Cesure

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Write, edit, transpose and play guitar tabs and staff notation in Cesure.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "Cesure": {
      "url": "https://api.cesure.app/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (14)

• create_score

  Create a score you write as a .cesure and open it as a draft, e.g. {"version":2,"score":{"title":"Song","tempo":96,"tracks":[{"name":"Guitar","instrument":"GUITAR","measures":[{"staves":[{"voices":["(0.6 2.5 2.4).2 r.2"]}]}]},{"name":"Bass","instrument":"BASS","tuning":[{"note":"G","octave":2},{"note":"D","octave":2},{"note":"A","octave":1},{"note":"E","octave":1}],"measures":[{"staves":[{"voices":["0.4.2 r.2"]}]}]}]}} (a track without tuning is a guitar in standard tuning; tuning lists the open strings from string 1). Every measure must read and fill its time signature, or nothing is created and the refusal names each fault with its place. Measure notation (.cesure): each voice is one string of beats separated by spaces. beat = content.duration[{d | tu 3}]; content = fret.string[{note props}] | pitch | (note note …) | r. Durations, on EVERY beat: 1 whole, 2 half, 4 quarter, 8, 16, 32, 64. Strings from 1 (the highest); x as fret mutes. A pitch (C4 = middle C, F#3, Bb2) lets Cesure choose string and fret; a staff is all by pitch or all fret.string. Beat props: d dotted, tu 3 triplet on each beat of the group. Note props: t tie, h hammer/pull-off and sl slide to the next note on that string, v vibrato, b (0 4) a whole-tone bend. EACH VOICE FILLS ITS TIME SIGNATURE EXACTLY: 4/4 = 4 quarters = 8 eighths, 3/4 = 3 quarters, 6/8 = 6 eighths; rests complete a short one. A measure without numerator/denominator is 4/4, whatever came before. A second voice (a bass under a melody) is a second string in voices. Examples (4/4): "5.3.4 7.3.4 r.2" (fret 5 then 7 on string 3 (strings from 1, the highest), quarters; a half rest); "(0.1 1.2 0.3).2 x.6.4 r.4" (a chord, a half; a muted note); "E4.8 F#4.8 G4.4 Bb3.2" (notes by pitch (C4 = middle C): Cesure chooses string and fret); "5.3.4{d} 5.3.8 2.1.8{tu 3} 3.1.8{tu 3} 5.1.8{tu 3} 7.2{h}.8 8.2.8" (dotted quarter; a triplet of eighths (each beat carries it); a hammer-on to the next note); "5.3.2 5.3{t}.4 7.2{sl}.8 9.2{v}.8" (a tie to the note before, a slide, a vibrato). A measure: {"id":"p2","numerator":3,"denominator":4,"staves":[{"voices":["0.1.8 2.1.8 3.1.4 5.1.4","0.6.2{d}"]}]}. The full format: https://cesure.app/format

  Parameters:

  • score (required) — string — The score, a .cesure written in the notation described above.

  Hints: read-only no · destructive no · idempotent no · open-world no

• import_score

  Open as a draft a score the person gives whole: a .cesure file's text, AlphaTex, or an "Open in Cesure" link. The score is taken as it is, never rewritten. A link to any other page (a video, a recording) opens nothing: Cesure reads no page.

  Parameters:

  • score (required) — string — The .cesure text, AlphaTex, or Open in Cesure link, verbatim.

  Hints: read-only no · destructive no · idempotent no · open-world no

• read_score read-only

  Read measures from..to of a track of the draft (all by default, 200 at most a call: past them, the answer's more says where to go on) as .cesure measures — id, time signature, voices in the compact notation (second voice, hands, ties included) — with the repeat signs and tempo changes of those measures, by id, a summary of the score and one of the track.

  Parameters:

  • draft (required) — string — The draft: the id a previous tool gave (draft).
  • to — integer — Last measure (default the last; at most 200 are read a call).
  • from — integer — First measure, from 1 (default 1).
  • track — integer — The track, from 1 (default 1).

