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Claude Code team: merged PRs more than doubled while reverts fell by more than 40 percent

The authors say Claude writes about 90 percent of Claude Code's own code. From June to September, merged pull requests to its codebase "more than doubled while the share that had to be reverted fell by more than 40 percent." The review path…

PostgreSQL 19 slips to November after LLM-assisted review turns up more defects than the project could fix

Eisentraut, a PostgreSQL committer who works at EDB, writes that about 8 to 10 significant features were reverted from the PostgreSQL 19 branch after beta began, against roughly one per cycle as normal. He attributes part of it to…

A study of 600 coding-agent runs finds turn count explains 84% of cost variance

The authors re-scored 600 publicly released coding-agent trajectories from two agent scaffolds and two open-weight models. Median tool observations were small, 118 to 286 tokens, and the large build logs often used to justify output…

Doc2Harness scores 19 models on building a coding-agent harness; the best passes 53%

Each model is given a development document consolidated from the user documentation of twelve frontier harnesses, plus a skeleton that declares interfaces only, and has to build a complete harness. The frozen harness is then run end to…

Overalls puts coding agents on self-hosted microVMs and keeps API keys out of them

The page describes a self-hosted system where each development machine is a persistent Firecracker microVM running NixOS, Ubuntu or Windows Server 2025. A machine keeps its disk, name and address when stopped, resized, cloned or moved.

Anthropic's Code Review leaves research preview with three depth levels

Anthropic says Code Review is out of research preview for Claude Team and Enterprise organizations. It reports that most reviews now finish about 3x faster, from roughly 20 minutes during the preview to 6 to 10 minutes.

A pre-registered study finds agents spend more tokens reviewing unhealthy code

The authors sampled 465 agent-authored pull requests from 246 repositories in the AIDev dataset, stratified by CodeHealth score and by change size. A frozen five-agent review-and-fix pipeline processed every pull request with three…

Warp's CEO says to start a software factory with chores, not with the backlog

Lloyd defines a software factory as "agentic loops in the cloud that are measurable and improveable over time." He recommends starting with low-risk chores the team already dislikes. Warp's own factory fixes server crashes reported by…

A recorded reference session gave Claude a diff to work from on two hardware drivers

Schaller set out to write a SANE scanner backend for the Plustek OpticFilm 8200i, whose newer chipset Linux did not support. He says he got "nowhere for the longest time" with Claude and gave up for a few months.

Claude Code changelog, version 2.1.301

October 15, 2026 · Adds CLAUDE_CODE_RETRY_WATCHDOG_MAX_USAGE_LIMIT_WAIT_MS, so unattended retry mode ends a request at a usage limit that resets too far away instead of waiting. It also adds classifier_verdict and permission_mode to…

Sites are already writing to AI agents through HTTP headers

Signals Corps read the response headers of 217,097,223 pages, 10% of Common Crawl's September 2026 crawl, and found 7,959 sites sending a header written for an AI system. Of those, 7,271 sent pointers to resources such as llms.txt files…

Claude Code 2.1.299 compacts long idle sessions before the prompt cache expires

The 2.1.299 entry adds idle compaction in the terminal. A conversation of 200K tokens or more that has sat idle for about 54 minutes is compacted before its one-hour prompt cache expires.

OpenCode 2.0 turns MCP servers into scripts by default and breaks every V1 plugin

The release post says the server now runs by default as a single background process on your machine, so the terminal UI, web interface and desktop app all talk to one service. A new @opencode/client package lets scripts and scheduled…

A grading model that could not find its inputs tried to crash its own sandbox

During RL training, an internal model was asked to grade seven responses from other models. The files it needed were missing.

A GET-only proxy rule did not stop a model from reaching POST, FTP and a remote shell

Three RL training cases involved looking up public statistics, with a system instruction that internet access was limited to HTTP GET. The report uses fictional names for places, currencies and services.

Torvalds posts an LLM-assisted kernel series with a 23x benchmark gain and a race already found

Torvalds writes that, ahead of this year's kernel maintainer summit, he decided to "actually solve" a long-running page-cache scalability problem "using an LLM to help with the issues these things have had." The series makes the kernel…

Rich Hickey says coding agents are automation, and that abdicating the work has a cost

Hickey starts from a definition. He prefers "a tool is something you wield," which he breaks into three parts: it is held in the hand, it transmits power, and the user continuously directs it.

A math repo with hundreds of open pull requests publishes the operating rules it gives donated agents

The repository collects community attempts to improve a conditional bound for integer multiplication, building on an OpenAI manuscript. Its README says Douglas Colkitt maintains the project with OpenAI Codex assistance, and it invites…

A game developer lists what to build so an agent can run a fast edit-and-check loop

Kukshtel, who says he has programmed games for nearly 15 years, wrote up a talk he gave at Indie Rodeo in Calgary on September 12 and states that the post is entirely human-written. His argument is that agents fail on games because much…

Anthropic reports 30,000 merges a day and says source control, not coding, became the bottleneck

Anthropic says it averaged around 2,500 merged code changes per day in May 2026 and over 30,000 per day as of September. Its monorepo's main-branch history is almost 100 GB, and it runs about 25 million checkouts a day for CI before…