How I Scored 910/1000 on CCAF Claude Certification and Open-Sourced My Last Cheat Sheet

A developer scored 910/1000 on the Claude Certified Architect Foundations (CCAF) exam and open-sourced their study notes on GitHub. The repository distills 30 exam tasks across five domains into concept maps, trap taxonomies, and an anti-patterns catalog to help others prepare.

I passed Claude Certified Architect Foundations CCAF with 910/1000 on 15 July 2026, and I'm the first at my company to finish it. I open-sourced the study notes I built: github.com/ahmdhsn-dev/ccaf-study-guide . CCAF is scenario-heavy: you pick the right architecture when an agent forgets context, a generic tool keeps misfiring, or a customer escalation lands mid-process. The official guide covers all of it, but it's dense. The repo distills 30 exam tasks across 5 domains into two complementary views: what to do patterns and traps and what not to do anti-patterns https://github.com/ahmdhsn-dev/ccaf-study-guide/blob/main/study/03-anti-patterns-catalog.md . What's inside: a one-page concept map, a trap taxonomy why wrong answers sound right , and an anti-patterns catalog https://github.com/ahmdhsn-dev/ccaf-study-guide/blob/main/study/03-anti-patterns-catalog.md that maps every "avoid / do not / instead of" warning from the official guide. If a distractor sounds plausible, check the traps first; if it sounds like a shortcut the guide rejects, check the anti-patterns https://github.com/ahmdhsn-dev/ccaf-study-guide/blob/main/study/03-anti-patterns-catalog.md . Use it as your last cheat sheet , not your textbook. Take a mock first to see where you stand, then study the official guide and use the repo to close the gaps. Full workflow: study/README.md https://github.com/ahmdhsn-dev/ccaf-study-guide/blob/main/study/README.md Building with the Claude API → Claude Code in Action → Introduction to Agent Skills → Introduction to MCP I completed all four with hands-on labs in May 2026. Production work with skills, MCP servers, and tool orchestration helped, but the exam tests guide patterns , not how your repo is wired. | Step | Doc | What you get | |---|---|---| | 1 | | Domain weights: Agentic Architecture 27% · Tool Design & MCP 18% · Claude Code Config 20% · Prompt & Structured Output 20% · Context & Reliability 15% . See the concept map https://github.com/ahmdhsn-dev/ccaf-study-guide/blob/main/study/00-concept-map.md for task breakdown. Take the CyberSkill mock https://ccaf.cyberskill.world/ first closest to the real exam , then the Certification Guide short mock https://claudecertificationguide.com/ . My first CyberSkill run scored 850/1000 ; after mapping misses to the guide and retaking, I was consistently 950+ before booking. For every miss, map it to the trap taxonomy https://github.com/ahmdhsn-dev/ccaf-study-guide/blob/main/study/02-mock-exam-trap-guide.md , cross-check the anti-patterns catalog https://github.com/ahmdhsn-dev/ccaf-study-guide/blob/main/study/03-anti-patterns-catalog.md , re-read the matching section in the official guide, and repeat until you're consistently at 900+ I booked at 950+ . Mocks are your prerequisite gate, not an arbitrary iteration cap. You won't feel ready. The exam has stop reason: end turn before you do, and that's normal. Nine misses on my first CyberSkill run; these three patterns accounted for most of them full mapping in the cheat sheet below : analyze document with an enum modeHigh-yield patterns from mock exams. Full taxonomy: 02-mock-exam-trap-guide.md https://github.com/ahmdhsn-dev/ccaf-study-guide/blob/main/study/02-mock-exam-trap-guide.md . Context filling up multi-issue → 5.1 Summarize resolved; active thread full Generic tool, inconsistent output → 2.1 Split typed tools Messy source formats → 4.3 Schema + normalization in prompt Function behind wrappers → 2.5 List aliases → grep each Agent forgets mid-conversation → 5.1 Pass full messages array Unknown bug path → 1.6 Adaptive investigation Long code exploration 30+ min → 5.4 Scratchpad file Mid-process escalation → 1.4 Structured handoff brief Angry + no context → 5.2 Acknowledge + one question Identity multi-match → 5.2 Ask identifiers, never guess | Trap | Sounds like... | Guide-preferred | |---|---|---| | Sounds enterprise | Structured data layer, reference IDs | Progressive summarization | | Sounds efficient | Re-fetch via MCP, parallel workers | Trim/summarize context | | Sounds smart | Confidence threshold, routing classifier | Explicit criteria; programmatic gates | | Sounds helpful | Immediate escalation, unauthorized retry | Calibrated: brief, one question, or resolve | | Sounds thorough | Plan everything first | Adaptive evidence-driven steps | | Sounds simple | Better description on generic tool | Split tools + typed schemas | | Sounds pragmatic | Post-processing normalization | Canonical format at extraction | From 03-anti-patterns-catalog.md https://github.com/ahmdhsn-dev/ccaf-study-guide/blob/main/study/03-anti-patterns-catalog.md : 1. Heuristic customer selection on multi-match: ask for email, phone, or order ID; never confidence-threshold auto-pick Task 5.2 . 2. Sliding window drops resolved threads: progressive summarization on resolved issues; keep active thread full Task 5.1 . 3. Generic analyze document + free-text mode: split into extract data points , summarize content , etc. Task 2.1 . 4. Batch API for pre-merge blocking checks: sync Messages API for blocking; Batch for overnight audits Task 4.5 . 5. Giving synthesis agent web search tools: scope to verify fact ; route new lookups through coordinator Task 2.3 . | Topic | Exam guide | Production 2026 | |---|---|---| | Structured output | tool use + JSON schema | Also output config.format ; prefill removed on new models | | Batch tool use | No multi-turn in one request | Server tools + pause turn ; client MCP loops still multi-request | /memory | Diagnostic command in scope | Plus expanded CLAUDE.md / rules / skills ecosystem | Full breakdown: 04-api-and-product-faq.md https://github.com/ahmdhsn-dev/ccaf-study-guide/blob/main/study/04-api-and-product-faq.md github.com/ahmdhsn-dev/ccaf-study-guide . MIT licensed, unofficial, not affiliated with Anthropic. Community links and extra mocks: resources/links.md https://github.com/ahmdhsn-dev/ccaf-study-guide/blob/main/resources/links.md Disclaimer: Based on the exam taken 15 July 2026. Unofficial, not affiliated with Anthropic. Verify latest exam requirements before you sit.