ca-shrimp
ece584b8f5
fix(agent): don't seed continuation stub after a context-overflow stream death
...
When a stream delivered text and then died on a context-overflow /
payload-too-large error, the partial content (often tens of KB) was seeded as
a length-continuation stub, growing the transcript monotonically. In a
session whose transcript cannot be compressed back under budget
(protect_last_n covers everything -> no_progress, or the summary would
itself be larger -> would_grow), every later request is larger than the one
that just failed — an unrecoverable loop where the user sees a 30+ minute
fake hang and the only remedy is killing the session (#106260 ).
classify_api_error already labels these errors context_overflow /
payload_too_large (should_compress=True). _partial_stream_stub now returns
an EMPTY stub marked _overflow_terminal for that class instead of seeding
the recovered text, and recover_from_truncation treats the marker as
terminal: the turn ends via the recovery contract with a clear message
(start /new) and the transcript is not polluted with the partial.
Normal partials (network stall, output-cap truncation, tool-call drops) are
unchanged — only the overflow error class changes behavior.
Tests: stub marker + empty content; a real streamed partial hitting a
'maximum context length' error returns the terminal stub; recover_from_
truncation ends the turn (no fragment/nudge appended) on the marker while a
normal stub still runs the continuation path. 67 streaming/continuation
regressions pass.
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