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xn

Full-stack developer and independent builder behind XBSTACK, focused on Web, iOS, Android, cross-platform apps, AI engineering, agents, MCP, LangGraph, automation, and production reliability.

Joined Joined on  Personal website https://www.xbstack.com/ github website

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Full-stack Web, iOS and Android Developer at XBSTACK

AI Security Is Entering the Agent Era: From Jailbreaks to Real-World Action Risk
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AI Security Is Entering the Agent Era: From Jailbreaks to Real-World Action Risk

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7 min read
OpenAI Agents API vs Agents SDK vs Responses API: Who Should Own the Agent Loop?
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OpenAI Agents API vs Agents SDK vs Responses API: Who Should Own the Agent Loop?

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15 min read
Google ADK delete_session() Does Not Delete Long-Term Memory: 2.8.0/2.9.0 Reproduction
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Google ADK delete_session() Does Not Delete Long-Term Memory: 2.8.0/2.9.0 Reproduction

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7 min read
n8n Slack Daily Digest Bot: Send a Daily API Digest to Slack
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n8n Slack Daily Digest Bot: Send a Daily API Digest to Slack

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8 min read
Why Codex CLI Turns response.failed Into idle timeout waiting for SSE: Reproduced on 0.15…
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Why Codex CLI Turns response.failed Into idle timeout waiting for SSE: Reproduced on 0.15…

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6 min read
LangGraph Resume Skips the Downstream Node After a Conditional Router Exception: 1.2.11 R…
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LangGraph Resume Skips the Downstream Node After a Conditional Router Exception: 1.2.11 R…

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10 min read
OpenAI Is Testing Outcome-Based Pricing: What It Changes for AI Agent Economics
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OpenAI Is Testing Outcome-Based Pricing: What It Changes for AI Agent Economics

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12 min read
Funes Agent Memory Tested: Codex Recall, Stale Memory, and Local Privacy Boundaries
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Funes Agent Memory Tested: Codex Recall, Stale Memory, and Local Privacy Boundaries

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12 min read
LangGraph Checkpoint Loses ZoneInfo and fold: Reproducing a One-Hour DST Shift
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LangGraph Checkpoint Loses ZoneInfo and fold: Reproducing a One-Hour DST Shift

#langgraph #python #ai #programming
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3 min read
LangGraph First Checkpoint Crash: Why an Accepted Run Can Disappear
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LangGraph First Checkpoint Crash: Why an Accepted Run Can Disappear

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8 min read
LangGraph Multi-Agent Collaboration in Practice: Designing Supervisor, Worker, and State …
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LangGraph Multi-Agent Collaboration in Practice: Designing Supervisor, Worker, and State …

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

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12 min read
GPT-6 Astra API: Pricing, 1.05M Context, Responses API Migration, and Claude/Gemini Tradeoffs
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GPT-6 Astra API: Pricing, 1.05M Context, Responses API Migration, and Claude/Gemini Tradeoffs

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

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8 min read
Claude Fable 5.1 vs Mythos 5.1: Same Model, Different Access Boundary
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Claude Fable 5.1 vs Mythos 5.1: Same Model, Different Access Boundary

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2 min read
MCP StreamableHTTPClientTransport POST Stays Pending After SSE Disconnect: Issue #2739 Re…
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MCP StreamableHTTPClientTransport POST Stays Pending After SSE Disconnect: Issue #2739 Re…

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

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4 min read
How to Test an MCP Server Before Production: Read-Only Inspector Preflight
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How to Test an MCP Server Before Production: Read-Only Inspector Preflight

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

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

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4 min read
n8n Execution Stuck Running After Success: Zombie Execution When Successful Runs Are Not …
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n8n Execution Stuck Running After Success: Zombie Execution When Successful Runs Are Not …

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6 min read
n8n Code Node 'Task request timed out': Fix 'Not Matched to a Runner'
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n8n Code Node 'Task request timed out': Fix 'Not Matched to a Runner'

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10 min read
OpenAI Assistants API Migration: Why Responses API Should Be Your New Architecture
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OpenAI Assistants API Migration: Why Responses API Should Be Your New Architecture

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1 min read
OpenAI Zero Data Retention for AI Agents: What ZDR Does—and Does Not—Cover
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OpenAI Zero Data Retention for AI Agents: What ZDR Does—and Does Not—Cover

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9 min read
n8n 2.35.3: Why $json.data.sort() Returns null
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n8n 2.35.3: Why $json.data.sort() Returns null

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7 min read
n8n HTTP Request Returns a Stream Object with Raw Body + JSON Response
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n8n HTTP Request Returns a Stream Object with Raw Body + JSON Response

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6 min read
DeepSeek V4-Pro-0813 + Harness: The Model Is Only Half the Story
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DeepSeek V4-Pro-0813 + Harness: The Model Is Only Half the Story

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11 min read
ChatGPT Work vs Codex: Route the Task Before You Pick the Tool
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ChatGPT Work vs Codex: Route the Task Before You Pick the Tool

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2 min read
Google ADK state_delta Not Applied on Resume: Runner.run_async Reproduction and Workaround
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Google ADK state_delta Not Applied on Resume: Runner.run_async Reproduction and Workaround

#ai #python #programming #opensource
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7 min read
OpenAI Responses API Stream Abort: Fix No tool call found
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OpenAI Responses API Stream Abort: Fix No tool call found

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14 min read
OpenAI Agents SDK Duplicate Tool Names: Why the Later Tool Wins
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OpenAI Agents SDK Duplicate Tool Names: Why the Later Tool Wins

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9 min read
Why LangGraph State Disappears After Run Cancellation: Streaming, Checkpoints and Recovery
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Why LangGraph State Disappears After Run Cancellation: Streaming, Checkpoints and Recovery

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17 min read
MCP initialize Removed: Reproducing Unknown MCP Session Across Replicas
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MCP initialize Removed: Reproducing Unknown MCP Session Across Replicas

#api #architecture #backend #mcp
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2 min read
AI Agent Tool Authorization: Build a Policy Gate Before Tool Execution
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AI Agent Tool Authorization: Build a Policy Gate Before Tool Execution

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8 min read
n8n AI Agent Not Calling Tools: The Request Contract Behind tool_choice
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n8n AI Agent Not Calling Tools: The Request Contract Behind tool_choice

#agents #ai #debugging #llm
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1 min read
OpenAI Agents SDK RunState: Resume Tool Approvals Without Duplicate Side Effects
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OpenAI Agents SDK RunState: Resume Tool Approvals Without Duplicate Side Effects

#python #ai #openai #architecture
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4 min read
AI SDK 7 Migration: The Production Breakages a Codemod Cannot Fix
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AI SDK 7 Migration: The Production Breakages a Codemod Cannot Fix

#ai #production #softwareengineering #typescript
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8 min read
I Tested Kimi K3 on a Real Astro Codebase: Strong Cross-File Analysis, Unsafe First Fix
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I Tested Kimi K3 on a Real Astro Codebase: Strong Cross-File Analysis, Unsafe First Fix

#agents #ai #llm #programming
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5 min read
GPT-5.6 Real-World Test: What Changed in an Astro, Content, and Analytics Workflow
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GPT-5.6 Real-World Test: What Changed in an Astro, Content, and Analytics Workflow

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21 min read
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