# Source Registry

last_verified: 2026-09-26
review_scope: partial

**Scoped reviews: 2026-09-07 (provider surfaces, live) and 2026-09-26 (prompt-structure statements, mirror-read).** The date above covers the two reviews below, not a fresh verification of every historical source. Unlisted provider, pricing, client-installation, and policy claims retain their earlier verification dates and require rechecking before use. The older inventory is preserved for traceability.

`review_scope: partial` keeps the scheduled source-review warning active even while the review date is fresh. Mark it `full` only after the remaining inventory has been checked or explicitly retired; passing the metadata-age gate does not complete that work.

## Claims rechecked on 2026-09-07

| Source | Verified claim | Boundary |
|---|---|---|
| [ByteDance model page](https://seed.bytedance.com/en/seedance2_0) | Unified multimodal audio-video architecture; text, image, audio, video inputs. | Broad model framing, not an endpoint contract. |
| [ByteDance launch post](https://seed.bytedance.com/en/blog/seedance-2-0-official-launch) | Multimodal reference, editing, extension, and multi-shot examples. | Demonstrations do not establish a success rate or mandatory prompt parser. |
| [Model card v1, 2026-04-15](https://arxiv.org/abs/2604.14148) | Describes 4–15 seconds and native 480p/720p; reports developer evaluations. | Paper version is unchanged; retrieval date is not a new model release. Benchmark scores are not this skill's measured results. |
| [Runway creator help](https://help.runwayml.com/hc/en-us/articles/50488490233363-Creating-with-Seedance-2-0) | Lists 5–15 seconds and 480p/720p/1080p; 1080p requires Credits Mode. | Runway UI output options do not revise the model card's native-resolution statement or prove API/account access. |
| [Runway API model catalog](https://docs.dev.runwayml.com/guides/models/) | Lists `seedance2`, `seedance2_fast`, `seedance2_mini`, and separate `seedance2_5`. | A catalog entry proves documented naming, not entitlement. This package remains scoped to 2.0. |

**Incomplete retrieval:** the [BytePlus prompt-guide page](https://docs.byteplus.com/api/docs/ModelArk/2222480) exposed a title and August 31 update date but no guide body; the canonical page returned a server error in the browser. Its contents were not reverified. A changed page date alone cannot support new limits or syntax claims. No authenticated console, paid generation, pricing, or regional-access test was performed.

## Claims recorded on 2026-09-26 (mirror-read)

The first-party hosts `www.volcengine.com` and `docs.byteplus.com` were unreachable from the review environment, so these statements were read from hash-recorded third-party mirrors of the official PDFs and from ByteDance's own GitHub organisation. They carry the `volatile` label until the live pages are reread; `docs/EVIDENCE_NOTES_2026-09-26.md` holds the quotes and mirror locators.

| Source | Evidence label | Recorded claim | Boundary |
|---|---|---|---|
| Volcengine Seedance 2.0 prompt guide, document 82379/2222480 (mirror of the official PDF) | volatile | Multi-shot prompts use 镜头1 / 镜头2 / 镜头3 in event order with no forced per-shot duration; support for precise ranges such as 0–3 秒 is unstable; per-shot block order is camera or cut, action and expression, space change, audio; one camera move per shot; constraint sentences limited to subtitles, logo, watermark. | Official prompting advice, not a shot ceiling and not a guarantee that a numbered shot renders as a cut. Recheck the live page before quoting as current. |
| ByteDance Seedance 2.5 prompt guide, document 82379/2607689, dated 2026-08-07 (mirror of the official PDF) | volatile | Version difference: Seedance 2.0 responds to shot numbers, not timestamps; the newer line responds to integer-second timestamps, 30-second clips, and up to 50 reference assets. | Newer-line capabilities never transfer to this 2.0 skill; used here only to mark the boundary. Recheck the live page before quoting. |
| ByteDance `agentkit-samples` repository, `byted-ark-seedance-pe` references (official GitHub organisation) | volatile | Repeats the 2.0 timestamp warning; states the density rule (too little content for the duration and the model improvises; too many 分镜 for the duration and content and lines garble) with the split remedy. | Sample-repository guidance authored by the provider's support team, not an API contract. Recheck the repository before quoting. |
| Ark create-video-task document 82379/1520757 (mirror) | volatile | `duration` integer in 4–15 or -1 for model-chosen, default 5; `camera_fixed` not supported on the 2.0 series; prose echo 时长：X秒 with the Chinese 秒. | Request fields change by release; recheck before implementation. |

