Conciseness

The body is lean and assumes competence — no concept explanations, and environment-specific facts ("Most devices are pre-opened. Do not use open or close...") earn their tokens. Not level 5 because the Key Actions table restates commands already given step-by-step in Core Workflow (`look at`, `activate`, `deactivate`), and the Purpose section re-summarizes the frontmatter description.

Actionability

Fully executable, copy-paste-ready commands (`look at <DEVICE_NAME>`, `activate <DEVICE_NAME>`, `use thermometer on <MATERIAL>`) plus a complete worked example with the exact observation strings to expect ("which is turned on", "a substance called liquid lead") — matching the level-5 anchor of executable commands with a specific example covering the common case.

Workflow Clarity

The 6-step Core Workflow has a clear sequence and explicit verification checkpoints (verify contents, confirm "turned off" state, confirm "turned on" after activation), matching "clear sequence with most checkpoints present". Not level 5 because there is no error-recovery feedback loop — "Always verify activation succeeded before proceeding" says what to check but not what to do if activation fails (e.g., retry, re-check contents, report).

Progressive Disclosure

The body itself is well organized into Purpose/Workflow/Key Actions/Example/Notes, but the bundle's actual structure includes references/device_specifications.md (per-device temperatures, safety protocols, exact confirmation outputs) that is never mentioned or linked anywhere in the body — references present in the bundle but not signaled at all. The under-50-line exception does not apply because there is a real reference file with complementary detail the body omits; a one-line pointer would lift this to 4-5.

Specificity

"Activates a device (e.g., blast furnace, stove) to initiate a process like heating" names the domain and 1-2 concrete actions, matching the level-3 anchor ("Processes PDF files and extracts content"), but the guideline-mandated 1-point penalty applies for the second-person phrasing "when you have placed materials inside a device". The trailing clause "enabling tasks that require energy input or material processing to progress" is abstract padding rather than additional concrete actions.

Completeness

Both what ("Activates a device... to initiate a process like heating", plus I/O: "Takes a device name as input and outputs a confirmation of activation") and when ("Use this skill when you have placed materials inside a device and need to start its operation") are explicit and concrete; the when-clause is more specific than the level-4 anchor example ("Use when working with PDF files"), matching the level-5 anchor's explicit what+when with concrete triggers.

Trigger Term Quality

Good natural-term coverage: "activate", "start its operation", "heating", "blast furnace", "stove", "material processing", "placed materials inside a device" — comparable to the level-4 example ("PDF files, forms, document extraction"). Not level 5 because common synonyms users would say — "turn on", "light", "heat up", "melt", "cook" — are absent.

Distinctiveness Conflict Risk

A fairly clear niche — device activation after loading materials, with named devices ("blast furnace, stove") — sits at "mostly distinct; minor overlap risk with closely related skills". Not level 5 because sibling skills in the same environment (opening devices, placing materials, using measurement tools) share the device-manipulation vocabulary and could overlap on triggers like "device" or "start".