Claude Code

An incident.io engineer asked Claude Code to diagnose slow API generation and implement improvements incrementally. The author reports an 18% runtime reduction, equivalent to 30 seconds, for approximately five minutes of personal work and $8 in Claude usage. Commands and workflow examples are included.

A KDDI Agile Development Center practitioner uses Claude Code with browser MCP tools to collect article links across four calendars and prepare Slack messages. The author reports a routine taking five minutes fell to 30 seconds and provides execution logs and setup commands.

Rakuten engineers use Claude Code for tests, components, bug fixes and documentation. Rakuten reports average feature delivery falling from 24 working days to five. A separate seven-hour vLLM implementation reached 99.9% numerical agreement with its reference, rather than general code correctness.

Doctolib runs Claude Code agents through GitHub Actions for implementation, review, documentation and production checks. Its updated case reports 25% shorter change lead time between January and September 2026. This is an internal operational measurement; causal attribution to Claude is the company's interpretation.

A READYFOR engineering survey documents Claude Code use for coding, Git operations and pull requests. Among 12 respondents, 66% reported saving one to two hours daily, while 42% reported more fatigue. These are self-reported savings rather than controlled productivity measurements.

incident.io's marketing chief used Claude Code to build PagerTron, a game with stored high scores, for a campaign aimed at Anthropic. The post links the campaign and shows the game. It documents a shipped marketing asset but provides no measured conversion or time-saving result.

Simon Willison used Claude to build a Python utility converting Claude Code sessions into navigable HTML. He publishes source code, example output and development transcripts. Codex handled a separate API reverse-engineering step. No quantified development-time saving is reported.

Novo Nordisk uses Claude in NovoScribe to draft clinical documentation from expert-approved text and study-specific variables. Claude Code helped build the platform. The company reports 90% less writing time for clinical study reports; human review and approval remain part of the process.

Ramp connects Claude Code to tools such as Datadog and Sentry through MCP to gather logs, errors and metrics for on-call engineers. Early observations suggested initial triage could take up to 80% less time. The source presents this as developing tooling, not an established measured saving.

Anthropic's legal team used Claude Code to prototype a phone-tree system directing colleagues to the appropriate lawyer. The example documents non-developers building an internal coordination tool. The article identifies it as a prototype and provides no quantified savings.

Australian developer Geoffrey Huntley ran Claude Code in repeated loops for three months to build Cursed, a programming language using Gen Z vocabulary. The compiler and demonstrations were published. This was a learning experiment with incomplete components, without measured labor savings.