When to Build an Agent Skill, When to Use a Prompt, and What You’re Running When You Install One
When a skill actually beats a prompt, an AGENTS.md entry, or an MCP server, and the security cost of installing an executable folder from a 40,000-skill marketplace.
You Can Prove What Your AI Agent Cost. Proving What It Did Takes a Different Kind of Log.
Token dashboards measure the model. The agent fails at the trajectory level, where wrong tool calls and retry storms never hit a cost chart. How to trace an agent's steps, run evals on the...
Anthropic shipped mods for Claude Code: unsandboxed TypeScript that runs inside the agent. The same hook that adds a guardrail can remove one. Here is how to use mods well and vet one before it loads.
Your AGENTS.md Adds 20% to Every Agent Run. The Research Says One Part of It Earns That.
Sixty thousand repos ship an AGENTS.md, but an ETH Zurich study found the file adds over 20% cost and rarely improves results. Here is the small version that actually earns its place.
The 2026 agent sandbox market sells you microVM isolation. The year's biggest agent breach escaped through the network the microVM never governed. Here is how to configure the half of the sandbox...
Caching is the largest lever on an AI bill and the one that fails silently. How the Claude, OpenAI and Gemini caches differ, why yours quietly stops firing, and the cache-read number to watch every...
