Files
hermes-agent/agent
Teknium 2a1e615565 fix: persist non-NULL system prompt on fresh turn setup (#45499) (#52616)
build_turn_context() created the DB session row via _ensure_db_session()
before the system prompt was restored/built, so a fresh API/gateway agent
carrying client-managed history inserted a row with system_prompt=NULL. That
tripped the misleading 'stored system prompt is null; rebuilding from scratch
... investigate the previous turn's write path' warning and a guaranteed
first-turn prefix cache miss. Move row creation to after _cached_system_prompt
is populated.

Verified live (OpenRouter + claude-sonnet-4.5): persistent-agent turns show
cache_read jumping to the full prefix on turn 2+ (write 24411 -> read 24411),
and the persisted system_prompt is non-NULL so fresh-agent restore keeps the
prefix cache warm.

Tests: turn-context ordering regression asserting _ensure_db_session runs
after _cached_system_prompt is populated.
2026-06-25 12:54:19 -07:00
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