Constant TRUNCATION_INSTRUCTION 

const TRUNCATION_INSTRUCTION: &str = "This result was too large to return in full and was cut off \
    mid-way, so it may end in the middle of a value. Treat it as a partial view: say so before \
    answering from it, do not claim anything about what a complete result would have contained, \
    and prefer narrowing the call (a single id, fewer facets) over reasoning from the fragment.";

What a truncated tool output leaves out, phrased for the model rather than for a log.