use |
| --- | --- |
| spawn-agent | Spawn a customized CC subagent with full MCP tool access. Used by SOPs that declare execution: subagent. |

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