Topic · 82 stories
Coding agents
Stories
A Bank Built Its Own Coding Agent. It Took Off (Felipe Felisola Caso and Francesco Galletta (Monzo))
talk · Story page
Monzo's in-house agent started as an emoji you react with in Slack and now authors over 10% of all merged PRs across its tech teams at more than 1,800 tasks a day, on an MCP gateway into internal tools and a sandboxed orchestration system built for a regulated bank.
Rewriting Prime Agent in Rust (Prime Intellect)
Over 2,000 agents rewrote it from TypeScript in two weeks
v1.28.0 (OpenHands releases)
Executable known bugs, and in-chat secret requests
Do you let LLMs write both your tests and your code? (Lobsters)
community thread · Story page
One reviewer found the tests mostly restated the code
Today at work (Jesse Vincent)
blog post · Story page
An AI PM runs a blameless postmortem on an unprotected branch
pwasm 0.2a0 (Simon Willison)
blog post · Story page
42 commits into a vibe-coded Python WebAssembly engine
How VS Code Went from Monthly to Weekly Releases with AI (Harald Kirschner (Microsoft))
talk · Story page
A principal product manager on VS Code walks through the process changes behind the move from monthly to weekly releases.
AI Coding Agents Are Breaking Big Codebases (Dan Adler (Sourcegraph))
talk · Story page
Making and auditing one agent change across thousands of repositories
Customize Claude Code with mods in TypeScript (Claude Blog (claude.com))
blog post · Story page
Mods are small TypeScript functions that rewrite a prompt, draw new UI or replace a built-in feature, which hooks could never do. They run with the same access to your machine as Claude Code itself, they aren't sandboxed, and the post says to install them only from sources you trust.
GitHub Copilot can now interact with desktop apps with computer use (GitHub Changelog (Copilot))
blog post · Story page
Computer use is in public preview in Copilot CLI and the Copilot app on macOS and Windows, so Copilot can drive desktop applications on your behalf.
Evaluating AGENTS.md: Are Repository-Level Context Files Helpful for Coding Agents? (arXiv)
paper · Story page
On SWE-bench tasks and on issues from repositories that ship their own context files, providing one generally didn't raise task success and added over 20% to inference cost. Instructions got followed; the repository overviews providers recommend didn't help.
The Death of the Code Review: What the Data Actually Says (Laurie Voss (Arize AI))
talk · Story page
Developers using autonomous agents wrote 741% more code and shipped 30% more software. Voss's case is that review is the bottleneck: reviewer effectiveness collapses past about 400 lines, while agents open 10,000-line PRs.
Introducing Kiro workflows (Kiro (AWS))
blog post · Story page
Multiple agents on one task, with less supervision
Beyond the Model: Demystifying Harness Effects in Software Engineering Agents (arXiv)
paper · Story page
Which harness components help, by model and task type
Claude Code’s Next Era (Thariq Shihipar (Anthropic))
newsletter item · Story page
Mods, Plugins, Projects and Tag, from inside the team
Analyzing and Mitigating Cost-Inefficient Behaviors in Coding Agents (arXiv)
paper · Story page
Across 1,200 Claude Code and Mini-SWE-Agent trajectories on SWE-bench Verified, subsumed retrieval, similar script generation and test re-execution affect 79.00% to 98.00% of tasks and account for up to 22.75% of task cost. Structure-aware retrieval, the obvious fix, added overhead and raised costs by up to 28.14%.
Devin is now up to 40% more cost-efficient (Devin (Cognition))
blog post · Story page
Cognition reports 30-40% cheaper runs in Fusion and Normal modes
AI-Generated Code Is Already Competing With Human Code (Daksh Gupta (Greptile))
talk · Story page
Greptile compares agent-written and human-written pull requests on revert rates, flagged issue severity and review rounds.
Get Out of the Model's Way (Kevin Hou (Google DeepMind))
talk · Story page
Dynamic subagents, sidecar plugins and generated interfaces in Antigravity 2.0
Who Finishes the Job? A Study of Follow-Up Fixes and Commit Authorship on AI Coding Agent Pull Requests (arXiv)
paper · Story page
6,774 merged pull requests from Codex, Copilot, Devin, Cursor and Claude Code, followed into their later fixes against 5,044 human pull requests from the same repositories. The agent ones draw verified follow-up fixes at 1.62 times the odds.
Claude Code reads AGENTS.md only when telemetry is on [fixed] (Hacker News)
HN thread · 437 points on HN · Story page
A now-fixed bug tied to a telemetry flag
What a task costs on Opus 5.5 (Claude Blog)
Turns, retries, and what each token tradeoff costs
Faster C++ code intelligence with whole codebase indexing (GitHub Changelog (Copilot))
blog post · Story page
Whole-codebase indexing for C++ in Copilot CLI
Helix: The internal tool powering our Shopify app's native migration (Shopify Engineering)
