ddia-principles SKILL.md skillA
ddia-principles from satbirbhbc-ux/ai-coding-principles is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add satbirbhbc-ux/ai-coding-principles/ddia-principles@git:20260323.933255aPins git:20260323.933255a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- satbirbhbc-ux/ai-coding-principles
- Path
ddia-principles/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260323.933255a, committed Mar 23, 2026
- Size
- 18,709 bytes
- Repository stars
- 4
- License
- MIT
Designing Data-Intensive Applications (DDIA) distilled reference guide by Martin Kleppmann. MUST be loaded when: designing database schemas, choosing storage engines, implementing replication or partitioning, handling distributed transactions, building batch/stream processing pipelines, choosing consistency models, implementing consensus, designing data flow architectures, evaluating trade-offs between availability and consistency, encoding/serialization decisions, data modeling…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Designing Data-Intensive Applications — Distilled Guide > Source: Martin Kleppmann, *Designing Data-Intensive Applications* > Central thesis: **Data is the core challenge of modern applications — not compute.** --- ## Part I: Foundations of Data Systems ### Chapter 1: Reliability, Scalability, Maintainability #### Three Pillars | Pillar | Definition | Key Metric | |--------|-----------|------------| | **Reliability** | System works correctly even when faults occur | Fault ≠ Failure; tolerate faults, prevent failures | | **Scalability** | System handles load growth gracefully | Measure with percentiles: p50, p95, p99, p999 | | **Maintainability** | System is easy to operate, understand, evolve | Operability + Simplicity + Evolvability | #### Fault Categories - **Hardware**: Random, independent (disk, RAM, power). Mitigate with redundancy (RAID, dual power). - **Software**: Systematic bugs affecting all nodes simultaneously (leap-second bug). Mitigate with process isolation, monitoring, chaos engineering. - **Human**: #1 cause of outages (config errors). Mitigate with good abstractions, sandboxes, canary deployments, fast rollback. #### Scalability Patterns …
Read the whole file at its exact version.
How to install
mdr add satbirbhbc-ux/ai-coding-principles/ddia-principles@sha256:3360b207b19359d1The line at the top of this page pins the label git:20260323.933255a, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_yl2pbockivodiegn)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Mar 23, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (18709 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
satbirbhbc-ux/ai-coding-principles · 4 stars · license MIT · pushed 2026-10-14 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_yl2pbockivodiegn GET https://markdownregistry.com/api/v1/resolve?ref=satbirbhbc-ux/ai-coding-principles/ddia-principles GET https://markdownregistry.com/api/v1/blob/3360b207b19359d1bd58c59f427d724900054936a00074743b1faf6f4f3e8e3f
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.