Prompt Renderer

Overview

You send a template of at most 512 KiB, a variables object, syntax SQUILLIFY_BRACES_V1, missing ERROR or EMPTY, and escape NONE or JSON_STRING. We substitute dotted paths, treat names such as __proto__ as ordinary keys, and reject loop or section tags. {{ and }} are literal braces. Output stops at 2 MiB. We never call a model, include files, or evaluate conditionals.

A full template language is an execution surface. This renderer only substitutes dotted paths so a prompt can be filled without running code.

When to use it

Scope

Non-goals

• Does not evaluate loops, sections or conditionals
• Does not include files or execute code
• Does not call a model

Properties

Capabilities

Cost & billing

Flat rate per invocation

File handling

How we handle your data

Input schema

Output schema

API contract

curl -sS -X POST "$BASE/v1/execute" -H "Authorization: Bearer $KEY" -H 'Content-Type: application/json' -d '{"skillKey":"ai.prompt_render","input":{"template":"Hello {name}","variables":{"name":"Priya"}}}'

import { Squillify } from "@squillify/sdk";

const sq = new Squillify({ apiKey: process.env.SQUILLIFY_API_KEY });

const { output } = await sq.execute("ai.prompt_render", {"template":"Hello {customer.name}, id {id}.","variables":{"customer":{"name":"Priya"},"id":"NW-1","locale":"en-GB"}});

Errors

Other limits

Limitations

• Does not evaluate loops, sections or conditionals
• Does not include files or execute code
• Does not call a model
• Mustache or Handlebars templates with sections
• Templates that need a live model call

How to call

POST /v1/execute (requires authentication)

{
  "skillKey": "ai.prompt_render",
  "input": {
    "template": "Hello {customer.name}, id {id}.",
    "variables": {
      "customer": {
        "name": "Priya"
      },
      "id": "NW-1",
      "locale": "en-GB"
    }
  }
}

Examples

{
  "template": "Hello {customer.name}, id {id}.",
  "variables": {
    "customer": {
      "name": "Priya"
    },
    "id": "NW-1",
    "locale": "en-GB"
  }
}

{
  "missingMode": "ERROR",
  "referenced": [
    "customer.name",
    "id"
  ],
  "outputBytes": 21,
  "escape": "NONE",
  "syntax": "SQUILLIFY_BRACES_V1",
  "rendered": "Hello Priya, id NW-1.",
  "unused": [
    "locale"
  ],
  "missing": []
}

{
  "escape": "JSON_STRING",
  "variables": {
    "note": "a \"quote\""
  },
  "template": "Say {{hello}} {note}"
}

{
  "missingMode": "ERROR",
  "referenced": [
    "note"
  ],
  "outputBytes": 23,
  "escape": "JSON_STRING",
  "syntax": "SQUILLIFY_BRACES_V1",
  "rendered": "Say {hello} a \\\"quote\\\"",
  "unused": [],
  "missing": []
}

Recommended use cases

• Fill a small prompt template from a structured variables object
• JSON-escape substitutions before you embed them in a larger JSON prompt

Avoid for

• Mustache or Handlebars templates with sections
• Templates that need a live model call

Related skills

Composable with

Safety & privacy

• Runs without calling any external service.
• Your payloads are never stored permanently.
• Telemetry captures metadata only — never your payload contents.
• We never train models on your payloads.
• No human reviews your payloads.

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