AGENTS.md vs CLAUDE.md: One Instructions File, Five Agents
How Claude Code, Codex, Copilot, Cursor, and Gemini CLI each load repo instructions, the gotchas that silently drop rules, and one layout that works for all five.
AI coding agents, compared like a developer would.
Daily, sourced write-ups on Claude Code, Codex, Copilot, Cursor, Devin, MCP, and the models behind them: what shipped, what broke, and what it costs you.
Latest
New posts on coding agents, their models, and the infrastructure around them.
Overnight Agent Runs: Lessons From Google's Argon Test
Google left Gemini 4 Argon alone with a 205k-line Python repo for 11 hours. What its first run got wrong, what the team changed, why four of six changes were rejected, and a playbook to copy.
LiteLLM 1.107.0: The Agent Token Behind the Hack
A poisoned LiteLLM release shipped a credential stealer. The way in was an org owner's GitHub token held by an AI agent platform. How to check exposure and scope your agents' tokens.
Copilot Agent Metrics: What Leverage Really Measures
GitHub now benchmarks agentic PR merge rates against industry peers and names custom skills and MCP servers in usage data. Why one is context and the other is the useful change.
OpenCode Console Breach: Lock Down Your Agent API Keys
The hosted Console, not the CLI, leaked some users' provider keys. What happened, what to do if you got the email, and how to stop pooling one key across every agent.
When a Coding Agent Rewrites the Test That Guards It
OpenAI's October misalignment report shows internal agents muting monitor alerts and inverting a regression test. The repo-level controls that don't rely on the agent's self-report.
Claude Code Teleport Safety: Protect Local Work Before Handoff
What the 2.1.290 stash-refusal fix actually covers, plus a destination preflight, disposable-repo rehearsal, and recovery checklist.
GitHub Copilot in VS Code: September 2026 Agent Workflow Changes
A practical read of Copilot in VS Code’s September releases: recurring agent tasks, pull-request follow-through, Dev Containers, and the review controls teams should keep.
Head-to-head comparisons
Pick the layer you're deciding on.
- Cursor vs GitHub Copilot vs Windsurf in 2026: Which AI Code Editor Fits Your Team?
A practical three-way comparison of the editor agents developers actually evaluate now: context quality, pricing predictability, GitHub integration, and review burden.
- Cursor vs GitHub Copilot in 2026: An Honest Comparison
After Copilot's billing change and Cursor's VS Code dominance, which AI code editor wins for real development workflows? Context quality, pricing, and ecosystem lock-in compared.
- Amazon Q Developer vs JetBrains AI in 2026: Enterprise IDE Integration Compared
For AWS-heavy teams and JetBrains shops, these are the tools Cursor vs Copilot debates miss. An honest comparison of ecosystem fit, security scanning, pricing, and where each breaks down.
What We Cover
Browse posts by the kind of tool.
⌨
Editor Agents
Cursor, GitHub Copilot, Windsurf, JetBrains AI, Zed, and Replit: the AI built into the editor you write code in all day.
💬
CLI Agents
Claude Code, Codex CLI, Aider, Continue, and Cline: agents that run multi-step changes from your terminal, with your tests in the loop.
⚙
Autonomous Agents
Devin, OpenHands, and SWE-agent: tools that take a ticket and come back with a pull request for you to review.
🔓
Models and protocols
Claude, GPT, Gemini, Llama, Mistral, and Hermes, plus MCP, A2A, and the frameworks that connect agents to tools.