{"slug":"levnikolaevich-ln-71-system-design-baseline-builder","name":"ln-71-system-design-baseline-builder","description":"Creates a project baseline of architecture drivers and constraints. Use before design or planning; not for target design, plan review, implementation, or architecture audit.","long_description":"---\nname: ln-71-system-design-baseline-builder\ndescription: \"Creates a project baseline of architecture drivers and constraints. Use before design or planning; not for target design, plan review, implementation, or architecture audit.\"\n---\n\n# System Design Baseline Builder\n\n**Goal:** Create or update one durable source of truth for the project's architecture-driving requirements and constraints. Change only the approved architecture document; do not design the solution, review a plan, audit implementation, edit product code, or invent missing targets.\n\n**Execution contract:** Treat the ordered checkbox workflow below as this skill's Definition of Done. Track every checkbox as `PENDING`, then resolve it to `PROVEN` with concrete evidence, `CLEARED` with evidence that its conditional trigger is absent, or `UNPROVEN`; reading, mentioning, delegating, skipping, or tool failure is not proof.\nBefore returning, resolve every `PENDING`, count only `PROVEN` and `CLEARED` items as complete, apply this skill's verdict, decision, and approval rules to every `UNPROVEN`, and prepend **Checklist: X/Y complete**<br>**Incomplete: None | section/item — reason; outcome impact; exact next action**; list every `UNPROVEN` item.\n\n## Tool Routing\n\n| Need | Preferred capability | Fallback |\n|---|---|---|\n| Repository rules and document conventions | Native file reads plus focused search | User-provided convention with an explicit limitation |\n| Existing requirements and architecture artifacts | Narrow repository search and direct reads | Conversation evidence marked with its source |\n| Current workload or service evidence | Metrics, dashboards, logs, manifests, or checked-in reports | Mark `UNKNOWN`; never manufacture production numbers |\n| Current external limits or standards | Official documentation or specifications | Mark the claim `UNVERIFIED` |\n| Document mutation | Minimal patch to the approved Markdown artifact | Return `BLOCKED` if no safe writable path is authorized |\n\nUse external research only when a time-sensitive fact changes a constraint. Do not browse for values that must come from product owners, operators, the repository, or measured workload.\n\n## Artifact Rules\n\n- Prefer an existing unambiguous architecture-requirements document.\n- Otherwise use `docs/architecture/system-design-baseline.md`.\n- Read before writing, preserve unrelated content, and update facts in place instead of creating parallel truth.\n- Classify applicability separately as `APPLICABLE` or `NOT_APPLICABLE`, with evidence for exclusions.\n- Rank each applicable item as `DRIVER`, `SUPPORTING`, or `INFORMATIONAL`.\n- Classify evidence separately as `CONFIRMED`, `ASSUMED`, or `UNKNOWN`.\n- Record source, owner, confirmation date, and review trigger for each architecture driver.\n- Separate observed current values, required targets, hard limits, and future evolution triggers.\n- Use measurable quality-attribute scenarios; avoid words such as \"fast\", \"scalable\", or \"secure\" without a response measure.\n- Treat the baseline as versioned project knowledge, not an immutable promise.\n\n## Checklist\n\n### 1. Establish Scope and Destination\n\n- [ ] Resolve the project, business outcome, intended readers, approved documentation scope, and language.\n- [ ] Read applicable repository instructions and inspect Git state so unrelated changes remain untouched.\n- [ ] Search for existing requirement, architecture, SLO, recovery, security, cost, and ownership documents.\n- [ ] Select one canonical artifact: reuse a clear equivalent or choose the default path; explain why no duplicate will be created.\n- [ ] Return `BLOCKED` if the destination is ambiguous and choosing one could split project truth.\n\n### 2. Build the Evidence Ledger\n\n- [ ] Extract confirmed business goals, actors, critical journeys, scope, non-goals, and decision horizon.\n- [ ] Record sources for current workload, data volume, service behavior, platform limits, and existing commitments.\n- [ ] Separate repository facts from stakeholder choices and estimates.\n- [ ] Detect contradictions between documents, code, configuration, and stated requirements; preserve both claims until resolved.\n- [ ] Ask only for choices whose absence materially changes architecture; mark all other gaps `UNKNOWN`.\n\n### 3. Define and Prioritize Architecture Drivers\n\n- [ ] **Business and scope:** Record actors, critical journeys, business horizon, scope, non-goals, and externally committed outcomes.\n- [ ] **Demand and data scale:** Record current and target users, rates, concurrency, payloads, growth, retention, and forecast horizon where relevant.\n- [ ] **User-observable service quality:** Define SLIs and SLOs for availability, latency, throughput, error rate, correctness, or freshness with measurement windows.