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mutl3y
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* fresh pull of updated stage with 2 skills and updated README only * adjusted skills after feedback and used skill analyser to review --------- Co-authored-by: Mark Heynes <mutl3y@heynes.biz>
51 lines
2.1 KiB
Markdown
51 lines
2.1 KiB
Markdown
# Codespaces and Devcontainer Efficiency
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Load this reference only when the task involves `.devcontainer/`, Codespaces sizing, prebuilds, or workspace cost.
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If the repo is onboarding Codespaces for the first time, define a minimal baseline first, then optimize.
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## Audit Order
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Inspect in this order:
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1. Check whether `.devcontainer/` exists.
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2. If it does not exist, gather baseline requirements first: language/toolchain, required CLIs, expected startup target, machine-size constraints, and whether prebuilds are needed.
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3. Review `.devcontainer/devcontainer.json`.
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4. Ensure `.devcontainer/devcontainer-lock.json` exists; if missing, recommend adding it because many repos predate lock-file support.
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5. Review related Dockerfiles, features, and setup scripts.
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6. Review docs that recommend machine sizes, prebuilds, or startup expectations.
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For new setups (step 2), start minimal and avoid optional tools until usage data justifies them.
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## Common Waste Sources
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- Oversized base images
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- Unnecessary packages or extensions
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- Slow post-create bootstrap steps
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- Prebuilds enabled for too many branches
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- Missing guidance on machine sizing or idle timeout discipline
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## Preferred Fix Order
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1. Remove unnecessary packages, features, and extensions
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2. Reduce startup commands and post-create installs
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3. Recommend the smallest machine size that preserves throughput
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4. Narrow prebuild scope to sustained-usage branches (default branch, active release branches, and any branch with more than five Codespaces per week)
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5. Add or tighten idle-timeout and cleanup guidance
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## Safe-Change Rules
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- Do not optimize startup by removing tools the team actually needs every day.
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- Distinguish repo changes from org or user settings.
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- Prefer documentation when the effective control lives outside the repo.
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- Avoid turning the devcontainer into a production-like image unless the team explicitly needs that.
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## Reporting Focus
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When reporting Codespaces improvements, separate:
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- Faster startup
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- Lower steady-state workspace cost
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- Lower prebuild spend
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- Guidance-only recommendations that still need org or user action
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