Moving to Sonnet 5.5? Four requests that now return a 400
Same price as Sonnet 5, faster, and better at agentic coding by Anthropic's numbers. But the API breaks in ways a model-ID swap won't catch.
4 min read
Latest
Everything we've published, newest first.
A PreToolUse hook is the guardrail that survives bypass mode
Permission prompts depend on what mode you're in. A PreToolUse deny hook doesn't. Here's a small one that blocks force pushes, and where it falls short.
3 min read
A separate evaluator agent is what makes long agent runs worth the money
Anthropic's harness splits planning, building and testing across agents. The cost jump was 20x, and the reasons it paid off are specific.
3 min read
Google's Agent Development Kit hits 1.0 for Kotlin, with Android support
Compile-time tool schemas, human-in-the-loop flows and resumable sessions, for teams that build agents in Kotlin.
2 min read
Cursor Projects puts a coordinator agent in charge of the work
The agent that plans and delegates never writes the code. Cursor says it can keep a project's context for months.
3 min read
Build a Claude Code subagent that reviews your diff with fresh eyes
A reviewer that never saw the code being written catches different things. Here's the file, the invocation and the over-reporting trap.
3 min read
What 16 parallel agents building a C compiler teach about running agents at scale
Anthropic's engineering team spent nearly $20,000 on it. The lessons about tests, locks and duplicate code transfer to much smaller jobs.
3 min read
Run Codex from a script: codex exec, structured output and CI
The non-interactive mode turns Codex into a pipeline step. The defaults are conservative, and one warning matters a lot.
3 min read
Let the agent interview you, then write the spec, then start fresh
A three-step workflow for features too big for one prompt, and what makes a spec worth handing over.
3 min read
That 2-point benchmark lead might just be a bigger server
Anthropic measured how much infrastructure settings move agentic coding scores. It's more than many leaderboard gaps.
3 min read
Claude Code's auto mode catches most risky actions. Anthropic's numbers show what it misses
A 0.4% false positive rate sounds great. The 17% miss rate on real overeager actions is the number to plan around.
3 min read
You can now ask Copilot for a code review from a script
GitHub's REST and GraphQL APIs can request a Copilot review, and the default review depth just changed.
3 min read
Claude Opus 5.5 costs 20% less per token and Anthropic says it codes better
The numbers behind the release, what changes in practice, and why Anthropic's own benchmark caveat is worth reading.
3 min read
Run parallel Claude Code sessions without them stepping on each other
The --worktree flag gives each session its own checkout and branch. The setup details are where people get caught.
3 min read
Copilot CLI dynamic workflows: turn a repeatable chore into code with agents inside
A public preview feature that lets code run the steps and agents handle the judgment calls. Here's how to try it.
3 min read
Cursor's Security Review bot reads your pull requests for exploitable bugs
It posts one comment per PR, skips drafts, and takes your own security rules. What's missing is any accuracy data.
3 min read
Your CLAUDE.md is probably too long. Here's how to cut it
Anthropic's own advice is to prune ruthlessly. A one-question test, a before and after, and where each deleted rule should go instead.
3 min read
How Codex reads AGENTS.md, and how to layer it so the right rules win
Global defaults, repo rules and per-service overrides stack in a fixed order. Know it, and a monorepo stops fighting your instructions.
3 min read
Stop telling your AI agent to 'fix the bug'. Make it reproduce it first
A bug prompt in three parts, and a rule for when to throw the whole session away.
4 min read
Make Claude Code run your tests before it's allowed to say it's done
A Stop hook turns 'please run the tests' from a request into a rule. Here's a working setup and the trap to avoid.
3 min read
Google Cloud API Gateway can now serve your REST API as MCP tools
Annotate an OpenAPI spec, redeploy, and agents get tools without a separate MCP server to run.
3 min read
Cursor's Rollouts bot watches your deploys after the merge
Most AI tooling stops at the pull request. This one keeps going until the change is live in each environment.
3 min read