APC vs APX: Why Splitting Agent Memory by Visibility Matters

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A common failure in AI agent setups is treating all memory as a single bucket, rather than separating it by purpose and visibility. APC, the portable context layer, is designed to store only durable, project-wide facts — such as architectural decisions, team conventions, and stable constraints — in plain Markdown files that can be safely committed and reviewed. APX, the runtime and tooling layer, handles machine-local memory including owner preferences, session history, and temporary operational context that should not travel with the repository. The recommended workflow is to work within APX for ongoing sessions and local recall, then extract only sanitized, long-lived facts into APC. Judging memory by file type alone is a mistake; the deciding factor should be whether the information is safe, durable, and genuinely useful to future contributors.

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