civil3d-mcp-civil3d-mcp: Instructions file for Claude Code

CLAUDE.md

civil3d-mcp-civil3d-mcp CLAUDE.md is an instructions file for Claude Code from DaniGhosy/civil3d-mcp-civil3d-mcp. It costs 3,953 tokens per session, scanned A, original, MIT.

Repository instructions for a project that connects an AI assistant to Autodesk Civil 3D, a program for designing infrastructure and land-development drawings. The project uses a TypeScript server and a C# plugin inside Civil 3D.

In plain words
What is it for?
Use them when developing Civil 3D automation actions, routing requests between the server and plugin, and following the project's primitive-action design.
Why use it?
They explain the system boundaries and testing limits, so changes are made in the right part and are not mistaken for verified work in a real drawing.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is DaniGhosy/civil3d-mcp-civil3d-mcp's own configuration. It tells Claude Code how to work on civil3d-mcp-civil3d-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything civil3d-mcp-civil3d-mcp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to DaniGhosy/civil3d-mcp-civil3d-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/DaniGhosy/civil3d-mcp-civil3d-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/DaniGhosy/civil3d-mcp-civil3d-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for civil3d-mcp-civil3d-mcp CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/danighosy/civil3d-mcp-civil3d-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/danighosy/civil3d-mcp-civil3d-mcp/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/danighosy/civil3d-mcp-civil3d-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/danighosy/civil3d-mcp-civil3d-mcp/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for civil3d-mcp-civil3d-mcp CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/danighosy/civil3d-mcp-civil3d-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/danighosy/civil3d-mcp-civil3d-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 3,953 This file is loaded in full into every session.
When invoked 3,953 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.03953 $0.03953
Opus 5 $0.01976 $0.01976
Sonnet 5 $0.00791 $0.00791
Haiku 4.5 $0.00395 $0.00395

Measured 12d ago against content hash cfc8e0f23d3e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

civil3d-mcp-civil3d-mcp CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 213 lines

How it starts

The opening of the file, as written. The whole thing — 213 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Guía para trabajar en este repo. Complementa a README.md (setup, tabla de acciones) y a C_References/README.md (DLLs) — no los duplica.

Qué es esto

MCP de automatización para Autodesk Civil 3D. Dos procesos:

Asistente de IA ──stdio (MCP)── Servidor Node/TS ──TCP/JSON-RPC (8080)── Plugin C# dentro de Civil3D
  • Servidor MCP (src/, TypeScript/Node): expone tools MCP, valida input con Zod, reenvía cada acción al plugin como un método JSON-RPC.
  • Plugin C# (plugin/Civil3dMcpPlugin/, .NET 8.0-windows): corre dentro de Civil3D, recibe el JSON-RPC, ejecuta contra la API real de Civil3D/AutoCAD.

Esta sesión de Claude Code (desarrollo) no tiene las herramientas civil3d_* cargadas — esas solo existen en la sesión de asistente de IA que el usuario conecta contra el plugin ya corriendo dentro de Civil3D (C3DMCPSTART). Para probar un cambio contra un dibujo real, el usuario debe recompilar el plugin, recargarlo (NETLOAD) y probarlo desde esa otra sesión — no se puede verificar aquí más allá de que compile.

Filosofía: primitivas, no comandos de negocio

En vez de un comando monolítico por tarea, se construyen primitivas atómicas reutilizables (detectar, filtrar, leer propiedades, modificar, calcular) más comandos específicos por dominio. Esto permite componer tareas no anticipadas de antemano combinando primitivas en el momento, en vez de depender de que exista un comando exacto ya escrito. Las primitivas genéricas clave, todas en plugin/Civil3dMcpPlugin/GenericObjectCommands.cs (tool civil3d_object):

  • resolve_location — ubicar CUALQUIER punto por coordenadas, click interactivo del mouse, o relativo a un objeto de referencia + offset. Diseñado para componerse con comandos de creación existentes, no como un "crear cualquier cosa" monolítico.
  • get_properties / list_by_type — introspección genérica vía reflexión (GenericObjectCommands.SerializeSimpleProperties, reutilizado en ~8 dominios distintos).
  • set_style_name — motor de estilos universal: cualquier objeto con una propiedad StyleName escribible puede recibir un estilo por nombre; Civil3D resuelve el ObjectId internamente.
  • EnsureLayerId(db, tr, layerName, colorIndex?) — crea la capa si no existe, devuelve su ObjectId. Consolida 3 copias casi idénticas (inline en SurfaceCommands.cs, helper privado en ProfileCommands.cs, y la ausencia total del patrón en GeometryCommands.cs — causa raíz del bug de eKeyNotFound reportado en pruebas en vivo). También expuesta como ensure_layer. Usarla siempre que se vaya a asignar Entity.Layer a un nombre que podría no existir todavía.
  • delete_entity/move_entity/copy_entity/rotate_entity/get_entity_bounds/set_layer/ list_layers — primitivas genéricas sobre cualquier Entity por handle (post-Mes 9). Cierran el ciclo de prueba/limpieza: antes de esto no había forma de deshacer objetos de prueba sin entrar manualmente a Civil3D.

Read the full file on GitHub · 213 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 213 lines · 3,953 tokens per session scan A cfc8e0f23d3e

Subscribe to this mod's changes

civil3d-mcp-civil3d-mcp CLAUDE.md is an instructions file published in the GitHub repository DaniGhosy/civil3d-mcp-civil3d-mcp (2 stars, last pushed 24d ago), licensed MIT. It adds 3,953 tokens to every session, about $0.0198 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

Other instructions, from other repositories

spec-kit AGENTS.md

AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.

github/spec-kit · 7,126 tokens

next.js AGENTS.md

AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.

vercel/next.js · 7,296 tokens

codex AGENTS.md

AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.

openai/codex · 5,153 tokens

vscode buildNext.instructions.md

Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).

microsoft/vscode · 6,785 tokens

langchain AGENTS.md

AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.

langchain-ai/langchain · 4,469 tokens

vscode oss-third-party-notices.instructions.md

Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).

microsoft/vscode · 5,001 tokens