A Composable Memory Stack Starts with Interface Contracts

A replaceable memory stack depends on explicit contracts for inputs, outputs, identity, provenance, access scope, scores, revisions, and failure behavior rather than merely separating storage, retrieval, ranking, and context assembly into different components. Systems should preserve score details, clarify whether updates replace or append records, define how deletions and derived-memory staleness are handled, and establish readiness behavior for asynchronously indexed writes so temporary unsearchability is not mistaken for missing information. Replacement should be tested through public interfaces using shared fixtures covering repeated writes, permission changes, deleted evidence, empty results, and provider failures, alongside comparisons of the evidence and answers produced by each implementation. Modularity should be introduced where credible future changes or ownership needs justify its operational cost, with rollback plans covering index versions and source mappings as well as package versions; managed services such as Supermemory should be evaluated by mapping their search results and failure cases to the application’s established contract.

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