Conciseness

The body is dense and sbx-specific with essentially no explanation of concepts Claude already knows, but version-gated claims appear inline throughout ("Before 0.37.1", "0.37.1 (2026-07-29) turned this off by default", "From 0.38.0") and a few passages ("Same protocol, opposite purpose — don't let the shared vocabulary conflate them") could be tightened, fitting the efficient-with-minor-trimmings anchor at 4 rather than every-token-earns-its-place at 5.

Actionability

Guidance is copy-paste ready: `sbx setup ssh`, `sbx create --name demo shell .`, `ssh demo.sbx`, `sbx run --name <sandbox-name>`, `where.exe sh`, exact settings like `"remote.SSH.useLocalServer": false`, and a symptom-to-workaround table keyed on exact error strings — fully executable coverage of the common cases.

Workflow Clarity

The sequence is explicit with a validation checkpoint ("confirm `ssh <name>.sbx` works from a terminal first, then add the host inside the app's own remote/SSH UI") and a feedback loop via the known-bugs workaround table; no destructive or batch operations are involved, so no cap applies.

Progressive Disclosure

Sections are clearly organized and cross-skill routing (`running-sbx-sandboxes`, `diagnosing-sbx-sandboxes`) is one level deep, but at ~150 lines the per-app connection notes and bug table are inlined in SKILL.md with no bundle split, fitting the good-structure-with-minor-gaps anchor at 4 rather than the well-signaled-reference split at 5.

Specificity

The description lists multiple concrete actions — "Point an external editor or app... over SSH via the `<name>.sbx` hostname", "setting up `sbx setup ssh`", "wiring a remote-SSH connection", "hitting a stalled or looping connection", "deciding whether Claude Desktop's credential-isolation warning applies" — with named tools (VS Code, Cursor, Claude Desktop, ChatGPT) and no coverage gaps, matching the comprehensive-action anchor rather than the minor-gaps anchor at 4.

Completeness

It explicitly answers both what ("Point an external editor or app... at a running Docker Sandbox over SSH via the `<name>.sbx` hostname") and when ("Use when setting up `sbx setup ssh`, wiring a remote-SSH connection..., hitting a stalled or looping connection, or deciding whether Claude Desktop's credential-isolation warning applies"), matching the explicit what-and-when anchor at 5.

Trigger Term Quality

Natural trigger phrases are strong — app names, "SSH", "remote-SSH connection", "stalled or looping connection" — but a few phrasings a user might naturally say (e.g. "connect to sandbox", "remote development") are missing, fitting the good-coverage-with-a-few-gaps anchor at 4 rather than comprehensive synonym coverage at 5.

Distinctiveness Conflict Risk

It carves a clear niche — connecting external editors to Docker sbx sandboxes over the `<name>.sbx` SSH hostname — with triggers tied to `sbx setup ssh` and specific apps, so it is unlikely to fire for unrelated SSH or sandbox skills; fits the clear-niche anchor at 5.