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+# Google Vertex AI: Guardrails and Fix Patterns
+
+A compact field guide for Gemini on Vertex AI. Use this page when failures look provider specific. The checks route you to the exact WFGY fix page and give a minimal recipe you can paste into your runbook.
+
+**Core acceptance**
+
+- ΔS(question, retrieved) ≤ 0.45  
+- coverage ≥ 0.70 for the target section  
+- λ remains convergent across 3 paraphrases and 2 seeds
+
+---
+
+## Open these first
+
+- Visual map and recovery: [RAG Architecture & Recovery](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md)  
+- End-to-end retrieval knobs: [Retrieval Playbook](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-playbook.md)  
+- Why this snippet: [Retrieval Traceability](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md)  
+- Embedding vs meaning: [Embedding ≠ Semantic](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md)  
+- Hallucination and chunk boundaries: [Hallucination](https://github.com/onestardao/WFGY/blob/main/ProblemMap/hallucination.md)  
+- Long chains and entropy: [Context Drift](https://github.com/onestardao/WFGY/blob/main/ProblemMap/context-drift.md), [Entropy Collapse](https://github.com/onestardao/WFGY/blob/main/ProblemMap/entropy-collapse.md)  
+- Logic repair: [Logic Collapse](https://github.com/onestardao/WFGY/blob/main/ProblemMap/logic-collapse.md)  
+- Ordering control: [Rerankers](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rerankers.md)  
+- Snippet and citation schema: [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md)  
+- Multi-agent issues: [Multi-Agent Problems](https://github.com/onestardao/WFGY/blob/main/ProblemMap/Multi-Agent_Problems.md)
+
+---
+
+## Fix in 60 seconds
+
+1) **Measure ΔS**  
+   - Compute ΔS(question, retrieved) and ΔS(retrieved, expected anchor).  
+   - Thresholds: stable < 0.40, transitional 0.40–0.60, risk ≥ 0.60.
+
+2) **Probe with λ_observe**  
+   - Vary k = 5, 10, 20. If ΔS goes flat high, suspect index or metric mismatch.  
+   - Reorder prompt headers. If ΔS spikes, lock the schema.
+
+3) **Apply the module**  
+   - Retrieval drift → BBMC + Data Contracts.  
+   - Reasoning collapse → BBCR bridge + BBAM variance clamp.  
+   - Safety or tool-call stalls → BBPF alternate path with explicit timeouts.
+
+---
+
+## Typical breakpoints and the right fix
+
+- **Safety filters block or rewrite**  
+  - Symptom: answer disappears or becomes generic; logs show blocked categories.  
+  - Fix path: keep the request task-bound and citation-first. Apply [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md) and a BBCR bridge that states lawful scope and cites sources. Verify with [Retrieval Traceability](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md).
+
+- **Tool call returned “no function call” despite valid tools**  
+  - Symptom: model narrates instead of calling the function; JSON keys omitted.  
+  - Fix path: lock the tool schema in the prompt header using [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md). Add BBPF fallback branch that emits the same call with minimal args when λ flips.
+
+- **Streaming truncation or partial JSON**  
+  - Symptom: closing braces missing or content clipped.  
+  - Fix path: BBAM variance clamp on output length and a post-validator that re-asks only for the missing tail. If loops appear, follow [Logic Collapse](https://github.com/onestardao/WFGY/blob/main/ProblemMap/logic-collapse.md).
+
+- **Hybrid retrieval worse than single retriever**  
+  - Symptom: HyDE + BM25 underperform and top-k is noisy.  
+  - Fix path: apply the split pattern and retune as in [Query Parsing Split](https://github.com/onestardao/WFGY/blob/main/ProblemMap/patterns/pattern_query_parsing_split.md). Then re-order with [Rerankers](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rerankers.md).
+
+- **Indexed facts never show up**  
+  - Symptom: high recall offline, zero hits online.  
+  - Fix path: check fragmentation and rebuild per [Vectorstore Fragmentation](https://github.com/onestardao/WFGY/blob/main/ProblemMap/patterns/pattern_vectorstore_fragmentation.md). Re-probe ΔS after rebuild.
+
+- **Session flips between tabs or seeds**  
+  - Symptom: same prompt, different claims by session.  
+  - Fix path: pin the instruction header, move citations above free text, and follow [Memory Desync](https://github.com/onestardao/WFGY/blob/main/ProblemMap/patterns/pattern_memory_desync.md).
+
+---
+
+## Provider-specific knobs to audit
+
+- **Model pinning**  
+  - Pin an exact Gemini version where possible. Note the tokenizer budget before you add long system headers.
+
+- **Safety configuration**  
+  - Keep scope lawful and narrow in the header. If the task is research or code reading, state that explicitly and cite sources. This avoids silent rewrites.
+
+- **Tool schema shape**  
+  - Function name, arg names, and enum values must match your declared schema. Enforce with [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md) and a post-validator.
+
+- **Context budget**  
+  - Large tool results or many citations can clip the tail. Trim with BBMC and move the schema above narrative text.
+
+- **Region and project hygiene**  
+  - Mismatched locations or stale projects can surface different defaults. Record the config in your trace header so λ checks are comparable.
