How to choose an agent harness for your workload
Your agent harness is an architectural decision that directly dictates task success and API costs. Here is how to match it to your workload.
When to use DeepSeek-V4.1-Flash
Field-test, Max effort, private repo to 512k. Reading 60/64 each. Kimi 8/8 vs DeepSeek 7/8 repairs. Bill $1.70 vs $31.75
What Belongs in AGENTS.md, Design Docs and Tests?
Why agent instructions accumulate and how to decide what to keep, move, or remove.
System One models are carving out a new layer in the AI stack
TypeSafe's Jev returns a typed answer in 70 to 500 ms at $0.042 per million input tokens, with no metered output-token cost
How to Run Qwen 3.8 27B as a Local Coding Agent
Pick a file, an engine, and a harness for your Mac RAM. Install steps live in an interactive HTML page
How to Review Your Vibe Coded App Before Deployment
METR’s API key theft shows why you must check authentication, credential access, and permissions before deployment.
Understanding the “Harness Tax” Behind Coding Agents
21 combos, 60 tasks, 5x cost swing, and a 4-tool harness on the Pareto frontier
What DeepSeek-V4.1-Flash teaches us about efficient AI
A 552B model with 890-byte KV cache, 8B active on input, and an Artificial Analysis 40 versus Gemini 3.8 Flash High at 41
Self-Improving AI Skills Learn in the Notebook, Not the File
Google's WikiSkill paper gained 15 points of accuracy from a notebook its agent couldn't read, and its skills still need a transfer test
Claude Prompt Caching: 6 Tricks That Cut Your API Bill
Breakpoints, TTL math, Batch stacking, and a two-session split. Measured on OpenRouter, $0.003 vs $0.022 per turn
When to Gate Recursive Terminal-task Synthesis
Mark each agent job Promote, Hybrid, or Reject. RST is allowed only when the job is hermetic, bounded, reproducible, and outcome-verifiable
What Developers Can Learn From Shopify’s Self-Improving AI Pipeline
Fine-tuned 0.8B Qwen beat GPT-5.6 Sol xhigh, 2 million buyer profiles a day became 72 million, and GraphQL serving fell from $27 million to $1 million
Coding Agent Cost: Why Sessions Get Expensive
Keep the project on disk, treat lunch as a bill, and score the first finished tasks rather than dollars per million tokens
Rebuilding the Runtime: What NVIDIA NOOA Reveals About Agent Frameworks
Its object-oriented model clarifies the trade-off between live program state and durable runtime control.
Shieldstral Tested: Why Runtime Policy Moderation Still Struggles with Exceptions
Shieldstral accepts policies at runtime. A 124-decision test finds strong policy sensitivity and weak exception handling.
What a Week of AI Security Incidents Means for Developers
Seven practical shifts for securing agents that can find any crack