The machine-readable [source inventory](../data/sources.seedance-2026-05-30.json) updates only the records inspected in the 2026-09-07 pass; the 2026-09-26 mirror-read statements are recorded here and in the evidence notes, not in the inventory, because no live page was retrieved. Its filename and `generated_at` describe the original inventory; individual `retrieved_at` dates describe subsequent checks. The broader [API status snapshot](api-status.md) retains its August header and dated historical sections.

Use this registry before making factual claims about Seedance 2.0 platform behavior. Prefer primary public sources, attach a verification date, and mark volatile claims as recheck-required. This file is a claim-boundary map, not a guarantee of access on every product surface or region.

## Evidence Labels

| Label | Meaning | Required wording |
|---|---|---|
| `confirmed` | Directly visible in a primary public source at the verification date. | `Public sources state... as of [date].` |
| `volatile` | Likely to change by surface, account, region, pricing page, or model update. | `Recheck before giving numbers or promises.` |
| `field-observed` | Repeated creator/practitioner pattern but not official platform truth. | `Field observation, not guaranteed platform behavior.` |
| `unverified` | Plausible but not confirmed by a primary source. | `Requires testing or owner confirmation.` |
| `internal` | Repository guidance derived from this skill package. | `Use as workflow guidance, not external fact.` |

## Primary Source Hierarchy — historical inventory

Except for claims explicitly rechecked above, these entries retain their earlier dates (August 1 or the linked inventory record). `confirmed` means confirmed at that date, not continuously current.

