{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://persona-atoms.com/schemas/composition-v1.json",
  "title": "persona-atoms v1 persona composition",
  "description": "A persona composition assembles voice-profile + role-definition + behavioural-constraints + knowledge-boundaries + tone-parameters into a complete identity an agent can assume. Optional work-contract binding adds operational semantics without replacing the role-definition identity anchor. Every composition must satisfy the prompt-conformance rule: it must be renderable to a deterministic system-prompt string from the bound atoms alone.",
  "type": "object",
  "required": [
    "schema",
    "type",
    "id",
    "version",
    "name",
    "role_definition",
    "voice_profile",
    "knowledge_boundaries",
    "tone_parameters"
  ],
  "additionalProperties": false,
  "properties": {
    "schema": {
      "type": "string",
      "const": "https://persona-atoms.com/schemas/composition-v1.json"
    },
    "type": {
      "type": "string",
      "const": "persona"
    },
    "id": {
      "type": "string",
      "pattern": "^[a-z0-9][a-z0-9-]{1,62}[a-z0-9]$",
      "description": "URL-safe slug; unique within the personas/ directory."
    },
    "version": {
      "type": "string",
      "pattern": "^[0-9]+\\.[0-9]+\\.[0-9]+(?:-[A-Za-z0-9.-]+)?$"
    },
    "name": {
      "type": "string",
      "minLength": 1,
      "maxLength": 80
    },
    "description": {
      "type": "string",
      "maxLength": 500
    },
    "role_definition": {
      "$ref": "#/$defs/atom-ref",
      "description": "Reference to the role-definition atom that anchors this persona's purpose."
    },
    "voice_profile": {
      "$ref": "#/$defs/atom-ref",
      "description": "Reference to the voice-profile atom governing surface-form characteristics."
    },
    "behavioural_constraints": {
      "type": "array",
      "items": { "$ref": "#/$defs/atom-ref" },
      "uniqueItems": true,
      "description": "Zero or more behavioural-constraint atoms. The persona obeys all of them unconditionally."
    },
    "knowledge_boundaries": {
      "type": "array",
      "items": { "$ref": "#/$defs/atom-ref" },
      "minItems": 1,
      "uniqueItems": true,
      "description": "One or more knowledge-boundary atoms. Every persona MUST declare at least one (boundary-coverage rule)."
    },
    "tone_parameters": {
      "$ref": "#/$defs/atom-ref",
      "description": "Reference to the tone-parameter atom setting this persona's affective profile."
    },
    "work_contract": {
      "$ref": "#/$defs/atom-ref",
      "description": "Optional reference to a work-contract atom defining how this persona participates in a workflow."
    },
    "class": {
      "type": "string",
      "enum": ["planner", "executor", "reviewer", "moderator", "coordinator", "aggregator"],
      "description": "Optional class metadata for workflow-aware runtimes."
    },
    "domain": {
      "type": "string",
      "maxLength": 80,
      "description": "Optional domain metadata for workflow-aware runtimes."
    },
    "extends_brand": {
      "$ref": "#/$defs/external-ref",
      "description": "Optional reference to a brand-atoms brand for voice continuity. When present, the persona's voice inherits the brand's guidelines."
    },
    "system_prompt_template": {
      "type": "string",
      "maxLength": 4000,
      "description": "Optional: an explicit Mustache-style template used during rendering to assemble the system prompt from the bound atoms. If absent, the runtime uses its default rendering algorithm."
    },
    "tags": {
      "type": "array",
      "items": { "type": "string", "minLength": 1, "maxLength": 40 },
      "uniqueItems": true
    },
    "vendors": {
      "type": "array",
      "items": { "type": "string", "enum": ["claude", "gpt", "llama", "gemini", "mistral", "any"] },
      "uniqueItems": true,
      "description": "LLM families this persona is known to work well with."
    },
    "lifecycle": {
      "type": "string",
      "enum": ["draft", "stable", "deprecated", "archived"],
      "default": "draft"
    },
    "license": {
      "type": "string",
      "description": "SPDX license identifier.",
      "default": "Apache-2.0"
    },
    "provenance": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "source": { "type": "string" },
        "addedBy": { "type": "string" },
        "addedAt": { "type": "string", "format": "date-time" }
      }
    }
  },
  "$defs": {
    "atom-ref": {
      "type": "object",
      "required": ["ref", "version"],
      "additionalProperties": false,
      "properties": {
        "ref": {
          "type": "string",
          "pattern": "^persona-atoms://atoms/[a-z-]+/[a-z0-9-]+$",
          "description": "Canonical atom URI. Format: persona-atoms://atoms/<type>/<id>"
        },
        "version": {
          "type": "string",
          "pattern": "^[0-9]+\\.[0-9]+\\.[0-9]+(?:-[A-Za-z0-9.-]+)?$",
          "description": "Version of the referenced atom at composition time."
        }
      }
    },
    "external-ref": {
      "type": "object",
      "required": ["ref", "version"],
      "additionalProperties": false,
      "properties": {
        "ref": {
          "type": "string",
          "pattern": "^[a-z-]+-atoms://[a-z-]+/[a-z0-9/-]+$",
          "description": "Cross-catalog reference URI. Format: <catalog>-atoms://<type>/<path>"
        },
        "version": {
          "type": "string",
          "pattern": "^[0-9]+\\.[0-9]+\\.[0-9]+(?:-[A-Za-z0-9.-]+)?$"
        }
      }
    }
  }
}