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Extends api-design.md beyond its security/operations focus with three new dimensions: - §0 API-First Design Process — OpenAPI 3.1 as single source of truth, Spectral governance, dogfooding (UIs consume the public API, no privileged backdoors), auth-required-by-default as a design stance. - §7 Documentation and Developer Experience — Scalar/Mintlify, RFC 9457 Problem Details error envelope, interactive playgrounds, generated SDKs (Stainless, Speakeasy, Fern), RFC 9745 deprecation signals and changelog UX. - §8 Contract Testing and API Quality — schema validation in the test suite, Pact CDC vs provider verification, Schemathesis property-based fuzzing, oasdiff drift detection in CI, the API test pyramid. Intro, cross-refs in §3.1/§3.3/§4.1, and Sources block reorganised by topic. Index entry in BESTPRACTICES.md updated. PLAN file included for traceability. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Best Practices Index
Generalised best practices extracted from real project work via the /distill-best-practices skill. Each topic file is self-contained — read only the files relevant to the current project.
Topics
- Validation & Deployment — Validate locally, deploy once; full-chain testing; pre-flight checks; DB migration patterns; K8s constraint planning; deployment checklists; inert-by-default feature flags; integration failure categorisation; safe persistence pattern
- Security Architecture — Server boundary rule: no credential crosses to the client; proxy + identity mapping pattern; defense in depth; anti-patterns
- Secrets Management — SOPS + age, credential handling, file naming, encryption gotchas, .env source injection, URL-safe passwords, per-workload secret scoping
- Git & Source Control — Commit practices, GitOps workflows, remote conventions
- Kubernetes Patterns — Volume mounts, deployment strategies, naming, bootstrap ordering, ArgoCD SSA quirks, etcd tuning, Secret volume gotchas, probe timeouts, Kustomize overlay image overrides, PodSecurity for monitoring, Cilium entity identities
- Helm Charts — Schema validation, version verification, values structure
- Ansible — Inventory, templates, idempotency, credential safety
- Scripting — Shell conventions, verification scripts, idempotency, colour output
- Documentation Standards — CLAUDE.md, MEMORY.md, FUTURE.md, README.md structure and tiered memory
- Milestones & Reflections — Milestone workflow, verification, reflection process
- Debugging Methodology — Systematic diagnosis, full-chain testing, common pitfalls, DB schema verification after deploy
- Claude Code Skills — Skill authoring, context injection, tool restrictions, read-only review skills, formatter/hook separation
- Linting & Formatting — Tool choices per language, PostToolUse hook, pre-commit integration, formatter contract
- Spec-Driven Development — Spec structure, requirement numbering, test-first workflow, multi-model review, plan-first approach, agent prompt conventions, wave-based TDD dispatch
- Test-Driven Development — Edge case discovery, property-based testing, mutation testing, AI agent testing patterns, test architecture
- Networking & Infrastructure — nftables safety, systemd socket activation, Docker forwarding, TLS SNI vs Host header, wildcard certs
- Docker UID Matching — UID wrapper entrypoint for mounted volumes, gosu pattern, when to use vs K8s securityContext
- Database Selection — SQLite is not a production database; always use PostgreSQL for services with FQDNs, multiple consumers, or concurrent access
- Docker — gosu PID 1, GIT_SSH_COMMAND scope, slim image health checks, buildx local images, Compose networking/restart gotchas, volume paths, override merge behaviour, init script privilege order, payload size limits, bind-mount rm gotcha
- API Design — API-first methodology (OpenAPI 3.1 source of truth, Spectral governance, dogfooding, auth-by-default); transport, auth (OAuth2/JWT/mTLS), versioning, errors, idempotency, rate limiting, validation, zero-trust; docs/DX (Scalar/Mintlify, RFC 9457 errors, generated SDKs, RFC 9745 deprecation); contract testing (Schemathesis, Pact, oasdiff drift detection, test pyramid)
- API Integration — Client-side third-party API integration: capability verification, app-layer compensation, git+SOPS polling sync, bidirectional SoR
- Octopus Process Templates — OCL syntax, step template references, channel scoping, parameters, versioning, Platform Hub patterns
- LLM Code Security — Security vulnerabilities in AI-generated code: injection flaws, hardcoded secrets, hallucinated packages, over-permissive defaults, IaC risks, crypto mistakes, operational vulnerabilities (idempotency, CI/CD integrity, supply chain provenance, concurrent access), review checklists
- CI Container Builds — Registry cache with inline metadata, buildx in DinD, layer ordering, pip caching, path filter gotchas, SHA tagging strategy, runtime-mounted directory triggers
- Agent Repos & Container Agents — Task submission, harnesses, monitoring, multi-model workflows, agent repo forks, workspace layout, artifact passing via git branches, read-only test protection, infrastructure failure modes, cost-effective model scope boundaries
- AI Parallel Agents — Parallel agent orchestration: multi-facet research dispatch, file contention, WebFetch limits, narrow reads, dataset-wide audits
- Python Patterns — Non-reentrant Lock deadlocks, Pydantic v2 extra='ignore' silent drops, subprocess routing callables for mocking, model_validator for cross-field validation