Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/drvoss/everything-copilot-cli/github-codespaces-efficiencynpx skills add drvoss/everything-copilot-cli --skill github-codespaces-efficiencygit clone --depth 1 https://github.com/drvoss/everything-copilot-cliWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00037 | $0.01119 |
| Opus 5 | $0.00018 | $0.00560 |
| Sonnet 5 | $0.00007 | $0.00224 |
| Haiku 4.5 | $0.00004 | $0.00112 |
Grade A, and why
github-codespaces-efficiency scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.
GitHub Codespaces Efficiency
Audit GitHub Codespaces efficiency with a GitHub-native lens. Focus on devcontainer size, startup time, machine sizing, prebuild scope, and idle-time discipline without stripping away tools the team relies on every day.
Why This is Copilot-Exclusive
GitHub Codespaces is a GitHub-native development environment. This skill is most useful when
you can inspect repository configuration, correlate it with gh-based Codespaces metadata,
and turn the result into Copilot-driven GitHub workflow guidance.
When to Use
- Codespaces start too slowly or cost more than the team expects
.devcontainer/exists and needs trimming, right-sizing, or prebuild tuning- A team wants guidance on machine sizing, idle timeout, or prebuild scope
- The repository is onboarding Codespaces for the first time and needs a minimal baseline
When NOT to Use
| Instead of github-codespaces-efficiency | Use |
|---|---|
| Debugging a failing GitHub Actions run | actions-debugging |
| Reviewing PR lifecycle and checks | github-pr-workflow |
| General local development environment setup without Codespaces | ordinary repo setup guidance |
Prerequisites
- Access to
.devcontainer/when it exists ghCLI access if you want live Codespaces or machine data- Understanding of the team's baseline tooling requirements
Load Only What You Need
../../../references/github-codespaces-efficiency/codespaces.md- audit order, preferred fix order, safe-change rules, and reporting focus../../../references/github-codespaces-efficiency/review-rubric.md- compact rubric for review passes
If no .devcontainer/ exists yet, start with codespaces.md and define a minimal baseline
before optimizing.
Core Workflow
1. Measure first
Get-ChildItem .devcontainer -Recurse -File | Select-Object -ExpandProperty FullName
gh codespace list
$repo = gh repo view --json nameWithOwner --jq ".nameWithOwner"
gh api "/repos/$repo/codespaces/machines"
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 122 lines · 37 tokens per session scan A 4ad674f85de5
github-codespaces-efficiency is a skill published in the GitHub repository drvoss/everything-copilot-cli (45 stars, last pushed 5d ago), licensed MIT. It adds 37 tokens to every session and 1,119 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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