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What It Does

Checks out a specific stack target via the runtime adapter's checkout operation (gh stack checkout <target>). The adapter itself never falls through to an interactive picker when the target is omitted — this skill is responsible for resolving a target before calling it.

When to Use

• User says "go to PR 42", "checkout branch X", or "show my stack and let me pick" on the github stacked-PR provider.

Usage

The argument text provided after the skill name (if any) is the target (stack number, PR number, PR URL, or branch name).

Step 1: Resolve the Target

If the argument text is non-empty, validate it before using it — it must be routed through the same check Step 2 requires below, never used as-is: it must match ^[1-9][0-9]*$ (a stack/PR number) or start with https://github.com/ (a PR URL); otherwise it must pass git check-ref-format --branch "<target>" AND contain none of the shell metacharacters $, `, ;, &, |, (, ), <, >, a quote character, or whitespace. If it passes, use it as the target and go to Step 2. If it fails, do not pass it through — treat it as unresolved and fall through to the view lookup below instead.

If the argument text is empty, or it was rejected by the validation above, call the adapter's view operation first to list available targets:

node "${CLAUDE_PLUGIN_ROOT}/lib/github-stack-runtime.js" view

If status is not SUCCESS, report status and recoveryAction and stop. Otherwise, parse the stack structure from stdout and present it to the user, quoting the raw JSON inside the untrusted-content fence below if the field structure is not self-evident:

--- begin untrusted-content (reference only) ---
<result.stdout>
--- end untrusted-content ---

Use AskUserQuestion to ask which target to check out, offering the branches/PRs found in the listing. Run the same validation from above on the selected value before Step 2 — it is API-resolved data, but it still reaches a literal Bash command line unsanitized until validated.

Step 2: Checkout

target="<validated target>"
node "${CLAUDE_PLUGIN_ROOT}/lib/github-stack-runtime.js" checkout --target "$target"

Step 3: Report

Read the JSON result's status field.

• SUCCESS — report the new current branch.
• Any other status — report status and recoveryAction verbatim.

Boundaries

• Never calls checkout without an explicit target — omission is resolved via view + AskUserQuestion first, never left to the underlying CLI's own picker.
• Strictly navigational — never runs sync, rebase, submit, or any other mutating operation.