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The Synopsis is a compressed structural view of the full score. It provides global context without full detail. See: /MRS-Specification-RFC#6-synopsis-format

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Characteristics

The Synopsis is:
  • Derived: Computed from full MRS-S
  • Read-only: Agents cannot modify it
  • Lossy by design: Context, not content

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Structure

(synopsis
  :hash "sha256:abc123..."
  :source-hash "sha256:def456..."
  
  :structure
    (movement 1 :title "Allegro" 
      :first-measure #uuid "018c3f40-0001-..." 
      :last-measure #uuid "018c3f40-0144-..."
      :display-range [1 324]
      :key C :mode minor)
  
  :parts
    (part violin-1 :section strings :range [G3 E7])
    (part clarinet-1 :section woodwinds :transposition (down M2))
  
  :harmonic-spine
    ((:measures #uuid "..." #uuid "..."
      :key Cm :function i :display-range [1 8])
     (:measures #uuid "..." #uuid "..."
      :key Eb :function III :display-range [9 16]))
  
  :thematic-regions
    ((theme-a 
      :first-appearance #uuid "..."
      :display-measure 1
      :parts [violin-1] 
      :recurrences [#uuid "..." #uuid "..."])
     (theme-b 
      :first-appearance #uuid "..."
      :parts [cello]))
  
  :density-profile
    ((:measures #uuid "..." #uuid "..."
      :avg-events-per-beat 2.3 
      :active-parts 4))
  
  :rehearsal-map
    ((A #uuid "..." :display 1)
     (B #uuid "..." :display 32)
     (C #uuid "..." :display 64)))

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Synopsis Fields

FieldDescription
:hashSHA-256 of the synopsis itself
:source-hashSHA-256 of the MRS-S it was derived from
:structureMovement/section boundaries
:partsPart summary (section, range, transposition)
:harmonic-spineChord progression and key areas
:thematic-regionsTheme appearances and recurrences
:density-profileTexture information by region
:rehearsal-mapRehearsal marks with UUID/measure mappings

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Access

Working Set Envelopes reference the synopsis by hash: 
(working-set
  ...
  :synopsis-ref "sha256:abc123...")
Agents can query the orchestrator: 
(query
  :type synopsis
  :ref "sha256:abc123..."
  :response (synopsis ...))