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Add <runtime>/files/, a free-form store for operational values any work session can read: credentials, cluster names, usernames, API keys and tokens, endpoints, and other key-value meta a task needs to operate (a Playwright login, an authenticated API call, an ssh target). Created empty by mx init and backfilled by mx sync. mx only guarantees the directory exists and never reads, writes, or validates its contents, so the layout is the agent's to choose. It stays distinct from context/ (indexed knowledge) and from a work's own works/<work>/files/ (per-work artifacts), and it is local only (mx never commits or transmits it). core: runtimeFilesDir, created in initRuntime and backfilled in syncRuntime. tests: 3 new cases (107 total). docs: new Files store section in the runtime CLAUDE.md template and runtime-model, plus layout and init/sync updates across the docs and both READMEs. version 3.4.0 to 3.5.0.
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Summary
Adds /files/, a runtime-wide free-form store for operational values any work session can read: credentials, cluster names, usernames, API keys and tokens, endpoints, and other key-value meta a task needs to actually operate (a Playwright login, an authenticated API call, an ssh target).
It is created empty by mx init and backfilled by mx sync. mx only guarantees the directory exists and never reads, writes, or validates its contents, so the layout is the agent's to choose. It stays distinct from context/ (indexed knowledge, "how the system works") versus files/ (the raw values you plug in), and from a work's own works//files/ (per-work artifacts) versus the runtime store shared by every work. It is local only: mx never commits or transmits it.
Runtime stays v3, no migration. Existing runtimes get files/ on the next mx sync. typecheck, lint, tests (107), and build all pass.