Auto-Compaction (Bedrock)

examples/compaction-bedrock.rs demonstrates enable_auto_compaction end to end on AWS Bedrock. It mirrors the direct-Anthropic compaction example, but appam sends the compaction beta as an anthropic_beta entry in the request body (Bedrock does not use the HTTP header) and parses the compaction block from Bedrock's EventStream binary framing.

Bedrock currently documents compaction support for Claude Sonnet 4.6 and Claude Opus 4.6, on the InvokeModel / InvokeModelWithResponseStream paths that appam uses.

Run

export AWS_ACCESS_KEY_ID="..."
export AWS_SECRET_ACCESS_KEY="..."
export AWS_REGION="us-east-1"                                # optional
export AWS_BEDROCK_MODEL_ID="us.anthropic.claude-sonnet-4-6" # optional
cargo run --example compaction-bedrock

What this example actually configures

• LlmProvider::Bedrock with SigV4 auth and model us.anthropic.claude-sonnet-4-6
• enable_auto_compaction(50_000) — the Anthropic minimum trigger
• One local tool: fetch_archive (~16K tokens per volume)
• An on_compaction stream hook and a post-run verification report

Key builder setup

let agent = AgentBuilder::new("compaction-demo-bedrock")
    .provider(LlmProvider::Bedrock {
        region: region.clone(),
        model_id: model_id.clone(),
        auth_method: appam::llm::anthropic::BedrockAuthMethod::SigV4,
    })
    .system_prompt("You are an expedition archivist. ...")
    .enable_auto_compaction(50_000)
    .with_tool(Arc::new(fetch_archive()))
    .max_tokens(4096)
    .build()?;

See the Context Compaction guide for how compaction works across providers.