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teamchong
f024730261
Claude Code marks its system prompt with cache_control
{type:"ephemeral", ttl:"1h", scope:"global"}. When pxpipe relocates
that marker onto a rendered image, the new position is never a valid
global prefix (slab pages 1..N-1 and other injected blocks carry no
marker), so Anthropic rejects the whole request with 400
invalid_request_error — making pxpipe unusable in front of Claude Code.
Demote relocated markers to plain ephemeral by stripping the scope key
(type/ttl preserved) at all four relocation sites: the slab->history
anchor move, the static-system marker, and the reminder / tool_result
image renders. Markers without scope pass through untouched, so
byte-stability of existing traffic is unaffected. pxpipe still never
adds markers of its own.
Closes #95