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Production AI Agent Systems

Architecture, tools, memory, evaluation, security and deployment for AI Agents that must operate beyond a demo.

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OpenAI Zero Data Retention architecture for AI agents across Responses API, MCP, memory, audit and data residency - XBSTACK

OpenAI Zero Data Retention for AI Agents: Responses API, MCP and Data Boundaries

Ai
2026-08-20
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8 min
DeepSeek V4-Pro-0813 and DeepSeek Harness features, pricing, API setup, and agent architecture - XBSTACK

What Is DeepSeek V4-Pro-0813? API Pricing, Setup, and DeepSeek Harness Guide

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Google ADK 2.6.2 state_delta not applied to session.state when Runner.run_async resumes without new_message - XBSTACK

Google ADK Resume Bugs: state_delta Loss and the 2.7.0 A2A HITL Regression

Ai
2026-08-09
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OpenAI Responses API streamed function_call breaks at Stream Abort before Conversation commit and returns 400 No tool call found - XBSTACK

OpenAI Responses API: Why Stream Abort Causes No tool call found for function call output

Ai
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Two OpenAI Agents SDK FunctionTools named lookup are registered while local dispatch keeps only the later tool - XBSTACK

OpenAI Agents SDK Duplicate Tool Names: Why the Later Tool Wins

Ai
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Experiment showing a LangGraph streaming UI ahead of the authoritative SQLite checkpoint after cancellation - XBSTACK

LangGraph State Lost After Cancel: Why Streaming Output Disappears After Stop

Ai
2026-07-30
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15 min
MCP 2026-07-28 stateless migration with cross-replica session failure and explicit handles - XBSTACK

MCP initialize Removed: How Do You Replace Mcp-Session-Id in a Remote Server?

Ai
2026-07-28
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22 min
An AI Agent tool call entering a Policy Gate before allow, confirmation, step-up authentication, or block - XBSTACK

AI Agent Tool Authorization: Policy Gates, HITL, and Per-Call Access Control

Ai
2026-07-27
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An n8n AI Agent with connected tools branching to a skipped text response or a real tool execution - XBSTACK

n8n AI Agent Not Calling Tools: tool_choice, Provider Compatibility, and Memory

Ai
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Production architecture for resuming an OpenAI Agents SDK RunState Tool Approval across processes - XBSTACK

OpenAI Agents SDK Tool Approval Resume: RunState Across Processes and the v0.19.3 Streaming Fix

Ai
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Vercel AI SDK 7 interrupted streams, Cloudflare 524 boundaries, message persistence, and idempotent tool-call recovery - XBSTACK

Vercel AI SDK 7 Migration: Interrupted Streams, Cloudflare 524 Boundaries, and Tool-Call Recovery

Ai
2026-07-21
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AI Agent memory retrieval architecture with structured lookup, vector recall, re-ranking and prompt assembly - XBSTACK

AI Agent Memory Retrieval Architecture: Hybrid Search, Re-ranking, Freshness and Conflict Resolution

Ai
2026-07-16
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Division of labor and complete workflow for ChatGPT Work, Chat, and Codex in a real website task - XBSTACK

ChatGPT Chat vs Work: What’s the Difference? When to Use Codex

Ai
2026-07-13
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12 min
GPT-5.6 Tested in Real Projects, Content Creation, and Website Data Analysis - XBSTACK

GPT-5.6 Coding Review: Real Astro Project, GSC and GA4 Tests

Ai
2026-07-10
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19 min
Cover image for the Claude Sonnet 5 AI Coding Agent hands-on test optimizing oversized Astro website chunks - XBSTACK

Claude Sonnet 5 Hands-On: Full Process for Optimizing Oversized Astro Chunks

Ai
2026-07-08
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10 min
Diagram of the three-layer architecture of MCP, Function Calling, and API Gateway in AI Agent tool integration - XBSTACK

How to Configure MCP, Function Calling, and API Gateway: A Three-Layer Architecture for AI Agent Tool Integration

Mcp
2026-07-07
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9 min
Production Governance for AI Agents: Evaluation, Observability, Deployment, Cost Control, and Human-in-the-Loop: AI AGENT ENGINEERING article cover - XBSTACK

Production Governance for AI Agents: Evaluation, Observability, Deployment, Cost Control, and Human-in-the-Loop

Ai
2026-06-25
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12 min
AI Agent Protocol and Framework Selection: How to Choose Between MCP, Function Calling, A2A, LangGraph, AutoGen, and CrewAI?: AI AGENT ENGINEERING article cover - XBSTACK

AI Agent Protocol and Framework Selection: How to Choose Between MCP, Function Calling, A2A, LangGraph, AutoGen, and CrewAI?

Ai
2026-06-25
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AI Customer Operations Agents: Support, Ticketing, Email, CRM, Feedback, and Growth Loops: CUSTOMER OPERATIONS article cover - XBSTACK

AI Customer Operations Agents: Support, Ticketing, Email, CRM, Feedback, and Growth Loops

Ai
2026-06-25
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13 min
AI Developer Engineering Agents: Code Review, Issue Triage, Log Analysis, and Production Operations: DEVELOPER OPERATIONS article cover - XBSTACK

AI Developer Engineering Agents: Code Review, Issue Triage, Log Analysis, and Production Operations

Ai
2026-06-25
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13 min
AI Document Understanding Agents: PDF Parsing, RAG Knowledge Bases, Contract Review, and Research & Audit Evidence Chains: DOCUMENT INTELLIGENCE article cover - XBSTACK

AI Document Understanding Agents: PDF Parsing, RAG Knowledge Bases, Contract Review, and Research & Audit Evidence Chains

Ai
2026-06-25
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13 min
AI Finance Automation Agents: Governance Architecture for Expenses, Invoices, Procurement, Vendors, Contracts, and Audits: FINANCE AUTOMATION article cover - XBSTACK

AI Finance Automation Agents: Governance Architecture for Expenses, Invoices, Procurement, Vendors, Contracts, and Audits

Ai
2026-06-25
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14 min
AI Workflow Automation Production Deployment: n8n, Webhooks, Queues, Credentials, Security, and Cost Monitoring: AI WORKFLOW article cover - XBSTACK

AI Workflow Automation Production Deployment: n8n, Webhooks, Queues, Credentials, Security, and Cost Monitoring

Ai
2026-06-25
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11 min
AI Agent in E-commerce After-Sales: Order Inquiry, Refunds and Exchanges, Logistics Anomalies, and End-to-End Escalation Loop: CUSTOMER OPERATIONS article cover - XBSTACK

How to Build an AI E-commerce Support Agent

Ai
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12 min