Production AI Agent Systems

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

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Context engineering routes system instructions, user tasks, retrieval, memory, tools, state and compacted history into an AI agent to produce grounded answers, completed tasks and lower context cost - XBSTACK

What Is Context Engineering? Reducing AI Agent Cost with Retrieval, Tool Search and Memory

Ai
2026-09-04
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GPT-6 Astra API English cover showing pricing, 1.05M context, 128K output and Responses API migration - XBSTACK

GPT-6 Astra API Guide: Pricing, Claude/Gemini Comparison, 1.05M Context and Migration

Ai
2026-09-04
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Gemini 3.8 Flash versus 3.7 Flash for coding, agents, pricing and per-task token cost - XBSTACK

Gemini 3.8 Flash vs 3.7 Flash: Same Price, Different Agent Cost?

Ai
2026-09-03
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Claude Fable 5.1 vs Mythos 5.1 comparison of pricing, access, coding, and agent use cases - XBSTACK

Claude Fable 5.1 vs Mythos 5.1: Pricing, Access, Coding, and Agent Trade-offs

Ai
2026-09-02
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llms.txt v2 agent discovery with alternate, describedby, and Markdown pages - XBSTACK

How to Configure llms.txt v2: rel=alternate, describedby, and Markdown Discovery

Ai
2026-08-31
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MCP configuration security review for secrets, shell, remote MCP, and permissions - XBSTACK

How to Security-Check an MCP Configuration: Secrets, Shell, Remote MCP, and Permissions

Ai
2026-08-31
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WebMCP on Chrome 149 with forms, tool schemas, and registerTool - XBSTACK

How to Add WebMCP to a Website: Chrome 149 Forms, Tool Schemas, and registerTool

Ai
2026-08-31
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4 min
LangGraph aupdate_state raising Ambiguous update after a START seed while synchronous update_state succeeds - XBSTACK

LangGraph aupdate_state 'Ambiguous update': Why Async Fails When update_state Works

Ai
2026-08-26
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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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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

Ai
2026-08-15
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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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7 min
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
2026-08-05
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13 min
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
2026-08-03
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9 min
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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16 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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7 min
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
2026-07-26
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7 min
Production architecture for resuming an OpenAI Agents SDK RunState Tool Approval across processes - XBSTACK

OpenAI Agents SDK RunState: How to Resume Tool Approval Across Processes

Ai
2026-07-24
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18 min
Vercel AI SDK 7 interrupted streams, Cloudflare 524 boundaries, message persistence, and idempotent tool-call recovery - XBSTACK

Vercel AI SDK 7 Migration: Tool Calls, WorkflowAgent Approval, and Stream Recovery

Ai
2026-07-21
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25 min
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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15 min
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 Review: Real Coding, Content and Data 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