/**
 * MCP server lifecycle state machine.
 *
 * Pure transition logic, no side effects, no I/O.
 * All state changes flow through `applyTransition()`.
 */
import type { McpServerState } from './types.js';
/**
 * Returns `true` if transitioning from `from` to `to` is permitted by the
 * state machine definition.
 *
 * @param from - Current state
 * @param to   - Proposed next state
 */
export declare function canTransition(from: McpServerState, to: McpServerState): boolean;
/**
 * Returns all states reachable from the given state.
 *
 * @param from - Current state
 */
export declare function reachableFrom(from: McpServerState): ReadonlySet<McpServerState>;
/** Result of attempting a state transition. */
export type TransitionResult = {
    success: true;
    previous: McpServerState;
    next: McpServerState;
} | {
    success: false;
    reason: string;
};
/**
 * Attempt to apply a state transition.
 *
 * Returns `{ success: true, previous, next }` if the transition is valid,
 * or `{ success: false, reason }` if it is not.
 *
 * This function is pure, callers are responsible for updating the entry.
 *
 * @param current  - The current state of the server
 * @param target   - The desired next state
 */
export declare function applyTransition(current: McpServerState, target: McpServerState): TransitionResult;
/**
 * Returns `true` if the state represents an active/usable server.
 *
 * Both `connected` and `degraded` allow tool calls to proceed.
 */
export declare function isOperational(state: McpServerState): boolean;
/**
 * Returns `true` if the state is terminal for a reconnect cycle
 * (i.e., the manager should not attempt further reconnects automatically).
 */
export declare function isTerminal(state: McpServerState): boolean;
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