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See: /MRS-Specification-RFC#14-mime-types-and-file-extensions

MIME Types

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

File Extensions

FormatExtension
MRS-S.mrs or .mrs-s
Working Set Envelope.mrs-work (typically ephemeral)
Note: Working Set Envelopes are typically not persisted to files—they exist as in-memory structures passed between orchestrator and agents.

Encoding

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