Conciseness

Every section carries non-obvious, tool-specific knowledge Claude cannot already have (TTY/PTY branching, stack orientation semantics, the exit-code table, worktree catalog behavior), with no padding and no explanation of general git/GitHub concepts. Even dense passages like "parse only successful path-mode stdout, never status messages" earn their tokens, matching the level-5 'every token earns its place' anchor rather than level 4's 'minor instances of over-explanation'.

Actionability

The body is dominated by copy-paste-ready invocations with the exact safe flags: "gh stack submit --auto", "gh stack merge 42 --yes --squash", "gh stack rebase --upstack", a complete core loop, and an 'Always run / Never run bare' table with reasons. This exceeds the level-4 anchor (concrete commands with minor gaps) and matches level 5: specific examples cover the common cases, with only inherent placeholders like "git add ..." whose content is user work.

Workflow Clarity

Sequences are explicit and validated: the core loop ends with "gh stack view --json # confirm", the edit workflow validates ownership first ("Run gh stack view --json; if ownership is unclear, inspect git log --all -- <path>"), and the exit-code table plus the Exit 3 recovery procedure (resolve → git add → rebase --continue, or --abort) form an explicit feedback loop and error-recovery checklist. This matches the level-5 anchor; level 4 ('minor validation gaps') would understate the recovery coverage.

Progressive Disclosure

The body stays a focused overview and defers detail to three real, verified, one-level-deep reference files, each given an explicit trigger in 'More detail' ("read before creating a stack", "read when a command fails unexpectedly", "read on a rebase conflict"), plus "Open the reference whose trigger matches the task; no need to preload all three." This is the level-5 anchor (clear overview, well-signaled one-level-deep references) exactly; no nested references exist in the bundle.

Specificity

"Manages stacked PRs and splits multi-part work into reviewable branches" plus the enumerated operations "stack creation, viewing, edits, push, submit, sync, rebase, merge, or checkout" list nine concrete, tool-verifiable actions covering the CLI's full surface. This matches the level-5 anchor (multiple specific concrete actions, comprehensive coverage) rather than level 4, which reserves minor gaps in coverage.

Completeness

The 'what' is explicit ("Manages stacked PRs and splits multi-part work into reviewable branches with gh-stack") and the 'when' is an explicit "Use for ... whenever a user mentions ... or when a stack is checked out" clause with concrete trigger phrases. Both halves are clearly and explicitly answered, matching the level-5 anchor exactly.

Trigger Term Quality

"a stack, branch layers, dependent PRs, or gh stack" and "split or isolate work for review" cover the natural synonyms a user would actually say, including the literal command name. Coverage is comprehensive for this domain (there is no file extension to include), so it fits the level-5 anchor better than level 4's 'a few natural terms missing'.

Distinctiveness Conflict Risk

The description is anchored to a specific niche tool (gh-stack, stacked/dependent PRs) with distinct triggers like "branch layers" and "gh stack" that no generic git-branching skill would claim, giving minimal conflict risk — the level-5 anchor. It is well above level 4's 'minor overlap risk with closely related skills'.