A skill pack for OpenProse, a programming language for describing AI workflows. It runs prose commands and coordinates multiple AI sessions or agents.

Use it when working with OpenProse, `.prose` files, prose commands, multi-agent scripts, or workflows that define named sessions.

It provides a way to execute, compile, update, or get help with OpenProse programs instead of handling those files and commands manually.

prose — Skill for Claude Code and Codex by ApiliumCode/mayros

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.

Any agent

npx skills add ApiliumCode/mayros --skill prose

Clone the repo

git clone --depth 1 https://github.com/ApiliumCode/mayros

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/apiliumcode/mayros/prose/github.svg)](https://agentmods.dev/skills/apiliumcode/mayros/prose)

Your own site

<a href="https://agentmods.dev/skills/apiliumcode/mayros/prose"><img src="https://agentmods.dev/badge/skills/apiliumcode/mayros/prose/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/apiliumcode/mayros/prose"><img src="https://agentmods.dev/badge/skills/apiliumcode/mayros/prose.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,554 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin 95% copy Near-identical to another mod 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.

Model	Per session	Once invoked
Fable 5.1	$0.00036	$0.03554
Opus 5.5	$0.00014	$0.01422
Sonnet 5.5	$0.00007	$0.00711
Haiku 4.5	$0.00004	$0.00355

Measured 1mo ago against content hash 50e217f62b26, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

prose 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 1mo 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.

- **Remote fetch** == Mayros `web_fetch` (or `exec` with curl when POST is required)

Origin

This is a copy

95% identical to prose — 10 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

extensions/open-prose/skills/prose/SKILL.md · 324 lines

How it starts

The opening of the file, as written. The whole thing — 324 lines — stays where its author put it; the contents beside it link to each section on GitHub.

OpenProse Skill

OpenProse is a programming language for AI sessions. LLMs are simulators—when given a detailed system description, they don't just describe it, they simulate it. The prose.md specification describes a virtual machine with enough fidelity that a Prose Complete system reading it becomes that VM. Simulation with sufficient fidelity is implementation. You are the Prose Complete system.

Mayros Runtime Mapping

Task tool in the upstream spec == Mayros sessions_spawn
File I/O == Mayros read/write
Remote fetch == Mayros web_fetch (or exec with curl when POST is required)

When to Activate

Activate this skill when the user:

Uses ANY prose command (e.g., prose boot, prose run, prose compile, prose update, prose help, etc.)
Asks to run a .prose file
Mentions "OpenProse" or "prose program"
Wants to orchestrate multiple AI agents from a script
Has a file with session "..." or agent name: syntax
Wants to create a reusable workflow

Command Routing

When a user invokes prose <command>, intelligently route based on intent:

Command	Action
`prose help`	Load `help.md`, guide user to what they need
`prose run <file>`	Load VM (`prose.md` + state backend), execute the program
`prose run handle/slug`	Fetch from registry, then execute (see Remote Programs below)
`prose compile <file>`	Load `compiler.md`, validate the program
`prose update`	Run migration (see Migration section below)
`prose examples`	Show or run example programs from `examples/`
Other	Intelligently interpret based on context

Important: Single Skill

There is only ONE skill: open-prose. There are NO separate skills like prose-run, prose-compile, or prose-boot. All prose commands route through this single skill.

Read the full file on GitHub · 324 lines

Files

What ships with it

60 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

1mo ago First seen · 324 lines · 36 tokens per session scan A 50e217f62b26

Subscribe to this mod's changes

prose is a skill published in the GitHub repository ApiliumCode/mayros (13 stars, last pushed 3mo ago), licensed MIT. It adds 36 tokens to every session and 3,554 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). It is 95% identical to prose, differing in 10 lines, and is treated as a copy.

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