blog post · Story page
Shopify built an internal tool called Helix to help LLMs rebuild the Shopify app in Swift and Kotlin, using small checkpoints and strict quality gates to keep the code shippable.
The bear can dance: Qwen 3.8 27B on one 3090 for 3 weeks (r/LocalLLaMA)
Reddit thread · Story page
One user reports running Qwen 3.8 27B for about 21 days on one RTX 3090 to build a CUDA inference engine, on roughly 12 human messages, getting working kernels that never beat llama.cpp. Compaction ate about 83 hours, and the same card had to host the agents and run the engine under test.
Quoting voxium (Simon Willison)
blog post · Story page
A team where every spec, ticket and report comes from Claude Code
Brownfield Agentic Engineering (Addy Osmani)
blog post · Story page
Running coding agents in a codebase older than the team
Not All Agents Are Equal: Code Quality and Post-Merge Maintenance Across Five Autonomous Coding Agents in the Wild (arXiv)
paper · Story page
Across 37,623 provenance-labeled pull requests from five commercial agents and a matched human baseline, revert rates split by vendor: 6.1% for Codex, 11.5% for humans, 14.5% for Devin. Pooled agent code carried fewer security smells.
Migrating the GitHub Copilot runtime to Rust, using Copilot (GitHub Blog (AI & ML))
blog post · Story page
GitHub used Copilot to port the Copilot agent runtime to 800,000 lines of production Rust, and says a rewrite this size wasn't affordable before agents.
Claude Code 2.1.274 (Claude Code Changelog)
blog post · Story page
This build warns you when memory use goes critical, adds CLAUDE_CODE_MCP_STARTUP_WAIT_MS to bound how long the first non-interactive turn waits for connecting MCP servers, and fixes sessions stuck retrying unexpected tool_use_id errors.
OpenHands v1.20.0 (OpenHands releases)
You can now select which secrets an agent profile may reach, point automations at a saved profile, and forward Docker conversation runtime settings.
Projects redesigned: from folder to conversation (Claude Blog)
Claude Code projects now scope and delegate their own parallel threads
OpenHands v1.19.0 (OpenHands releases)
Agent profiles scoped to specific MCP servers, plus GPT-6 Astra support
Plans They Abandon, Reports They Author: The Narrative Layer of Autonomous Agents (arXiv)
paper · Story page
Across 5,851 real developer sessions and 355,942 tool calls, a coding agent's self-report referred to about one action in eleven. The further execution diverged from the stated plan, the more the report resembled the plan.
Inside OpenAI’s agentic software factory (Pragmatic Engineer)
newsletter item · Story page
Inside how OpenAI runs Codex on its own codebase
Cline Desktop: An open-source app for open-weight models (Cline)
blog post · Story page
An open-source Mac app for open-weight coding models
commit-rewriter 0.1 (Simon Willison)
blog post · Story page
A web app for stripping agent clutter out of commit messages
Free Agent (Amp (Sourcegraph))
blog post · Story page
Amp drops the monthly plan: bring your own model keys or subscriptions and run agents on runners on your own machines for nothing. You pay for orbs, its remote machines, while inference bought through Amp carries no markup and BYOK limits go away outside Enterprise.
Steer, Don't Queue (Amp (Sourcegraph))
blog post · Story page
Amp now delivers a message you send mid-run at the next possible opportunity instead of holding it until the turn ends, so a correction lands before the agent runs verification you no longer want. Ship, Review and other built-in actions still queue.
I-have-ADHD: A skill to stop coding agents from burying the answer (Hacker News)
HN thread · 282 points on HN · Story page
A skill that makes coding agents put the answer first
Extending concurrent separation logic to the hardware level to verify the xv6 OS kernel on RISC-V with AI agents (Semantic Scholar)
paper · Story page
Agents help verify xv6 at the RISC-V hardware level, finding nine bugs
Announcing Mastra Factory Beta (Mastra)
Mastra open-sources the agent factory it says writes 25-35% of its PRs
I read 40k words of AI output a day. Here's how to stop reading most of it. (r/AI_Agents)
Reddit thread · Story page
One developer counted roughly 40k words of agent output a day and cut about a third with a CLAUDE.md or AGENTS.md block: changed files one line each, what you did not do and why, what I need to decide, max 150 words, no recaps. The author says the decisions line is the only part they read.
Cognition brings GPT-6 Astra to Devin, citing near-Fable 5 FrontierCode scores at 64% lower cost (@cognition)
X post · Story page
Cognition is bringing GPT-6 Astra to Devin, reporting Astra within 0.4 points of Fable 5 on FrontierCode 1.1 at 64% lower cost, plus a new best on its internal testing benchmark. Access starts with enterprise customers in OpenAI's Daybreak Program.
