skillrt 0.1.0

A runtime and spec for executable markdown skills consumed by AI agents.
Documentation 
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{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://github.com/jakejjoyner/skillrt/blob/main/spec/frontmatter.schema.json",
  "title": "SKILL.md frontmatter",
  "description": "Schema for the YAML frontmatter of a structured SKILL.md file. Prose-mode skills have no frontmatter and do not validate against this schema.",
  "type": "object",
  "required": ["name", "version", "description"],
  "additionalProperties": true,
  "properties": {
    "name": {
      "type": "string",
      "description": "Skill identifier. Lowercase kebab-case is recommended.",
      "pattern": "^[a-z0-9][a-z0-9._-]*$",
      "minLength": 1,
      "maxLength": 128
    },
    "version": {
      "type": "string",
      "description": "SemVer 2.0.0 version.",
      "pattern": "^(0|[1-9]\\d*)\\.(0|[1-9]\\d*)\\.(0|[1-9]\\d*)(?:-((?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\\.(?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\\+([0-9a-zA-Z-]+(?:\\.[0-9a-zA-Z-]+)*))?$"
    },
    "description": {
      "type": "string",
      "description": "One-line summary shown in registry listings.",
      "maxLength": 512
    },
    "authors": {
      "type": "array",
      "items": { "type": "string" },
      "default": []
    },
    "license": {
      "type": "string",
      "description": "SPDX license identifier (e.g., MIT, Apache-2.0).",
      "default": "UNLICENSED"
    },
    "runtime": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "type": {
          "type": "string",
          "description": "Identifies the runtime family that can execute this skill.",
          "default": "markdown-skill",
          "examples": ["markdown-skill", "anthropic-skill", "mcp-tool"]
        },
        "min-version": {
          "type": "string",
          "description": "Minimum runtime version (SemVer)."
        }
      }
    },
    "inputs": {
      "type": "array",
      "default": [],
      "items": {
        "type": "object",
        "required": ["name", "type"],
        "additionalProperties": false,
        "properties": {
          "name": {
            "type": "string",
            "pattern": "^[a-zA-Z_][a-zA-Z0-9_]*$"
          },
          "type": {
            "type": "string",
            "enum": ["string", "number", "boolean", "file", "url", "json"]
          },
          "required": {
            "type": "boolean",
            "default": false
          },
          "description": { "type": "string" },
          "default": {}
        }
      }
    },
    "outputs": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "type": {
          "type": "string",
          "enum": ["text", "json", "file"]
        },
        "schema": {
          "description": "Optional JSON Schema describing the output shape."
        }
      },
      "required": ["type"]
    },
    "dependencies": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "mcp-servers": {
          "type": "array",
          "items": { "type": "string" },
          "default": [],
          "description": "MCP servers this skill expects to be available."
        },
        "skills": {
          "type": "array",
          "items": {
            "type": "string",
            "description": "name@semver-range, e.g., 'pr-review@^0.1.0'"
          },
          "default": []
        },
        "tools": {
          "type": "array",
          "items": { "type": "string" },
          "default": [],
          "description": "External CLI tools (e.g., bash, python, curl) the skill shells out to."
        }
      }
    },
    "permissions": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "network": {
          "type": "array",
          "items": { "type": "string" },
          "default": [],
          "description": "Allowed network destinations. Use ['*'] for any, [] for none."
        },
        "filesystem": {
          "type": "array",
          "items": { "type": "string" },
          "default": [],
          "description": "Filesystem path globs the skill may read/write."
        },
        "env": {
          "type": "array",
          "items": { "type": "string" },
          "default": [],
          "description": "Environment variables the skill may read."
        }
      }
    },
    "tags": {
      "type": "array",
      "items": { "type": "string" },
      "default": [],
      "description": "Free-form tags for discoverability."
    }
  },
  "examples": [
    {
      "name": "pr-review",
      "version": "0.1.0",
      "description": "Review a GitHub pull request.",
      "authors": ["jakejjoyner"],
      "license": "MIT",
      "runtime": {
        "type": "markdown-skill",
        "min-version": "0.1.0"
      },
      "inputs": [
        { "name": "pr_url", "type": "url", "required": true }
      ],
      "outputs": {
        "type": "json"
      },
      "dependencies": {
        "tools": ["gh"]
      },
      "permissions": {
        "network": ["api.github.com"],
        "env": ["GH_TOKEN"]
      },
      "tags": ["github", "code-review"]
    }
  ]
}