Version coding-agent system prompts in Bedrock Prompt Management: publish from CI, pin versions per environment, render safely, and A/B test.

You fine-tuned a coding model on your house style and unit-test quirks — then someone asks you to run a GPU cluster forever. Amazon Bedrock Custom Model Import lets you bring compatible fine-tuned weights into Bedrock and invoke them with the same Converse/Invoke APIs your agents already use. Distinct from Provisioned Throughput, Model Evaluation, Intelligent Prompt Routing, and Prompt Management: this is importing custom weights into Bedrock, not buying capacity or scoring outputs.

On-demand Bedrock is fine until your coding-agent P95 spikes during standup demos and CI review bursts. Amazon Bedrock Provisioned Throughput reserves model capacity so latency SLOs stop depending on the regional on-demand pool. Distinct from Intelligent Prompt Routing (which picks a model) and Model Evaluation (which scores outputs): Provisioned Throughput is about guaranteed capacity and predictable inference latency for the models you already chose.

Not every coding-agent call needs your most expensive foundation model. Amazon Bedrock Intelligent Prompt Routing automatically sends easy prompts to cheaper/faster models and hard ones to stronger models — cutting token spend and latency without hand-rolled classifiers. Distinct from Prompt Management versioning and Model Evaluation scoring: routing decides which model serves each request at inference time.

Amazon Bedrock Evaluations for coding agents: bring-your-own-inference judge jobs, built-in and custom metrics, RAG recall@k and citation fidelity, regression gates and Prompt management versions.

Build a Bedrock knowledge base over a monorepo: export code as Markdown, add metadata, sync from CI, and retrieve with filters in a Converse tool loop.

Multi-turn coding agents drown in Redis keys and lose "what we tried last hour" across sessions. OpenSearch Serverless vector search gives semantic scratch memory — embed tool outcomes and file summaries, retrieve by meaning, TTL with index lifecycle — without running your own OpenSearch cluster.

Bedrock Prompt Flows (Flows) let you visually wire plan → retrieve → generate → validate coding pipelines with versioned nodes — without standing up ASL on day one. Know when Flows win for prompt iteration vs when Step Functions + Converse remain the production orchestrator for tool graphs, human approval, and long runs.

This senior-level guide covers Bedrock ApplyGuardrail API with production trade-offs for reliability, security, and cost.