MATT NIGH'S BLOG
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Every essay, note, and external piece I've published. Filter by tag.
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Run multiple agents at once with /fleet in Copilot CLI
↗
APR 2026
ai
engineering
copilot
TL;DR ↗
/fleet dispatches multiple sub-agents simultaneously, with an orchestrator planning work decomposition and coordinating parallel execution
Well-structured prompts with specific deliverables and clear file boundaries enable effective parallelization
Sub-agents share a filesystem but lack direct communication — declaring dependencies and partitioning files prevents conflicts
Custom agents defined in .github/agents/ can be specialized for different tasks with different models and tool access
Fleet maximizes efficiency for multi-file refactors, documentation generation, and feature implementations spanning API, UI, and tests
How to write a great agents.md: Lessons from over 2,500 repositories
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NOV 2025
engineering
ai
copilot
TL;DR ↗
A great agents.md file is the key to getting useful output from AI coding agents
Analyzed over 2,500 repositories to find what makes instruction files effective
Successful files are specific about architecture, conventions, and testing expectations
Clarity and structure in your instructions directly correlates with agent output quality
Using GitHub Copilot to Write Blogs
FEB 2025
ai
copilot
prompts
TL;DR
Copilot can scan PRs, issues, and commits to generate blog ideas and outlines
Includes prompts for brainstorming angles, drafting full posts, and refining tone
Use Copilot to combine multiple PRs/issues into a cohesive narrative
Works for everything from deep technical dives to contributor shout-outs