{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://8004.dev/schemas/agent-metadata.json",
  "title": "8004 Agent Metadata",
  "description": "JSON schema for AI agent metadata URI (8004 compatible)",
  "type": "object",
  "required": ["name"],
  "properties": {
    "name": {
      "type": "string",
      "description": "Agent display name",
      "maxLength": 64
    },
    "description": {
      "type": "string",
      "description": "Agent description and capabilities"
    },
    "image": {
      "type": "string",
      "format": "uri",
      "description": "Agent avatar/logo URL"
    },
    "external_url": {
      "type": "string",
      "format": "uri",
      "description": "Agent homepage or documentation"
    },
    "version": {
      "type": "string",
      "description": "Agent version (semver recommended)",
      "pattern": "^[0-9]+\\.[0-9]+\\.[0-9]+(-[a-zA-Z0-9]+)?$"
    },
    "capabilities": {
      "type": "object",
      "description": "Agent capabilities and protocols",
      "properties": {
        "mcp": {
          "type": "object",
          "description": "Model Context Protocol support",
          "properties": {
            "version": { "type": "string" },
            "tools": {
              "type": "array",
              "items": { "type": "string" }
            },
            "resources": {
              "type": "array",
              "items": { "type": "string" }
            }
          }
        },
        "a2a": {
          "type": "object",
          "description": "Agent-to-Agent protocol support",
          "properties": {
            "version": { "type": "string" },
            "skills": {
              "type": "array",
              "items": { "type": "string" }
            }
          }
        }
      }
    },
    "endpoints": {
      "type": "array",
      "description": "API endpoints this agent exposes",
      "items": {
        "type": "object",
        "properties": {
          "path": {
            "type": "string",
            "description": "Endpoint path (e.g., /api/chat)"
          },
          "method": {
            "type": "string",
            "enum": ["GET", "POST", "PUT", "DELETE"]
          },
          "description": {
            "type": "string"
          }
        },
        "required": ["path"]
      }
    },
    "skills": {
      "type": "array",
      "description": "OASF taxonomy skills",
      "items": {
        "type": "string"
      }
    },
    "domains": {
      "type": "array",
      "description": "OASF taxonomy domains",
      "items": {
        "type": "string"
      }
    },
    "model": {
      "type": "object",
      "description": "Underlying AI model info",
      "properties": {
        "provider": {
          "type": "string",
          "description": "Model provider (e.g., openai, anthropic, local)"
        },
        "name": {
          "type": "string",
          "description": "Model name (e.g., gpt-4, claude-3)"
        },
        "context_window": {
          "type": "integer",
          "description": "Context window size in tokens"
        }
      }
    },
    "pricing": {
      "type": "object",
      "description": "Usage pricing (if applicable)",
      "properties": {
        "model": {
          "type": "string",
          "enum": ["free", "per-request", "subscription", "custom"]
        },
        "currency": {
          "type": "string",
          "default": "USD"
        },
        "price_per_request": {
          "type": "number"
        }
      }
    },
    "attributes": {
      "type": "array",
      "description": "Custom attributes (NFT-style)",
      "items": {
        "type": "object",
        "properties": {
          "trait_type": { "type": "string" },
          "value": { "type": ["string", "number", "boolean"] }
        },
        "required": ["trait_type", "value"]
      }
    }
  }
}