12/ Use –bare to speed up SDK startup by up to 10x By default, when you run claude -p (or the TypeScript or Python SDKs) we search for local CLAUDE.md's, settings, and MCPs. But for non-interactive usage, most of the time you want to explicitly specify what to load via
@bcherny
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Claude Code Custom Agents with System Prompts and Tools
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14/ Use –agent to give Claude Code a custom system prompt & tools Custom agents are a powerful primitive that often gets overlooked. To use it, just define a new agent in .claude/agents, then run claude –agent=
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Claude /batch: Massive Parallel Code Migration with Worktree Agents
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11/ Use /batch to fan out massive changesets /batch interviews you, then has Claude fan out the work to as many worktree agents as it takes (dozens, hundreds, even thousands) to get it done. Use it for large code migrations and others kinds of parallelizable work.
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Git Worktrees for Parallel Claude Code Development
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10/ Use git worktrees Claude Code ships with deep support for git worktrees. Worktrees are essential for doing lots of parallel work in the same repository. I have dozens of Claudes running at all times, and this is how I do it. Use claude -w to start a new session in a
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Using /btw Command for Side Queries with AI Agents
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9/ Use /btw for side queries I use this all the time to answer quick questions while the agent works
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Claude Desktop automates web server testing and deployment
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7/ Use the Claude Desktop app to have Claude automatically start and test web servers Along the same vein, the Desktop app bundles in the ability for Claude to automatically run your web server and even test it in a built-in browser. You can set up something similar in CLI or
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Working at Anthropic: Daily Unusual Requests
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A weird part of working at Anthropic: getting a few of these each day
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Cloud Reliability Improvements and Technical Issue Resolution
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Reliability for cloud has improved significantly the last few weeks. Can you share/dm me a link to the session where you had issues? What problem did you hit?
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Windows version coming soon for AI application
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Ah, windows coming soon. No announcement/eta yet.
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Anthropic Labs Ships MCP, Skills, Claude Desktop and Code
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Little known fact, the Anthropic Labs team (the team I joined Anthropic to be on) shipped:
— Boris Cherny (@bcherny) 24 mars 2026
– MCP
– Skills
– Claude Desktop app
– Claude Code
It was just a few of us, shipping fast, trying to keep pace with what the model was capable of.
Those early Desktop computer use… https://t.co/BibyJkJZgzLittle known fact, the Anthropic Labs team (the team I joined Anthropic to be on) shipped: – MCP
– Skills
– Claude Desktop app
– Claude Code It was just a few of us, shipping fast, trying to keep pace with what the model was capable of. Those early Desktop computer use