After a conversation gets compressed, run_agent's _compress_context ends
the parent session and creates a continuation child with the same logical
conversation. Every list affordance in the codebase (list_sessions_rich
with its default include_children=False, plus the CLI/TUI/gateway/ACP
surfaces on top of it) hid those children, and resume-by-ID on the old
root landed on a dead parent with no messages.
Fix: lineage-aware projection on the read path.
- hermes_state.py::get_compression_tip(session_id) — walk the chain
forward using parent.end_reason='compression' AND
child.started_at >= parent.ended_at. The timing guard separates
compression continuations from delegate subagents (which were created
while the parent was still live) without needing a schema migration.
- hermes_state.py::list_sessions_rich — new project_compression_tips
flag (default True). For each compressed root in the result, replace
surfaced fields (id, ended_at, end_reason, message_count,
tool_call_count, title, last_active, preview, model, system_prompt)
with the tip's values. Preserve the root's started_at so chronological
ordering stays stable. Projected rows carry _lineage_root_id for
downstream consumers. Pass False to get raw roots (admin/debug).
- hermes_cli/main.py::_resolve_session_by_name_or_id — project forward
after ID/title resolution, so users who remember an old root ID (from
notes, or from exit summaries produced before the sibling Bug 1 fix)
land on the live tip.
All downstream callers of list_sessions_rich benefit automatically:
- cli.py _list_recent_sessions (/resume, show_history affordance)
- hermes_cli/main.py sessions list / sessions browse
- tui_gateway session.list picker
- gateway/run.py /resume titled session listing
- tools/session_search_tool.py
- acp_adapter/session.py
Tests: 7 new in TestCompressionChainProjection covering full-chain walks,
delegate-child exclusion, tip surfacing with lineage tracking, raw-root
mode, chronological ordering, and broken-chain graceful fallback.
Verified live: ran a real _compress_context on a live Gemini-backed
session, confirmed the DB split, then verified
- db.list_sessions_rich surfaces tip with _lineage_root_id set
- hermes sessions list shows the tip, not the ended parent
- _resolve_session_by_name_or_id(old_root_id) -> tip_id
- _resolve_last_session -> tip_id
Addresses #10373.
22efc81cd7