/**
 * Constants for MCP SEP-2640 (Skills Extension) conformance.
 *
 * SEP-2640 defines a convention for serving Agent Skills over MCP using the
 * existing Resources primitive under the `skill://` URI scheme. The extension
 * adds no new protocol methods — only a capability declaration and URI shape.
 *
 * @see https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2640
 * @see https://github.com/modelcontextprotocol/experimental-ext-skills
 */
/**
 * The extension identifier as declared in the server `initialize` response
 * under `capabilities.extensions[<id>]`.
 */
export declare const SEP_2640_EXTENSION_ID: "io.modelcontextprotocol/skills";
/**
 * Reverse-DNS namespace prefix for `_meta` keys on skill resources.
 * Per skill-meta-keys.md, MCP-transport-specific metadata SHOULD use this
 * prefix; skill-level semantics belong in frontmatter, not `_meta`.
 */
export declare const SEP_2640_META_NAMESPACE: "io.modelcontextprotocol.skills/";
/**
 * Singular `skill://` URI scheme used by SEP-2640 and four converged
 * implementations (FastMCP 3.0, NimbleBrain, skilljack-mcp, skillsdotnet).
 *
 * This is the only URI scheme FrontMCP serves skills under — there is no
 * back-compat plural `skills://` scheme.
 */
export declare const SKILL_URI_SCHEME: "skill://";
/**
 * Well-known URI for the skill discovery index, modelled after the
 * Agent Skills `/.well-known/agent-skills/index.json` shape.
 */
export declare const SKILL_INDEX_URI: "skill://index.json";
/**
 * Schema URI for the index document, matching the agentskills.io
 * discovery RFC v0.2.0. Clients SHOULD verify this before parsing.
 */
export declare const SKILL_INDEX_SCHEMA_URI: "https://schemas.agentskills.io/discovery/0.2.0/schema.json";
/**
 * Index entry types per SEP-2640 §Discovery.
 */
export type SkillIndexEntryType = 'skill-md' | 'mcp-resource-template' | 'archive';
/**
 * SEP-2640 index entry. Mirrors the agentskills.io well-known index
 * format with two adjustments: `url` is a full MCP resource URI (any
 * scheme the server serves), and `digest` is omitted (transport handles
 * integrity over an authenticated MCP connection).
 */
export interface SkillIndexEntry {
    /** Type of entry. */
    type: SkillIndexEntryType;
    /** Skill name — required for `skill-md`, omitted for `mcp-resource-template`. */
    name?: string;
    /** Description of the skill or addressable space. */
    description: string;
    /**
     * For `skill-md`: full resource URI of the skill's `SKILL.md`.
     * For `mcp-resource-template`: an RFC 6570 URI template.
     * For `archive`: full resource URI of the archive resource.
     */
    url: string;
}
/**
 * SEP-2640 index document shape.
 */
export interface SkillIndexDocument {
    $schema: typeof SKILL_INDEX_SCHEMA_URI;
    skills: SkillIndexEntry[];
}
/**
 * Recommended MIME type for a `SKILL.md` resource.
 */
export declare const SKILL_MD_MIME_TYPE: "text/markdown";
/**
 * Recommended MIME type for the index resource.
 */
export declare const SKILL_INDEX_MIME_TYPE: "application/json";
/**
 * MIME types acceptable for archive distribution per SEP-2640 ADR
 * 2026-04-19 (Archive Distribution).
 */
export declare const SKILL_ARCHIVE_MIME_TYPES: readonly ["application/zip", "application/x-tar"];
/**
 * Recommended `annotations.priority` for the primary `SKILL.md` resource.
 * Hosts use this to decide what to load first under progressive disclosure.
 */
export declare const SKILL_MD_PRIORITY: 0.8;
/**
 * Recommended `annotations.priority` for supporting reference / example /
 * script files.
 */
export declare const SKILL_SUPPORT_PRIORITY: 0.3;
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