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Phase 4 of the multi-skill build effort. Same 14-step pipeline.
## What landed
### New skill: engineering/slo-architect
End-to-end SLO discipline per Google SRE Workbook. Published as BOTH:
- Standalone plugin: engineering/slo-architect/
- Bundled mirror: engineering/skills/slo-architect/
3 stdlib-only Python tools (Karpathy complexity 95/100):
- slo_designer.py — generates SLO definitions; refuses to render
if required fields missing (owner, policy doc,
SLI numerator/denominator). Supports 5 SLI
types: request-success-rate, request-latency,
availability-time, data-freshness, correctness.
- error_budget_calculator.py — computes error budget AND the canonical
multi-window burn-rate alert thresholds:
fast (1h/5m, page), slow (6h/30m, page),
ticket (3d/6h). Output is PromQL-shaped,
ready to paste into Prometheus rules.
- slo_review.py — audits SLO docs for 7 common bugs:
target ≥99.99, target ≤99, window <7d,
window >90d, no SLI definition, no error
budget policy, CPU-as-SLI.
4 reference docs:
- slo_principles.md — SLI vs SLO vs SLA, Google SRE Workbook canon
- sli_design.md — 5 SLI types with examples and anti-patterns
- error_budget.md — error budget math, burn-rate alerts, budget policy
- composition.md — how SLOs feed feature-flags, chaos, kubernetes-operator
Asset templates:
- slo_template.yaml — fillable SLO YAML with all required fields
- error_budget_policy.md — fillable 4-state policy (HEALTHY / CAUTION /
CRITICAL / VIOLATED)
Plus: SKILL.md, README.md, /slo-design slash command.
## Composition with prior phases
Explicit wire-up to the rest of the portfolio:
- feature-flags-architect.kill_switch_audit references SLO burn-rate
- chaos-engineering.blast_radius_calculator takes SLO error budget as input
- kubernetes-operator capability level L4 requires SLOs + Prometheus rules
The SLO is the unifying number: rollout abort, chaos blast radius, and
operator capability all reference it. references/composition.md walks
through end-to-end use.
## Audit verdict (evidence-based)
Closest existing skill: engineering/observability-designer covers SLI/SLO as
ONE topic among many (metrics, logs, traces, dashboards, alerting). It has
no dedicated tools and is breadth-not-depth. slo-architect is the focused
SLO discipline with deterministic Python tools — same gap pattern as
kubernetes-operator vs senior-devops.
## Marketplace / registry
- marketplace.json: slo-architect registered as standalone plugin
- engineering-advanced-skills bundle: 49 → 50 skills, version → 2.4.4
- engineering/.claude-plugin/plugin.json: version + skill list updated
- mkdocs.yml: nav entry under "Engineering - POWERFUL"
- docs/skills/engineering/slo-architect.md: docs page (manual)
- docs/commands/slo-design.md: auto-generated
- .codex/, .gemini/: synced
## Karpathy-coder gates
- complexity_checker (strict): 95/100 average — same top score as
chaos-engineering. 1 WARN (depth 7 in slo_review.py from generator
expressions). Verdict: WARN, not FAIL.
- All 1689 tests pass (was 1671; +18 for the new skill).
- mkdocs build --strict: succeeded in 12.47s.
## Verifiable success criteria (all green)
✓ scripts/*.py --help → exit 0 for all 3 scripts
✓ SKILL.md frontmatter → name + description + tags + compatible_tools
✓ plugin.json schema → 8 fields exact (verified)
✓ sync_skill_bundles → standalone ↔ bundled mirror in sync
✓ marketplace.json → standalone entry + bundle counts updated
✓ generate-docs.py → command page generated (skill page manual)
✓ mkdocs build --strict → succeeded
✓ cross-tool sync → codex + gemini synced
✓ pytest tests/ → 1689 passed, 0 failed
✓ CHANGELOG.md → [Unreleased] entry expanded for Phase 4
✓ Self-test → error_budget_calculator on 99.9% / 28d emits
correct burn-rate (14.4 fast, 6 slow, 1 ticket)
✓ Composition → references named skills explicitly compose
## Phase 1+2+3+4 cumulative
- 4 new skills: feature-flags-architect, kubernetes-operator,
chaos-engineering, slo-architect
- 12 new Python tools (all stdlib, all <250 LOC, average complexity 92/100)
- 16 new reference docs
- 4 new slash commands (/flag-cleanup, /operator-audit, /chaos-experiment,
/slo-design)
https://claude.ai/code/session_01Dq12xJakFRxwaoU8Pqejdm
Co-authored-by: Claude <noreply@anthropic.com>
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| .. | ||
| .gitkeep | ||
| a11y-audit.md | ||
| changelog.md | ||
| chaos-experiment.md | ||
| code-to-prd.md | ||
| competitive-matrix.md | ||
| financial-health.md | ||
| flag-cleanup.md | ||
| focused-fix.md | ||
| google-workspace.md | ||
| karpathy-check.md | ||
| okr.md | ||
| operator-audit.md | ||
| persona.md | ||
| pipeline.md | ||
| plugin-audit.md | ||
| prd.md | ||
| project-health.md | ||
| retro.md | ||
| rice.md | ||
| saas-health.md | ||
| seo-auditor.md | ||
| slo-design.md | ||
| sprint-health.md | ||
| sprint-plan.md | ||
| tc.md | ||
| tdd.md | ||
| tech-debt.md | ||
| user-story.md | ||
| wiki-ingest.md | ||
| wiki-init.md | ||
| wiki-lint.md | ||
| wiki-log.md | ||
| wiki-query.md | ||