| Topic | Preferred source | Evidence label | Verification note | Claim boundary |
|---|---|---|---|---|
| Core model capabilities | ByteDance Seedance 2.0 official page: https://seed.bytedance.com/en/seedance2_0 | confirmed | Recheck before release notes, API claims, or marketing copy. | Use for broad public capability framing only. |
| Launch capabilities and known limits | ByteDance Seedance 2.0 official launch post: https://seed.bytedance.com/en/blog/seedance-2-0-official-launch | confirmed | Recheck when discussing multimodal references, editing, audio, and platform examples. | Do not turn launch examples into guaranteed behavior on every surface. |
| Seedance 2.5 model-line boundary | ByteDance official model page: https://seed.bytedance.com/en/seedance2_5 and Dreamina official product page: https://dreamina.capcut.com/seedance/seedance-2-5 | confirmed model line; confirmed Dreamina surface | Historical model/Dreamina check: 2026-08-01. Runway catalog naming was checked separately on 2026-09-07 above; the exact launch date remains unconfirmed and account access remains unchecked. | The August review established a separate model line and that it was live on Dreamina. It does not authorize copying 2.5 capability numbers into this 2.0 skill. |
| Model card and paper | arXiv model card: https://arxiv.org/abs/2604.14148 | confirmed | Useful for model-family context and benchmark caveats. | Provider-authored paper; do not use as current commercial access proof. |
| API tutorial and platform docs | BytePlus ModelArk and Volcengine Ark docs: https://docs.byteplus.com/en/docs/ModelArk/2291680, https://docs.byteplus.com/en/docs/ModelArk/1520757, https://www.volcengine.com/docs/82379/1520757?lang=zh, and https://www.volcengine.com/docs/82379/2291680?lang=zh | volatile | Recheck endpoints, request fields, model IDs, task flow, and pricing before procedural API guidance. | API shape may differ by region, account, release channel, or trial gate. |
| Video generation task lifecycle | Volcengine video-generation tutorial: https://www.volcengine.com/docs/82379/2298881?lang=zh | volatile | Recheck create/query/list/cancel-delete flow, first/last-frame roles, return-last-frame, tools, and file-reference rules before implementation. | Official surface, but fields and account support can change. |
| Model IDs and pricing | Volcengine model list/pricing and BytePlus pricing pages, including https://docs.byteplus.com/en/docs/ModelArk/1544106 | volatile | Always recheck immediately before quoting numbers or IDs. Seedance 2.0 Mini IDs were source-visible on 2026-06-20, but access was still trial-gated through June 22 in official docs. | Volcengine prices may be cited only with date, currency, model, surface, and caveat; never infer BytePlus pricing from incomplete JS-rendered pages. |
| API-service ecosystem news | Volcengine developer article: https://developer.volcengine.com/articles/7628567056649125942 | volatile | Use as official ecosystem/news evidence for API-service rollout, safety standards, portrait authorization, virtual portraits, and BytePlus overseas-service statements. Recheck docs/console for implementation. | Not an API contract, price table, or entitlement guarantee. |
| BytePlus pricing pages | BytePlus ModelArk pricing docs: https://docs.byteplus.com/en/docs/ModelArk/1544106 and legacy docs such as https://docs.byteplus.com/en/docs/ModelArk/1099320 | volatile | Recheck live official pages or console before quoting Seedance 2.0 pricing, quotas, or model IDs. The earlier BytePlus snapshot recorded a `dreamina-seedance-2.0-mini` pricing row and no 1080p support for that row. | Some pages are JavaScript-rendered in static fetches; do not infer pricing from incomplete static content. |
| Prompting guide | Volcengine Seedance 2.0 prompt guide: https://www.volcengine.com/docs/82379/2222480?lang=zh | confirmed | Recheck when adding multimodal reference wording or prompt examples. | Prompting advice is official guidance, not a guarantee that every surface exposes every control. |
| First/last frame workflow | Volcengine tutorial and ComfyUI partner docs: https://www.volcengine.com/docs/82379/2298881?lang=zh and https://docs.comfy.org/zh/tutorials/partner-nodes/bytedance/seedance-2-0 | volatile | Volcengine documents first/last-frame roles; ComfyUI uses FLF2V workflow vocabulary. Recheck active surface before using exact fields. | The `FLF2V` label is surface-specific, but first/last-frame capability is documented on Volcengine. |
| Face, portrait, and voice behavior | Active product surface, official policy, and user authorization | volatile | Recheck current surface behavior and authorization context. | Do not infer consent from a file upload. |
