Conciseness

Dense, project-specific content with no padding and no explanation of concepts Claude already knows (Rust testing, cargo, insta are assumed). Minor trimmable redundancy — the Quick Reference table overlaps the insta category table, and the compiletest-guide link appears both inline and again in the References section — keeps it at anchor 4 rather than 5.

Actionability

Fully executable throughout: copy-paste commands ("cargo run -p hashql-compiletest run --bless", "cargo nextest run --package hashql-<package>", "cargo insta test --package hashql-<package>"), real file paths, and complete working examples (annotated test file, snapshot settings code, the body! macro example) all cited to actual repo locations, covering the common cases.

Workflow Clarity

The decision workflow is clearly routed via the Quick Reference table, the "compiletest is the default" statement, insta's "when compiletest (the preferred method) is infeasible", explicit MIR-builder "when to use" bullets, and an explicit escalation instruction ("do not work around it manually - instead, stop and request that the feature be added"). Falls short of anchor 5 because the run -> bless loop lacks an explicit validation checkpoint (e.g., reviewing the updated expectations before accepting).

Progressive Disclosure

Clear overview with well-signaled, one-level-deep references: inline guide links plus a consolidated References section, and all four referenced files (compiletest-guide.md, mir-builder-guide.md, testing-strategies.md, mir-fluent-builder.md) exist in ./references/ with detail appropriately split out of the body.

Specificity

Names the domain plus three concrete test approaches ("compiletest (UI tests), unit tests, and snapshot tests") and concrete tasks ("using //~ annotations, running --bless, debugging test failures"), but the "strategies including..." framing names categories rather than action verbs, so it falls between the several-actions (4) and comprehensive-actions (5) anchors.

Completeness

Explicitly answers both: a concrete "what" (three named testing approaches with parenthetical clarifications) and an explicit "when" with five concrete trigger phrases ("Use when writing tests for HashQL code, using //~ annotations, running --bless, debugging test failures, or choosing the right testing approach"), matching the anchor-5 exemplar structure.

Trigger Term Quality

Natural phrases like "writing tests", "unit tests", "snapshot tests", and "debugging test failures" plus tool-specific triggers (//~, --bless) that users in this repo would say. A few natural synonyms are missing (e.g., "insta", "bless tests", "integration tests"), short of anchor 5's comprehensive coverage.

Distinctiveness Conflict Risk

Anchored to a specific project ("HashQL") with tool-specific triggers (compiletest, //~ annotations, --bless), giving a clear niche with minimal conflict risk against generic testing skills.