Aari
3be3969f8f
fix(agent): snap tool-output tail forward so fallback truncation respects max_chars ( #4017 )
...
* fix(agent): snap tool-output tail forward so fallback truncation respects max_chars
_snap_to_line_boundary() moves an offset backwards to the preceding newline.
That is correct for the head's end offset, but _build_fallback() also applied it
to the tail's start offset, where moving backwards lengthens the tail. On output
whose last newline sits in the second half (log lines followed by one long
unbroken line: minified JSON, base64 artifacts), the returned string exceeded
max_chars by up to 17x, defeating the guard that exists to stop a single large
tool result from blowing the model context.
Add _snap_start_to_line_boundary(), the forward-snapping mirror, and use it for
the tail offset. The existing head_end guard becomes redundant because a forward
snap can only move the tail start away from the head.
test_result_never_exceeds_max_chars already asserted this invariant but passed
newline-free content, so the snapping branch was never exercised.
* test(agent): pin the forward-snap direction of the fallback tail
The bound test only asserts that the result fits max_chars. Its content has
no newline inside the tail's snap window, so _snap_start_to_line_boundary
returns pos unchanged and the test stays green even with the snap removed.
Place a newline in the window so the snap has to fire: the tail must begin
after it, which the pre-fix backward snap does not do.
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