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See: /MRS-Specification-RFC#16-mime-types-and-file-extensions

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MIME Types

FormatMIME Type
MRS-Sapplication/vnd.mrs+sexpr
MRS-Opsapplication/vnd.mrs-ops+sexpr
Working Set Envelopeapplication/vnd.mrs-workset+sexpr

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File Extensions

FormatExtensionPersistence
MRS-S.mrs or .mrs-sPersisted (canonical storage)
MRS-Ops.mrs-opsTypically ephemeral
Working Set.mrs-worksetTypically ephemeral

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Persistence Notes

MRS-S is the only format intended for long-term storage. It represents the complete, archival-quality canonical state of a score. MRS-Ops and Working Set Envelopes exist as in-memory structures passed between orchestrator and agents. While they can be serialized for debugging or audit logs, they are not typically stored as files.

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Encoding

MRS documents MUST be encoded in UTF-8. The BOM (Byte Order Mark) SHOULD NOT be used.