Agent failed before reply: LLM request failed: provider rejected the request schema or tool payload.

错误追踪报告：Agent failed before reply: LLM request failed: provider rejected the request schema or tool payload.

一、完整调用链（6 层）

Provider API (HTTP 400/422) ↓ 返回错误响应 pi-ai (AssistantMessage.stopReason = "error", errorMessage = raw) ↓ [1] classifyProviderRuntimeFailureKind() → "schema" ↓ errors.ts:896 [2] isSchemaErrorMessage(raw) = true ↓ errors.ts:455-457 [3] classifyProviderRuntimeFailureKind() = "schema" ↓ errors.ts:1122 [4] formatAssistantErrorText() → "LLM request failed: provider rejected the request schema or tool payload." ↓ errors.ts:964-1122 [5] agent-runner-execution.ts → buildExternalRunFailureReply(me