Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add rules/mbosschaart/ultimate64mcp/ultimate-mcp-toolsgit clone --depth 1 https://github.com/mbosschaart/Ultimate64MCPWrote 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.
[](https://agentmods.dev/rules/mbosschaart/ultimate64mcp/ultimate-mcp-tools)<a href="https://agentmods.dev/rules/mbosschaart/ultimate64mcp/ultimate-mcp-tools"><img src="https://agentmods.dev/badge/rules/mbosschaart/ultimate64mcp/ultimate-mcp-tools.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00000 | $0.01750 |
| Opus 5 | $0.00000 | $0.00875 |
| Sonnet 5 | $0.00000 | $0.00350 |
| Haiku 4.5 | $0.00000 | $0.00175 |
Grade A, and why
ultimate-mcp-tools scanned grade A with 1 finding 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 4d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -X POST <mcp-server-url>/upload-prg \ How it starts
The opening of the file, as written. The whole thing — 264 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Commodore 64 Ultimate MCP Server - Tool Guide
This MCP server controls real Commodore 64 hardware via the Ultimate 64/II+ REST API.
Connection Management
Setting Up Connection
Always ensure connection is established before using other tools:
ultimate_set_connection: Set the C64's IP address
- hostname: "192.168.1.64" (required)
- port: 80 (optional, default)
ultimate_get_connection: Verify current connection
ultimate_version: Test API connectivity
Running Programs
For files ON the Ultimate device (USB/SD):
ultimate_run_program:
- file: "/Usb0/Games/game.prg" # Path on Ultimate filesystem
For files NOT on the device (remote upload):
ultimate_run_prg_binary:
- prg_data_base64: "AQgLCJ4A..." # Base64-encoded PRG
- url: "https://example.com/demo.prg" # OR download from URL
- file_path: "/local/path/demo.prg" # OR local server file (path on the SERVER filesystem)
Use ONE of the above parameters, not multiple.
Direct Upload (Recommended for Local Files)
If you have a PRG file on your local machine and want to run it via the MCP server (bypassing MCP protocol limits or path issues):
curl -X POST <mcp-server-url>/upload-prg \
-H "Content-Type: application/octet-stream" \
--data-binary @path/to/demo.prg
PRG File Format
PRG files start with 2-byte load address (little-endian):
- Byte 0: Low byte of load address
- Byte 1: High byte of load address
- Remaining bytes: Program data
Example: 01 08 ... = Load at $0801 (BASIC start)
Playing Music
SID Files (C64 native music)
ultimate_play_sid:
- file: "/Usb0/Music/Commando.sid"
- song_number: 1 # Optional, for multi-song SIDs
MOD Files (Amiga tracker music)
ultimate_play_mod:
- file: "/Usb0/Music/track.mod"
Memory Operations
Reading Memory
ultimate_read_memory:
- address: "D020" # Hex address (border color)
- length: 16 # Bytes to read (max 256)
Writing Memory
ultimate_write_memory:
- address: "D020" # Hex address
- data: "00" # Hex data (blue border)
ultimate_write_memory_binary:
- address: "C000" # Hex address
- file_path: "/path/to/data.bin"
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.
- 4d ago First seen · 264 lines · 1,750 tokens per session scan A 2794971c902f
ultimate-mcp-tools is a cursor rule published in the GitHub repository mbosschaart/Ultimate64MCP (21 stars, last pushed 8mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 1,750 tokens. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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