Changelog

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All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

v0.2.0 (2026-07-03)

Changed

  • Bedrock AgentCore InvokeHarness now streams incrementally: turns are guarded by an inter-chunk idle_timeout (default 300s) instead of a 10-minute whole-body wall clock, so long-running turns complete while dead connections fail fast.
  • Handler.handle_event/2 fires live during AgentCore turns (previously only after the turn completed) and is documented as at-least-once across retried attempts.
  • Client.new's receive_timeout now governs control-plane calls only; the invoke data plane is guarded by the per-invoke idle_timeout instead (callers who used receive_timeout to cap invokes should now pass idle_timeout/timeout_seconds).

Added

  • Per-invocation AgentCore server budgets on Session.run/2 opts: timeout_seconds, max_iterations, max_tokens (wire: timeoutSeconds/maxIterations/maxTokens).
  • idle_timeout opt on the AgentCore invoke path.
  • [:req_managed_agents, :stream, :event] telemetry now also fires for AgentCore turns.

v0.1.0 (2026-07-03)

First public release. Provider-agnostic client for managed agent runtimes: the provider runs the agent loop; your custom tools execute locally on your node. The provider only ever sees each tool's name, description, input schema, and the text result you return.

Providers

  • ReqManagedAgents.Providers.ClaudeManagedAgents — Anthropic Claude Managed Agents (public beta, managed-agents-2026-04-01). :streaming transport over long-lived SSE.
  • ReqManagedAgents.Providers.BedrockAgentCore — AWS Bedrock AgentCore Harness (GA) via ConverseStream. :request_response transport over application/vnd.amazon.eventstream (decoded by aws_event_stream). The AWS dependencies (ex_aws_auth, aws_event_stream) are optional — Anthropic-only consumers don't pull them; AgentCore raises an actionable error at first use if they're missing.

Core

  • ReqManagedAgents.Provider behaviour — one canonical turn vocabulary across backends: custom_tool_use / custom_tool_result (client-executed, return-of-control tools only), a three-atom terminal (:end_turn | :requires_action | :terminated), and %TurnResult{} / %SessionResult{} with per-turn token usage.
  • Two drivers over the same vocabulary: ReqManagedAgents.run_to_completion/1 (synchronous) and ReqManagedAgents.Session (supervised GenServer; reconnect with event consolidation/deduplication, concurrent tool execution, full-history paging).
  • ReqManagedAgents.Handler behaviour for local tool execution; ReqManagedAgents.Provisioner for idempotent provider-side agent/harness provisioning and teardown.
  • Anthropic control plane: agents, environments, sessions, events, Files API (upload / attach / download).
  • Telemetry event tree ([:req_managed_agents, …] — request, stream, tool, session) with caller metadata injection, plus an optional OpenTelemetry bridge emitting gen_ai.* spans.

Hardening (validated against live provider APIs)

  • AgentCore ConverseStream tool blocks keyed by toolUseId (robust to index-reuse in live streams); resume turns carry both the assistant toolUse and user toolResult messages, as the harness requires.
  • Exception/error stream frames surface as distinct errors rather than silent terminals; bounded per-turn invoke retry on transport errors and truncated streams.
  • SigV4 signing is session-token aware (works with STS/OIDC temporary credentials).
  • Client structs redact secrets from inspect/1 output (api_key, AWS credentials) — a KeyError from missing session opts or a crash report can't leak them into logs.