/**
 * Detects tool-parameter schemas that pass structural JSON-Schema validation
 * (so {@link isValidJsonSchema} accepts them) yet make OpenAI-style providers
 * reject the whole request with HTTP 400 — namely an `enum`/`const` whose
 * value(s) cannot satisfy the node's declared `type`. MCP servers emit these
 * when a nullable/array branch is built incorrectly (e.g. a non-null `enum`
 * copied onto a `type: "null"` branch, or an `enum` placed on an `array`
 * schema instead of its `items`). One such tool 400s the entire turn, so
 * callers quarantine just the offending tool. See issue #2652.
 */
/**
 * Walk a tool parameter schema for OpenAI-strict `enum`/`const`-vs-`type`
 * contradictions. Returns a JSON-pointer-ish path to the first offending node,
 * or `null` when the schema is safe to emit.
 */
export declare function findStrictToolSchemaViolation(schema: unknown, path?: string): string | null;