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## Why World State restores its structured snapshot on resume so unchanged sections do not have to be rendered again. That is safe only when the model-visible fragment represented by the snapshot is still present in retained history. For selected executor skills, the failing selected-capability scenario exposed this state: ```text persisted World State: selected skill catalog is known retained model history: selected skill catalog message is missing next diff: unchanged, so emit nothing ``` The model resumes without being told about the selected skill catalog. ## What changed World State contributions may now optionally describe the concrete model-visible fragment that must remain in retained history. When a persisted snapshot is present: ```text matching retained fragment exists -> trust snapshot, emit nothing matching retained fragment missing -> treat section as absent, render current state once ``` The skills extension uses this for non-empty selected-environment catalogs by matching its exact rendered catalog body. Empty or hidden catalogs do not require a fragment. ## Scope This does not clear or rebuild the whole World State baseline. It does not change skill discovery, cache invalidation, environment availability, or MCP runtime behavior. It only keeps a persisted section snapshot and its retained model context consistent across resume/history reconstruction. ## Coverage A focused World State regression test verifies both sides: - a missing retained fragment is rendered again - a matching retained fragment avoids duplicate injection
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