\n- [ ] **Data semantics and recovery:** Define consistency, ordering, idempotency, reconciliation, durability, backup, RTO, RPO, and acceptable data loss at affected boundaries.\n- [ ] **Security, privacy, and compliance:** Define trust boundaries, data classification, residency, access, audit, and destructive-action constraints.\n- [ ] **Operations and economics:** Define ownership, operational capacity, cost envelope, supported regions, delivery cadence, and platform or vendor constraints.\n- [ ] **Evolution:** Record thresholds, business events, or evidence that justify revisiting an assumption, target, or deferred capability.\n- [ ] Separate applicability, criticality, and evidence status; do not use `UNKNOWN` to mean unimportant or `NOT_APPLICABLE`.\n- [ ] Prioritize the few scenarios most likely to shape architecture and express each as source/stimulus/environment/artifact/response/measure.\n\n### 4. Write the Baseline\n\n- [ ] Create or update the artifact with: identity and status; business context; scope and non-goals; critical scenarios; workload and data; quality targets; recovery; consistency; security; cost and operations; constraints; assumptions and unknowns; review triggers.\n- [ ] Give every material parameter its theme, applicability, criticality, evidence status, value or range, source, owner, as-of date, and review trigger.\n- [ ] Keep calculations reproducible and label estimates separately from observed measurements.\n- [ ] Link shared architecture artifacts only by repository path or document title; never require a particular workflow or tool.\n- [ ] Preserve historical context needed to understand changed requirements instead of silently rewriting prior commitments.\n\n### 5. Validate and Report\n\n- [ ] Re-read the written artifact and verify that no unknown was converted into a confident fact.\n- [ ] Check that targets are measurable, internally consistent, and proportionate to the evidenced business horizon.\n- [ ] Check that every architecture-critical gap has an owner or exact next evidence action.\n- [ ] Confirm no product code, tests, unrelated documents, or external systems changed.\n- [ ] Use `READY` only when the baseline is usable for decisions and no material unknown lacks a safe handling rule; use `INCOMPLETE` for a useful artifact with consequential open drivers; use `BLOCKED` when scope, authority, or destination prevents safe creation.\n\n## Output Contract\n\n```markdown\n# System Design Baseline\n\n**Verdict:** READY | INCOMPLETE | BLOCKED\n**Artifact:** path\n\n## Established drivers\n- Prioritized architecture-driving scenarios\n- Applicable business, demand, quality, data, security, operational, economic, and evolution constraints\n\n## Driver register\n| Theme | Parameter | Applicability | Criticality | Evidence status | Value or measure | Source and owner | Review trigger |\n|---|---|---|---|---|---|---|---|\n\n## Changes made\n- Created or updated sections\n- Preserved conventions and related artifacts\n\n## Residual risks\nOnly constraints that can still reverse an architecture decision.\n```\n","tagline":"Creates a project baseline of architecture drivers and constraints. Use before design or planning; not for target design, plan review, implementation, or architecture audit.","category":"security","tags":["agent-skill"],"author":"levnikolaevich","verified":false,"attribution":{"status":"registry_indexed","statusLabel":"Registry indexed","shortLabel":"REGISTRY INDEXED","sourceLabel":"recursive skill source sync","sourceDetail":"levnikolaevich/claude-code-skills","creatorName":"levnikolaevich","creatorUrl":"https://github.com/levnikolaevich","sourceUrl":"https://github.com/levnikolaevich/claude-code-skills/tree/master/plugins/architecture-suite/skills/ln-71-system-design-baseline-builder","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/levnikolaevich-ln-71-system-design-baseline-builder#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. 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Read its SKILL.md or equivalent instructions first, install only the files needed for this workspace, and summarize any required setup before using it. Skill purpose: Creates a project baseline of architecture drivers and constraints. Use before design or planning; not for target design, plan review, implementation, or architecture audit. After the install attempt, report the result to https://www.openagentskill.com/api/agent/outcome with POST JSON {\"event_id\":\"install_<unique-id>\",\"skill_slug\":\"levnikolaevich-ln-71-system-design-baseline-builder\",\"task\":\"Install ln-71-system-design-baseline-builder\",\"agent\":\"codex\",\"outcome\":\"success\",\"install_used\":true}. Replace event_id with a unique value and outcome with success or failed. Report success only after the skill is installed and a minimal verification passes. Recorded instruction path: plugins/architecture-suite/skills/ln-71-system-design-baseline-builder/SKILL.md. Confirm the source matches these instructions. 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