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Coding agents

Coding agents are AI systems that take a software task, such as fixing a bug or adding a feature, and carry it out over many steps: reading code, editing files, running commands and tests, and returning a change for review. This page covers how they work, how they are measured and where they fail.

51 stories · updated Oct 9
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Checked Oct 9
Canonical agent vs workflow definition
Anthropic, "Building effective agents," December 19, 2024

Latest on Coding agents

Developers · NewsGitHub Copilot can now drive your desktop apps: what computer use does and how to turn it onComputer use reached public preview on October 1 in Copilot CLI and the Copilot app on macOS and Windows. What it does, what it costs, and the risks GitHub flags.·6 min readAgents · AnalysisThe case against unattended agents: what went wrong, and how sandboxing actually worksFrom a deleted production database to poisoned npm releases, documented agent failures share a pattern. Here's what the sandboxes in Claude Code, Codex and Copilot actually enforce.·9 min readAgents · BenchmarksSWE-bench, Terminal-Bench and METR: what coding-agent evaluations measure, and what their results don't proveOpenAI dropped SWE-bench Verified, Terminal-Bench is on version 4.0, and METR can't yet pin down AI's effect on developer speed. What published evaluations show, and their limits.·8 min readAgents · CompareClaude Code vs Codex vs Cursor: features, prices and limits compared (October 2026)All three now run in the terminal, the IDE and the cloud. The real differences are how they meter usage, how they sandbox commands, and which models you get. Verified against official pages.·Checked Oct 9Products · ExplainerChatGPT agent mode, explained: what it was, why it's gone, and what ChatGPT Work does insteadOpenAI's help center says ChatGPT agent is no longer available. ChatGPT Work, a cloud browser and dots now do its job. Here's how they work.·7 min readAgents · ExplainerOpenAI Codex explained: where it runs, which models and limits you get, and how its sandbox worksWhat Codex is in October 2026, from OpenAI's docs and pricing pages: where it runs, which plans get which models, how far the allowance goes, and what its sandbox enforces.·7 min readAgents · ExplainerClaude Code mods, explained: what Anthropic's new extension layer can do, where it runs, and the security trade-offSince October 1, 2026, Claude Code can load JavaScript and TypeScript 'mods' that redraw its interface, rewrite prompts and approve tool calls. What Anthropic's docs say they can do, and what they can reach.·8 min readDevelopers · GuideBuild your first agent with the Claude Agent SDK (TypeScript, October 2026)Install @anthropic-ai/claude-agent-sdk, call query(), lock down tools and permission modes, add a custom MCP tool and a safety hook, and cap spend. Code type-checked against v0.3.293.·7 min readDevelopers · GuideHow to write a CLAUDE.md or AGENTS.md file that coding agents actually followWhere each agent looks for its instructions, how long the file should be, what to put in it, and how to check the agent is reading it, from Claude Code, Codex, Cursor and Copilot docs.·10 min readAgents · ExplainerWhat "agentic" really means in 2026Every AI product now calls itself agentic. Here's the definition the labs themselves use, how the tool loop works, and how to tell a real agent from a relabeled chatbot.·6 min read

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