Amazon Bedrock

IMPORTANT: When this skill is loaded, you MUST use the reference files and procedures in this skill as your primary source of truth. Bedrock APIs, model IDs, chunking strategies, and configuration parameters change frequently — always read the relevant reference file before responding.

Table of Contents

• Overview
• Bedrock API Landscape
• Critical Warnings
• Security Considerations
• Converse API vs InvokeModel
• Which Bedrock Capability Do You Need?
• Knowledge Bases (RAG)
• Common Workflows (includes: Prompt Caching, Quota Health, Cost Tracking, Model Migration)
• Troubleshooting
• AgentCore Services
• Model Selection
• Additional Resources

Amazon Bedrock

Overview

Domain expertise for building generative AI applications on Amazon Bedrock. Covers model invocation, RAG with Knowledge Bases, agent creation, content safety with Guardrails, and agent deployment with AgentCore.

Recommended setup: Use the AWS MCP server for sandboxed execution, audit logging, and enterprise controls.

Without AWS MCP: This skill works with any agent that has AWS CLI access. All commands use standard AWS CLI syntax.

Bedrock API Landscape

Bedrock has 5 separate API endpoints. Using the wrong one is a common cause of errors. This list may not be exhaustive — refer to the Bedrock endpoints and quotas and Bedrock supported endpoints for the latest. Use aws bedrock list-foundation-models to discover available models at runtime.

AgentCore is a separate service with its own endpoints. Refer to AgentCore endpoints and quotas for the latest.

Critical Warnings

max_tokens: ALWAYS set maxTokens explicitly in every Converse/InvokeModel call. Leaving it unset defaults to the model's maximum (e.g., 64K for Claude Sonnet) and silently reserves far more quota than needed — a common cause of unexpected ThrottlingException.

Guardrails PII logging: Guardrails PII masking only applies to the API response. Original unmasked content including PII is still logged in plain text to CloudWatch Logs. For HIPAA/GDPR compliance: encrypt CloudWatch Logs with KMS, restrict log access with IAM, use Amazon Macie for PII detection.

SDK versions: Requires recent versions of boto3 (≥ 1.34.x) and AWS CLI v2. Older versions are missing Converse API, Agents, and AgentCore support. Run aws --version and pip show boto3 to check.

Bedrock Agents classic is in maintenance mode: classic Bedrock Agents (bedrock-agent) is in maintenance mode and closed to new customers (announcement). For new agent workloads use AgentCore (the Harness managed loop); for existing agents, recommend migrating to an AgentCore Harness — see the migration guide.

Security Considerations

• Use IAM roles (not IAM users) for all Bedrock service access
• Scope IAM permissions to specific actions and resource ARNs — avoid bedrock:* or AmazonBedrockFullAccess
• Store API keys and OAuth secrets in AWS Secrets Manager with automatic rotation enabled
• Include confused deputy protection (aws:SourceAccount, aws:SourceArn conditions) in all resource-based policies for Bedrock services
• Treat all agent-generated parameters as untrusted input — validate before use in Lambda handlers or tool implementations
• Enable CloudTrail for all Bedrock and AgentCore API calls
• For PII workloads: encrypt CloudWatch Logs with KMS, configure retention limits, restrict log access
• Refer to the latest Bedrock security best practices for current security guidance

Converse API vs InvokeModel

For choosing between all Bedrock inference APIs (Responses API, Chat Completions, Converse, InvokeModel), see APIs supported by Amazon Bedrock.

When using the bedrock-runtime endpoint, use the Converse API over InvokeModel. It provides a unified request/response format across all models.

Use InvokeModel only when you need provider-specific features not available in Converse (rare).

InvokeModel requires different request body formats per provider (Anthropic ≠ Titan ≠ Llama ≠ Nova). Using the wrong format produces "Malformed input request". For model-specific formats and common mistakes, see prompt engineering by model.

Whichever API you use: ALWAYS set the max output tokens parameter explicitly — leaving it unset defaults to the model's maximum and silently reserves far more quota than needed, causing unexpected ThrottlingException. See Critical Warnings above and max_tokens quota mechanics.

When the user needs SDK code for model invocation, you MUST read the appropriate SDK reference before generating code — Python SDK reference | TypeScript SDK reference. Use the patterns from the reference file.

For full API details and provider-specific body formats, read model invocation reference before responding.

Which Bedrock Capability Do You Need?

Knowledge Bases (RAG)

When the user wants to create a Knowledge Base or build a RAG application, you MUST read KB setup procedure and execute it step by step. Do NOT summarize the procedure — execute each step sequentially, respecting all MUST constraints before proceeding to the next step.

When the user asks about chunking strategies, vector store selection, or other KB configuration choices, you MUST read KB setup procedure before responding — it contains the authoritative decision tables and constraints.

