Tutorials Intermediate
OpenAI 12h Cache: Split Agent Prompts Into Two TTLs
Use OpenAI's new 12-hour prompt cache for stable context, 30 minutes for the rest.
9 min read·Kodetra Technologies
13d agoGuides
AI Guides for Builders
How-to content for builders, indie hackers, and AI engineers. Less theory, more shipped code.
Tutorials 
Tutorials Intermediate
TanStack AI 1.0: Approval-Gated Agents in Plain Node
TanStack AI hit 1.0. Build an agent whose refund tool pauses for approval, edits and denials.
12 min read·Kodetra Technologies
17d ago
Tutorials Intermediate
Gemini 4 Argon Long Decode: 200K Tokens, One Request
Use Argon's background long decode to generate 1M tokens of output, with cost math.
9 min read·Kodetra Technologies
27d ago
Tutorials Intermediate
Agent Tool Broker: Identity, Audit Log, Kill Switch
Build an out-of-model tool broker in Python: per-agent identity, scoped policy, tamper-evident logs.
10 min read·Kodetra Technologies
28d ago
Tutorials Intermediate
Blocked Is an Alert: Egress Gates for Claude Agents
Build a Python egress gate that stops the four workarounds Anthropic saw Claude use on live sites.
12 min read·Kodetra Technologies
28d ago
Tutorials Intermediate
OpenAI Decisions API: Calibrate Thresholds on Labeled Data
Use /v1/decisions as a $0.10 guardrail, then sweep thresholds and escalate only the unsure band.
11 min read·Kodetra Technologies
Oct 9
Tutorials Intermediate
Reflection Beam: Get Agent-Ready Before the Weights Drop
Build an effort-routing tool-loop client for Beam's OpenAI-compatible API and size the self-host bill.
8 min read·Kodetra Technologies
Oct 6
Tutorials Intermediate
OpenAI Agents API: Run a Data Audit in a Cloud Sandbox
Run a durable Codex-powered agent in OpenAI's hosted sandbox with a custom tool and file outputs.
14 min read·Kodetra Technologies
Oct 1
Tutorials Intermediate
GPT-6.1 Sol Computer Use: Build a Browser Agent
Drive a real browser with GPT-6.1 Sol's batched computer tool, with guardrails.
8 min read·Kodetra Technologies
Sep 30
Tutorials Intermediate
Agent DNS Escape: Build a Tunnel Detector in Python
An OpenAI agent used DNS to reach the internet. Build an allowlist resolver and kill switch that catches it.
10 min read·Kodetra Technologies
Sep 29
Tutorials Intermediate
Sonnet 5.5 Drops tool_choice: Build a Strict Tool Router
Forced tool use now 400s on Claude Sonnet 5.5. Replace it with strict tools and a retry guard.
9 min read·Kodetra Technologies
Sep 28
Tutorials Intermediate
Grok 4.7 Stateless Agents: Replay Encrypted Reasoning
Build a store=false Grok 4.7 tool agent that keeps its reasoning, hits cache, and escalates effort.
13 min read·Kodetra Technologies
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