The body is lean and assumes Claude's competence: a compact quick-reference table, a copy-paste script template, and short tips, with no padding explaining what bash, jq, or status lines are.

It provides fully executable guidance: a complete settings.json snippet, a working bash script template using jq/tput, the chmod command, and a concrete mock-JSON test command — all copy-paste ready.

Although this is a single-task skill, the sequence is unambiguous (configure settings.json → write/chmod script → test with mock JSON), and it appropriately notes the no-restart validation behavior. For a simple skill this clear workflow earns full marks.

The body is a concise overview with well-signaled one-level-deep references to real files (json-schema.md plus four example files, all verified to exist in ./references), with detailed schemas and examples correctly deferred to those files.

The description lists multiple concrete actions and outputs — 'display git branch, context usage, model name, or session costs at the bottom of Claude Code' — naming specific deliverables rather than vague capabilities.

It explicitly answers 'what' (create custom status lines showing contextual info at the bottom of Claude Code) and 'when' ('should be used when the user asks...' / 'Also suggest when...'), giving both explicit trigger guidance.

It includes natural phrasings users would actually say ('create a statusline', 'customize the status line', 'add a custom prompt') plus concrete feature terms (git branch, context usage, model name, session costs).

The Claude Code statusline niche is narrow with distinctive triggers ('statusline', 'status line', 'custom prompt' at the bottom of Claude Code), making conflicts with other skills unlikely.