MCP client manager: stdio + SSE transports, exp-backoff reconnect, server registry, built on @modelcontextprotocol/sdk

Deterministic graders + composers for the eval stack

Anthropic provider adapter + shared ProviderAdapter interface (Section 17)

Eval dataset loaders (JSONL, CSV, YAML, HTTP) with a lazy iterator API

OTLP/HTTP exporter for TraceEvent — gen_ai/* semantic conventions, 5s batch flush

Markdown-templated slash commands with $ARGUMENTS substitution

Composable PII redaction: regex + classifier + policy-driven detectors; replace and hash modes (Section 39)

OpenAI provider adapter (Section 17). Chat Completions streaming + function calls

LLM-backed goal decomposer for the RES target — checkpointed Plan with sub-questions (Section 23 RES)

Zustand-style in-process state container with referential-equality selectors

In-process trace event bus with ring-buffered history and W3C trace-context propagation

Exactly-once node execution wrapper over graph-engine — idempotency keys + crash-replay

Citation-tracker-backed crawler — HTTP fetch + file:// reads with URL-dedup, rate limiting (Section 23 RES)

Pre-permission input validation per tool using the tool's Zod schema

Codegen backend for workflow target (sequential multi-step agents)

Pure recovery taxonomy: classify Anthropic API errors into a RecoveryAction (compact/retry/continue/tombstone/fail)

Half-open circuit breaker that wraps a ProviderAdapter; refuses to stream while open so callers can route to their next candidate model

Append-only JSONL transcript log per session

File-backed checkpoint store for graph-engine — save/load/list/branch over per-graph-run JSON files

File-backed session metadata store with TTL eviction