// edition · 2026-04-08

April 08, 2026

32 stories on AI dev tools, agents, and the coding stack — curated from the day's RSS haul by Agentic Dev's pipeline.

Top Signal · Workflows & Tips

Claude API with tool use: build agents that call real functions

Anthropic's Claude API tool use feature works by having Claude return JSON specifying which functions to call and with what arguments, rather than calling functions directly; users execute these functions and return results to Claude in an iterative loop.

Dev.to - Claude

Tool Updates

Building MCP servers that don't get hacked: 22 security checks every developer needs

An audit of 50 open-source MCP servers found 43% contained command injection vulnerabilities. The article outlines 22 security checks to prevent attacks, including avoiding shell string interpolation, eval/exec usage, and path traversal in servers that mediate between language models and producti...

Agent Engineering Dev.to - Claude

We Gave Our 4 AI Lobsters the World's Smartest Brain — For Free

A developer replaced their four AI agents' local model with Claude Opus accessed through a proxy wrapper, upgrading output quality while saving approximately $450/month in API costs through an existing Claude Max subscription at 200K tokens/day usage.

Workflows & Tips Dev.to - Claude

I built a $2/month Claude API — here's the curl command

A developer launched SimplyLouie, a Claude API-compatible endpoint priced at $2/month flat rate, as an alternative to per-token billing models. The service uses Anthropic's official ANTHROPIC_BASE_URL mechanism to route API calls.

Workflows & Tips Dev.to - Claude

Manage Vercel Microfrontends with AI Agents and the CLI

Vercel added an AI skill for coding agents and new CLI commands to manage Microfrontends, allowing users to create and manage microfrontend groups through natural language prompts or terminal commands without using the dashboard.

Workflows & Tips Vercel Blog

The Face Never Existed. The ID Is Stolen. The Match Is Perfect.

Hybrid identity fraud using AI-generated faces is compromising biometric verification systems by creating synthetic IDs and liveness videos that match too perfectly, forcing developers to shift from simple facial matching to forensic analysis that detects shared synthetic origins through mathemat...

Agent Engineering Dev.to - AI

Query and visualize workflow data in Vercel Observability

Vercel added a query builder to Observability Plus that lets Pro and Enterprise teams create custom queries on workflow runs and steps, with filtering and grouping by environment, project, workflow, and step.

Workflows & Tips Vercel Blog

Ecosystem

System Card: Claude Mythos Preview [pdf]

Anthropic released a system card for Claude Mythos Preview, a new model variant, documenting its capabilities and characteristics.

Model Releases Hacker News - Best

The First Real Counterattack

Anthropic launched Project Glasswing and Claude Mythos Preview, an AI model that discovered zero-day vulnerabilities in OpenBSD, FFmpeg, Linux, and browsers that human audits and automated fuzzers missed for years. The company chose not to release the model publicly due to cybersecurity risks.

Industry & Funding Dev.to - Claude

GLM-5.1: Towards Long-Horizon Tasks

Z.ai released GLM-5.1, a 754-billion-parameter open-source AI model available under MIT license. The model demonstrated the ability to generate SVG graphics with CSS animations and to debug and fix code issues when given follow-up instructions.

Model Releases Simon Willison

GLM 5.1 on AI Gateway

Z.ai's GLM 5.1 model is now available on Vercel's AI Gateway, supporting long-horizon autonomous tasks including multi-step coding workflows, conversation, creative writing, and document generation.

Model Releases Vercel Blog

Opus 4.6 Fast Mode available on AI Gateway

Vercel made Fast Mode available for Claude Opus 4.6 on AI Gateway, offering 2.5x faster output token speeds at 6x standard pricing. The experimental feature is designed for human-in-the-loop workflows and coding tasks.

Model Releases Vercel Blog

Your article is well-written. But is it yours?

An engineer argues that while AI can help polish technical writing, relying on it to generate content about unfamiliar topics produces superficially well-written but substantively empty work. Authentic technical writing requires personal experience and context from real debugging and production i...

Opinion & Analysis Dev.to - AI

The Trade-Off Between Safety and Creativity in Claude

Anthropic designed Claude using constitutional AI principles prioritizing safety over capability, resulting in a system that refuses requests more frequently and produces more conservative outputs. The approach creates a trade-off where increased safety constraints limit creative tasks like story...

Opinion & Analysis Dev.to - Claude

Anthropic’s Claude Mythos is now available, but not for you

Anthropic released Claude Mythos Preview, a new frontier AI model, to about 50 select partners including Amazon, Apple, and Microsoft through Project Glasswing for defensive cybersecurity work. The model scores 83.1% on vulnerability analysis benchmarks, compared to 66.6% for the previous flagshi...

Model Releases The New Stack

SQLite WAL Mode Across Docker Containers Sharing a Volume

Simon Willison's research confirms that SQLite WAL mode functions correctly across separate Docker containers sharing the same volume, as containers on the same host share the same shared memory required for WAL coordination.

Open Source Tools Simon Willison

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