Struct toolSlot

internal/llm/llm.go:589–592

toolSlot accumulates one streamed tool call. OpenAI delivers `arguments` as JSON fragmented across chunks, each fragment invalid alone; we append raw and parse once, in resolve().

// readSSE reads OpenAI SSE frames until [DONE] or EOF, forwarding
// content/reasoning/tool-call events to out. Returns the final assistant
// message (content + accumulated tool calls), the server completion and prompt
// token counts, and any scanner error. parent is threaded through so sends
// abort on cancellation instead of blocking on an undrained buffer.
// serverStreamError is an error the SERVER reported inside the SSE stream, as
// opposed to a transport failure. Typed so the replay path can tell the two
// apart: resending a request the server already refused just repeats the refusal.