Agentic Architectures Dec 6, 2025

Architecting Agentic AI: Why 17 Patterns Matter

Modern AI systems are no longer a single monolithic model. They are orchestrations of tools, agents, critics, and feedback loops. Khan’s catalog of 17 agentic patterns gives builders the shared vocabulary to assemble these pieces with intention. Here’s how to use that lens to ship resilient, adaptive systems.

Why patterns matter

Patterns force clarity. Instead of improvising bespoke agent stacks each time, you can reference proven coordination templates: ensembles for resilience, Tree of Thoughts for exploration, reflexive critics for self-checks, or orchestration layers for adaptivity. Shared language accelerates design reviews, debugging, and stakeholder buy-in.

Treat the 17 patterns as LEGO bricks. Mix, extend, and remix them depending on complexity, risk tolerance, and compute budgets. The goal is architectural discipline, not dogma.

Quick Lens

  • Start with a base pattern that matches problem scope, then layer critics or reflexive loops only where failure is costly.
  • Instrument every hand-off; opacity grows exponentially with each agent hop.
  • Compute is a product requirement. Budget tokens, latency, and fallback behavior before launch.

Major Agentic Patterns at a Glance

Khan outlines 17 motifs. Below are seven foundational ones you’ll reach for first—complete with intuition, strengths, and risks.

Pattern Core Idea Strengths Risks
Multi-Agent System Specialized agents collaborate or hand off tasks via shared tools. Modularity, parallel work, reusable components. Coordination overhead, complex messaging contracts.
Ensemble Decision Multiple agents propose answers; a voter aggregates the best. Robustness, diversity, natural fit for A/B comparisons. Requires trustworthy scoring logic, higher latency.
Tree of Thoughts Branch reasoning into multiple paths, evaluate, then prune. Deeper exploration, creative leaps, less greedy search. Token explosion without heuristics; needs guardrails.
ReAct Loop Interleave reflection (“think”) and tool calls (“act”). Great for sequential decisions and live tool use. May loop without progress; requires intervention triggers.
Meta-Control An orchestrator agent assigns subgoals or swaps policies. Dynamic adaptability, clear separation of concerns. Controller becomes single point of failure; hard to tune.
Reflexive Self-Assessment Agents estimate uncertainty, flag gaps, or retry proactively. Safer outputs, audit trail for regulators. Can spiral into analysis paralysis without thresholds.
Critic / Reviewer Dedicated reviewer agents evaluate, red-team, or rewrite. Catch regressions, codify organizational quality bars. Requires termination rules; critics can disagree endlessly.

When to Reach for Each Pattern (or Blend Them)

Anchor to Problem Complexity

Simple tasks? Start with a single agent or lightweight ensemble. Multi-stage workflows like underwriting or pharma diligence demand orchestrators and selective Tree-of-Thought exploration.

Budget Compute Like a Product Manager

Set hard caps on branches, retries, and critic passes. Build dashboards that show tokens spent per stage so you can prune aggressively without losing coverage.

Design for Robustness and Auditability

Healthcare, finance, or safety-critical domains benefit from reflexive loops, dual reviewers, or failover ensembles. Record confidence scores and rationales for every hop.

Mix Patterns Thoughtfully

  • Orchestrator decomposes the request → hand off to specialist agents.
  • For each subtask, run an ensemble to surface diverse answers.
  • Route the winner through a critic; low confidence triggers a Tree-of-Thought re-run.
  • Loop the orchestrator back in when critics stall or deadlines near.

Implementation Advice & Pitfalls

Keep Interfaces Surgical

Define JSON contracts or typed events for every hand-off. The clearer the schema, the easier it is to swap agents, throttle retries, or stage migrations.

Debug Tip: Log both input and output schemas. Use schema drift alerts to catch regressions before they cascade.

Instrument Relentlessly

Multi-agent systems fail silently. Ship dashboards that show agent hop counts, critic pass rates, and average token spend per loop.

Control Feedback Loops

Critic chains and reflexive reviewers can oscillate forever. Add max iteration caps, decaying confidence scores, or human-in-the-loop interrupts.

Test Adversarially

Deliberately sabotage an agent to see whether ensembles, critics, and orchestrators recover. Reliability is a team sport.

Why the Pattern Lens Unlocks Momentum

Shared Vocabulary: Teams can say “ensemble + critic + orchestrator” and instantly picture the flow. Less ambiguity, faster design decisions.

Reusability: Once you build a killer summarizer or evaluator, you can redeploy it anywhere the pattern reappears.

Scaling: As agent counts grow, pattern awareness helps you anticipate load, failure modes, and governance needs.

Education: New teammates learn your system faster when it maps to recognizable archetypes.

Open Questions I'm Tracking

Scalability vs. Interpretability

Richer pattern stacks often blur causality. Expect more work on traceability standards and agent-level provenance.

Safety Guarantees

How do we certify a system that lets autonomous agents self-repair? Formal methods and constraint-checking critics are early answers.

Pattern Selection Automation

Meta-controllers that choose the right architecture for each request remain mostly manual. Expect meta-learning breakthroughs here.

Emergent Behavior

Large agent networks can manifest unexpected politics. Simulations and sandboxed rehearsals are becoming mandatory.