# Google Vertex AI: Guardrails and Fix Patterns
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> You are in a sub-page of **LLM_Providers**.
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> - [**LLM_Providers** — model vendors and deployment options](./README.md)
> - [**WFGY Global Fix Map** — main Emergency Room, 300+ structured fixes](../README.md)
> - [**WFGY Problem Map 1.0** — 16 reproducible failure modes](../../README.md)
>
> Think of this page as a desk within a ward.
> If you need the full triage and all prescriptions, return to the Emergency Room lobby.
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 + \” |
| **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)**
> 
⭐ [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).
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