Anthropic Wants Claude Code to Run TypeScript Middleware Like Express (AlphaSignal)
newsletter item · Story page
Proposed Express-style TypeScript Function Hooks for Claude Code plugins
Rick Brewster: Claude wrote most of Paint.NET's clean-room Direct2D rewrite for WINE (Simon Willison)
blog post · Story page
Rick Brewster says Paint.NET runs on WINE because of a clean-room Direct2D rewrite Claude wrote, about 180,000 lines he says he can't possibly review next to the 700,000 in the rest of Paint.NET, which he's worked on for over 20 years. Most of it is vibe coded, he says, and he had to babysit resource management.
Claude can now use your computer in the background in Cowork and Claude Code (@claudeai)
X post · Story page
Anthropic says Claude can now operate your desktop from Cowork and Claude Code, clicking, typing, and opening apps while you work on something else. Per the thread it's in beta for Pro and Max plans in the macOS desktop app.
Maybe We Shouldn't Be Reviewing All This Code (Rachel Laycock (Martin Fowler))
blog post · Story page
Rachel Laycock on why code review is solving the wrong problems
Copilot code review can now approve pull requests (GitHub Changelog (Copilot))
blog post · Story page
Copilot code review can now tell you a pull request is ready to approve, and an admin can authorize it to sign off itself. The approval power ships off by default, so an agent-approved merge is an org-level choice rather than a surprise.
Fable 5.1 (Amp (Sourcegraph))
blog post · Story page
Amp swapped Fable 5 for Claude Fable 5.1 in ultra mode and says it costs less to run. Its examples are long unattended runs with proof attached: a typing-latency hunt that returned two hours later with a side-by-side video, and a thread-creation task it made 45% faster.
PRs NOT Welcome: How Top AI Open Source Projects Are Managing Thousands of Contributors (Latent Space)
newsletter item · Story page
Latent Space looks at how Vercel's AI SDK, Astro, Flue and tldraw are replacing drive-by community pull requests with software factories, where teams of agents apply fixes and features. It's an operating-model story more than a tooling one.
Devin adds Fable 5.1; Cognition says caching change makes it 54% cheaper (@cognition)
X post · Story page
Cognition put Fable 5.1 in Devin and says Fable-level intelligence is now 54% cheaper, because cached-token prices fell 4x and over 95% of the tokens in a coding task are cached. Its Fusion harness reportedly matches Fable 5.1 on FrontierCode at 47% lower cost.
Simon Willison publishes 'Understanding ChatGPT Work', his guide to OpenAI's confusing but powerful agent product (@simonw)
X post · Story page
Simon Willison published Understanding ChatGPT Work, a guide to a product he calls deeply confusing but extremely powerful, then had it build a page listing every tool in a Codex Work session.
You have to beat the models at something (Sean Goedecke)
blog post · Story page
Name the work you do that a model can't
Claude Code hits limits in just 1-2 hrs of work even on my MAX 200 plan (r/AI_Agents)
Reddit thread · Story page
One Max-plan user's account of burning limits within an hour
From Tokenmaxxing to Trusted Throughput (Mingsheng Hong (Ironclad))
talk · Story page
Merged pull requests weighted by complexity, not tokens burned
The Handoff Tax: Continuing Non-Native Trajectories in LLM Agents (arXiv)
paper · Story page
What escalating to a stronger model mid-trajectory costs you
A Few Pages of Markdown: Committed AI Configuration and Lower Quality Cost after Coding-Agent Adoption (arXiv)
paper · Story page
Committed AI config and complexity growth across 441 repositories
How Anthropic Builds: Lessons from Labs (Mike Krieger (Anthropic))
talk · Story page
Krieger on asking coding agents for unreasonably large jobs
Why Ramp built its own in-house coding agent, Inspect (Pragmatic Engineer)
newsletter item · Story page
The Pragmatic Engineer on why Ramp built its own coding agent, Inspect, rather than adopting a frontier lab's, and the case that the in-house system is now a step ahead. An in-depth build-versus-buy account from a real engineering org.
Fable & The End of the Free Lunch (Drew Breunig)
blog post · Story page
Drew Breunig argues Fable's release ended the free lunch of ever-better coding models at flat prices. With agentic coders balking and adopting alternatives, deciding where each kind of work runs is worth engineering time again.
Simon Willison: Fable 5 routed around a sandbox limit by writing its own CI workflow (@simonw)
X post · Story page
Experimenting with smolvm as a sandbox, Fable 5 found its environment had no /dev/kvm, so it wrote a GitHub Actions workflow to run the experiments and pushed it without asking first.
Cursor upgrades cloud agents: event-triggered work, persistent goals, long sessions (@cursor_ai)
X post · Story page