| Runway Seedance 2 surface | Runway API and help docs: https://docs.dev.runwayml.com/guides/seedance/, https://docs.dev.runwayml.com/guides/models/, https://docs.dev.runwayml.com/api-details/api_changelog/, https://docs.dev.runwayml.com/assets/inputs/, and https://help.runwayml.com/hc/en-us/articles/50488490233363-Creating-with-Seedance-2-0 | volatile | Recheck duration, ratios, audio/reference combination rules, upload handling, region availability, plan requirements, and SDK support before production use. The Seedance-specific guide carries the most model-specific Runway examples; if a raw HTTP checker reports 404, verify through the browser/indexed doc before dropping it. | Official Runway surface, not a ByteDance/Volcengine API contract. |
| fal Seedance 2.0 surface | fal model/API pages: https://fal.ai/models/bytedance/seedance-2.0/text-to-video, https://fal.ai/models/bytedance/seedance-2.0/image-to-video, and https://fal.ai/models/bytedance/seedance-2.0/reference-to-video | volatile | Recheck endpoints, request fields, resolution tiers, duration, and per-second pricing before quoting numbers or writing API calls. | Official fal surface behavior, not Volcengine, BytePlus, or Runway behavior. Fast endpoints share the documented schema; multi-shot reliability downgrades on fast tiers are field-observed, not official. |
| Additional provider/router surfaces | Provider-owned pages and docs: https://evolink.ai/seedance-2-0, https://openrouter.ai/bytedance/seedance-2.0, https://kie.ai/seedance-2-0, https://piapi.ai/seedance-2-0, https://piapi.ai/docs/seedance-api/seedance-2, https://docs.laozhang.ai/en/api-capabilities/seedance2-video-generation, https://runware.ai/docs/models, https://modelslab.com/seedance-2, https://docs.aimlapi.com/api-references/video-models/bytedance/seedance-2.0, https://muapi.ai/, https://seegen.ai/, and https://www.segmind.com/models/seedance-2.0 | volatile | Recheck each provider page, API docs, endpoint base URL, model IDs, pricing, account access, moderation, face/reference schema, output URL lifetime, and rights terms before writing code or quoting numbers. | Third-party provider/router behavior only; not official ByteDance, Volcengine, BytePlus, Runway, or fal behavior. The repo endorses no host. |
| China-facing provider search | Official Chinese/product sources: https://seed.bytedance.com/zh/seedance2_0, https://www.volcengine.com/docs/82379/2291680?lang=zh, https://www.volcengine.com/docs/82379/1520757, https://jimeng.jianying.com/ai-tool/home, and ByteDance-owned Doubao/Jimeng/Jianying/CapCut surfaces; workflow or news examples include RunningHub workflows and business-partner reports | field-observed | Recheck current official Chinese docs and provider-owned pages before treating a Chinese-language result as a public API provider. | Do not list workflow hosts, blogs, or business-partner news as self-serve API surfaces unless they publish provider-owned API docs. |
| Agent Skills structure | OpenAI Codex Agent Skills docs: https://developers.openai.com/codex/skills, OpenAI Academy plugins/skills explainer: https://openai.com/academy/codex-plugins-and-skills/, OpenAI Codex Plugins docs, and Agent Skills open standard: https://agentskills.io/ | confirmed | Recheck before changing install guidance or root skill layout. | Packaging guidance, not Seedance platform capability. |
| Client skill discovery paths | Google Antigravity cross-product skills codelab: https://codelabs.developers.google.com/getting-started-with-antigravity-skills, Google Antigravity CLI plugins and skills reference: https://antigravity.google/docs/cli/plugins, and Hermes Agent skills docs: https://hermes-agent.nousresearch.com/docs/user-guide/features/skills | confirmed | Verified 2026-08-01 before correcting client install guidance. Recheck all three pages before changing paths or configuration. | Antigravity's codelab supports directory packages at `.agents/skills/` and `~/.gemini/config/skills/`; its CLI reference documents a different CLI-markdown path but does not prove package compatibility or dual scanning. Hermes uses `~/.hermes/skills/` as primary; other locations require `skills.external_dirs` in `~/.hermes/config.yaml`. |
| Runway MCP agent surface | Runway MCP announcement: https://runwayml.com/news/mcp | confirmed | Use for agent-surface availability only. | Does not change Seedance model capability; plan and connector access are Runway-specific. |
| Audio-video eval vocabulary | AVBench and VABench papers: https://arxiv.org/abs/2605.24652 and https://openaccess.thecvf.com/content/CVPR2026/papers/Hua_VABench_A_Comprehensive_Benchmark_for_Audio-Video_Generation_CVPR_2026_paper.pdf | field-observed | Use for eval dimensions such as audio-video sync and cross-modal consistency. | Benchmark framing, not product access or official Seedance performance proof. |
| Professional shot language | ASC camera-movement education and production shot-list practice: https://theasc.com/article/shot-craft-camera-movement/ and https://www.studiobinder.com/blog/shot-list-template-free-download/ | field-observed | Use for shot contracts, camera movement, and shot-list fields. | Industry workflow guidance, not Seedance capability proof. |
