diff --git a/benchmark/runtime/session_observation.py b/benchmark/runtime/session_observation.py
index 023240ad6d..b1dd0b3a1c 100644
--- a/benchmark/runtime/session_observation.py
+++ b/benchmark/runtime/session_observation.py
@@ -1,8 +1,12 @@
 """Content-free, bounded observations from a live Codex session rollout.
 
-This is an operational signal for liveness and capacity control.  Exact usage
-accounting still uses the complete streaming reader owned by
-``loopx.control_plane.quota.codex_session_usage``.
+This is an operational signal for liveness and capacity control.
+``usage_cumulative`` retains the native ``token_count`` basis, which may exclude
+compaction. Goal usage collection uses the complete streaming reader in
+``loopx.control_plane.quota.codex_session_usage`` with that same counter basis.
+For recorded request/compaction coverage, use the benchmark-toolkit trajectory
+capture's ``request_coverage`` projection. Session counters and reconciled
+all-request totals are separate observations, not additive charges.
 """
 
 from __future__ import annotations
diff --git a/skills/loopx-benchmark/SKILL.md b/skills/loopx-benchmark/SKILL.md
index 07db8a72c3..3d146d4943 100644
--- a/skills/loopx-benchmark/SKILL.md
+++ b/skills/loopx-benchmark/SKILL.md
@@ -125,6 +125,18 @@ separate: fewer bytes, calls or tokens are not proof of a better task outcome.
    analysis. Do not substitute profiler hotspots for outcome evidence or require
    profiling to inspect duplicate content and unnecessary interactions.
 
+For recorded model-request totals, use `loopx benchmark trajectory-pack-register`
+with `--usage-jsonl` and `--usage-session-id`, then read
+`solver_usage.projection.request_coverage`. Registration does not run an analyzer;
+an unfinished final Turn requires the explicit `--include-incomplete-usage`
+option. Live-tail `usage_cumulative` and `token_count` observations retain the
+native session-counter basis, which may exclude compaction. Only verified
+`request_coverage.all_requests` supplies the reconciled recorded-request total;
+retain its `counter_basis`, capture window and limitations. Compaction is a
+subset and its mirrored record is not another request. Do not add either to
+the session totals. Missing or unavailable coverage remains unknown. This
+source selection does not rewrite Goal accounting or establish billing coverage.
+
 ## Experiment sequence
 
 1. **Read the experiment board before launching or selecting a case.**