Cursor's cloud agents now pick up work from events, monitoring PRs, watching a Slack thread, or running on a schedule, and hold a goal until it's met via /goal. The changelog also adds subagents on isolated VMs.
Warp Factories Moves Coding Agents From Laptops to the Cloud (AlphaSignal)
newsletter item · Story page
Code-defined infrastructure for fleets of cloud coding agents
Vercel for Slack now in public beta (Vercel)
blog post · Story page
Vercel Agent joins Slack channels, read-only by default
The Working Set of a Coding Agent: Coherence Debt in Repository-Scale Tasks (arXiv)
paper · Story page
The paper models repository-scale coding as rebuilding a graph of coupled facts; facts covered by neither context nor parametric memory are coherence debt. Across seven models and five harnesses, availability decides the outcome, not distance from the edit, and passing harnesses differ more than tenfold in tokens.
Does a Language Server Save Tokens for Coding Agents? A Measurement Methodology and Preliminary Study (arXiv)
paper · Story page
A preliminary study of LSP against grep at equal task success, on Python and TypeScript repos with Claude Opus 4.8, Sonnet 4.6 and Haiku 4.5. On symbol localization the LSP cost 6% to 118% more tokens and the agent ignored it when free; on reference completeness it bought precision, not savings.
An Agentic Workflow for Legacy HPC Modernization: Converting the Two-Electron-Integral Core of GAMESS (Semantic Scholar)
paper · Story page
Three prompt-specialized Claude Code roles, in isolated worktrees, converted 56,448 lines across twelve files and 225 subroutines of GAMESS from Fortran 77 to Fortran 2008, working from a spec the agents wrote and revised. Humans held a few gates; an exact domain oracle marked where safe delegation ends.
Cursor launches Origin, its own code hosting platform (@cursor_ai)
X post · Story page
Cursor says Origin, its code hosting platform, is live in beta from today: you sync repos from GitHub, and Vercel, Buildkite and Depot integrations are available already, with more promised.
How to Kill the Code Review (Ankit Jain (Aviator))
talk · Story page
Capture the agent session as acceptance criteria when nobody reads diffs
Bot Settings: When to Trust / Review AI Agent Code (AlphaSignal)
newsletter item · Story page
Five trust settings for agent-authored pull requests
Zed Launches Delta to Replace Git Where AI Agents Write Code (AlphaSignal)
newsletter item · Story page
Zed's standalone Delta app puts agent coding sessions on a CRDT-based version-control layer: each session becomes a shared, reviewable, real-time multiplayer thread. The bet is that git wasn't built for how agents write code.
Claude in Chrome sessions now sync across desktop, web, and mobile (@claudeai)
X post · Story page
Claude in Chrome sessions now carry over to the desktop, web, and mobile apps, with skills and connectors working in the browser. On Max and Team today, rolling out to Pro in the coming weeks.
Grok 4.6 lands in Devin, ranked behind only Opus 5 and Fable 5 by Cognition (@cognition)
X post · Story page
Cognition put Grok 4.6 in Devin and, in its evaluation, ranks it ahead of GPT-5.6 Sol and behind only Opus 5 and Fable 5, citing thorough code exploration and root-cause analysis before changes.
Florian Herrengt on what teams lose when AI writes the fixes (Simon Willison)
blog post · Story page
What teams lose when no one understands the system
TDD inside the agent loop - theater or actual value? (Martin Fowler)
blog post · Story page
Birgitta Böckeler at Thoughtworks ran experiments on whether telling a coding agent to use TDD changes the outcome or only imitates a favored process.
Mendel Gödel Machine: Recursive Self-Improving Coding Agents via Comparative Evolution (arXiv)
paper · Story page
Self-rewriting coding agents with multi-task mutations and cross-lineage hybridization
Open-sourcing Metals v2: Databricks' Java and Scala language server for multi-million line codebases (Databricks)
blog post · Story page
Databricks open-sources its language server for huge Java and Scala codebases
MiniMax Code Gains Browser Control and Autonomous Goal Mode in v3.0.54 (AlphaSignal)
newsletter item · Story page
MiniMax Code adds browser automation and a long-horizon Goal Mode
Characterizing the Quality Profile of AI-Generated C++ in Production (arXiv)
paper · Story page
A year of line-level observability on AI-generated production C++
T3 Code nightly adds a "draft" feature for prepping threads (@theo)
X post · Story page
a draft feature for prepping threads
swyx: periodically delete your agent skills (@swyx)
X post · Story page
a reminder to prune accumulated agent skills
Issues that covered it
- Daily
Most of a harness-evolution gain is overfitting and extra compute
Plus: Monzo's 1,800 agent tasks a day, and a credential the agent thought was yours. 5 min.
Oct 22, 2026 · 5 min

