Read-tool outputs were compacted at a 4000-byte gate before being stored
in metadata.parts, which is re-sent to the model every later turn. Whole-page
reads (tens of KB) got shrunk to a 500-char preview plus a "[truncated N chars]"
marker; on the next turn the model read that marker as a source truncation and
re-read the page, wasting tokens and producing wrong behavior.
- Raise MAX_TOOL_OUTPUT_BYTES 4000 -> 200_000 so normal reads are stored and
replayed verbatim; only a single >200 KB output is compacted as a backstop.
- Reword the inline string marker so it reads as a replay-history elision, not
a source truncation, and tells the model it can re-call the tool.
- Update doc comments and enlarge the compactToolOutput unit-test inputs above
the new 200 KB gate.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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