Conciseness

The operational core (dispatch table, quick usage, export shortcuts) is tight and assumption-respecting, but several sections pad the file with feature documentation Claude doesn't need to invoke the script — e.g. the HTML drawer's "Close with the × button, Esc, or a backdrop click — focus returns to the originating row" and the subagent-attribution internals ("iterative resolve over (tool_use.id, agentId) linkage ... with a cycle guard"). Inline version markers ("v1.6.0", "v1.87.0", "v1.78.0+") are time-sensitive information placed outside any deprecated/changelog section, which the rubric explicitly penalizes. This lands above anchor 2 (the majority is operationally useful, not padded throughout) but below anchor 4 because multiple sections need trimming or deferral.

Actionability

Fully executable, copy-paste-ready commands throughout: `uv run python ${CLAUDE_SKILL_DIR}/scripts/session-metrics.py --session ${CLAUDE_SESSION_ID}` with every flag documented in tables, plus an export-shortcut table mapping each concrete argument string ("export project sessions to html") to the exact command (`--project-cost --quiet --output html json`). The common cases are all covered by specific examples.

Workflow Clarity

Multi-step flows are explicitly sequenced with validation checkpoints and gates: dispatch by literal equality with a defined fallback; export-scope checks as an ordered first-match-wins list; the Tasks and Insights companions as numbered prepare → edit → render flows where the render step "validates the prose ... never trusted for math"; and the one destructive operation (--prune-exports) is documented as dry-run-by-default with an explicit --yes opt-in. The "editor, not an author" contract and scope gates ("Never auto-generate for --project-cost or --all-projects") are unambiguous.

Progressive Disclosure

Good structure against the actual bundle: compare mode, instance dashboard, pricing, JSONL schema, and post-export audit are each deferred to real one-level-deep reference files with explicit "read X when Y" signals and stated deferral rationale ("so single-session reports don't pay for compare-mode context"), and all referenced paths exist. It falls short of anchor 5 because a substantial amount of feature detail is still inlined in SKILL.md — the per-turn HTML drill-down UI behavior, the cross-cutting sections, and the subagent-attribution internals — which could live in the existing references, making the overview heavier than a pure routing document.

Specificity

Concrete actions are named — "Tally Claude Code session token usage and cost estimates from the raw JSONL conversation log" plus "breakdown of how much a Claude Code session has cost" and "per-turn metrics" — giving several specific capabilities with only minor gaps (export formats and the comparison mode are not named in the what-clause). It stops short of anchor 5's comprehensive coverage because the capability list omits the multi-format export and project/instance aggregation the skill actually performs.

Completeness

Explicitly answers both questions: what ("Tally ... token usage and cost estimates from the raw JSONL conversation log") and when ("Trigger when the user asks about ..." followed by concrete trigger phrases). The negative guidance about compare-mode dispatch adds routing precision without diluting either clause.

Trigger Term Quality

Covers natural terms and their synonyms comprehensively: "session cost", "token usage", "API spend", "cache hit rate", "input/output tokens", plus quoted user phrasings like "how much have we spent", "show me token usage", "session summary", and "cost so far". This matches the anchor-5 pattern of including the actual phrases a user would say, not just technical jargon.

Distinctiveness Conflict Risk

Occupies a clear niche — Claude Code session cost/token analysis from the JSONL log — with trigger terms (session cost, cache hit rate, per-turn metrics) that no generic analytics or code-metrics skill would claim. The explicit do-not-trigger boundary for compare mode further reduces mis-dispatch risk.