- Daily
Claude Code's Bash tool changed 12% of calls carrying code or escapes
Plus: UndoBench, a Copilot CLI secret leak, and what Codemode is for. 5 min.
Oct 07, 2026 · 5 min

- Daily
Branch steering breaks the Dual-LLM guarantee for computer-use agents
Plus: swarms borrowing public URL scanners, pipelines that go wrong under replay. 5 min.
Oct 06, 2026 · 5 min

- Daily
VS Code rebuilt its release process around agents and now ships weekly
Plus: an agent that writes its own tools, and a support bot at 80%. 5 min.
Oct 05, 2026 · 5 min

- Daily
Six ways an agent harness can run something other than what you approved
Plus: elaborate harnesses lose to a plain coding agent. 5 min.
Oct 02, 2026 · 5 min

- Daily
A forged chat-template marker loses most of its authority as ordinary subwords
Plus: 5 papers, 3 builder posts, 9 quick links. 5 min.
Oct 01, 2026 · 5 min

- Daily
Agent context compression can cut tokens by two thirds and still run slower
Plus: a rescored injection benchmark, Letta's self-written workflows. 5 min.
Sep 30, 2026 · 5 min

- Daily
AISI finds GPT-6 Astra attacking out of scope during a cyber evaluation
Plus: five papers, METR's per-action monitor, and nine quick links. 5 min.
Sep 29, 2026 · 5 min

- Daily
Agent-written pull requests match human ones on revert rates, and fail differently
Plus: two papers pricing what agent context costs to serve and to keep. 5 min.
Sep 28, 2026 · 5 min

- Daily
Forged control tokens blank an agent's reasoning while the tool call still fires
Plus: a completion gate you can prove, and 8 tools where 83 were. 5 min.
Sep 25, 2026 · 5 min

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