idfkit

idfkit plugin

The agentic plugin for idfkit — EnergyPlus building energy modeling for AI coding assistants. It bundles everything an agent needs to create, validate, simulate, and reason about building energy models, and installs across Claude Code, Cursor, Copilot, Gemini, Codex, and any MCP-capable client.

What's in the box

Layer	What it does
MCP server (uvx idfkit-mcp)	Tools and idfkit://… resources to load, query, edit, validate, and simulate IDF / epJSON models.
developing-with-idfkit skill	Discovers the idfkit installed in your project and loads version-matched reference docs for writing Python against the library.
Workflow skills	Task playbooks that orchestrate the MCP tools: simulate, validate, new-model, load-model, energy-audit, weather, upgrade-version, idf-conventions, docs.
Agents	Focused sub-agents: energy-modeler, envelope-analyst, hvac-designer.
Commands & hooks	/quick-sim slash command; context hooks that nudge agents toward the structured MCP tools when they touch .idf / .epJSON / .epw / .ddy files.
LSP	Python LSP for idfkit-based code (idfkit-lsp) via .lsp.json.

Note on the LSP. idfkit-lsp is a language server for Python code that imports idfkit — it does not provide an IDF/epJSON language server. Because it registers .py → python, the host attaches it to every Python file in the project, where it coexists with (and may compete with) your primary Python LSP such as Pylance, pyright, or ruff-lsp. If your editor supports scoping a server by workspace or activation pattern, narrow it to idfkit projects.

Two contexts, two surfaces

The plugin deliberately separates two kinds of work:

• Writing Python code with idfkit (import idfkit) → the developing-with-idfkit skill. It resolves the idfkit installed in your project and loads the reference set that matches that exact version, so guidance never drifts from the API your code runs against. This works without the MCP server — it's pure library authoring.
• Interacting with an IDF model through the assistant → the MCP server plus the workflow skills. Here the agent calls tools (load_model, run_simulation, …) rather than writing idfkit code.

The reference documentation lives inside the idfkit pip package (>=0.13, at idfkit/.agents/skills/developing-with-idfkit/), not in this repo. The skill just discovers and routes to it — install once, and every project automatically gets the docs matched to its pinned idfkit version.

Installation

Claude Code — full plugin (recommended)

Installs the MCP server, skills, agents, commands, and hooks together:

/plugin marketplace add idfkit/idfkit-plugin
/plugin install idfkit@idfkit

Cross-agent skills — npx skills

skills is a cross-agent installer (Claude Code, Cursor, Copilot, Gemini CLI, Codex, …). Install the package-authoring skill at the user level so it works across every project:

npx skills add idfkit/idfkit-plugin -s developing-with-idfkit -g

-s picks a specific skill; -g installs globally (drop it to install into the current project's .<agent>/skills/). Omit -s to add the workflow skills too — those pair with the MCP server below.

GitHub Copilot

gh skill install idfkit/idfkit-plugin developing-with-idfkit --scope user

Cursor

gh skill install idfkit/idfkit-plugin developing-with-idfkit --agent cursor --scope user

Gemini CLI

gemini skills install https://github.com/idfkit/idfkit-plugin.git

OpenAI Codex

From inside a Codex session, run $skill-installer and point it at idfkit/idfkit-plugin. The repo also ships a .codex-plugin/ manifest.

MCP server — any MCP-capable client

For Claude Desktop, ChatGPT, or other MCP clients, add the server directly:

{
  "mcpServers": {
    "idfkit": { "command": "uvx", "args": ["idfkit-mcp"] }
  }
}

Requirements

• Python 3.10+ with idfkit >= 0.13 installed in your project — required for the developing-with-idfkit skill to find version-matched references. Older idfkit falls back to docs.idfkit.com.
• uv (uvx) to run the idfkit-mcp server.
• EnergyPlus installed on the host to run simulations (idfkit discovers it via $ENERGYPLUS_DIR, $PATH, or standard install locations).

How discovery works

The developing-with-idfkit skill runs scripts/discover.py, which: