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open-prose

open-prose is a skill for Claude Code, Codex from openprose/prose. It costs 133 tokens per session (6,767 once invoked), scanned A, original, MIT.

A language and execution model for describing reusable work between multiple AI agents. OpenProse files can declare responsibilities, while scripts can define order, loops, conditions, parallel work, retries, and function calls.

In plain words
What is it for?
Use it to explain, initialize, compose, or run OpenProse programs and to coordinate multi-step agent work.
Why use it?
It gives multi-agent tasks a written structure instead of leaving coordination only in prompts. This makes the intended workflow and responsibilities easier to follow.

Skill for Claude CodeCodex

Part of the open-prose plugin — 1 skill shipped together

not rated 1.7k +2 2d ago A scan 133 tokens original MIT
View the source file openprose/prose
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.

agentmods
npx agentmods add skills/openprose/prose/open-prose
Any agent
npx skills add openprose/prose --skill open-prose
Clone the repo
git clone --depth 1 https://github.com/openprose/prose

Made for: Claude Code, Codex.

Or install open-prose, the plugin that ships this one along with the rest of its 1 skill.

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 open-prose

README.md
[![agentmods](https://agentmods.dev/badge/skills/openprose/prose/open-prose.svg)](https://agentmods.dev/skills/openprose/prose/open-prose)
Your own site
<a href="https://agentmods.dev/skills/openprose/prose/open-prose"><img src="https://agentmods.dev/badge/skills/openprose/prose/open-prose.svg" alt="Measured on agentmods" height="20"></a>
Per session 133 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 6,767 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00133 $0.06767
Opus 5 $0.00067 $0.03383
Sonnet 5 $0.00027 $0.01353
Haiku 4.5 $0.00013 $0.00677

Measured 4d ago against content hash 28696d9a8c1c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

open-prose 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 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.

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.

skills/open-prose/SKILL.md · 413 lines

How it starts

The opening of the file, as written. The whole thing — 413 lines — stays where its author put it; the contents beside it link to each section on GitHub.

OpenProse Skill

OpenProse has five load-bearing pieces:

Piece File Role
Contract Markdown contract-markdown.md Human-readable *.prose.md source format
Forme forme.md Semantic dependency-injection container that wires contracts
Prose VM prose.md Execution engine that runs responsibilities, functions, and pinned execution blocks
ProseScript prosescript.md Imperative scripting layer for ### Execution blocks and pattern delegation
Responsibility Runtime responsibility-runtime.md Responsibility-Oriented Architecture: standing goals, the reconciler, and compile/serve doctrine

Use Contract Markdown when authors want declarations and auto-wiring. Use ProseScript when authors want to pin choreography: order, loops, conditionals, parallelism, retries, and explicit function calls.

First 90 Seconds

After activation, choose the narrowest path that matches the user's intent:

User Intent Load First Then Load If Needed
Explain OpenProse or answer "how do I..." help.md examples/README.md, then one focused example
Initialize or compose an OpenProse program guidance/tenets.md guidance/authoring.md, then run std/ops/compose
Run a .prose.md responsibility or function contract-markdown.md state/README.md and the selected backend (state/filesystem.md by default); forme.md if responsibilities must be wired (### Requires → ### Maintains); prose.md to execute
Inspect or upgrade source layout changelog.md contract-markdown.md, prosescript.md if migration details require them
Write a new .prose.md responsibility or function contract-markdown.md guidance/tenets.md, guidance/authoring.md
Write pinned choreography prosescript.md contract-markdown.md if inside ### Execution
Compile or run a .png/.svg brief (a typed image) visual-source.md forme.md and compiler/index.prose.md to resolve + compile
Lint or review a responsibility or function contract-markdown.md forme.md for multi-responsibility wiring; guidance/authoring.md for design review
Work on Responsibility Runtime, responsibility-oriented source, the reconciler, compile, or serve semantics responsibility-runtime.md compiler/index.prose.md, compiler/ir-v0.md, concepts/responsibility.md, concepts/reconciler.md, forme.md
Install or update dependencies deps.md contract-markdown.md only if dependency references are ambiguous
Debug a completed run prose.md state/README.md and the run's backend doc; then std/evals/inspector if available

Read the full file on GitHub · 413 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.

  1. 4d ago First seen · 413 lines · 133 tokens per session scan A 28696d9a8c1c

Subscribe to this mod's changes

open-prose is a skill published in the GitHub repository openprose/prose (1,690 stars, last pushed 2d ago), licensed MIT. It adds 133 tokens to every session and 6,767 once invoked, about $0.0007 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 2026-08-30.

Building agentsPlanning
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