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why

Use for 'why does X work this way', 'why we picked Y', design rationale, regressions, postmortems, or data-backed thresholds. Discovers available MCPs and queries each evidence category (source control, issue tracker, long-form docs, real-time chat, infrastructure observability, error tracking, product analytics warehouse) in parallel, then returns a cited read on decisions and tradeoffs. Use how for runtime behavior.

plugins/pstack/skills/why/SKILL.md

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Nov 6, 2026
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# Why

Investigate the motivation and intent behind code. The companion `how` skill answers what the code does and how it works. `why` answers what forces led to its shape.

Each spawn below names a role line in the model sheet and a default. Set `target` from that line's entry, or from the default if the sheet or the line is missing. Leave `target` unset when the value is `auto` or `inherit-parent`. If `delegate_task` rejects an entry, use the default and say so. If it rejects the default, use another target of the same family from `orchestrator_capabilities`. Pick each subagent's reasoning level and fast or standard speed for the job, per the Subagents section of the **poteto-mode** skill.

Every spawn is a `delegate_task` child with full tool access, MCP included, which the MCP-backed investigators and the synthesizer's citation spot-checks need. Investigators still shouldn't write anything.

## Operating Posture

Operate as a **careful, cautious, and precise investigator**. Be honest about what you know vs what you're inferring. Read `references/epistemics.md` for the full confidence framework and phrasing guide. The synthesizer must follow it.

## Step 1. Understand the Target and the Question