Extend Take skill

Your Task

Input: $ARGUMENTS

Carry one take on through Suno's MCP server: build the continuation, show what it costs, get a go-ahead, send it, join each continuation into a whole song, log the whole songs, and hand off to listening.

You never choose a take, mark a keeper or set a track Final. The user listens and decides.

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Extend Take Skill

An extension keeps a take up to a point and generates what follows. Use it when the first part of a take is worth keeping: it stopped before the last chorus, its ending went wrong, or the song needs a verse it does not have. Suno returns only the new part; joining it to the old part is free.

Measured on a one-minute song: one call made two continuations for 10 song credits, and each joined, free, into its own whole song in the same voice. Carried on from the middle of a phrase, the join could be heard — so the point to carry on from is the end of a line. Background: ${CLAUDE_PLUGIN_ROOT}/reference/suno/mcp-api-mapping.md § Extending a Take.

Step 1: Resolve

Expected format: <album-name> <track> [take N] --at <m:ss | end> [--from "<section>"]

Find the album and track as /bitwize-music:generate does. Two things are needed; ask for whichever is missing.

• Where to carry on from — a time in the take, at the end of a sung line. end means the take's whole length, which keeps its last chord or fade in the middle of the longer song; to replace an ending, carry on from before it. If the user names a line instead of a time ("after 'there's a light to hold'"), ask Suno's listening agent, which is free: audio-listen(id: <the take's clip id>, question: "At what time, in seconds, does the line \"…\" end? End with a JSON block with the field line_ends_at_s."), then audio-listen-wait. Say the time back and let the user correct it; the agent can be off.
• What follows — a section of the track's Lyrics Box. The continuation is sent that section and everything after it. New words go into the Lyrics Box first, through /bitwize-music:lyric-writer, so they pass the same checks as the rest of the track; after that they are a section like any other.

Step 2: Check the Suno Server

Follow § Preflight in the reference doc: find audio-extensions-create, audio-full-song, audio-wait and account-usage, load their current definitions, and read account-usage. features lacks generate.extend → say the plan does not include extensions and stop. Not connected → say an extension needs Suno's MCP server and stop; on suno.com it is the song's Extend button.

Step 3: Build the Request

First run_pre_generation_gates(album_slug, track_slug): the continuation sings words from the Lyrics Box, and they may have changed since the take was made. A blocking gate stops an extension as it stops a generation; show the failed gates and stop.

Then get_extension_request(album_slug, track_slug, take: N, continue_at: "<time>", from_section: "<section>"). Leave take at 0 when the user named none: the tool picks the keeper, or the only take there is.

Result	Do
found: false	Report the error and stop
take_ambiguous	Ask which take, then call again with take
needs_continue_at, take_length_unknown	Ask for the time (Step 1)
section_not_found, section_ambiguous	Show sections and ask which
no_section_named (a warning)	Say Suno will write the words itself, show sections, and ask whether to name one
continue_from_end (a warning)	Say the take's ending stays in the middle of the song; ask whether to carry on from before it instead
Any other blocking problem	Show it and stop
voice is set	Find its id as /bitwize-music:generate Step 4 does and add it to the request as voice_id
A key in needs_grant while features lacks controls.advanced	Remove it from the request and say so in the summary

Step 4: Show the Summary and Get a Go-Ahead

READY TO EXTEND — [NN] [Title], take 2

  Keeps      take 2 up to 2:10 (of 2:31)
  Then       Verse 3 to the end of the Lyrics Box
  Style      the track's own, Variety Off
  Makes      2 continuations, each joined into a whole song (joining is free)
  Cost       about 10 song credits (20 with Max Mode). You have 9,853.
  After      open both whole songs (free) and check them.

Go ahead?   yes · without Max Mode · cancel

• credits in the tool's answer is the estimate. Name Max Mode when the request holds it; "without Max Mode" removes max_mode.
• Wait for an explicit yes. Silence is not a yes.

Step 5: Send It and Join

1. Fix an idempotency key before the first attempt: {album_slug}/{track_slug}/extend/{UTC timestamp}.
2. Call audio-extensions-create with the keys of request, the voice_id if there is one, and the idempotency_key. Add nothing: a duration would cap the new ending.
3. The answer carries two ids in clip_ids, one continuation each. Call audio-wait with both and until: "complete"; call it again while either is pending.
4. Join each one: audio-full-song(id: <continuation id>) with its own idempotency key (…/join-1/…, …/join-2/…). Each answer is a new song id; audio-wait for both. Suno's tool text says to join the one you want. Joining both is what lets the user compare whole songs, costs nothing, and was measured to work.
5. If the album has a workspace (request.workspace_id), file the two joined songs in it: workspaces-update-clips(id: <that id>, add: [<both joined ids>]). The continuations are filed already; a joined song is not.
6. Call account-usage again. Credits spent = balance before − balance after.

Failures are handled as in /bitwize-music:generate Step 6. If one join fails, say so and log the other whole song; audio-full-song may be asked again for the same continuation up to three times.

Step 6: Log and Hand Off

1. log_generation(album_slug, track_slug, <the track's model>, clips, notes: "<log_notes from the tool>, via MCP, N credits") with the two joined songs: their ids, status and length. The continuations alone are not logged — nobody keeps half a song.

2. Report:

   EXTENDED — [NN] [Title], take 2 from 2:10
   
     Take 5 (row 5)   3:40   https://suno.com/song/...
     Take 6 (row 6)   3:44   https://suno.com/song/...
   
     Spent 10 song credits. 9,843 left.
   

3. Continue into /bitwize-music:listen for the two new rows — tell the user to listen across the join, and give its time — then /bitwize-music:check-take for them, as /bitwize-music:generate Step 8 does.

The track's status does not change, and the original take stays in the log. If the user keeps an extended take, approval works as always (/bitwize-music:listen Step 7).

Remember

1. An extension is a generation: cost first, then a go-ahead, then one call.
2. Carry on from the end of a line. The middle of a phrase leaves a cut that can be heard.
3. The words come from the Lyrics Box, so they have been checked. New words are written there first.
4. Join both continuations and log the whole songs. Joining is free.
5. You never pick a take, mark a keeper or set Final.