c64

c64 is an agent for Claude Code from dylan/claude. It costs 0 tokens per session (3,279 once invoked), scanned A, original, no licence file.

A planning and review agent for Commodore 64 demoscene code, including 6502 and 6510 processor code. It considers processor cycles, memory bytes, raster timing, interrupts, and memory layout when choosing an approach.

In plain words
What is it for?
Use it to plan or review hot routines, raster and interrupt schemes, memory maps, and visual effects built with assembly or supported C and Zig toolchains.
Why use it?
Commodore 64 effects and time-critical routines have tight limits on processing time and memory. This helps evaluate those limits before and after code changes.

Agent for Claude Code

Written for Claude Code: effort in frontmatter. Also seen: model in frontmatter.

Part of the c64 plugin — 1 skill, 1 agent shipped together

Good fit Use it to plan or review hot routines, raster and interrupt schemes, memory maps, and visual effects built with assembly or supported C and Zig toolchains.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/dylan/claude/c64
View source ↗ dylan/claude
Install

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.

Clone the repo
git clone --depth 1 https://github.com/dylan/claude

Made for: Claude Code.

Or install c64, the plugin that ships this one along with the rest of its 1 skill, 1 agent.

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 c64

README.md
[![agentmods](https://agentmods.dev/badge/agents/dylan/claude/c64/github.svg)](https://agentmods.dev/agents/dylan/claude/c64)
Your own site
<a href="https://agentmods.dev/agents/dylan/claude/c64"><img src="https://agentmods.dev/badge/agents/dylan/claude/c64/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 c64

Your own site · 80×15
<a href="https://agentmods.dev/agents/dylan/claude/c64"><img src="https://agentmods.dev/badge/agents/dylan/claude/c64.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,279 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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 $0.00000 $0.03279
Opus 5.5 $0.00000 $0.01312
Sonnet 5.5 $0.00000 $0.00656
Haiku 4.5 $0.00000 $0.00328

Measured 26d ago against content hash f2d68e47e76d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

c64 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 26d 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.

plugins/c64/agents/c64.md · 78 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 26d ago First seen · 78 lines · 0 tokens per session scan A f2d68e47e76d

Subscribe to this mod's changes

c64 is an agent published in the GitHub repository dylan/claude (2 stars, last pushed 27d ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 3,279 tokens. 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 2026-09-24.

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