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Postbag is a local MCP server that lets Claude Code and Codex ask each other for code reviews

Both sessions join a named "bag" in the same repo, and a review request or reply lands in the other agent as a new turn through its own input, with no daemon, polling, or hooks and one shared local log. The MIT server needs Python 3.10+ and a Codex CLI with codex queue, installs with pipx install 'postbag[mcp]', and is tested on macOS.

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Sakana AI's MASS has one model design, run, and judge its own agent teams, then train on the best runs

A single shared model plays executor, workflow optimizer, and evaluator, searches for better multi agent workflows, and fine tunes on executions of the team it judged best. After two cycles with Qwen3.6 27B, score per output token reached 1.2 to 1.6x the base model on four research benchmarks, and the authors found the optimizer, not the evaluator, was the bottleneck; paper and code are open…

Sakana AI

Claude Code Mode plugin lets Claude write one sandboxed JS program to chain your MCP tools

Instead of calling MCP tools one by one and dumping every full result into context, the model writes a single JavaScript program that calls the tools, filters and joins the output in an isolated Node process, and returns only the final answer. It needs Node.js 22.13+, keeps normal MCP permission checks, and installs with /plugin marketplace add gabe4coding/claude code mode…

Karpathy: the gap in how people understand LLM capability is now a sharp funnel, and it's widening

By his napkin math, about 6B people have barely touched LLMs, 1 to 2B use free tier chatbots, roughly 20M see agents finish weeks long math and code projects from a prompt, and about 5,000 inside labs see swarms of agents working for weeks. He blames scale of ambition, capability peaking in verifiable domains like code, and access tiers, and warns that human review is starting to fall behind…

"Why are coding agents so dumb?": mtlynch argues the harness, not the model, is now the bottleneck

A daily OpenCode and Claude Code user says agents still run parallel subtasks one at a time, never hand gruntwork to cheaper models, write hard to read plans, stall overnight on trivial questions, and lack real OS level sandboxes. He lists table stakes he wants out of the box, including per task model routing, deterministic filesystem and network boundaries, and an AFK mode that decides after 30 minutes without a reply…

Harvard study of 718 firms: coding agents add 30% more code but no measurable rise in resolved issues

Using Jellyfish data on about 300 million work events, Fiona Chen and James Stratton find agent adoption raised lines, commits, and PRs by 20 to 30% while completed Jira issues and epics showed no statistically significant gain. They point to review as the bottleneck: PR submission to merge time rose 49% (3.45 days), change requests nearly doubled, and comments per PR rose 35%…

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