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OSCAR_Public: Instructions file for Claude Code

CLAUDE.md

OSCAR_Public CLAUDE.md is an instructions file for Claude Code from Creative-Inertia/OSCAR_Public. It costs 1,417 tokens per session, scanned A, original, Apache-2.0.

A project instruction file for OSCAR, a package for building a secure local MCP server that lets Claude Code control Autodesk Fusion 360, a computer-aided-design application.

In plain words
What is it for?
It guides work involving the Fusion 360 bridge, the localhost HTTP connection, the MCP server, project specifications, and build documentation.
Why use it?
It explains the project's security goals, documentation-driven workflow, architecture, and build process for producing the two-process system.

Instructions file for Claude Code

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

This is Creative-Inertia/OSCAR_Public's own configuration. It tells Claude Code how to work on OSCAR_Public 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 OSCAR_Public configures →

not rated 12repo 7mo ago A scan 1,417 tokens original Apache-2.0
View source ↗ Creative-Inertia/OSCAR_Public
Reuse

Borrowing it

Nothing to install: this file belongs to Creative-Inertia/OSCAR_Public. 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/Creative-Inertia/OSCAR_Public/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/Creative-Inertia/OSCAR_Public

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
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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.

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Per session 1,417 This file is loaded in full into every session.
When invoked 1,417 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 $0.01417 $0.01417
Opus 5.5 $0.00567 $0.00567
Sonnet 5.5 $0.00283 $0.00283
Haiku 4.5 $0.00142 $0.00142

Measured 2mo ago against content hash f328e3167ddc, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

OSCAR_Public 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 2mo 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 · 108 lines

How it starts

The opening of the file, as written. The whole thing — 108 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

OSCAR is a build package for creating a secure MCP (Model Context Protocol) server that gives Claude Code full control over Autodesk Fusion 360. It replaces insecure third-party MCPs with a clean, minimal, localhost-only alternative.

This repo is primarily documentation and specifications — not a running codebase. There are no build/test/lint commands. The output of following these docs is a two-process system built by Claude Code.

How to Use This Package

  1. Read docs/aurafriday-analysis/WHY-DISCONNECT.md — understand and remove any insecure MCP
  2. Feed prompt/MASTER-PROMPT.md to Claude Code — this is the complete build prompt
  3. Reference build-guide/BUILD-GUIDE.md for the full architecture spec and implementation details
  4. Reference docs/ and fusion-api/ for API details as needed during implementation

Architecture (What Gets Built)

A two-process system bridged by HTTP on localhost:

Claude Code ──stdio──> MCP Server (FastMCP, system Python, port configurable)
                              │
                         HTTP POST (127.0.0.1:45876)
                         Bearer token auth
                              │
                              ▼
                       Fusion Add-in (runs inside Fusion 360's process)
                         └── CustomEvent handler on main thread

Process 1: Fusion Add-in (fusion_bridge)

  • Runs INSIDE Fusion 360's bundled Python interpreter
  • Stdlib only — no pip, no external packages
  • HTTP server on a background daemon thread, bound to 127.0.0.1
  • Uses Fusion's CustomEvent system to marshal API calls to the main thread (the ONLY safe threading pattern)
  • Generates a random Bearer auth token on startup, shown in Fusion's TEXT COMMANDS panel

Process 2: MCP Server (fusion_mcp_server)

  • Separate Python process using FastMCP with stdio transport
  • Runs in system Python (can use pip packages: pip install mcp)
  • Receives tool calls from Claude, forwards as HTTP requests to the Fusion add-in

Read the full file on GitHub · 108 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. 2mo ago First seen · 108 lines · 1,417 tokens per session scan A f328e3167ddc

Subscribe to this mod's changes

OSCAR_Public CLAUDE.md is an instructions file published in the GitHub repository Creative-Inertia/OSCAR_Public (12 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 1,417 tokens to every session, about $0.0057 per session on Opus 5.5. 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 2026-08-30.

aicadclaudefusion360parametric
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