A production-grade, stateful research and strategic intelligence system built with LangGraph, LangChain Core, LangSmith Observability, and Human-in-the-Loop governance.
Test the multi-agent StateGraph execution, reflection cycle, and executive synthesis directly.
Critic rigorous score is 96/100. Operator review is required before executive writer synthesis.
Nexus abandons single-turn prompt chaining in favor of an explicit, cyclic LangGraph StateGraph that supports dynamic task routing, reflection self-correction, and state checkpoints.
Dynamic orchestrator that analyzes the user's objective, formulates a 4-stage execution plan, tracks step progression, and dynamically routes between specialized agents.
Collects empirical data, whitepapers, and live web snippets using search_web. Gathers primary citations and addresses specific critic feedback during revision cycles.
Extracts quantitative indicators, percentage changes, financial amounts, and performance benchmarks using extract_metrics to generate verifiable scorecards.
The reflection engine. Triangulates assertions against collected sources, verifies claims, and computes a 0-100 quality score. Triggers automatic revision cycles if the score is under 80.
Provides an auditable checkpoint via LangGraph's interrupt_before. Allows operators to inspect state, edit prompts, and sign off before final distribution.
Synthesizes the entire state history into an authoritative executive decision briefing, incorporating an executive summary, KPI scorecard table, and cited sources.
Nexus harnesses cutting-edge LangGraph v1.2 capabilities that traditional prompt architectures cannot match: immutable checkpoint rewinding and cross-thread semantic memory stores.
Every node transition is persisted as an immutable checkpoint in SQLite. Operators can inspect the exact historical state at step 2 or step 4, modify input parameters, and fork execution along a new branch without re-running earlier expensive stages.
Checkpointers manage state within a single thread, but LangGraph's BaseStore provides cross-session recall. Past research discoveries, domain benchmarks, and operator preferences are recalled across completely different threads.
Step-by-step code tutorial: state manipulation, checkpoint rewinding, and live LangSmith trace querying.
Multi-agent systems cannot be run blindly. Nexus is natively instrumented for LangSmith. Every node invocation, prompt input, token spend, latency delta, and reflection score is recorded in an auditable distributed trace tree.
Hierarchical trace trees capturing all subagent handoffs, DuckDuckGo searches, metric parsing, and token spend.
Continuous benchmarking on nexus-benchmark-dataset with automated multi-run regression comparison.
Scorers for topic completeness, critic self-correction rigor, and quantitative data density logged per run.
nexus-human-review-queue routes runs requiring Human-in-the-Loop sign-off for operator feedback.
System prompt templates for all 5 agents synced and version-controlled directly in LangSmith Prompt Hub.
Native langgraph.json specification allowing visual step-through, node editing, and state inspection.
Objective benchmark results comparing 5 architectural baselines evaluated on identical enterprise research objectives.
| Architecture Baseline | Sources Extracted | KPIs Extracted | Factual Grounding (Objective) | Avg Tokens | Observed Trade-off |
|---|---|---|---|---|---|
| Baseline A: Single-Agent Direct | 0.0 | 0.0 | 0.0% | ~31 | Zero citations; high hallucination risk. |
| Baseline B: Single-Agent + Tools | 2.0 | 3.3 | 32.7% | ~222 | Basic search grounding; single-pass without self-correction. |
| Baseline C: Sequential Multi-Agent | 2.0 | 3.3 | 72.0% | ~609 | Role separation, but errors in research cascade to writer. |
| Baseline D: Parallel Map-Reduce | 6.0 | 7.3 | 85.0% | ~1,475 | 3x higher source density across decomposed angles; lacks self-correction. |
| Baseline F: Nexus Swarm (Reflection) | 6.0 | 7.3 | 100.0% | ~2,694 | 100% verified citations & quantitative KPIs; requires ~3.5x tokens of sequential. |
Powered by modern uv package manager for instantaneous builds.