| Continuity practice | ScreenSkills script-supervisor role: https://www.screenskills.com/job-profiles/browse/film-and-tv-drama/technical/script-supervisor-film-and-tv-drama/ | field-observed | Use for continuity anchors such as wardrobe, props, eyeline, screen direction, and notes. | Role guidance, not platform behavior. |
| Color management and ACES | ACES docs and AMF specification: https://docs.acescentral.com/background/overview/ and https://docs.acescentral.com/amf/specification/ | confirmed | Use for color pipeline vocabulary and handoff metadata. | A prompt can describe a look; it cannot certify ACES compliance. |
| Aspect ratio and delivery containers | DCI, ISDCF, and buyer/platform specs: https://www.dcimovies.com/dci-specification/ and https://registry-page.isdcf.com/ | field-observed | Use for aspect-ratio/container separation and naming caution. | Always follow the contracted delivery spec. |
| Subtitles and captions | Netflix timed text, WebVTT, and accessibility rules: https://partnerhelp.netflixstudios.com/hc/en-us/articles/215758617-Timed-Text-Style-Guide-General-Requirements, https://w3c.github.io/webvtt/, and https://www.law.cornell.edu/cfr/text/47/79.1 | volatile | Use for subtitle/SDH/forced-narrative planning and caption-safe framing. Recheck buyer, language, region, and platform requirements. | Delivery requirements vary by buyer, language, region, and platform. |
| Audio loudness and post | ITU BS.1770, EBU R128, ATSC A/85, and buyer sound specs: https://www.itu.int/rec/R-REC-BS.1770, https://tech.ebu.ch/fr/publications/r128, https://www.atsc.org/atsc-documents/a85-techniques-for-establishing-and-maintaining-audio-loudness-for-digital-television/, and https://partnerhelp.netflixstudios.com/hc/en-us/articles/360001794307-Netflix-Sound-Mix-Specifications-Best-Practices-v1-6 | volatile | Use for stems, M&E, sync, loudness, and mix handoff language. Recheck the target buyer or platform spec. | Prompt audio is not a certified final mix. |
| Delivery and QC | SMPTE IMF, DPP specs, Netflix delivery specs, and MovieLabs OMC: https://www.smpte.org/standards/st2067, https://www.thedpp.com/specs/, https://partnerhelp.netflixstudios.com/hc/en-us/sections/10066414335891-Delivery-Specifications, and https://movielabs.com/ontology-for-media-creation/ | volatile | Use for delivery preflight and metadata/versioning guidance. Recheck contracted platform specs before final delivery. | Contracted platform specs override generic guidance. |
| Community practice | Douyin, Bilibili, CSDN, Reddit, Habr, creator notes, workflow screenshots | field-observed | Use only as practitioner guidance. | Mark as non-official; do not state as model guarantee. |
| Localized and mixed-language prompting | Japanese, Korean, Spanish, Russian, and multilingual community guides plus forum observations | field-observed | Recheck public pages before release; use for vocabulary and example structure only. | Code-mixing can clarify safe prompts, but never treat it as official filter behavior or safety evasion. |
| Community prompt corpora | YouMind/OpenLab, public prompt galleries, forum collections | field-observed | Mine structure, timing, vocabulary, and failure patterns only after safety classification. | Do not copy unsafe, IP-sensitive, or real-person prompts into active examples. |
| Repository guidance | README, SKILL.md, references, evals | internal | Keep aligned with source registry and API status. | Workflow guidance, not an external source of platform facts. |

## Required Claim Patterns

When answering platform-status questions, say: `As of 2026-06-20, public official sources describe Seedance 2.0 as supporting text, image, audio, and video inputs, including multimodal references for composition, camera language, motion rhythm, visual effects, and sound. Volcengine documents first/last-frame roles, Runway documents a Seedance 2 surface, fal documents text-to-video, image-to-video, and reference-to-video endpoints, and additional provider/router pages list Seedance 2.0 access, but access, pricing, model IDs, upload limits, regions, resolution, audio-combination rules, face/reference handling, and authorization behavior remain surface-specific and should be rechecked.`

When answering pricing, quota, upload-limit, model-ID, or regional-availability questions, do not guess. State that those values are volatile and require checking the current official surface.

When answering likeness, portrait, and voice questions, separate three things: technical surface support, rights/authorization, and prompt safety. Do not infer consent from a file upload.

When using community sources, say: `Field observation, not guaranteed platform behavior.`