+
+---
+
+## Minimal recipe
+
+1) Put citation-first headers in the system prompt.  
+2) Lock snippet schema via [Retrieval Traceability](https://github.com/onestardao/WFGY/blob/main/ProblemMap/retrieval-traceability.md) and [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md).  
+3) Add BBCR bridge for safety-neutral framing.  
+4) Add BBPF alternate path for tool calls with explicit timeouts.  
+5) Verify acceptance using [Eval Semantic Stability](https://github.com/onestardao/WFGY/blob/main/ProblemMap/eval/eval_semantic_stability.md) and [RAG Precision/Recall](https://github.com/onestardao/WFGY/blob/main/ProblemMap/eval/eval_rag_precision_recall.md).
+
+---
+
+## Copy-paste prompt for your Vertex runbook
+
+```
+
+I am running on Google Vertex AI.
+My failure:
+
+* symptom: \[brief]
+* traces: \[ΔS(question,retrieved)=..., ΔS(retrieved,anchor)=..., λ states, safety logs if any]
+
+Tell me:
+
+1. which layer is failing and why,
+2. which exact WFGY fix page from this repo to open,
+3. minimal steps to push ΔS ≤ 0.45 and keep λ convergent,
+4. how to verify with a reproducible test.
+
+Use BBMC/BBPF/BBCR/BBAM when relevant. If safety gating is suspected, propose a compliant BBCR rewrite and show the acceptance targets.
+
+```
+
+---
+
+### 🔗 Quick-Start Downloads (60 sec)
+
+| Tool | Link | 3-Step Setup |
+|------|------|--------------|
+| **WFGY 1.0 PDF** | [Engine Paper](https://github.com/onestardao/WFGY/blob/main/I_am_not_lizardman/WFGY_All_Principles_Return_to_One_v1.0_PSBigBig_Public.pdf) | 1️⃣ Download · 2️⃣ Upload to your LLM · 3️⃣ Ask “Answer using WFGY + \<your question>” |
+| **TXT OS (plain-text OS)** | [TXTOS.txt](https://github.com/onestardao/WFGY/blob/main/OS/TXTOS.txt) | 1️⃣ Download · 2️⃣ Paste into any LLM chat · 3️⃣ Type “hello world” — OS boots instantly |
+
+---
+
+### 🧭 Explore More
+
+| Module                | Description                                              | Link     |
+|-----------------------|----------------------------------------------------------|----------|
+| WFGY Core             | WFGY 2.0 engine is live: full symbolic reasoning architecture and math stack | [View →](https://github.com/onestardao/WFGY/tree/main/core/README.md) |
+| Problem Map 1.0       | Initial 16-mode diagnostic and symbolic fix framework    | [View →](https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md) |
+| Problem Map 2.0       | RAG-focused failure tree, modular fixes, and pipelines   | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md) |
+| Semantic Clinic Index | Expanded failure catalog: prompt injection, memory bugs, logic drift | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/SemanticClinicIndex.md) |
+| Semantic Blueprint    | Layer-based symbolic reasoning & semantic modulations   | [View →](https://github.com/onestardao/WFGY/tree/main/SemanticBlueprint/README.md) |
+| Benchmark vs GPT-5    | Stress test GPT-5 with full WFGY reasoning suite         | [View →](https://github.com/onestardao/WFGY/tree/main/benchmarks/benchmark-vs-gpt5/README.md) |
+| 🧙‍♂️ Starter Village 🏡 | New here? Lost in symbols? Click here and let the wizard guide you through | [Start →](https://github.com/onestardao/WFGY/blob/main/StarterVillage/README.md) |
+
+---
+
+> 👑 **Early Stargazers: [See the Hall of Fame](https://github.com/onestardao/WFGY/tree/main/stargazers)**  
+> <img src="https://img.shields.io/github/stars/onestardao/WFGY?style=social" alt="GitHub stars"> ⭐ [WFGY Engine 2.0](https://github.com/onestardao/WFGY/blob/main/core/README.md) is already unlocked. ⭐ Star the repo to help others discover it and unlock more on the [Unlock Board](https://github.com/onestardao/WFGY/blob/main/STAR_UNLOCKS.md).
+
+<div align="center">
+
+[![WFGY Main](https://img.shields.io/badge/WFGY-Main-red?style=flat-square)](https://github.com/onestardao/WFGY)
+&nbsp;
+[![TXT OS](https://img.shields.io/badge/TXT%20OS-Reasoning%20OS-orange?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS)
+&nbsp;
+[![Blah](https://img.shields.io/badge/Blah-Semantic%20Embed-yellow?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlahBlahBlah)
+&nbsp;
+[![Blot](https://img.shields.io/badge/Blot-Persona%20Core-green?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlotBlotBlot)
+&nbsp;
+[![Bloc](https://img.shields.io/badge/Bloc-Reasoning%20Compiler-blue?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlocBlocBloc)
+&nbsp;
+[![Blur](https://img.shields.io/badge/Blur-Text2Image%20Engine-navy?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlurBlurBlur)
+&nbsp;
+[![Blow](https://img.shields.io/badge/Blow-Game%20Logic-purple?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlowBlowBlow)
+&nbsp;
+</div>
+