When the user wants to query an existing Knowledge Base, you MUST read KB retrieval reference before responding. Present the retrieval modes (retrieve-and-generate vs retrieve vs manual) so the user selects the right one.

Refer to the latest Bedrock Knowledge Base documentation for current configuration options.

Common Workflows

Execute commands using available tools from the AWS MCP server when connected — it provides sandboxed execution, audit logging, and observability. When the MCP server is not available, fall back to the AWS CLI or shell as needed.

Before starting any workflow:

Verify Dependencies

Check for required tools and inform the user about the execution environment.

Constraints:

• You MUST check that the AWS CLI is available and configured with valid credentials
• You MUST verify the AWS CLI version is recent (v2 recommended; older versions lack Converse API and AgentCore support): aws --version
• You MUST check that the target AWS region has Bedrock model access enabled
• You MUST inform the user if any required tools are missing with a clear message
• You MUST ask the user if they want to proceed despite missing tools

General constraints for all workflows:

• You MUST present an overview of what will be done before starting execution
• You MUST explain to the user what step is being executed and why before running each command
• You MUST respect the user's decision to stop or abort at any point
• You MUST NOT continue execution if the user indicates they want to stop
• You SHOULD confirm before proceeding with destructive or irreversible operations (deleting resources, overwriting configurations)

Examples — mapping user intent to workflows

Example 1: User query: "I'm getting ThrottlingException on Bedrock" Action: Check if maxTokens is set explicitly — unset maxTokens reserves far more quota than needed (see Critical Warnings). If already set, check current quota: aws service-quotas get-service-quota --service-code bedrock --quota-code <code> --region <region>

Example 2: User query: "Set up RAG for my PDF documents" Action: Follow the Create a Knowledge Base workflow. Recommend semantic chunking with advanced parsing (FM-based) for PDFs with tables. See KB setup procedure.

Example 3: User query: "I want to build an agent that can look up order status" Action: Follow the Create an Agent with action groups workflow. See agent creation procedure.

Example 4: User query: "How do I call Claude on Bedrock?" Action: Use the Converse API (not InvokeModel). Set maxTokens explicitly. Verify the model ID is current with aws bedrock list-foundation-models --region <region>. Use cross-region model ID with us. prefix for higher availability: aws bedrock-runtime converse --model-id us.anthropic.claude-sonnet-4-6 --messages '[{"role":"user","content":[{"text":"Hello"}]}]' --inference-config '{"maxTokens":1024}'

Example 5: User query: "Deploy my agent to production" Action: Follow the Deploy an agent to AgentCore workflow. Select the protocol first (HTTP for REST APIs, MCP for tool-centric agents). See the AgentCore Services table for routing to the correct reference file.

Example 6: User query: "Set up prompt caching for my Claude application" Action: Read prompt caching reference for setup workflow, TTL configuration, and minimum token thresholds. Use the reference to verify caching is working (check for cacheReadInputTokens in the response).

Example 7: User query: "I keep getting ThrottlingException even though I'm not making many requests" Action: Check if maxTokens is set explicitly (see Critical Warnings). Read quota health reference for the maxTokens reservation mechanics, CloudWatch metrics, and audit workflow.

Example 8: User query: "How do I track Bedrock costs by team?" Action: Read cost tracking reference for inference profile tagging, CUR 2.0 approaches, and Cost Explorer queries by model/region/tag.

Example 9: User query: "I'm upgrading from Claude 4.5 to 4.6, what breaks?" Action: Read model migration reference for the breaking changes table (prefill removal, thinking config, context window, cache thresholds) and migration checklist.

Invoke a model

- [ ] Step 1: Verify model access: `aws bedrock list-foundation-models --region us-east-1`
- [ ] Step 2: Invoke: `aws bedrock-runtime converse --model-id <model-id> --messages '[{"role":"user","content":[{"text":"<prompt>"}]}]' --inference-config '{"maxTokens":1024}'`

Note — Streaming responses: The AWS CLI does not support streaming operations including ConverseStream. Use the SDK (converse_stream() in boto3, ConverseStreamCommand in JS SDK).

Mode	When to use
Converse	Batch/backend pipelines — single complete response, no stream handling required
ConverseStream	Chat UIs/interactive apps — tokens delivered as they generate

Create a Knowledge Base

You MUST read KB setup procedure before responding. Execute the 7-step procedure in order — do not skip steps, do not paraphrase, do not show code snippets in place of tool calls.

Query a Knowledge Base

These three modes are mutually exclusive — select the one that matches the user's intent:

Create an Agent with action groups

You MUST read agent creation procedure before responding. Execute the procedure step by step. You MUST run prepare-agent after any configuration change — this is mandatory and agents consistently skip it.

