Conciseness

Mostly efficient with no explanations of concepts Claude already knows, but the 23-line ASCII box diagram restating the preservation hierarchy as a compact bullet list, and the Token Budgets table duplicated verbatim in references/COMPACTION-STRATEGY.md, are padding that could be tightened. Not 4 because the duplication and the box-art represent more than minor over-explanation.

Actionability

The Quick Start code is executable and its API (should_compact(context, limit=100000), compact(context)) matches scripts/compactor.py, and all four listed scripts exist. Minor gaps keep it from 5: the example doesn't show how to consume the result (compacted.messages / reduction_percentage), and 'from scripts.compactor import' assumes a package layout with no __init__.py present.

Workflow Clarity

The Compaction Process lists a clear five-step sequence including a 'Validate' step, but validation is vague ('Ensure compacted context is coherent') with no method and no feedback loop for what to do if coherence fails. This matches the 3 anchor 'sequence present but checkpoints missing or implicit' rather than 4's 'most checkpoints present with minor gaps'.

Progressive Disclosure

Structure is good (overview sections plus one-level-deep References and Scripts listings), but scoring against the actual bundle reveals defects: references/TOKEN-BUDGETS.md is referenced yet does not exist (broken navigation), and the body inlines the preservation hierarchy and token-budget table that duplicate references/COMPACTION-STRATEGY.md — content that should live in the separate file. This fits the 3 anchor rather than 4's 'minor organization gaps'.

Specificity

The description names the domain ('Automatic context summarization for long-running sessions') and one core action (summarization), but does not enumerate the concrete operations the skill performs (scoring message importance, compacting, discarding stale content). It matches 'names domain and 1-2 concrete actions, but not comprehensive' rather than 4, which requires several specific actions listed.

Completeness

It explicitly answers both: what ('Automatic context summarization for long-running sessions') and when ('Use when context is approaching limits, summarizing completed work, preserving critical information, or managing token budgets') with four concrete trigger phrases. The 'when' is explicit and specific, matching the 5 anchor rather than 4 where the trigger guidance could be more explicit.

Trigger Term Quality

Triggers like 'context is approaching limits', 'summarizing completed work', and 'managing token budgets' are phrases a user would naturally say. It falls short of 5 because common synonyms such as 'context window', 'compact the conversation', or 'running out of context' are missing.

Distinctiveness Conflict Risk

The context-limit/token-budget niche is mostly distinct from other skills, but 'summarizing completed work' and 'preserving critical information' could plausibly trigger a general memory or summarization skill, giving minor overlap risk consistent with the 4 anchor rather than 5's 'minimal conflict risk'.