Individual skill
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.
skills/why/SKILL.md
Source commit 91251ca92b107de606d3958e86454441910f1179
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- No
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Not checked yet
- Last checked
- Nov 5, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 18
- Repository last updated
- Nov 7, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- agent-skills Repository topic
- ai-agents Repository topic
- claude-code Repository topic
- code-review Repository topic
- codex Repository topic
- developer-tools Repository topic
- multi-agent Repository topic
- pstack Repository topic
- skills Repository topic
- t3-code Repository topic
- data Derived category
- design Derived category
- devops Derived category
- docs Derived category
Files and excerpt
File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.
Browse files
SKILL.mdcore · 10,207 bytesSKILL.mdcore · 10,207 bytesSKILL.mdcore · 10,207 bytesSKILL.mdcore · 10,207 bytesreferences/epistemics.mddoc · 6,736 bytesreferences/investigator-prompt.mddoc · 5,554 bytesreferences/source-playbook.mddoc · 1,363 bytesreferences/sources/code-archaeology.mddoc · 1,440 bytesreferences/sources/databricks.mddoc · 6,994 bytesreferences/sources/datadog.mddoc · 4,971 bytesreferences/sources/incident-postmortem.mddoc · 372 bytesreferences/sources/linear.mddoc · 2,996 bytesreferences/sources/notion.mddoc · 2,853 bytesreferences/sources/sentry.mddoc · 2,089 bytesreferences/sources/slack.mddoc · 1,336 bytesreferences/synthesizer-prompt.mddoc · 7,146 bytes
Read excerpt
# Why
Read [the pstack-t3 runtime](../pstack-runtime/SKILL.md) before spawning workers, choosing models, scheduling, or isolating work. It maps those steps onto T3's orchestrator tools.
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. Resolve its seat per the [runtime's Roles section](../pstack-runtime/SKILL.md#roles) and spawn with `delegate_task`. Omit `target` for an `inherit` seat. If T3 rejects a target, fall back per the runtime and say which seat changed. Pass the seat the role this step names, per the Subagents section of the poteto-mode skill.
[The runtime's Modes section](../pstack-runtime/SKILL.md#modes) sets the mode lines of every brief this skill writes and how its spawns run in light mode.
Every spawn is `delegate_task` with `role: "research"` and a read-only brief that says "Do not edit files, commit, or push." **Do not lower the child's runtime mode to strip tools.** The MCP-backed investigators and the synthesizer's citation spot-checks need their MCP tools, so the brief carries the read-only constraint.
## Operating Posture
