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promptl
PromptL syntax guide for writing prompts in the Latitude platform. This skill should be used when writing, reviewing, or editing PromptL prompts. Triggers on tasks involving creating prompts, configuring LLM parameters, using variables, conditionals, loops, chains, tools, agents, or any prompt engineering in Latitude.
MIT
author version
latitude
1.0.0

PromptL Syntax Guide

Comprehensive guide for writing PromptL prompts in the Latitude platform. PromptL is a versatile, human-readable language that simplifies defining and managing dynamic prompts for LLMs.

When to Apply

Reference these guidelines when:

  • Writing new PromptL prompts for Latitude
  • Configuring LLM models and parameters
  • Using variables, conditionals, or loops in prompts
  • Creating multi-step chains or agentic workflows
  • Defining tools for function calling
  • Referencing other prompts (snippets)
  • Working with structured JSON output schemas

Syntax Categories

Category Purpose Key Syntax
Configuration Define model, provider, and parameters --- YAML block
Messages Structure conversations <system>, <user>, <assistant>, <tool>
Variables Dynamic content {{ variable }}
Conditionals Dynamic flow control {{ if }}, {{ else }}, {{ endif }}
Loops Iterate over lists {{ for item in list }}, {{ endfor }}
Chains Multi-step prompts <step>
Tools Function calling tools: in config
Agents Autonomous workflows type: agent
Snippets Reusable prompts <prompt path="..." />
Content Multi-modal content <content-image>, <content-file>

Quick Reference

Configuration Block

---
provider: OpenAI
model: gpt-4o
temperature: 0.7
top_p: 0.9
maxSteps: 20
---

Message Tags

  • <system> - System instructions
  • <user> - User messages
  • <assistant> - Assistant responses
  • <tool> - Tool interaction results
  • <message role="..."> - Generic message tag

Variables

{{ variable_name }}
{{ variable || "default" }}
{{ set myVar = "value" }}

Conditionals

{{ if condition }}
  content
{{ else }}
  alternative
{{ endif }}

Loops

{{ for item, index in items }}
  {{ index }}: {{ item }}
{{ else }}
  No items
{{ endfor }}

Chains (Multi-step)

<step as="result">
  First step content
</step>

<step>
  Use {{ result }} from previous step
</step>

Tools Configuration

tools:
  - tool_name:
      description: What the tool does
      parameters:
        type: object
        properties:
          param_name:
            type: string
            description: Parameter description
        required:
          - param_name

Agents

---
type: agent
provider: OpenAI
model: gpt-4o
tools:
  - latitude/search
agents:
  - agents/sub-agent-path
maxSteps: 40
---

Structured Output

schema:
  type: object
  properties:
    field_name:
      type: string
      description: Field description
  required:
    - field_name

Prompt References (Snippets)

<prompt path="relative/path/to/prompt" />
<prompt path="shared/policies" variable={{ value }} />

Content Types

<content-text>Plain text</content-text>
<content-image>{{ image_url }}</content-image>
<content-file mime="application/pdf">{{ file_data }}</content-file>

How to Use

Read the AGENTS.md file for the complete detailed guide with all syntax explanations, examples, and best practices.

Each section contains:

  • Detailed explanation of the feature
  • Correct usage examples
  • Common mistakes to avoid
  • Best practices and tips