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• edit_measures destructive

  Rewrite measures from..to (numbers, inclusive) of ONE track of the draft with .cesure measures, as read_score returns them; to = from - 1 inserts before from. A measure written with its id stays that measure, even rewritten; one written without its id is a new measure, and the one it stood for is removed with what it carried (a repeat it opened, say). A measure of the range left out is removed, and measures [] removes the whole range. The other tracks follow column by column, as in the editor: a column is inserted, removed or given a time signature on every track; its repeat signs are carried as the editor carries them, and a tempo change stays on its column (on the next one when its column is removed), so no other column changes tempo. A note may be written by its pitch (E4, Bb3) in place of fret.string: Cesure chooses its string and fret, and never moves a note written with its string. The answer names the measures written. A written measure that does not read or does not fill its time signature refuses the whole call, the refusal naming each fault with its place; a measure sent back unchanged (same id and content) is kept as it was. Measure notation (.cesure): each voice is one string of beats separated by spaces. beat = content.duration[{d | tu 3}]; content = fret.string[{note props}] | pitch | (note note …) | r. Durations, on EVERY beat: 1 whole, 2 half, 4 quarter, 8, 16, 32, 64. Strings from 1 (the highest); x as fret mutes. A pitch (C4 = middle C, F#3, Bb2) lets Cesure choose string and fret; a staff is all by pitch or all fret.string. Beat props: d dotted, tu 3 triplet on each beat of the group. Note props: t tie, h hammer/pull-off and sl slide to the next note on that string, v vibrato, b (0 4) a whole-tone bend. EACH VOICE FILLS ITS TIME SIGNATURE EXACTLY: 4/4 = 4 quarters = 8 eighths, 3/4 = 3 quarters, 6/8 = 6 eighths; rests complete a short one. A measure without numerator/denominator is 4/4, whatever came before. A second voice (a bass under a melody) is a second string in voices. Examples (4/4): "5.3.4 7.3.4 r.2" (fret 5 then 7 on string 3 (strings from 1, the highest), quarters; a half rest); "(0.1 1.2 0.3).2 x.6.4 r.4" (a chord, a half; a muted note); "E4.8 F#4.8 G4.4 Bb3.2" (notes by pitch (C4 = middle C): Cesure chooses string and fret); "5.3.4{d} 5.3.8 2.1.8{tu 3} 3.1.8{tu 3} 5.1.8{tu 3} 7.2{h}.8 8.2.8" (dotted quarter; a triplet of eighths (each beat carries it); a hammer-on to the next note); "5.3.2 5.3{t}.4 7.2{sl}.8 9.2{v}.8" (a tie to the note before, a slide, a vibrato). A measure: {"id":"p2","numerator":3,"denominator":4,"staves":[{"voices":["0.1.8 2.1.8 3.1.4 5.1.4","0.6.2{d}"]}]}. The full format: https://cesure.app/format

  Parameters:

  • draft (required) — string — The draft: the id a previous tool gave (draft).
  • from (required) — integer — First measure replaced, from 1.
  • to (required) — integer — Last measure replaced; from - 1 to insert.
  • measures (required) — array — The new measures, .cesure measure objects as read_score returns them; [] removes the range.
  • track — integer — The track, from 1 (default 1).

  Hints: read-only no · destructive yes · idempotent no · open-world no

• transpose destructive

  Shift the notes of the draft by some semitones; the placement follows, and no note keeps a wrong pitch. A note no string of its track carries at its shifted pitch goes where notesOffTheNeck says: retune_lowest_string tunes the lowest string of the track down to the lowest of those it carries (4 semitones at most), then moves the others by octaves; change_octave moves each by the octaves that put it on the neck. A harmonic that rings in its own form at no shifted string goes where harmonicsOffTheNeck says: keep_harmonic keeps it a harmonic at the octave that holds it, play_fretted plays it as a fretted note at its pitch, losing the harmonic's timbre. By default the lowest string when it carries the notes with no octave, else octaves, and harmonics kept when an octave holds them; play_fretted when no harmonic leaves the neck changes nothing. A choice that cannot place the notes is refused, saying why and naming the one that can. The answer names each string tuned down (retunedStrings: track, string, from, to) and counts the notes moved by octaves (notesMovedByOctaves) and the harmonics played fretted (harmonicsPlayedFretted).

