A successful file_write/file_edit echoes the whole file body (+ diff) back in
its tool result — up to ~30k chars, which pushed the traced Gemma4 request past
its context window. The write already happened and its full output is durable in
the event log/CAS; the model only needs a receipt that it landed. Replace each
exit=0 write result with a one-line receipt (path + elision marker) in the
context builder; reads, gate output, and nonzero-exit writes stay verbatim.
Derived-only pass over the transcript — authoritative events are untouched, so
it's replay-safe.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
kami
f860d1b8af