how
How
A skill named in bold or in backticks, or run as /<name>, is the file ../<name>/SKILL.md beside this skill's directory, and a principle named without its prefix is ../principle-<name>/SKILL.md. Read the file and follow it. Most pstack skills are user-only, so your skill tool cannot load them. Every subagent is a Rex worker pane: spawn, wait and close it per ../rex-subagents/SKILL.md, with the defaults in the Subagents section of ../poteto-mode/SKILL.md.
Explore the codebase to answer "how does X work?" questions. Produce architectural explanations at the level of a senior engineer onboarding onto a subsystem, enough to build a working mental model, not so much that it reads like annotated source code.
Every spawn is a worker with --read-only and a plain brief: the filled prompt template. Explorers are named how explorer <angle> and use the how explorer line in ~/.config/pstack/pstack-models.md, and every explainer is named how explainer and uses the how explainer line. Pass the entry to subagent spawn --entry as written. When the value is auto or inherit-parent, or the file or the line is missing, run the worker on your own harness and its default model. With no file, say so and suggest /setup-pstack. If a worker's model is rejected, run it on that harness's default model and say so. Pick each subagent's reasoning level and fast or standard speed for the job, per the Subagents section of the poteto-mode skill. End the turn after spawning and let the wake-up lines start your next turns.
1. Assess complexity
If the scope is ambiguous, state your interpretation and explore. The user can redirect.
- Simple (a single module, a small utility, a narrow question such as "how does function X work"): no explorers. Spawn one explainer that explores and explains in one pass, built from
references/explainer-prompt.mdwithout the explorer-findings section. Go to step 4. - Complex (a subsystem spanning multiple files or services, a cross-cutting feature, a full architectural overview): go to step 2.
When in doubt, take the simple path.