  Parameters:

  • draft (required) — string — The draft: the id a previous tool gave (draft).
  • semitones (required) — integer — Semitones, -24 to 24.
  • notesOffTheNeck — string — retune_lowest_string or change_octave (default the first when it carries the notes with no octave).
  • harmonicsOffTheNeck — string — keep_harmonic or play_fretted (default the first when an octave holds the harmonic).

  Hints: read-only no · destructive yes · idempotent no · open-world no

• refinger destructive

  Place the notes of the draft again on the neck (string and fret), keeping their pitches: mode auto, standard (lowest frets) or optimized (fewest hand moves); searchCapo lets it choose a capo.

  Parameters:

  • draft (required) — string — The draft: the id a previous tool gave (draft).
  • mode — string — auto (default), standard or optimized.
  • track — integer — The track, from 1 (default every track).
  • searchCapo — boolean — Let the placement choose a capo (default false).

  Hints: read-only no · destructive yes · idempotent no · open-world no

• undo_last_change destructive

  Give the draft back the score it held before its last change (edit_measures, transpose, refinger, or an undo): the score it holds now becomes the one before, so calling it again redoes. One step only, and only when Cesure had room to keep that score; it says so when it had not.

  Parameters:

  • draft (required) — string — The draft: the id a previous tool gave (draft).

  Hints: read-only no · destructive yes · idempotent no · open-world no

• search_catalog read-only

  Search Cesure's catalog of free pieces by words of a title, a composer or both: a piece is found when each word is in one of them, a short joining word such as 'by' aside; returns title, artist, licence and link.

  Parameters:

  • query — string — Words of a title or a composer; empty lists the catalog.
  • language — string — en (default), fr or es.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• open_in_cesure read-only

  Show the draft in the Cesure player, to read and hear it. Where the host draws apps, the player plays the draft in the conversation; everywhere, the answer gives the short link that opens it in Cesure, with no account, and the score's summary.

  Parameters:

  • draft (required) — string — The draft: the id a previous tool gave (draft).

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• list_my_scores read-only

  The scores of the person's linked Cesure account ("My scores"), the most recently changed at the top, 200 a call (offset skips that many; when there are more, the answer's more gives the next offset): id, title, when last changed, and its tags; then every tag of the account, with how many scores carry it. Needs the account linked.

  Parameters:

  • offset — integer — How many scores to skip, most recent first (default 0): the answer's more gives the next.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• read_my_score

  Open one score of the linked account as a draft, by the id list_my_scores gives: the answer is the draft and the score's summary; read_score reads its measures. Needs the account linked.

  Parameters:

  • id (required) — string — The score's id, as list_my_scores gives it.

  Hints: read-only no · destructive no · idempotent no · open-world no

• save_new_score

  Save the draft as a NEW score in the linked account's library (never overwrites one; a free account keeps 3 scores), under a title (default the score's own). Needs the account linked.

  Parameters:

  • draft (required) — string — The draft: the id a previous tool gave (draft).
  • title — string — The title in the library (default the score's own).

  Hints: read-only no · destructive no · idempotent no · open-world no

• update_my_score destructive

  Write the draft back over the score of the linked account's library it was opened from (read_my_score), as saving in the app does: refused, nothing overwritten, when the score was saved in Cesure since. The library keeps the score's earlier version. Needs the account linked.

  Parameters:

  • draft (required) — string — The draft: the id a previous tool gave (draft).

  Hints: read-only no · destructive yes · idempotent no · open-world no

• organize_my_scores destructive

  Organize the scores of the linked account with tags, in ONE batch applied whole or not at all (at most 500 changes, counting the tags add creates): create_tags creates tags, add puts a tag on a score (creating the tag if the account has none of that name; names compare without case), remove takes it off, delete_unused_tags deletes tags no score carries. It never renames, deletes or changes a score, and no score's date moves. The opposite changes reverse an organizing (remove what add put, delete_unused_tags for the tags it created). Needs the account linked.

  Parameters:

  • add — array — Tags to put on scores.
  • remove — array — Tags to take off scores.
  • create_tags — array — Tags to create, by name.
  • delete_unused_tags — array — Tags to delete if no score carries them, by name.

  Hints: read-only no · destructive yes · idempotent yes · open-world no

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