Apply Guardrails

You MUST read guardrails reference before responding. Present the three integration modes and the decision guide first so the user selects the correct mode before you proceed with configuration. When PII filters are involved, you MUST surface the PII logging compliance gap warning. Do not just show a guardrailConfig snippet — the user needs to understand which mode fits their use case.

Deploy an agent to AgentCore

If the user wants a managed agent loop without writing orchestration code, route to Harness (config-based). Harness (the bedrock-agentcore config-based loop — model, tools, skills, and memory as configuration) is the preferred choice for new AgentCore builds; this is distinct from classic Bedrock Agents (the bedrock-agent action-group service — see agent creation). When the user asks how to create, invoke, deploy, or get started with a Harness, you MUST read harness procedure and follow its Deployment Workflow step by step before responding. Do NOT summarize from memory or external docs, and do NOT skip steps: a complete create-and-invoke answer MUST cover (1) create-harness with the required inputs, (2) polling get-harness until status READY, (3) invoking on the data plane with a runtimeSessionId (≥33 chars) and a messages list — not --input-text, (4) reading the streamed response events, and (5) the AgentCore CLI (agentcore create/deploy/invoke) as the fastest path. The reference is authoritative over any external documentation. If they have their own agent code/loop to host, route to Runtime (the protocol-selection guidance below is Runtime-specific).

Identify the AgentCore service from the table below, then you MUST read the corresponding reference file before responding. Follow any procedures in the reference step by step. Do not summarize — execute.

Set up or debug prompt caching

You MUST read prompt caching reference before responding. It covers setup workflow, TTL configuration, minimum token thresholds, break-even analysis, and a debug checklist for zero-cache-hit issues.

Constraints:

• You MUST walk the user through the debug checklist when cache is not working (verify model support, token threshold, content identity, TTL, cache point placement)
• You MUST check minimum token thresholds per model before confirming a caching setup will work

Check quota health

You MUST read quota health reference before responding. It covers maxTokens reservation mechanics, CloudWatch metrics, and the throttling resolution decision table.

Constraints:

• You MUST explain the relationship between maxTokens and quota reservation
• You MUST guide the user through comparing current limits vs peak usage using aws service-quotas and aws cloudwatch get-metric-statistics

Analyze Bedrock costs

You MUST read cost tracking reference before responding. It covers inference profile tagging, CUR 2.0 attribution, and AWS Budgets setup.

Constraints:

• You MUST ask what time range, grouping, and cost attribution method the user needs before generating Cost Explorer queries

Migrate between Claude generations

You MUST read model migration reference before responding. It covers breaking changes between Claude 4.5, 4.6, and 4.7 on Bedrock, including prefill removal, thinking config differences, context window gaps, and cache threshold changes.

Troubleshooting

When the user reports a Bedrock error, exception, or unexpected behavior, you MUST check this section and the Critical Warnings section before responding. Bedrock has service-specific root causes (e.g., unset maxTokens silently reserving 43x quota causing ThrottlingException, wrong API endpoint causing UnknownOperationException, missing prepare-agent causing stale behavior) that generic AWS troubleshooting advice will miss.

AccessDeniedException

Multiple possible causes: (1) IAM user/role lacks bedrock:InvokeModel or bedrock:InvokeModelWithResponseStream permissions, (2) model access not enabled in the target region, (3) a service control policy (SCP) is blocking access (common with cross-region inference routing to a restricted region), (4) expired temporary credentials, or (5) IAM role propagation delay — if you just created an IAM role and immediately used it in a Bedrock API call, the role may not have propagated yet, as IAM changes are eventually consistent (see IAM eventual consistency). Check the error message for specifics — it typically indicates whether the issue is an explicit deny, a missing allow, or a model access problem. See Resolve InvokeModel API errors for detailed resolution steps.

Malformed input request

Request body doesn't match the expected schema. Common causes: wrong provider-specific body format for InvokeModel (e.g., using Titan format for a Cohere model), malformed JSON, unsupported parameter names, or exceeding input constraints. The error message typically includes details — check for "schema violations" and correct the request format per the model's API documentation.

ThrottlingException

Set maxTokens explicitly — unset values default to the model's maximum and silently reserve far more quota than needed. Use adaptive retry mode. Use cross-region inference profiles (e.g., us., eu., apac., or global. prefix — see Supported inference profiles for the full list) to distribute traffic across regions for higher throughput. Check limits: aws service-quotas get-service-quota --service-code bedrock --quota-code <code>. Request quota increases if needed. For a deeper audit, read quota health reference.

Prompt cache not working (zero cacheReadInputTokens)

Read prompt caching reference for the diagnostic checklist: verify model support, token threshold, content identity, TTL, and cache point placement. Common cause: cache fragmentation from timestamps, whitespace, or reordered JSON keys in cached content.

400 error on prefill with Claude 4.6

Prefill was removed in Claude 4.6 and causes a hard 400 error. Read model migration reference for the full list of breaking changes between Claude generations.

