Conciseness

The MCP tool argument tables and invocation gotchas are genuinely new information Claude would not know, but the same tool flow is narrated three times (High Level Workflow, the '1./2.' connection-mode subsections, and both example workflows) and several sentences are wordy ('If Atlas MCP Server for Atlas is not configured or you don't have enough information…'), so it is mostly efficient but could be tightened. Not 2: there is no padding with concepts Claude already knows; not 4: the cross-section repetition is noticeable rather than minor.

Actionability

Exact MCP tool names with copy-paste-ready JSON argument objects (e.g. the full explain method/verbosity shape and atlas-get-performance-advisor required/optional fields), plus two worked examples with real filters, explain results, selectivity math, and a concrete ESR-based compound index recommendation — specific examples cover both common cases (specific query, general cluster performance).

Workflow Clarity

Clear sequences with explicit conditional branching ('If MCP db connection is configured… run steps 1–3. Otherwise skip to step 4') and a checkpoint (run explain in queryPlanner first to check for COLLSCAN, then executionStats only if needed). Not 5: there is no post-change verification loop (e.g. re-running explain after index creation) and Example workflow 1 step 2 ambiguously says 'verbosity=queryPlanner and executionStats'; not 3: checkpoints are present and explicit, and index creation is gated on user approval so no destructive-operation cap applies.

Progressive Disclosure

The body is a workflow overview with a 'Load references' section that clearly signals one-level-deep files — always load core-indexing-principles.md and antipattern-examples.md, conditionally load aggregation-optimization.md and update-query-examples.md with explicit 'If diagnosing X → load Y' conditions — and all four referenced files exist in the bundle. The inline MCP tool table is per-invocation operational detail that appropriately stays in the overview.

Specificity

Names the domain and several concrete actions — 'query optimization and indexing', 'Prefer indexing as optimization strategy', 'Use MongoDB MCP' — but 'Help with' is generic and coverage has minor gaps (no mention of explain-plan analysis or aggregation tuning), matching the 'several specific actions with minor gaps' anchor rather than comprehensive coverage.

Completeness

Explicitly answers both 'what' ('Help with MongoDB query optimization and indexing') and 'when' ('Use only when the user asks for optimization or performance') with concrete quoted trigger phrases and a negative boundary ('Do not invoke for general MongoDB query writing'), matching the top anchor; score 4 would require the 'when' to be less explicit, which it is not.

Trigger Term Quality

Includes multiple natural user utterances ('How do I optimize this query?', 'Why is this query slow?', 'Can you fix my slow queries?', 'What are the slow queries on my cluster?') plus keywords 'optimization', 'performance', 'index', but misses common synonyms such as 'speed up' or 'make my query faster', fitting 'good keyword coverage; a few natural terms missing'.

Distinctiveness Conflict Risk

Clear niche (MongoDB performance/indexing) with distinct trigger phrases, and the exclusion clause 'Do not invoke for general MongoDB query writing unless user asks for performance or index help' explicitly disambiguates it from a general MongoDB query-writing skill, giving minimal conflict risk.