Conciseness

The body is dense with non-obvious expert guidance and assumes competence (no padding about what Terraform or Go is), but the opening paragraph restates the description and a few passages (e.g. the mux preamble) could be trimmed. This matches the score-4 anchor (efficient, minor over-explanation) rather than 5, where every token would earn its place.

Actionability

Concrete and mostly executable: a copy-paste-ready mux `main.go`, exact test names (`_basic` with `ImportStateVerify: true`, `_disappears`), and exact API names (`tf5to6server`, `ExternalProviders`, `ProtoV6ProviderFactories`, `ConfigPlanChecks`). It falls short of the score-5 anchor because the two-step empty-plan test pattern and the `StateUpgrader` mechanism are described in prose without a code example.

Workflow Clarity

A clear five-step sequence (decide → mux → baseline → port → move registration → verify) with explicit validation checkpoints for a risky operation: pre-existing tests "must pass **unchanged**", the empty-plan assertion ("the plan must be empty"), and "`terraform plan` against a real pre-migration state file shows no diff", plus a closing checklist. Matches the score-5 anchor; not 4 because no validation gaps remain.

Progressive Disclosure

The single reference (`references/schema-mapping.md`, verified to exist with real translation-table content) is one level deep and clearly signaled twice — under "**Reference** (load when needed)" and at its point of use in Step 3. Structure matches the score-5 anchor: clear overview, well-signaled reference, easy navigation; the inline main.go is appropriate as the core of Step 1 rather than misplaced reference content.

Specificity

The description enumerates multiple concrete, named capabilities — "muxing both plugins in one provider (terraform-plugin-mux, tf5to6server)", "schema mapping (ForceNew, ValidateFunc, DiffSuppressFunc, Default, Timeouts, blocks)", "state-compatibility verification" — with comprehensive coverage. It matches the score-5 anchor (multiple specific concrete actions) rather than 4, because no meaningful capability area is missing.

Completeness

The 'what' is fully enumerated (mux setup, per-resource workflow, schema mapping, behavioral traps, state verification) and an explicit "Use when..." clause lists four concrete trigger scenarios. This matches the score-5 anchor exactly and clearly exceeds the score-4 anchor's 'when could be more explicit'.

Trigger Term Quality

It combines natural user phrasings ("converting or translating SDKv2 resources", "setting up a muxed provider server", "debugging plan diffs and state errors") with the exact technical vocabulary of the domain. This matches the score-5 anchor (comprehensive coverage including synonyms) rather than 4, since both colloquial variations and specific jargon are present.

Distinctiveness Conflict Risk

The tightly-scoped niche ("from Plugin SDKv2 to the Plugin Framework") with migration-specific triggers makes confusion with general Terraform or provider-development skills unlikely. Matches the score-5 anchor (clear niche with distinct triggers, minimal conflict risk); it is not 4 because no overlap risk with a closely related skill is apparent.