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The read tool's isConcurrencySafe rationale called the fs/observed recorder "commutative" and said concurrent reads "converge to one observed version", overstating the guarantee: the WeakMap record is last-writer-wins. Safety comes from write/edit re-checking the version in their in-lock CAS (a stale observation only forces a later edit to fail closed with FS_STALE_VERSION), as the RFC already states. Align the read comment, the ToolDefinition JSDoc, both READMEs, and the regenerated catalogs.