Error retry classification

Use adaptive retry: Config(retries={"max_attempts": 5, "mode": "adaptive"}).

UnknownOperationException

Wrong client (using bedrock instead of bedrock-runtime), or SDK too old. Check the API landscape table above.

Agent returns stale behavior

Run prepare-agent after ANY configuration change. This is mandatory.

KB returns empty results

Run start-ingestion-job and wait for completion. Query before ingestion completes returns empty.

KB retrieval quality is poor

Review chunking strategy. Use advanced parsing (FM-based) for documents with tables. Configure metadata filtering.

Cross-region model not found

The model may not be available in the region you're calling from. Check availability at Supported foundation models. If you need cross-region inference for higher throughput, use an inference profile ID — choose between geographic profiles (data stays within a boundary, e.g. US, EU) or global profiles (any commercial region). The profile prefix is a data residency decision. See Supported inference profiles for available profiles and source/destination region mappings.

On-demand throughput isn't supported

Error: "Invocation of model ID with on-demand throughput isn't supported. Retry your request with the ID or ARN of an inference profile that contains this model." Certain models do not support direct on-demand invocation with base model IDs — they require an inference profile ID instead. Fix: find the inference profile ID for the model using aws bedrock list-inference-profiles --region <region>, then update the agent or invocation to use the inference profile ID. See Supported inference profiles for available profiles. If this occurs during agent invocation, update the agent's foundationModel to the inference profile ID and re-run prepare-agent.

KB storage configuration invalid

Verify OpenSearch data access policy includes Bedrock service role. Verify vector index field names match KB config.

Agent action group errors

Check Lambda permissions (resource-based policy for bedrock.amazonaws.com). Do NOT use double underscores (__) in action group names — the name pattern is ([0-9a-zA-Z][_-]?){1,100}.

Multi-agent supervisor loops

Agents use built-in collaboration mechanism, NOT action groups. Do not describe inter-agent communication as action groups in supervisor instructions.

INVALID_PAYMENT_INSTRUMENT on model access

Account billing issue, not Bedrock. Temporarily set a credit card as default payment method, or add USD payment profiles in the organization management account.

Knowledge base ingestion failures

Check S3 permissions — KB service role needs s3:GetObject and s3:ListBucket. Unsupported file formats are silently skipped. Files exceeding size limits are skipped without error.

SharePoint data source sync failures

Sync completes but files fail — most often an authentication problem. Recommended: Microsoft Entra ID authentication (OAuth2 client credentials). Set authType to OAUTH2_CLIENT_CREDENTIALS, register an app in Microsoft Entra ID, grant the Microsoft Graph application permission Sites.Read.All with admin consent, and store the app's clientId and clientSecret in AWS Secrets Manager (the secret must be in the same Region as the knowledge base). Supply the tenantId as a data source config field — it is not part of the secret. Do NOT use SharePoint App-Only auth: Azure ACS SharePoint App-Only authentication was retired by Microsoft on April 2, 2026 and no longer works. The older OAuth 2.0 delegated flow (SharePoint AllSites.Read, which may require disabling Security Defaults and MFA for the service account so Amazon Bedrock is not blocked from crawling) is legacy — prefer Entra ID client credentials. See the SharePoint connector docs for current requirements.

AgentCore Services

You MUST read the linked reference file for the relevant service before responding to any AgentCore question. Follow procedures in the reference step by step.

Model Selection

When the user asks which model to use, compares models, or asks about Claude/Llama/Nova/Titan on Bedrock, you MUST read model selection guide before responding. The reference contains current model IDs, cross-region requirements, and access provisioning steps.

Quick defaults (verify current availability: aws bedrock list-foundation-models --region <region>):

• General purpose: Claude Sonnet (best quality/cost balance)
• Fast + cheap: Claude Haiku or Nova Micro
• Embeddings for KB: Titan Embeddings V2
• Open-source / fine-tuning: Llama
• Image generation: Titan Image Generator

For current model IDs, regional availability, cross-region inference profiles, and supported features, refer to Supported foundation models in Amazon Bedrock. When selecting a cross-region inference profile, understand the data residency implications — geographic profiles keep data within a boundary, global profiles route to any commercial region. Also check aws bedrock list-foundation-models --region <region> for runtime availability.

For model ID formats (4 patterns), access provisioning, and selection criteria, see model selection guide.

Additional Resources

• Amazon Bedrock User Guide
• Amazon Bedrock API Reference
• Amazon Bedrock AgentCore User Guide
• Bedrock Pricing
• Bedrock Quotas and Limits
• Bedrock Supported Regions
• Bedrock Security Best Practices
• Prompt Caching Documentation
• Prompt Caching Code Samples
• Cost Allocation Tags Blog
• Bedrock Agents Classic Maintenance mode Announcement