Conciseness

The body is mostly efficient — no padding explaining known concepts, concrete behavior in a few sentences — but the `sceneRef` input is documented three times (the '## Inputs' bullet, the '## Input' table, and the full JSON schema), the '## Output' header is empty (behavior is described elsewhere), and the generic stdin heredoc ('{"param": "value"}') is boilerplate. This fits 'mostly efficient but includes some unnecessary explanation or could be tightened'; it is above the 2 anchor since there is no concept over-explanation, and below 4 because the duplication is a real tightening opportunity.

Actionability

Concrete, executable commands are given ('unity-mcp-cli run-tool scene-set-active --input ...'), plus real troubleshooting alternatives ('npm install -g unity-mcp-cli' / 'npx unity-mcp-cli') and an --input-file/stdin pattern. However the examples are placeholders — '"sceneRef": "string_value"' contradicts the schema (sceneRef is an AssetObjectRef object, not a string) and the stdin example uses '{"param": "value"}' rather than the actual parameter — so it sits at 'mostly executable guidance with minor gaps' rather than the fully copy-paste-ready 5, and clearly above the pseudocode-level 3.

Workflow Clarity

For a single-action tool the sequence is clear: use 'scene-list-opened' to enumerate opened scenes, call scene-set-active, and the tool 'Returns the post-call snapshot of opened scenes' as feedback. Minor validation gaps remain — no guidance on what to do if the scene is not opened or sceneRef fails to resolve (troubleshooting only covers a missing CLI). This matches 'clear sequence with most checkpoints present; minor validation gaps'; not a 5 for the missing error-recovery loop, not a 3 since the sequence is unambiguous and the no-op-if-active behavior is stated.

Progressive Disclosure

Section headers are present and labeled (Inputs, Behavior, How to Call, Troubleshooting, Input/Output JSON Schema), but roughly 110 of ~165 lines are inline JSON schema reference material, the input spec is duplicated across two sections with inconsistent types ('AssetObjectRef pointing at a SceneAsset' vs table type 'any' describing 'Material, ScriptableObject, Prefab'), and there are no bundle files to offload detail into. This fits 'some structure but could be better organized; content that should be separate is inline'; it is above the 2 anchor (headers exist and nothing is buried) but below 4 given the duplication and schema bulk in the main file.

Specificity

The description names the domain (Unity Editor scenes) and one concrete action — 'Mark an opened scene as the Editor's active scene' — with a useful parenthetical on consequences ('the one new GameObjects are added to and that's used as the default for many operations'), but lists only a single action, matching the '1-2 concrete actions, not comprehensive' anchor. Not a 4 because it does not enumerate several specific actions; not a 2 because the action and domain are concrete, not generic.

Completeness

The 'what' is clear ('Mark an opened scene as the Editor's active scene'), but there is no explicit 'Use when...' trigger clause; the second sentence ('Use scene-list-opened to enumerate opened scenes first') is a prerequisite workflow pointer, not usage guidance. Per the judging guidelines a missing 'Use when...' clause caps completeness at 3 ('clear what, when missing or only weakly implied'), and it is not a 2 since the 'what' is fully explicit.

Trigger Term Quality

Natural Unity vocabulary is present — 'scene', 'active scene', 'opened scene', 'GameObjects', 'Editor' — which a user asking to set the active scene would plausibly say. A few natural terms are missing (e.g., '.unity' scene files, 'load'/'switch' synonyms), so it fits 'good keyword coverage; a few natural terms missing' rather than the comprehensive synonym-level 5 anchor, and clearly above the 3 anchor's 'missing common variations' since multiple distinct natural phrasings are covered.

Distinctiveness Conflict Risk

'Mark an opened scene as the Editor's active scene' carves a clear niche distinct from sibling scene tools (listing, opening, closing), and 'scene-list-opened' is named for the companion step, so conflict risk is low. It is not a 5 because the description leans on related scene vocabulary that overlaps with other scene-management skills and provides no distinct trigger phrase to disambiguate; not a 3 since the core action is unmistakable.