Seedance Submitter

Use When

• Preparing, validating, submitting, polling, or debugging Seedance 2.0/2.5 jobs through PostPlus Cloud.

Do Not Use When

• Required inputs are missing and guessing would change the result.
• Task class, hook logic, storyboard, or reference policy is still unresolved. Use video-generation and video-request-architect first.

Execution Boundary

• This runner validates, submits, and polls normalized Seedance requests. It must not make creative strategy, task-classification, or reference-policy decisions.
• Interpret sd2 as Seedance 2.0 Mini (video-seedance-2-mini-*), the current default tier, unless the user names another model. Standard/fast remain available explicitly; use them when reference video/audio is required.
• Seedance 2.5 has four deliberately separate scene endpoints. Never convert one scene into another merely because an image is present:
  • video-seedance-2-5-text: prompt only; no media inputs.
  • video-seedance-2-5-first-frame: exactly one --first-frame; the output starts from that frame, so this is not a feature-only reference.
  • video-seedance-2-5-first-last-frame: exactly one --first-frame and one --last-frame; the provider contract fixes ratio to adaptive and duration to -1.
  • video-seedance-2-5-reference: one or more repeatable --reference-image, --reference-video, or --reference-audio; these guide features/style/content and are not opening or ending frames.
• For 2.0, standard/fast -text endpoints accept image/video/audio references; mini -text accepts images only. Every -image endpoint takes one --image first frame and no reference slots.
• Released endpoint keys and their option enums (resolution, aspect ratio, duration bounds) are discovered from postplus media schema --json; they are not hard-coded here.
• Set duration within the endpoint's published bounds (see schema). For edit targets that fall between viable values, pick the nearest valid duration and set targetEditDurationSeconds.
• When targetEditDurationSeconds < duration, include timeline.activePerformanceEndSeconds and timeline.tailStrategy.
• If the target script or beat plan exceeds the endpoint's maximum duration, split into independent submit-ready segments. Do not submit one oversized request.
• For 2.5 reference edit or extend, supply a reference video and use the exact schema constraints (aspect_ratio=adaptive, duration=-1). The CLI and Web boundary reject unsupported combinations before provider submission and billing.

Source And Request

• Lock media, script, duration, output root, source basis, and whether the user wants submission or commands only.
• promptPlan.*, timeline.*, and targetEditDurationSeconds are authoring vocabulary, not Seedance request fields. Submit with the endpoint's CLI flags from the flat provider contract discovered from postplus media schema --json (--prompt, legacy 2.0 --image, 2.5 --first-frame / --last-frame, --duration, --resolution, --aspect-ratio, --generate-audio, --output-format, --omni-reference-task-type, and the repeatable --reference-image / --reference-video / --reference-audio — reference flags only on the endpoints that publish those slots); the CLI rejects any flag outside the selected endpoint's contract. Compose the storyline/audio plan and any timeline.activePerformanceEndSeconds / timeline.tailStrategy instruction into the single --prompt narrative, then map the supported render bucket to --duration; timeline authoring fields have no separate flags or request fields, and there is no request-JSON envelope to author.
• Bind references explicitly: say what [image 1], [image 2], [audio 1], or [video 1] controls. Do not rely on same as previous, content above, or unbound local handles in final requests.
• Upload local reference media to hosted storage with postplus media-file upload --skill seedance-submitter --input-file <file> --mime <mime> --output <upload.json>, then pass output.mediaReference — a persistent postplus-media:// reference that never expires — into the Seedance media flags (for example --reference-image <output.mediaReference>). The hosted boundary exchanges it for a fresh signed URL at provider send time, so upload once and reuse the same reference across later submissions. output.data.download_url is a signed URL that expires; prefer output.mediaReference.
• Do not claim that uploading through PostPlus hosted storage automatically grants Moyu real-person exemption. Automatic Moyu asset-library escalation is enabled only for the enterprise Seedance 2.0 first_frame path with real end-to-end evidence. reference_image remained privacy-blocked in a recorded run after asset:// rewrite, and no paid Seedance 2.5 exemption smoke has been approved; both paths fail with the provider's typed policy boundary.

Review And Handoff

• Before submission, verify validation passed, every segment is self-contained, references are bound, required media exists, source basis is explicit, and the output path is durable.
• Seedance 2.5 support is contract-verified by official/live provider material and local submit/poll/result/billing mocks. Until an approved paid smoke checks the MP4, actual duration, resolution, audio track, and settlement, do not label those output properties artifact-proven.
• If a render is pending, return the segment id, manifest path, the output.data.id generation handle, the poll command postplus media poll --handle <output.data.id>, and expected local renders/ output path. The poll command waits in-command (re-checks every 8s for up to 45s per invocation; --wait-seconds 0 = single check): rerun the same command while the render stays pending instead of re-submitting or writing a tighter retry loop.
• Save a finished render to disk with postplus media-file download --url <fresh-output-url> --output-file <renders/...> (or --reference <postplus-media://...> for media that lives in hosted storage); provider output URLs are temporary, so download while fresh.

Stop Conditions

• Stop when required user intent, source evidence, or owned input artifacts are missing and guessing would change the result.
• If an owned CLI or script command fails, report the exact error and stop. Do not bypass the failure with metadata-only answers, readiness probing, local payload rewrites, fallback providers, or unpublished tools.

Public Command Boundary

• Choose the smallest matching command or workflow from the user input and run it directly.
• Readiness diagnostics: postplus doctor --skill seedance-submitter.
• Poll a pending render: postplus media poll --handle <output.data.id> (waits in-command up to 45s per invocation; rerun while pending).
• Use postplus media schema --json only when constructing or repairing an unknown request shape.
• Run the hosted submit with the generated command below; do not call provider APIs directly.

postplus media create video-seedance-2-fast-image \
  --prompt <prompt> \
  --image <image> \
  --output <result.json>

• If the CLI returns a quote-confirmation challenge, run postplus quote confirm --json --challenge-file <challenge.json> and retry with the returned token.