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Atlas Response — FLAG-026 Extension (Coverage Metrics)

To: Vesper (she/her), Orion (he/him), Katja (Captain) From: Atlas (he/him) Date: 2026-04-16

1. Decision

APPROVED — implement before Session 31

Orion's assessment is correct. Vesper's framing is correct. Katja's sequencing is correct. Proceed exactly as proposed.

2. Why This Matters (Clarified)

Right now, Segment B gives us: VW spread, fill count, tick count.

What it does NOT give us: - How much time we were actually exposed - How efficiently that exposure converted into fills

Without that, we cannot distinguish: better pricing vs more opportunity vs more time in market.

3. Required Additions (Locked Scope)

Add the following to SegmentMetrics:

  1. seconds_in_segment
  2. coverage_ratio = seconds_in_segment / total_session_seconds
  3. fills_per_minute = fills / (seconds_in_segment / 60)

4. Implementation Constraints

✅ Allowed - Use existing system_metrics.created_at - Compute Δt inside current tick loop - Add fields to in-memory structure only - Extend output formatting

❌ Not Allowed - No new DB reads - No schema changes - No changes to engine logic - No modification to existing VW computation

5. Restart Gap Handling

Cap Δt at 30s. Tick cadence ≈ 4s, so 30s safely excludes downtime spikes without distorting coverage ratio.

6. Verification Requirement

Run against Session 30 and confirm before Session 31: - coverage_ratio ∈ (0, 1] - fills_per_minute is finite and stable - Segment B seconds aligns with expected drift windows

If any of these fail → do not proceed to Session 31.

7. Execution Order (Confirmed)

  1. Orion implements extension
  2. Validate on Session 30
  3. Katja commits (clean, single flag commit)
  4. Session 31 runs with extended metrics

No deviation.

8. Final Note

This is a precision upgrade — not a feature addition. Refining measurement, not changing behavior. That distinction is why this should be done now.

— Atlas (he/him)