/**
 * toolName — the LLM tool-name law: the charset every major provider enforces,
 * the strict check (`assertValidToolName`) and the dev-mode warning
 * (`warnIfInvalidToolName`) that `defineTool` runs. A leaf so that every
 * layer that mints a tool name — `tools/tools.ts` · `defineTool`, the tool
 * registry, the coverage result's `tryInstead` — asks the same rule.
 */
/**
 * STRICT validation — throws a clear, actionable error if a tool name can't be
 * sent to an LLM. Exposed for consumers who want to fail hard (e.g. in a build
 * step or a test). The library itself only WARNS (see `warnIfInvalidToolName`),
 * because a name is provider-specific: a mock or a name-sanitizing custom provider
 * may accept dotted/namespaced names that OpenAI/Anthropic reject.
 */
export declare function assertValidToolName(name: unknown): asserts name is string;
/**
 * DEV-MODE heads-up (never throws): warns once-per-call if a tool name will be
 * rejected by OpenAI/Anthropic. Production and non-dev runs pay nothing. This is
 * the library's default guard (Convention: dev diagnostics warn, they don't throw)
 * — keeping mock/custom-provider + namespaced-name setups working. Reach for
 * `assertValidToolName` when you want a hard failure.
 */
export declare function warnIfInvalidToolName(name: unknown): void;