Conciseness

Nearly every sentence carries non-obvious, codebase-specific load ("Treat it as a materialized query result, not a live connection state machine"), with no concept-introduction padding. Not 5: Gotcha 8 re-explains generic SQL name-resolution scoping Claude already knows, and Gotchas 6 and 8 are run-on paragraphs that could be tightened.

Actionability

As an instruction-only skill it is fully actionable: exact directives with named functions and files ("To close a session, insert the right Events row — never mutate Sessions directly", "reject a bare mac_column outright", "don't design around these tables ever becoming devGUID-keyed"). Per the code-vs-instruction scoring note, absence of code is not penalized when guidance is this concrete.

Workflow Clarity

The 14-step process_scan() call order is explicitly sequenced with per-step rationale and ordering constraints ("step 2 reads this as 'previous' on the next cycle"), plus validation directives ("Check any new query here with EXPLAIN QUERY PLAN at a realistic row count", CI drift-guard test). Not 5: no fix-and-retry feedback loop ties the checkpoints into an error-recovery path.

Progressive Disclosure

Good structure: a Scope section, well-labeled sections, and explicit cross-navigation to sibling skills ("database-patterns", "plugin-development") one level deep. Not 5: the body exceeds 50 lines with some gotcha detail (6 and 8) that could live in a reference file, and the Gotchas list has a numbering defect — two items numbered "7", the second appearing out of order after "8".

Specificity

The description lists four concrete, named coverage areas: "process_scan() call order and why it's load-bearing, CurrentScan/Events/Sessions/DevicesView relationships, the Events-to-Sessions pairing mechanism, and the FIELD_SPECS field-write authority system" — comprehensive and specific. Anchor 4 ("minor gaps in coverage") fits less well since no listed area is vague or missing.

Completeness

Both what and when are explicit and concrete: the four-part what list plus "Use this when modifying server/scan/session_events.py or server/scan/device_handling.py, or reasoning about device presence..." matches the anchor-5 pattern exactly. Not 4, since the when-clause is neither implicit nor underspecified.

Trigger Term Quality

Good keyword coverage including the two concrete file paths ("server/scan/session_events.py", "server/scan/device_handling.py") and natural phrases ("device presence, connect/disconnect events, or session timelines"). Not 5: common variations a user might say — "device down", "online/offline", "NIC", or bare table names like `Devices` — are absent.

Distinctiveness Conflict Risk

The niche is clearly delimited (named app, two named source files), but "FIELD_SPECS field-write authority system" and "reasoning about device presence" overlap the companion `database-patterns` skill's domain — the body itself calls FIELD_SPECS "the scan-pipeline-local half" of that system. Minor overlap risk with a closely related skill → anchor 4, not 5.