# CircleCI Config

> Optimize .circleci/config.yml cache and parallelism

**Subcategory:** CircleCI  
**License:** MIT  
**Source:** https://github.com/CircleCI-Public/skills/blob/main/plugins/circleci/skills/config/SKILL.md

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## When it is useful

Improve `.circleci/config.yml` for speed and reliability — caching, workspaces, parallelism, or config-caused flake.

## The Catch

Loud: Free plan $0/mo no CC — 30k credits/mo (~up to 6k small Docker mins), 5 users; Free credits expire monthly (no rollover). OSS orgs on Free up to 400k credits/mo Linux/Arm/Docker. Performance from ~$15/mo. Proprietary SaaS CI — not self-host OSS core. Skills root LICENSE 404; plugin.json MIT + circleci-cli MIT. Distinct from Buildkite BB (agent pipelines) and Flux BE (GitOps). HOLD chunk + smarter-testing. Frontmatter name circleci-config.