Open Specification v0.2

Prompts
as code.

A Markdown-based spec for parameterized, portable, executable AI prompts. Write once, run anywhere, version everything.

analyze.rune.md

            ---
            name: competitor_analysis
            version: 1.0.0
            model: claude-sonnet-4
            temperature: 0.5
            
            inputs:
              - name: company
                type: string
                required: true
              - name: industry
                type: enum
                options: [saas, fintech, climatetech]
            ---
            
            ## System
            You are a strategy consultant.
            
            ## Prompt
            Analyze {{company}} in {{industry}}.
          

The Problem

Prompts deserve better tooling.

AI prompts are engineering artifacts, but we treat them like sticky notes. RuneFile fixes that.

Without RuneFile

Prompts scattered across Notion, Slack, random .txt files
Copy-paste variables by hand every time
No version history — "which version worked?"
Can't share prompts as reusable units
Zero validation — silent failures everywhere
Locked to one provider's playground

With RuneFile

One .rune.md file per prompt, in your repo
Typed inputs with validation and defaults
Git-native versioning with semantic versions
Share, import, compose prompts like functions
Errors caught before execution
Provider-agnostic — run on any model

Spec Highlights

Everything you need.
Nothing you don't.

⚡

Typed Inputs

String, text, number, boolean, enum, array. With defaults, constraints, and descriptions. Generate forms automatically.

🔀

Multi-Turn

Ordered sections map to messages. Repeat ## User and ## Assistant for few-shot patterns. Context gets prepended.

🧩

Composition

Include partials. Reuse system prompts. Override sections. Build prompt libraries from composable pieces.

📐

Output Schemas

Declare JSON Schema for structured outputs. Runners validate responses automatically. No more parsing surprises.

🛡

Input Sanitization

Template injection protection built into the spec. Enum validation, length limits, and strict mode for production.

🔧

Tool Definitions

Define function-calling tools in readable Markdown. The runner translates to your provider's format.

Promptsas code.