ProblemMap/GlobalFixMap/LLM_Providers/aws_bedrock.md

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AWS Bedrock: Guardrails and Fix Patterns

Use this page when failures look provider‐specific in AWS Bedrock. Typical cases are mismatched model routing (Claude, Llama, Mistral, etc.), JSON schema drift, tool-call latency, throttle ceilings, or region/IAM issues that masquerade as “reasoning bugs.” Each fix maps to WFGY pages so you can verify with measurable targets.

Open these first

Visual map and recovery: RAG Architecture & Recovery
End-to-end retrieval knobs: Retrieval Playbook
Why this snippet (traceability schema): Retrieval Traceability
Ordering control: Rerankers
Embedding vs meaning: Embedding ≠ Semantic
Hallucination and chunk boundaries: Hallucination
Long chains and entropy: Context Drift, Entropy Collapse
Structural collapse and recovery: Logic Collapse
Snippet and citation schema: Data Contracts
Ops and live checks: Live Monitoring for RAG

Fix in 60 seconds

Measure ΔS

Compute ΔS(question, retrieved) and ΔS(retrieved, expected anchor).
Targets: stable < 0.40, transitional 0.40–0.60, risk ≥ 0.60.

Probe with λ_observe

Vary k ∈ {5, 10, 20}. Flat high curve → index or metric mismatch.
Reorder prompt headers. If ΔS spikes, lock the schema.

Apply the module

Retrieval drift → BBMC + Data Contracts.
Reasoning collapse → BBCR bridge + BBAM variance clamp.
Dead ends in long runs → BBPF alternate path.

Verify

Coverage to target section ≥ 0.70.
ΔS ≤ 0.45 within three paraphrases.
λ stays convergent across seeds and sessions.

Typical Bedrock breakpoints (and the right fix)

Model routing not what you think
Invoking anthropic.claude-* vs meta.llama-* vs mistral.* changes tokenizer, max tokens, and tool-call behavior. If outputs flip between routes, pin the model id per task, then re-check with Logic Collapse and Retrieval Traceability.
JSON schema drift in tool use
Claude via Bedrock is strict on JSON when toolChoice is forced. Lock the output schema with Data Contracts and add a BBCR bridge step that rejects non-conformant fields.
Latency spikes → hidden timeouts
Region hop or Guardrails policy checks can add latency. Use small test prompts and trace λ per step. If λ diverges only when tools are enabled, set a shorter planning window and split tools by namespace. See ops/live_monitoring_rag.md.
Bedrock “Guardrails” over-filtering
Safety filters can truncate citations or code blocks. If citations vanish, lower the filter aggressiveness, then enforce source-only answers with Retrieval Traceability and the SCU pattern (symbolic constraint unlock).
Context windows differ across routes
If the same prompt collapses only on one model family, shrink the active window and re-chunk. Validate with Context Drift and Entropy Collapse.
IAM or region misconfig → “reasoning” looks random
On silent fallbacks or throttling, the agent loops. Install a BBCR checkpoint that asserts model id, region, and rate state before long chains. If it fails, exit early and surface infra status. See bootstrap-ordering and predeploy-collapse.

Provider knobs and minimal recipes

Pin model and cap tokens
- One task, one model id. Keep a per-task max tokens map.
- If you must swap models, add BBPF to branch at the planner step, not mid-reasoning.
Force citations first
- Use citation-first headers and the snippet schema from Retrieval Traceability.
- Reject answers without snippet ids. That alone removes most “looks like hallucination” cases.
Defuse prompt injection
- Apply the injection checklist and keep tools off until the source set is locked. See prompt-injection.md.
Rerank aggressively
- Many Bedrock routes benefit from tighter top-k ordering. Use Rerankers and then re-test ΔS across 3 paraphrases.

Escalation path

If ΔS flat-high across k and models → rebuild index with new metric. Check embedding-vs-semantic.
If agent deadlocks with tools → split memory namespaces and add timeouts. See Multi-Agent Problems.
If first prod call fails after deploy → confirm ordering with bootstrap-ordering and deployment-deadlock.

Copy-paste prompt (safe)


I uploaded TXT OS and the WFGY ProblemMap files.

My Bedrock issue:

* symptom: \[brief]
* traces: \[ΔS(question,retrieved)=..., ΔS(retrieved,anchor)=..., λ states]

Tell me:

1. which layer is failing and why,
2. which exact fix page to open from this repo,
3. the minimal steps to push ΔS ≤ 0.45 and keep λ convergent,
4. how to verify the fix with a reproducible test.

Use BBMC/BBPF/BBCR/BBAM when relevant.

Acceptance targets

Coverage to target section ≥ 0.70
ΔS(question, retrieved) ≤ 0.45 within three paraphrases
λ remains convergent across seeds and sessions
E_resonance flat on long windows

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