Developer lets Claude Code AI agent autonomously attempt to build a business from scratch

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A developer gave Claude Code, an AI coding agent, a single open-ended instruction: start with no money and figure out how to generate revenue. Before writing any code, the agent independently conducted market research by analyzing freelance platform trends and exploring browser extension opportunities. During the process, it unexpectedly discovered real leaked database credentials and authentication tokens in a local project on the developer's own machine. The agent also attempted autonomous distribution by trying to register on Hacker News to promote the resulting tool, revealing an unanticipated failure mode around AI-driven self-promotion. The experiment produced a free, MIT-licensed security scanning tool called agent-audit, now publicly available on GitHub, along with reusable automation infrastructure the developer plans to apply to future projects.

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Student Builds C++ and Qt Banking System with Client-Server Architecture

A student developer created a banking system project using C++ and the Qt framework, split into a separate client GUI and server application. The client was built with QML, handling user inputs as signals sent to the server, while the server ran as a command-line interface. A JSON-based database was used to store data, with Qt's built-in JSON library managing file operations. The project featured two access levels — a standard user and an admin — with the admin class inheriting from the user class and receiving additional permissions. TCP socket communication between the two applications proved the most challenging part, with the developer relying on Claude AI to help implement the networking logic.

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ProgrammingDEV Community ·

Developer cuts AI agent telemetry by 81% by eliminating redundant file echoes

A developer auditing their AI coding agent's telemetry discovered that 81% of stored data was redundant, with two-thirds of the largest rows being full copies of files already stored in version control. The agent's Edit and Write tools were logging entire edited files as tool responses, consuming 35.1 MB per week while carrying no unique information. After measuring actual data consumers and splitting telemetry by tool type, the developer devised a rule to retain only responses that contain information not available elsewhere. Implementing this change reduced per-row storage from 4,119 bytes to 2,326 bytes, with Edit tool response data dropping 92% per row. The exercise highlighted that aggregate metrics only signal a problem exists, while breaking data down by category reveals what to actually fix.

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ProgrammingDEV Community ·

Fable 5.1 cuts cache costs 75% but thinking-heavy tasks cost 20% more

AI model Fable 5.1 launched with a significant reduction in cache read pricing, dropping from $1.00 to $0.25 per million tokens, while input and output prices remained unchanged at $10 and $50 per million tokens respectively. The developer behind the analysis found that the cost impact depends heavily on workload type: agentic sessions with repeated context re-reads can see bills drop by up to 45%, while high-effort single-shot tasks cost significantly more. Independent benchmarking firm Artificial Analysis recorded a 20% cost increase per task over Fable 5, measuring at max effort settings where the cache savings are less impactful. A separate test by researcher Simon Willison showed that running the same prompt at maximum versus low effort could cost 33 times more, highlighting how the model's effort dial drives costs far more than token pricing. Subscription users on the Pro plan also faced surprise charges, as Fable 5.1 falls outside standard usage limits and runs on pay-as-you-go credits with no introductory credit offered at launch.

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ProgrammingDEV Community ·

Free PowerShell Script Checks Windows Laptop Battery Health in Seconds

A developer named NSTechBytes has released BatteryHealth, a free, open-source PowerShell script that checks laptop battery health on Windows 10 and 11. The lightweight tool works by invoking Windows' built-in powercfg command to generate an official battery report, then parses the HTML output to extract key metrics. It displays the battery health percentage, cycle count, and estimated runtime with color-coded results indicating healthy, fair, or degraded status. The script requires no third-party software and runs in approximately 150 lines of commented code under an MIT license. It is available for free on GitHub and is aimed at everyday users, IT administrators, and anyone evaluating a used laptop.

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